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TexasStooge
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#1141 Postby TexasStooge » Wed Apr 05, 2006 6:50 am
Code: Select all
MESOSCALE DISCUSSION 0429
NWS STORM PREDICTION CENTER NORMAN OK
0634 PM CDT TUE APR 04 2006
AREAS AFFECTED...CNTRL CA
CONCERNING...SEVERE THUNDERSTORM WATCH 149...
VALID 042334Z - 050030Z
...ISOLD SVR THREAT WILL CONTINUE EAST OF FRESNO/HANFORD THROUGH
02Z...
LATEST RADAR TRENDS ARE BEING MONITORED ACROSS CNTRL CA...WHERE WIND
FIELDS REMAIN EXTREMELY STRONG AHEAD OF APPROACHING TROUGH. STORMS
HAVE INCREASED OVER THE LAST HOUR OR SO...WHERE AIRMASS HAS BECOME
MARGINALLY UNSTABLE. TEMPERATURES AT 500MB ARE AT LEAST MINUS 20
CELSIUS OR BELOW AND THIS IS PROMOTING STEEP LAPSE RATES. SEVERE
THREAT WILL LIKELY PERSIST BEYOND THE EXPIRATION OF WW 149 AND THE
WATCH MAY NEED TO BE LOCALLY EXTENDED. SVR THREAT WILL MAINLY EXIST
FOR LARGE HAIL. WINDS VEER TO WLY BEHIND CONVECTIVE LINE WHICH
EXTENDS FROM NE OF FAT TO HJO...SO PRIMARY THREAT APPEARS TO REMAIN
OVER PARTS OF MADERA/FRESNO/TULARE COUNTIES.
..TAYLOR.. 04/04/2006
ATTN...WFO...VEF...REV...HNX...STO...
35571825 35601901 36872002 37882038 38551976 38421872
36941704 36141715
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TexasStooge
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#1142 Postby TexasStooge » Thu Apr 06, 2006 7:37 am
Code: Select all
MESOSCALE DISCUSSION 0430
NWS STORM PREDICTION CENTER NORMAN OK
1153 AM CDT WED APR 05 2006
AREAS AFFECTED...ERN UT/WRN CO AND SW WY
CONCERNING...SEVERE THUNDERSTORM POTENTIAL
VALID 051653Z - 051900Z
THUNDERSTORM DEVELOPMENT WILL CONTINUE THROUGH EARLY AFTERNOON
ACROSS WRN CO...ERN UT AND SWRN WY. THE MORE INTENSE STORMS WILL
HAVE A POTENTIAL FOR HAIL AND ISOLATED WIND DAMAGE. A WW WILL LIKELY
BECOME NECESSARY BY THIS AFTERNOON ACROSS THE REGION.
WATER VAPOR IMAGERY CURRENTLY SHOWS AN IMPRESSIVE WEST COAST
UPPER-LEVEL TROUGH WITH A DRY SLOT AND BAND OF STRONG LARGE-SCALE
ASCENT DRIFTING ENEWD ACROSS THE REGION. A LINE OF STORMS IS ONGOING
ALONG THE LEADING EDGE OF ASCENT AND ADDITIONAL STORMS SHOULD
DEVELOP ACROSS ERN UT OVER THE NEXT HOUR AS SFC TEMPS WARM TO NEAR
70 F AND ASCENT INCREASES IN THE NOSE OF A 100 KT MID-LEVEL JET.
FORECAST SOUNDINGS ACROSS THE REGION THIS AFTERNOON SHOW VERY STEEP
MID-LEVEL LAPSE RATES AND STRONG VERTICAL SHEAR SUGGESTING
SUPERCELLS WITH HAIL POTENTIAL WILL INCREASE. IN ADDITION...SFC
TEMP-DEWPOINT DEPRESSIONS WILL EXCEED 30 DEGREES F ENHANCING THE
WIND DAMAGE POTENTIAL WITH THE STRONGER CELLS.
..BROYLES.. 04/05/2006
ATTN...WFO...PUB...CYS...ABQ...RIW...GJT...FGZ...SLC...PIH...
36770798 36740897 37400978 38851007 40951077 41831106
42231108 42741046 42950907 42490809 41200763 40080736
38740711 38670697 37530713 37060743
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TexasStooge
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#1143 Postby TexasStooge » Thu Apr 06, 2006 7:38 am
Code: Select all
MESOSCALE DISCUSSION 0431
NWS STORM PREDICTION CENTER NORMAN OK
0459 PM CDT WED APR 05 2006
AREAS AFFECTED...NRN WY INTO S-CNTRL AND SERN MT
CONCERNING...SEVERE THUNDERSTORM POTENTIAL
VALID 052159Z - 052330Z
POTENTIAL FOR LOCALLY STRONG WIND GUSTS AND PERHAPS ISOLATED LARGE
HAIL WILL INCREASE ACROSS AREA LATE THIS AFTERNOON INTO EVENING.
CONVECTIVE TRENDS ARE BEING MONITORED FOR A POSSIBLE WW.
LATEST MESOANALYSIS INDICATED LOW PRESSURE S OF LND AND SW COD WITH
ATTENDANT WARM FRONT EXTENDING ENEWD ACROSS FAR SERN MT AND THEN
INTO CNTRL SD. TRAILING COLD FRONT THEN EXTENDED SWD FROM THESE LOW
PRESSURE CENTERS INTO WRN CO. WELL-DEFINED RISE-FALL COUPLET FROM
N-CNTRL WY INTO ERN UT SUGGESTS THAT THIS LOW PRESSURE WILL CONTINUE
TO DEVELOP NEWD INTO SRN MT THIS EVENING.
MODIFICATION OF 18Z RIW SOUNDING FOR CURRENT SURFACE OBSERVATIONS
ACROSS N-CNTRL WY INDICATES STEEP LOW TO MID-LEVEL LAPSE RATES AND
SBCAPES OF AROUND 1000 J/KG. GIVEN A DEEP AND WELL-MIXED
BOUNDARY-LAYER COUPLED WITH DCAPES OF 1000-1300 J/KG...POTENTIAL
WILL EXIST FOR LOCALLY STRONG DOWNDRAFTS WITH MOST INTENSE STORMS.
MOREOVER...40-50 KTS OF DEEP-LAYER SHEAR ALSO SUGGESTS A THREAT OF
MARGINAL SUPERCELL STRUCTURES CAPABLE OF ISOLATED LARGE HAIL.
STRENGTHENING UPPER DIVERGENCE AHEAD OF EVOLVING UPPER LOW OVER THE
GREAT BASIN SHOULD SUPPORT AN INCREASE IN CONVECTIVE COVERAGE LATE
THIS AFTERNOON INTO EVENING ACROSS N-CNTRL/NERN WY INTO S-CNTRL AND
SERN MT. PRIMARY QUESTION IS WHETHER THIS STRONGER FORCING FOR
ASCENT WILL SUFFICIENTLY OFFSET A COOLING BOUNDARY-LAYER AFTER
23-00Z...SUSTAINING A SEVERE THREAT THROUGH THE EVENING.
..MEAD.. 04/05/2006
ATTN...WFO...UNR...CYS...BYZ...RIW...
43190960 44161028 45750960 46490779 46300568 44980442
43590459 42890561 42560709
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TexasStooge
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#1144 Postby TexasStooge » Thu Apr 06, 2006 7:38 am
Code: Select all
MESOSCALE DISCUSSION 0432
NWS STORM PREDICTION CENTER NORMAN OK
0541 PM CDT WED APR 05 2006
AREAS AFFECTED...SWRN WY / ERN UT / WRN CO
CONCERNING...SEVERE THUNDERSTORM WATCH 151...
VALID 052241Z - 052345Z
POTENTIAL FOR LOCALLY STRONG WIND GUSTS WILL LIKELY CONTINUE BEYOND
23Z...HOWEVER AN ADDITIONAL WW IS NOT ANTICIPATED ATTM.
CLUSTERS OF TSTMS ARE ONGOING AS OF 2225Z FROM N-CNTRL NM NWD
THROUGH PORTIONS OF WRN AND CNTRL CO INTO WRN AND CNTRL WY WITHIN
ZONE OF STRONG LARGE-SCALE FORCING FOR ASCENT ASSOCIATED WITH UPPER
LOW EVOLVING OVER THE GREAT BASIN. REGIONAL VWPS INDICATE LARGELY
UNIDIRECTIONAL WIND PROFILES WITH RELATIVELY STRONG VERTICAL SPEED
SHEAR...SUPPORTIVE OF ORGANIZED SEVERE TSTMS. HOWEVER...VISIBLE
SATELLITE AND SURFACE OBSERVATIONS INDICATE THAT CONSIDERABLE CLOUDS
AND PRECIPITATION HAVE RESULTED IN COOLING OF PRE-FRONTAL
BOUNDARY-LAYER ACROSS WRN INTO CNTRL CO WHICH IS EFFECTIVELY
LIMITING THE DEGREE OF INSTABILITY.
THROUGH 23-01Z...IT APPEARS THE GREATEST THREAT OF LOCALLY STRONG
WIND GUSTS AND/OR MARGINALLY SEVERE HAIL WILL EXIST ACROSS NRN
PORTIONS OF WW AREA INTO N-CNTRL WY/S-CNTRL AND SERN MT WHERE
INTENSIFYING LARGE-SCALE FORCING WILL BECOME CO-LOCATED WITH A ZONE
OF WEAK TO MODERATE INSTABILITY. ELSEWHERE...AN ISOLATED SEVERE
WEATHER THREAT MAY EXIST BEYOND 23Z...HOWEVER IT APPEARS THAT THE
TEMPORAL DURATION OF THIS THREAT WILL BE TOO LIMITED TO WARRANT THE
ISSUANCE OF AN ADDITIONAL WW.
..MEAD.. 04/05/2006
ATTN...WFO...PUB...BOU...CYS...ABQ...RIW...GJT...FGZ...SLC...PIH...
43521113 43560949 42540830 42470568 36600617 36741098
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TexasStooge
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#1145 Postby TexasStooge » Thu Apr 06, 2006 7:38 am
Code: Select all
MESOSCALE DISCUSSION 0433
NWS STORM PREDICTION CENTER NORMAN OK
1036 PM CDT WED APR 05 2006
AREAS AFFECTED...E-CNTRL MO NWD INTO CNTRL AND SRN IA
CONCERNING...SEVERE THUNDERSTORM POTENTIAL
VALID 060336Z - 060500Z
ELEVATED TSTM COVERAGE IS EXPECTED TO INCREASE ACROSS DISCUSSION
AREA OVERNIGHT. SEVERE HAIL WILL BE POSSIBLE WITH THE MOST INTENSE
STORMS AND CONVECTIVE TRENDS WILL BE MONITORED FOR A WW ISSUANCE.
AS OF 0320Z...REGIONAL RADAR IMAGERY SHOWED A PERSISTENT CLUSTER OF
ELEVATED STORMS FROM WASHINGTON COUNTY NWWD INTO CALLAWAY COUNTY MO
WITH NICKEL TO GOLFBALL-SIZED HAIL RECENTLY REPORTED. ANOTHER
CLUSTER OF ELEVATED TSTMS HAS PERSISTED FROM NEAR CID SEWD TO E OF
UIN. FINALLY...IR SATELLITE DATA SHOW A BAND OF CLOUD ENHANCEMENT
FROM THE ONGOING...E-CNTRL MO ACTIVITY NWWD TO NEAR OMA.
REGIONAL VWP/PROFILER DATA AND SHORT-TERM MODEL GUIDANCE SUGGEST
THAT THIS ACTIVITY IS OCCURRING ALONG AN INTENSIFYING SLY/SWLY LLJ
ON THE ERN OR NERN EDGE OF CAP WHICH IS IN PLACE OVER THE CNTRL
PLAINS /PER 00Z SOUNDING OBSERVATIONS/. HERE...INCREASING MOISTURE
IN THE 850-800 MB LAYER BENEATH STEEP MID-LEVEL LAPSE RATES ARE
RESULTING IN AIR MASS DESTABILIZATION FOR ELEVATED PARCELS WITH
MUCAPES OF 1000-1500 J/KG.
AN INCREASE IN STORM COVERAGE IS ANTICIPATED OVERNIGHT OWING TO
FURTHER STRENGTHENING OF LLJ AND RESULTANT FORCING VIA WAA AND
ISENTROPIC ASCENT. GIVEN THE MODERATE INSTABILITY AND SHEAR THROUGH
THE CLOUD-BEARING LAYER...SEVERE HAIL WILL BE POSSIBLE WITH THE
STRONGEST STORMS.
..MEAD.. 04/06/2006
ATTN...WFO...ILX...LSX...DVN...DMX...EAX...OAX...
38479132 38539224 40279512 41519592 41969536 42129316
41839182 40539070 39079055 38699088
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TexasStooge
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#1146 Postby TexasStooge » Thu Apr 06, 2006 7:39 am
Code: Select all
MESOSCALE DISCUSSION 0434
NWS STORM PREDICTION CENTER NORMAN OK
0120 AM CDT THU APR 06 2006
AREAS AFFECTED...CNTRL/SRN SD AND EXTREME NRN NEB
CONCERNING...SEVERE THUNDERSTORM POTENTIAL
VALID 060620Z - 060745Z
TSTMS OVER SWRN SD WILL LIKELY EXPAND ESEWD INTO EXTREME NRN NEB AND
ACROSS A LARGE PART OF SRN/CNTRL SD EARLY THIS MORNING. STRONGER
STORMS WILL PRODUCE LARGE HAIL AND A SEVERE THUNDERSTORM WATCH MAY
BE REQUIRED.
H5 JET OF 70+ KTS ALONG ERN PERIPHERY OF THE WY UPPER LOW WAS NOSING
NWD INTO WRN NEB...PLACING A STRONG DIFFLUENT/DIVERGENT FLOW REGIME
ACROSS THE CNTRL/NRN HIGH PLAINS EARLY THIS MORNING. CORRESPONDING
SLY LLJ OF AROUND 50 KTS WAS IMPINGING ON AN E-W ORIENTED BAROCLINIC
ZONE SITUATED ACROSS THE NE/SD BORDER. RESULTING DEEP UVV WAS
ALREADY SUPPORTING TSTMS ACROSS SWRN SD.
PRIND THAT TSTMS WILL DEVELOP ESEWD ALONG/N OF THE AFOREMENTIONED
BAROCLINIC ZONE INTO EXTREME NRN NEB AND CNTRL/SRN SD THE NEXT FEW
HOURS. THOUGH EFFECTIVE VERTICAL SHEAR IS GENERALLY LESS THAN 35
KTS...LAPSE RATES WERE QUITE STEEP. THUS...AS TSTMS
DEVELOP...UPDRAFTS WILL BE STRONG WITH LARGE HAIL PRODUCTION QUITE
LIKELY. AS THE NUMBER OF STORMS INCREASE...COMPETITION OF UPDRAFTS
MAY TEND TO TEMPER THE SEVERITY OF THE STORMS LATER IN THE MORNING.
BUT...THERE APPEARS THAT THERE WILL BE A FEW HOURS OF LARGE HAIL
POTENTIAL AND A WW MAY BE REQUIRED.
..RACY.. 04/06/2006
ATTN...WFO...FSD...OAX...ABR...LBF...UNR...CYS...
44870270 44689987 44379712 44039719 42089784 42319911
43020306
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TexasStooge
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#1147 Postby TexasStooge » Thu Apr 06, 2006 7:40 am
Code: Select all
MESOSCALE DISCUSSION 0435
NWS STORM PREDICTION CENTER NORMAN OK
0601 AM CDT THU APR 06 2006
AREAS AFFECTED...SERN NEB...NERN KS...NWRN MO
CONCERNING...OUTLOOK UPGRADE
VALID 061101Z - 061300Z
AFTER COLLABORATION WITH THE TOP/OAX/EAX WEATHER FORECAST OFFICES...
THE STORM PREDICTION CENTER IS EXPECTED TO UPGRADE SERN NEB...NERN
KS AND NWRN MO TO A CATEGORICAL HIGH RISK AT 13Z.
H5 12-HR HEIGHT FALLS OF 210 METERS WILL SPREAD ENEWD ACROSS THE
CNTRL PLAINS THIS AFTN. TSTMS ARE EXPECTED TO DEVELOP BY EARLY AFTN
ALONG THE DRYLINE/SFC LOW FROM SCNTRL NEB INTO CNTRL KS AS
INHIBITION IS ERODED. STORMS SHOULD QUICKLY ORGANIZE INTO
SUPERCELLS GIVEN STRONG VERTICAL SHEAR PROFILES /H5 FLOW OF 105 KTS
OVER OKLA...WITH AOA 60 KTS INTO ERN KS/.
THE 2-8KM SHEAR VECTORS REMAIN SUFFICIENTLY NORMAL TO THE INITIATING
BOUNDARY TO SUPPORT DISCRETE CELLS...THOUGH ACTIVITY WILL TEND TO
EVOLVE INTO A MIXED MODE OF LEWPS/BOWS WITH TIME.
NONETHELESS...BACKED SELY LOW-LEVEL FLOW E/NE OF THE SFC LOW/WARM
FRONT WILL BE FAVORABLE FOR TORNADOES...SOME STRONG...AS THE STORMS
MOVE ENEWD AT 30-40 KTS ACROSS NERN KS...SERN NEB AND NWRN MO. VERY
LARGE HAIL CAN ALSO BE EXPECTED GIVEN STEEP MID-LEVEL LAPSE RATES
AND 2000-2500 J/KG MLCAPE.
..RACY/EVANS.. 04/06/2006
ATTN...WFO...EAX...OAX...TOP...
38339578 39589716 40779702 40919601 40319468 39399408
38529421 38249500
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TexasStooge
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#1148 Postby TexasStooge » Thu Apr 06, 2006 11:40 am
Code: Select all
MESOSCALE DISCUSSION 0436
NWS STORM PREDICTION CENTER NORMAN OK
1103 AM CDT THU APR 06 2006
AREAS AFFECTED...ERN OK/SW MO/WRN AR/ERN TX
CONCERNING...SEVERE THUNDERSTORM POTENTIAL
VALID 061603Z - 061800Z
...POTENTIAL FOR ISOLD SEVERE STORMS THROUGH EARLY AFTN FROM ECNTRL
OK SWD TO PARTS OF ERN TX...AND EWD INTO AR...
ELEVATED TSTMS CONTINUE TO INTENSIFY ACROSS ECNTRL OK...WITH LATEST
TULSA OK RADAR IMAGERY SUGGESTING INTENSE MID LEVEL CORES. LATEST WV
IMAGERY INDICATES AN IMPULSE NOW MOVING ACROSS CNTRL KS/OK...AND
THIS IS LIKELY AGITATING THE STORMS. IN ADDITION...LARGE SCALE
ASCENT IS BEING AUGMENTED BY DIFFLUENT FLOW ALOFT. 12Z SOUNDING FROM
NORMAN OK SHOWED AROUND 1700 J/KG MUCAPE...WITH SLIGHTLY STRONGER
CAPE EVIDENT ON THE 12Z SPRINGFIELD MO SOUNDING. SPECIAL 15Z
SOUNDING FROM SPRINGFIELD SUGGESTS STORMS ARE ROOTED NEAR 700MB.
STORMS ARE FORMING WITHIN AN ENVIRONMENT OF STRONG DEEP LAYER SHEAR
/AROUND 40 KT/ AND MODERATE ELEVATED INSTABILITY. STORMS ARE
EXPECTED TO CONTINUE DEVELOPING SWD...WITH THE MAIN THREAT FROM
LARGE HAIL.
..TAYLOR.. 04/06/2006
ATTN...WFO...LZK...SGF...SHV...TSA...HGX...ICT...FWD...OUN...
33039395 30769505 30649667 33689707 36159641 37239475
37299338 36099266 33919325
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TexasStooge
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#1149 Postby TexasStooge » Thu Apr 06, 2006 11:41 am
Code: Select all
MESOSCALE DISCUSSION 0437
NWS STORM PREDICTION CENTER NORMAN OK
1119 AM CDT THU APR 06 2006
AREAS AFFECTED...SERN IA/ERN MO/MUCH OF CENTRAL-SRN IL/FAR SWRN
IND/FAR WRN KY
CONCERNING...SEVERE THUNDERSTORM POTENTIAL
VALID 061619Z - 061715Z
ELEVATED STORMS WILL CONTINUE TO DEVELOP INTO THE AFTERNOON FROM
SERN IA SEWD THROUGH ERN MO/MUCH OF CENTRAL-SRN IL INTO FAR SWRN IND
AND FAR WRN KY.
LATE MORNING SURFACE ANALYSIS SHOWED A DEEPENING SURFACE LOW LOCATED
OVER ERN NEB...WITH A WARM FRONT EXTENDING SEWD THROUGH SWRN IA/NRN
TO ERN MO AROUND STL..AND THEN EWD ACROSS SRN IL INTO FAR SRN IND.
A SURFACE TROUGH EXTENDED SWD FROM CENTRAL MO /BOONE COUNTY/ INTO
NRN AR. LARGE SCALE ASCENT DOWNSTREAM OF SHORT WAVE TROUGH LOCATED
OVER CENTRAL KS/OK WILL SUPPORT ADDITIONAL ELEVATED STORMS TO THE
NORTH OF THE WARM FRONT AND EAST OF THE SURFACE TROUGH...AS THIS MID
LEVEL IMPULSE TRACKS NEWD TOWARD THE LOWER MO/MID MS VALLEYS TODAY.
SPECIAL 15Z SOUNDING AT SGF CONTINUED TO INDICATE A STEEP LAPSE RATE
ENVIRONMENT OVER MO...BUT THE AIR MASS REMAINS CAPPED. 15Z RUC
SOUNDINGS ACROSS THE DISCUSSION AREA SUGGEST STORMS ARE ROOTED
AROUND 850 MB WITH CLOUD LAYER SHEAR SUPPORTIVE OF ELEVATED ROTATING
STORMS. WEAK INSTABILITY SHOULD LIMIT THE COVERAGE OF STRONGER
CORES. HOWEVER...STEEP LAPSE RATES INDICATED A THREAT FOR ISOLATED
HAIL...LOCALLY EXCEEDING SEVERE LEVELS AT TIMES.
..PETERS.. 04/06/2006
ATTN...WFO...LMK...IND...PAH...ILX...LSX...DVN...DMX...EAX...
40639240 41659279 41989165 41799039 40608889 39848761
38408698 36838743 36628864 36728976 37889107 39269164
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TexasStooge
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#1150 Postby TexasStooge » Thu Apr 06, 2006 12:24 pm
Code: Select all
MESOSCALE DISCUSSION 0438
NWS STORM PREDICTION CENTER NORMAN OK
1212 PM CDT THU APR 06 2006
AREAS AFFECTED...CNTRL THROUGH ERN NEB THROUGH MUCH OF CNTRL KS
CONCERNING...SEVERE THUNDERSTORM POTENTIAL
VALID 061712Z - 061915Z
THUNDERSTORMS ARE EXPECTED TO DEVELOP ACROSS PORTIONS OF CNTRL NEB
SWD THROUGH CNTRL KS BETWEEN 19 AND 21Z. ORGANIZED STORM STRUCTURES
APPEAR LIKELY INCLUDING SUPERCELLS AND LINE SEGMENTS. THREATS WILL
INCLUDE LARGE HAIL AND A FEW TORNADOES. ISOLATED DAMAGING WIND WILL
ALSO BE POSSIBLE. A TORNADO WATCH WILL LIKELY BE NEEDED FOR PORTIONS
OF THESE AREAS BY 18Z.
EARLY THIS AFTERNOON A SURFACE FRONT EXTENDS FROM A LOW IN E CNTRL
NEB SWWD THROUGH W CNTRL KS THEN SWD AS A DRYLINE/PACIFIC FRONT
THROUGH WRN OK AND THE ERN PORTION OF WRN TX. WV IMAGERY SHOWS A
LOBE OF VORTICITY AND ACCOMPANYING UPPER JET ADVANCING ENEWD THROUGH
WRN KS AND WRN NEB. ASCENT AND HEIGHT FALLS ASSOCIATED WITH THIS
FEATURE WILL CONTRIBUTE TO SECONDARY CYCLOGENESIS OVER N CNTRL KS
THIS AFTERNOON. LATEST SURFACE ANALYSIS ALREADY SHOWS PRESSURE FALLS
ACROSS CNTRL THROUGH SWRN KS. AS THE SURFACE LOW DEVELOPS...THE
BOUNDARY LAYER FLOW OVER NEB SHOULD BECOME MORE ELY WITH SOME WWD
RETREAT OF THE FRONT AND LOW LEVEL MOISTURE. STRONG SURFACE
HEATING...ASCENT...AND EWD ADVANCE COLDER AIR ALOFT AND STEEPER
LAPSE RATES WILL CONTINUE TO DESTABILIZE THE ATMOSPHERE FROM CNTRL
THROUGH ERN NEB SWD THROUGH CNTRL KS WITH MLCAPE FROM 1500 TO 2000
J/KG LIKELY LATER THIS AFTERNOON. MID LEVEL CLOUDS DEVELOPING ACROSS
PORTIONS OF WRN AND CNTRL KS ARE PROBABLY INDICATIVE OF THE LEADING
EDGE OF ASCENT SPREADING EWD. AS THE ATMOSPHERE CONTINUES TO
DESTABILIZE AND HEIGHT FALLS/FORCING FOR ASCENT SPREAD EWD...STORMS
SHOULD DEVELOP IN VICINITY OF FRONT/DRYLINE FROM CNTRL NEB SWD
THROUGH CNTRL KS AND SUBSEQUENTLY SPREAD NEWD. DEEP LAYER AND LOW
LEVEL SHEAR WILL CONTINUE TO INCREASE AS THE UPPER JET ADVANCES EWD
AND AS SECONDARY BRANCH OF THE LOW LEVEL JET INTENSIFIES ACROSS
KS/ERN NEB IN RESPONSE TO CYCLOGENESIS.
..DIAL.. 04/06/2006
ATTN...WFO...OAX...TOP...ICT...GID...LBF...DDC...GLD...
41229639 39119663 37159726 37339891 39319945 40499975
42000019 42469914 42259744
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TexasStooge
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#1151 Postby TexasStooge » Thu Apr 06, 2006 4:51 pm
Code: Select all
MESOSCALE DISCUSSION 0439
NWS STORM PREDICTION CENTER NORMAN OK
1251 PM CDT THU APR 06 2006
AREAS AFFECTED...CNTRL THROUGH PARTS OF NERN OK
CONCERNING...SEVERE THUNDERSTORM POTENTIAL
VALID 061751Z - 061945Z
N CNTRL THROUGH CNTRL OK ARE BEING MONITORED FOR POSSIBLE
THUNDERSTORM INITIATION BETWEEN 18Z AND 19Z. PRIMARY THREATS WILL BE
SUPERCELLS WITH LARGE HAIL AND ISOLATED TORNADOES. THIS AREA IS
BEING MONITORED FOR A POSSIBLE TORNADO WATCH.
EARLY THIS AFTERNOON A SURFACE FRONT EXTENDS FROM CNTRL KS SSWWD
THROUGH WRN OK. A DRYLINE EXTENDS FROM NWRN TX NWD THROUGH W CNTRL
OK AND INTERSECTS THE FRONT IN S CNTRL KS. STRONG SURFACE HEATING
AND STEEP LAPSE RATES ARE PROMOTING DESTABILIZATION WITHIN THE WARM
SECTOR WHERE DEWPOINTS ARE IN THE LOWER 60S. LATEST OBJECTIVE
ANALYSIS ALREADY SHOW AN AXIS OF MLCAPE ON THE ORDER OF 1500 TO 2000
J/KG ACROSS W CNTRL OK IN ADVANCE OF THE DRYLINE. PRESSURE FALLS
INDICATIVE OF STRONG FORCING FOR ASCENT ASSOCIATED WITH ENEWD
ADVANCING MID LEVEL JET ARE DEVELOPING ACROSS WRN AND W CNTRL KS.
THIS ZONE OF FALLS WILL CONTINUE TO SPREAD EWD WITH SURFACE
CYCLOGENESIS EXPECTED ACROSS CNTRL KS NEXT FEW HOURS. AS THE LOW
DEEPENS...CONVERGENCE WILL INCREASE AND THE DRYLINE/COLD FRONT WILL
SHARPEN. THE INCREASING CONVERGENCE AND FORCING FOR ASCENT MAY BE
SUFFICIENT FOR THUNDERSTORM INITIATION THIS AFTERNOON INTO PARTS OF
CNTRL OK AS THE CAP WEAKENS. LATEST VISIBLE IMAGERY SHOWS BOUNDARY
LAYER CUMULUS INCREASING OVER W CNTRL OK JUST W OF OKC.
STRENGTHENING LOW TO MID LEVEL WIND FIELDS AND VERTICAL SHEAR WILL
SUPPORT SUPERCELL STRUCTURES WITH ANY STORMS THAT DEVELOP.
..DIAL.. 04/06/2006
ATTN...WFO...TSA...OUN...
35099786 35689789 36379788 36949788 36849577 35919599
35119696
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TexasStooge
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#1152 Postby TexasStooge » Thu Apr 06, 2006 4:51 pm
Code: Select all
MESOSCALE DISCUSSION 0440
NWS STORM PREDICTION CENTER NORMAN OK
0115 PM CDT THU APR 06 2006
AREAS AFFECTED...SW OK THROUGH SW TX
CONCERNING...CONVECTIVE TRENDS
VALID 061815Z - 061945Z
...DRYLINE BEING MONITORED FOR CONVECTIVE TRENDS ACROSS SW OK
THROUGH TX...
LATEST VISIBLE SATELLITE IMAGERY SHOWS BLOWING DUST WEST OF THE
DRYLINE AND BOUNDARY LAYER CUMULUS EAST. EARLY THIS AFTN...THE
DRYLINE EXTENDS FROM JUST EAST OF HBR/FDR/SNK/FST. UPPER/MID LEVEL
CIRCULATION IS SEEN ON WV LOOPS NOW APPROACHING TX PANHANDLE.
ALTHOUGH MOST OF THE LARGE SCALE FORCING WILL BE FOCUSED NORTH OF
THE AREA...STRONG SFC HEATING COMBINED WITH LOW LEVEL ASCENT FOCUSED
ON THE DRYLINE/PACIFIC FRONT MAY BE ENOUGH TO INITIATE STORMS THIS
AFTN. STEEP LAPSE RATES...COMBINED WITH STRONG DEEP LAYER SHEAR AND
INCREASING MOISTURE INTO THE WARM SECTOR WILL FAVOR STRONG/SEVERE
STORMS...IF AND WHEN DEVELOPMENT OCCURS.
..TAYLOR.. 04/06/2006
ATTN...WFO...FWD...OUN...EWX...SJT...
34709755 32949716 31199785 30259964 30960080 31370067
32439994 32849982 34149889 34429876 34869833
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TexasStooge
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#1153 Postby TexasStooge » Thu Apr 06, 2006 4:52 pm
Code: Select all
MESOSCALE DISCUSSION 0441
NWS STORM PREDICTION CENTER NORMAN OK
0202 PM CDT THU APR 06 2006
AREAS AFFECTED...SD/WRN MN
CONCERNING...SEVERE THUNDERSTORM POTENTIAL
VALID 061902Z - 062100Z
...STRONG AND SEVERE TSTMS WILL CONTINUE ACROSS PORTIONS OF SOUTH
DAKOTA NORTH OF WARM FRONT WITH PRIMARILY A THREAT OF LARGE HAIL...
MORNING UPPER AIR ANALYSIS AT 850 MB REVEALS BAROCLINIC ZONE ACROSS
NRN NEB/SRN SD...AND THIS IS SERVING AS A FOCUS FOR TSTM DEVELOPMENT
THIS AFTN. LARGE SCALE ASCENT WILL INCREASE ACROSS THE AREA...SO
TSTMS ARE EXPECTED TO CONTINUE THROUGH THE AFTN. LATEST SFC
OBSERVATIONAL ANALYSIS SHOWS MUCAPE AROUND 1000-1500 J/KG. STEEP MID
LEVEL LAPSE RATES WILL FAVOR STRONG UPDRAFTS...CAPABLE OF LARGE
HAIL. IN ADDITION...TRAINING CELLS WILL ALSO POSE A HEAVY RAIN
THREAT AS WELL. STORMS MAY HAVE A TENDENCY TO BUILD EWD INTO WRN
PORTIONS OF MN LATER THIS AFTN DUE TO INCREASING WAA.
..TAYLOR.. 04/06/2006
ATTN...WFO...MPX...FGF...FSD...ABR...BIS...UNR...
43819657 43770137 44310263 45640292 46249941 45899568
44269571
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TexasStooge
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#1154 Postby TexasStooge » Thu Apr 06, 2006 4:52 pm
Code: Select all
MESOSCALE DISCUSSION 0442
NWS STORM PREDICTION CENTER NORMAN OK
0324 PM CDT THU APR 06 2006
AREAS AFFECTED...CNTRL THROUGH ERN KS...ERN NEB THROUGH WRN IA
CONCERNING...TORNADO WATCH 154...
VALID 062024Z - 062230Z
STORMS ARE EXPECTED TO INCREASE IN COVERAGE AND INTENSITY TOWARD
EVENING FROM ERN KS INTO ERN NEB. THREAT FOR SUPERCELLS CAPABLE OF
PRODUCING VERY LARGE HAIL AND ISOLATED TORNADOES WILL CONTINUE.
ISOLATED DAMAGING WIND IS ALSO POSSIBLE. STORMS ARE EXPECTED TO
DEVELOP INTO NERN NEB AND WRN IA AFTER 22Z. A WW MAY BE NEEDED FOR
THIS AREA WITHIN THE NEXT HOUR OR TWO.
THUNDERSTORMS WILL CONTINUE TO INCREASE IN VICINITY OF THE PACIFIC
FRONT ACROSS CNTRL KS AS ASCENT ASSOCIATED WITH A STRONG MID LEVEL
JET OVERTAKES THE MOIST AXIS. PRESSURE FALLS HAVE INCREASED OVER
CNTRL KS IN RESPONSE TO AGEOSTROPHIC FORCING ASSOCIATED WITH THIS
FEATURE...AND LEE CYCLONE DEVELOPMENT IS ALSO UNDERWAY OVER N CNTRL
KS. PRIMARY LIMITING FACTOR FOR MORE SIGNIFICANT TORNADOES IN THE
SHORT TERM HAS BEEN THE SOMEWHAT MARGINAL LOW LEVEL SHEAR AND
RELATIVELY HIGH BOUNDARY LAYER-TEMPERATURE DEWPOINT SPREADS.
HOWEVER...THE TORNADO THREAT IS EXPECTED TO INCREASE LATER THIS
AFTERNOON AND EVENING. THE LOW LEVEL JET WILL STRENGTHEN FROM ERN KS
INTO SERN NEB...AND THIS WILL CONTRIBUTE TO AN INCREASE IN LOW LEVEL
SHEAR WITHIN THE PRE-FRONTAL WARM SECTOR. SOME DECREASE IN
TEMPERATURE-DEWPOINT SPREADS MAY ALSO OCCUR TOWARD EVENING AS THE
BOUNDARY LAYER BEGINS TO COOL.
ACTIVITY WILL GRADUALLY DEVELOP NEWD THROUGH ERN AND NERN NEB AS
WELL AS WRN IA TOWARD EVENING AS FORCING FOR ASCENT SPREADS NEWD.
CONVECTIVE MODE WILL INCLUDE SUPERCELLS AS WELL AS LINES WITH LARGE
HAIL...ISOLATED TORNADOES AND DAMAGING WIND POSSIBLE.
..DIAL.. 04/06/2006
ATTN...WFO...DMX...FSD...OAX...LBF...
41939463 41409479 41239539 41629610 41739734 41809878
42329901 42829747 42609539
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TexasStooge
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#1155 Postby TexasStooge » Thu Apr 06, 2006 4:53 pm
Code: Select all
MESOSCALE DISCUSSION 0443
NWS STORM PREDICTION CENTER NORMAN OK
0329 PM CDT THU APR 06 2006
AREAS AFFECTED...SCNTRL MO/NCNTRL AR
CONCERNING...SEVERE THUNDERSTORM WATCH 153...
VALID 062029Z - 062200Z
THE MAIN THREAT ACROSS WW 153 IS NOW EAST OF A RUE/BPK LINE.
ELEVATED TSTMS HAVE MOVED INTO SCNTRL MO AND NCNTRL AR...WITH THE
MOST INTENSE STORM NOW PASSING SE OF FLP. POTENTIAL FOR ADDITIONAL
SEVERE WEATHER WILL INCREASE OVER THE NEXT 2-4 HOURS...AS STORMS
CONTINUE TO DEVELOP ACROSS NE OK AHEAD OF EWD MOVING SFC
BOUNDARY...WHICH EXTENDS ACROSS CNTRL OK. ENVIRONMENT ACROSS NW
AR/SW MO HAS BEEN TEMPORARILY STABILIZED DUE TO ELEVATED STORMS
WHICH OCCURRED EARLIER AND DESTABILIZATION WILL NEED TO OCCUR.
SPECIAL 20Z SOUNDING FROM SPRINGFIELD SHOWS MID LEVEL WARMING HAS
OCCURRED ROUGHLY IN THE 600-700MB LAYER. MLCAPE VALUES ARE 1500-2000
J/KG WITHIN INSTABILITY AXIS ACROSS CNTRL OK. LAPSE RATES REMAIN
STEEP...AND WIND PROFILES REMAIN FAVORABLE FOR ROTATING STORMS.
TO EXPRESS THIS INCREASING SEVERE THREAT ACROSS NE OK/NW AR...THE
HIGH RISK HAS BEEN EXTENDED INTO THIS AREA AS OF 20Z.
FOR THE REMAINDER OF WW 153 HOWEVER...THE POTENTIAL FOR ELEVATED
TSTMS IS DIMINISHING...AND THE WATCH WILL LIKELY EXPIRE AS SCHEDULED
AT 23Z. A NEW WATCH WILL BE NEEDED WITHIN A FEW HOURS...POSSIBLY
INCLUDING ERN PORTIONS OF TORNADO WATCH 155 AND POINTS FARTHER EAST.
..TAYLOR.. 04/06/2006
ATTN...WFO...MEG...LZK...SGF...
35479151 35079341 35809321 37319268 37639151 37169144
35999136
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TexasStooge
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#1156 Postby TexasStooge » Thu Apr 06, 2006 4:54 pm
Code: Select all
MESOSCALE DISCUSSION 0444
NWS STORM PREDICTION CENTER NORMAN OK
0421 PM CDT THU APR 06 2006
AREAS AFFECTED...ERN OK/WRN AR
CONCERNING...TORNADO WATCH 155...
VALID 062121Z - 062245Z
...WATCH WILL NEED TO BE ISSUED SHORTLY FOR PORTIONS OF WRN AND NRN
AR...
TSTMS DEVELOPING MOVING INTO SEBASTIAN CO ARE SFC BASED...AND WILL
HAVE AN INCREASING THREAT FOR ROTATING CELLS/TORNADOES. THUS...A
TORNADO WATCH WILL NEED TO BE CONSIDERED FOR AR AND MO SOON.
FARTHER WEST...TORNADO HAS BEEN REPORTED WITH SUPERCELL ACROSS OSAGE
CO AND VAD WIND DATA FROM TULSA CONTINUES TO BE VERY FAVORABLE FOR
SUPERCELLS WITH TORNADOES AND LARGE HAIL.
..TAYLOR.. 04/06/2006
ATTN...WFO...LZK...SGF...SHV...TSA...ICT...OUN...
34149385 34419573 35529671 36869665 37109581 37019491
36399162 34609218
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TexasStooge
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#1157 Postby TexasStooge » Thu Apr 06, 2006 7:44 pm
Code: Select all
MESOSCALE DISCUSSION 0445
NWS STORM PREDICTION CENTER NORMAN OK
0453 PM CDT THU APR 06 2006
AREAS AFFECTED...FAR ERN KS INTO WRN AND CNTRL MO
CONCERNING...SEVERE THUNDERSTORM POTENTIAL
VALID 062153Z - 062330Z
POTENTIAL FOR SUPERCELLS CAPABLE OF VERY LARGE HAIL AND TORNADOES IS
EXPECTED TO SPREAD E OF WW 154 BY 23Z AND A NEW TORNADO WATCH WILL
BE REQUIRED.
AS OF 21Z...MESOANALYSIS INDICATED A RAPIDLY DEEPENING SURFACE LOW
OVER S-CNTRL NEB WITH ATTENDANT DRYLINE SURGING ENEWD THROUGH
S-CNTRL INTO ERN KS. INTENSE LARGE-SCALE FORCING FOR ASCENT AHEAD
OF MID-LEVEL TROUGH AND ASSOCIATED 90-100 KT JET STREAK ARE
CONTRIBUTING INCREASING STORM COVERAGE AND INTENSITY FROM MARION
COUNTY KS SEWD INTO OSAGE COUNTY OK.
STEEP LAPSE RATES COUPLED WITH DIABATIC HEATING AND MODEST
BOUNDARY-LAYER DEWPOINTS HAVE CONTRIBUTED TO A MODERATELY UNSTABLE
AIR MASS LATE THIS AFTERNOON E OF ONGOING STORMS WITH MLCAPES OF
1000-2000 J/KG. REGIONAL PROFILERS AND VWPS INDICATE DESCENDING MID
AND HIGH-LEVEL JET ACROSS INSTABILITY AXIS WITH 55-65 KTS OF
DEEP-LAYER SHEAR. MOREOVER...TRENDS IN NEODESHA KS PROFILER SHOW
THAT LOW-LEVEL SHEAR HAS STEADILY INCREASED THROUGH THE AFTERNOON.
THIS TREND WILL CONTINUE THROUGH THE REMAINDER OF THE AFTERNOON INTO
THIS EVENING EWD INTO WRN AND CNTRL MO...SUGGESTING A THREAT FOR
LONG-LIVED SUPERCELLS CAPABLE OF A COUPLE STRONG TORNADOES.
..MEAD.. 04/06/2006
ATTN...WFO...LSX...SGF...DMX...EAX...TSA...OAX...TOP...ICT...
39979556 40569467 40589317 39699257 37519211 36699275
36509328 36539433 36669483
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TexasStooge
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#1158 Postby TexasStooge » Thu Apr 06, 2006 7:44 pm
Code: Select all
MESOSCALE DISCUSSION 0446
NWS STORM PREDICTION CENTER NORMAN OK
0707 PM CDT THU APR 06 2006
AREAS AFFECTED...NCNTRL THROUGH SCNTRL TX
CONCERNING...SEVERE THUNDERSTORM WATCH 156...
VALID 070007Z - 070130Z
LATEST MESOANALYSIS SHOWS PACIFIC COLD FRONT/DRYLINE EXTENDING FROM
LUD/SEP/DRT. AHEAD OF THIS BOUNDARY...SVR TSTM HAS DEVELOPED OVER
BURNET COUNTY...WITH A STRONG MID LEVEL CORE AND WITHIN A STRONGLY
SHEARED ENVIRONMENT. VISIBLE SATELLITE IMAGERY SHOWS CUMULUS FIELD
EXTENDING SWD TO DRT. MODERATE INSTABILITY AXIS SHOWS MLCAPE RANGING
FROM 1500-2000 J/KG WITHIN AIRMASS WHERE DEWPOINTS ARE STILL IN THE
60S. WATER VAPOR IMAGERY SUGGESTS STRONGEST FORCING IS FOCUSED
FARTHER NORTH...SO ADDITIONAL DEVELOPMENT IS EXPECTED TO BE ISOLD.
HOWEVER...ANY SUSTAINED STORMS THAT FORM WILL LIKELY BECOME SEVERE
WITH THE MAIN THREAT OF LARGE HAIL OR DAMAGING WINDS.
..TAYLOR.. 04/07/2006
ATTN...WFO...SHV...TSA...HGX...FWD...OUN...EWX...SJT...
30199683 30379848 31379861 33979708 33789457 30709622
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TexasStooge
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#1159 Postby TexasStooge » Thu Apr 06, 2006 7:44 pm
Code: Select all
MESOSCALE DISCUSSION 0447
NWS STORM PREDICTION CENTER NORMAN OK
0712 PM CDT THU APR 06 2006
AREAS AFFECTED...WRN IA / NWRN MO
CONCERNING...SEVERE THUNDERSTORM POTENTIAL
VALID 070012Z - 070115Z
THREAT OF LARGE HAIL...LOCALLY DAMAGING WINDS AND PERHAPS A FEW
TORNADOES IS EXPECTED TO DEVELOP E OF WW 154 PRIOR 01-02Z. A NEW WW
WILL LIKELY BE REQUIRED.
AS OF 2355Z...REGIONAL RADAR IMAGERY INDICATED WIDESPREAD TSTMS
ONGOING OVER PORTIONS OF ERN NEB...TO THE E OF OCCLUDING SURFACE LOW
OVER CNTRL NEB. WITHIN THIS BROADER CONVECTIVE SHIELD...A MESOSCALE
CIRCULATION WAS OBSERVED LIFTING NEWD THROUGH
SEWARD...LANCASTER...SALINE...JEFFERSON AND GAGE COUNTIES. OMA AND
TOP RADAR DATA INDICATE THE PRESENCE OF SMALLER-SCALE SUPERCELL
STRUCTURES WITHIN N-S BAND ALONG ERN EDGE OF THIS CIRCULATION AS FAR
S AS NEMAHA AND POTTAWATOMIE COUNTIES IN NERN KS.
PRESENCE OF DEEP-LAYER FORCING FOR ASCENT IN DIFLUENT REGION OF
UPPER SYNOPTIC SYSTEM SHOULD SUPPORT CONTINUED DEVELOPMENT NEWD INTO
WRN IA/NWRN MO THROUGH THE EVENING. DESPITE LARGELY MERIDIONAL MID
AND HIGH-LEVEL WIND FIELDS...BACKED SURFACE WINDS E/SE OF THE
SURFACE LOW ARE RESULTING IN VERTICAL SHEAR PROFILES SUPPORTIVE OF
SUPERCELLS WITH AN ANTICIPATED CONTINUING THREAT OF LARGE
HAIL...LOCALLY DAMAGING WIND GUSTS AND PERHAPS A FEW TORNADOES.
..MEAD.. 04/07/2006
ATTN...WFO...DMX...EAX...FSD...OAX...TOP...
42119626 42249580 42129513 41199411 39519384 39119413
38949469 39219512
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TexasStooge
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#1160 Postby TexasStooge » Fri Apr 07, 2006 8:43 am
Code: Select all
MESOSCALE DISCUSSION 0448
NWS STORM PREDICTION CENTER NORMAN OK
0753 PM CDT THU APR 06 2006
AREAS AFFECTED...ERN OK
CONCERNING...TORNADO WATCH 155...157...
VALID 070053Z - 070230Z
...HIGH POTENTIAL FOR TORNADOES AND LARGE HAIL WITH DISCRETE
SUPERCELLS NOW MOVING ACROSS ERN OK....
LATEST RADAR IMAGERY SHOWS SEVERAL SUPERCELL TSTMS EXTENDING FROM
FAR SE KS TO SE OK. ENVIRONMENTAL PARAMETERS ARE VERY FAVORABLE FOR
STORM ROTATION...WITH 0-1 SRH NEAR 400 M2/S2. HASKELL OK PROFILER
AND VAD DATA FROM BOTH TULSA AND FORT SMITH SHOW VERY IMPRESSIVE
DIRECTION/SPEED SHEAR WITH 50 KT OBSERVED NEAR 1 KM. LAMONT AND
PURCELL PROFILER DATA ALSO SHOW 100KT DOWN TO 3KM...INDICATING THE
EXTREMELY STRONG WINDS...ASSOCIATED WITH EJECTING JET STREAK.
SEVERAL OF THESE STORMS HAVE ALREADY PRODUCED BRIEF
TORNADOES...INCLUDING A RECENT REPORT OF A TORNADO WEST OF EUFAULA
DAM IN HASKELL CO JUST BEFORE 730PM. STORM SIGNATURES DO INDICATE
THAT STORMS ARE FEELING THE EFFECTS OF THE EXTREME SHEAR.
HOWEVER...THE STORMS /BY MAINTAINING SOME SPACE BETWEEN CELLS/ ARE
NOT DESTRUCTIVELY INTERFERING...WHICH DOES INCREASE THE POTENTIAL
FOR TORNADOES. BEST POTENTIAL APPEARS TO BE ACROSS SE OK INTO WCNTRL
AR. AIRMASS IS SLIGHTLY MORE STABLE ACROSS NW AR...BUT MOISTURE IS
RAPIDLY RETURNING IN A SLIGHTLY ELEVATED FASHION. STRENGTH OF SHEAR
SUGGESTS SEVERE THREAT WILL SPREAD INTO PORTIONS OF WW 157 /INTO NRN
AND WRN AR/ THROUGH LATER THIS EVENING.
..TAYLOR.. 04/07/2006
ATTN...WFO...LZK...SGF...SHV...TSA...FWD...OUN...
33789476 33839619 35609549 36979517 36929403 35429388
34569387
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