MESOSCALE DISCUSSION 2222
NWS STORM PREDICTION CENTER NORMAN OK
0947 PM CST TUE DEC 08 2009
AREAS AFFECTED...ERN MS THROUGH WRN AND N CNTRL AL
CONCERNING...TORNADO WATCH 797...798...
VALID 090347Z - 090515Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 797...798...CONTINUES.
THREAT FOR ISOLATED TORNADOES...ONE OR TWO OF WHICH COULD BE
STRONG...AND DAMAGING WIND WILL PERSIST NEXT SEVERAL HOURS WITH
GREATEST THREAT FROM E-CNTRL MS THROUGH W-CNTRL AND N-CNTRL AL.
WARM FRONT CONTINUES TO LIFT SLOWLY NWD AND EXTENDS FROM SRN THROUGH
W-CNTRL AL INTO N-CNTRL MS WHERE IT INTERSECTS A COLD FRONT. A 70+
KT LOW LEVEL JET HAS ADVECTED MID 60S DEWPOINTS THROUGH THE WARM
SECTOR WHERE A RESERVOIR OF 500-1000 J/KG MLCAPE RESIDES FROM LA
THROUGH CNTRL MS. INSTABILITY REMAINS AOB 500 J/KG FARTHER EAST INTO
CNTRL AL WHERE 00Z BIRMINGHAM RAOB INDICATED A STABLE LAYER IN THE
LOWEST 2 KM AND STORMS HAVE TENDED TO WEAKEN AS THEY MOVE INTO THE
MORE STABLE AIR NORTH OF THE WARM FRONT. HOWEVER...THE ATMOSPHERE
WILL DESTABILIZE FARTHER NEWD WITH TIME. STORMS WILL CONTINUE
DEVELOPING AND TRAIN NEWD WITHIN ZONE OF ASCENT ASSOCIATED WITH
PRE-FRONTAL CONFLUENCE BANDS AND THE LOW LEVEL JET. STRONG DEEP
SHEAR AND EFFECTIVE STORM RELATIVE HELICITIES AROUND 500 M2/S2 WILL
CONTINUE TO SUPPORT SUPERCELLS AND THE THREAT OF ISOLATED STRONG
TORNADOES.
THE THREAT IS MORE LIMITED BY A STRONGER CAP WITH SWD EXTENT INTO AL
AND BY WEAKER INSTABILITY WITH NWD EXTENT TOWARD SRN TN.
..DIAL.. 12/09/2009
ATTN...WFO...OHX...BMX...HUN...MOB...MEG...JAN...
LAT...LON 35018677 34048630 31898749 31038859 31148996 32198952
34818801 35018677
Possible Severe Weather Outbreak 120809 - 120909
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CrazyC83
- Professional-Met
- Posts: 34001
- Joined: Tue Mar 07, 2006 11:57 pm
- Location: Deep South, for the first time!
MESOSCALE DISCUSSION 2223
NWS STORM PREDICTION CENTER NORMAN OK
1024 PM CST TUE DEC 08 2009
AREAS AFFECTED...E-CNTRL THROUGH NERN AL AND NWRN GA
CONCERNING...SEVERE POTENTIAL...WATCH LIKELY
VALID 090424Z - 090600Z
A NEW TORNADO WATCH WILL LIKELY BE NEEDED SOON FOR NERN AND N-CNTRL
AL THROUGH NWRN AND W-CNTRL GA.
THE ATMOSPHERE WILL CONTINUE TO DESTABILIZE NEWD WITH TIME AS THE
WARM FRONT CURRENTLY LOCATED FROM SWRN GA THROUGH N-CNTRL AL LIFTS
NWD ALONG 80 KT SWLY LOW LEVEL JET. SURFACE PRESSURES CONTINUE TO
FALL IN THIS REGION. A STRONG THETA-E GRADIENT EXISTS ACROSS THE
FRONT WITH TEMPERATURES IN THE 40S AND 50S IN COOL SECTOR AND 60S IN
WARM SECTOR SUGGESTING POTENTIAL FOR RAPID BOUNDARY LAYER
DESTABILIZATION AS THE WARM FRONT PASSES.
..DIAL.. 12/09/2009
ATTN...WFO...FFC...BMX...HUN...
LAT...LON 32288656 33548633 34668670 34758564 33638479 32328469
32288656
NWS STORM PREDICTION CENTER NORMAN OK
1024 PM CST TUE DEC 08 2009
AREAS AFFECTED...E-CNTRL THROUGH NERN AL AND NWRN GA
CONCERNING...SEVERE POTENTIAL...WATCH LIKELY
VALID 090424Z - 090600Z
A NEW TORNADO WATCH WILL LIKELY BE NEEDED SOON FOR NERN AND N-CNTRL
AL THROUGH NWRN AND W-CNTRL GA.
THE ATMOSPHERE WILL CONTINUE TO DESTABILIZE NEWD WITH TIME AS THE
WARM FRONT CURRENTLY LOCATED FROM SWRN GA THROUGH N-CNTRL AL LIFTS
NWD ALONG 80 KT SWLY LOW LEVEL JET. SURFACE PRESSURES CONTINUE TO
FALL IN THIS REGION. A STRONG THETA-E GRADIENT EXISTS ACROSS THE
FRONT WITH TEMPERATURES IN THE 40S AND 50S IN COOL SECTOR AND 60S IN
WARM SECTOR SUGGESTING POTENTIAL FOR RAPID BOUNDARY LAYER
DESTABILIZATION AS THE WARM FRONT PASSES.
..DIAL.. 12/09/2009
ATTN...WFO...FFC...BMX...HUN...
LAT...LON 32288656 33548633 34668670 34758564 33638479 32328469
32288656
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CrazyC83
- Professional-Met
- Posts: 34001
- Joined: Tue Mar 07, 2006 11:57 pm
- Location: Deep South, for the first time!
SEL0
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 800
NWS STORM PREDICTION CENTER NORMAN OK
1110 PM CST TUE DEC 8 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
EASTERN AND NORTHERN ALABAMA
NORTHWEST GEORGIA
EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 1110 PM
UNTIL 600 AM CST.
TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE
MILES EAST AND WEST OF A LINE FROM 30 MILES SOUTH SOUTHWEST OF
MONTGOMERY ALABAMA TO 50 MILES NORTH NORTHEAST OF ROME GEORGIA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU0).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.
OTHER WATCH INFORMATION...CONTINUE...WW 797...WW 798...WW 799...
DISCUSSION...TSTMS NOW IN CNTRL AL...AND OTHERS LIKELY TO CONTINUE
FORMING FARTHER W ALONG SW/NE CONFLUENCE LINE STRADDLING THE MS/AL
BORDER...EXPECTED TO CONTINUE MOVING/DEVELOPING RAPIDLY NEWD INTO NE
AL/NW GA THROUGH EARLY WED. LOW LVL AIR MASS RECOVERY WILL CONTINUE
IN THE WW AREA...GIVEN RECENT TRENDS OF WEDGE FRONT N GA ...STRONG
PRESSURES IN NE AL/NW GA...AND CONTINUED ENE MOTION OF AR UPR VORT.
STRENGTH OF CLOUD LAYER SHEAR AND ORIENTATION OF CONVECTIVE LINES
PARALLEL TO DEEP SW FLOW SUGGEST POTENTIAL FOR A FEW SUSTAINED
STORMS. EMBEDDED BOWS AND POSSIBLE SUPERCELLS COULD PRODUCE DMGG
WIND AND ISOLD BUT STRONG TORNADOES.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
450. MEAN STORM MOTION VECTOR 24060.
...CORFIDI
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 800
NWS STORM PREDICTION CENTER NORMAN OK
1110 PM CST TUE DEC 8 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
EASTERN AND NORTHERN ALABAMA
NORTHWEST GEORGIA
EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 1110 PM
UNTIL 600 AM CST.
TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE
MILES EAST AND WEST OF A LINE FROM 30 MILES SOUTH SOUTHWEST OF
MONTGOMERY ALABAMA TO 50 MILES NORTH NORTHEAST OF ROME GEORGIA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU0).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.
OTHER WATCH INFORMATION...CONTINUE...WW 797...WW 798...WW 799...
DISCUSSION...TSTMS NOW IN CNTRL AL...AND OTHERS LIKELY TO CONTINUE
FORMING FARTHER W ALONG SW/NE CONFLUENCE LINE STRADDLING THE MS/AL
BORDER...EXPECTED TO CONTINUE MOVING/DEVELOPING RAPIDLY NEWD INTO NE
AL/NW GA THROUGH EARLY WED. LOW LVL AIR MASS RECOVERY WILL CONTINUE
IN THE WW AREA...GIVEN RECENT TRENDS OF WEDGE FRONT N GA ...STRONG
PRESSURES IN NE AL/NW GA...AND CONTINUED ENE MOTION OF AR UPR VORT.
STRENGTH OF CLOUD LAYER SHEAR AND ORIENTATION OF CONVECTIVE LINES
PARALLEL TO DEEP SW FLOW SUGGEST POTENTIAL FOR A FEW SUSTAINED
STORMS. EMBEDDED BOWS AND POSSIBLE SUPERCELLS COULD PRODUCE DMGG
WIND AND ISOLD BUT STRONG TORNADOES.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
450. MEAN STORM MOTION VECTOR 24060.
...CORFIDI
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Dave
- Retired Staff
- Posts: 13442
- Age: 74
- Joined: Tue Aug 01, 2006 3:57 pm
- Location: Milan Indiana
- Contact:
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1114 PM CST TUE DEC 8 2009
THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A
* TORNADO WARNING FOR...
SOUTHEASTERN BLOUNT COUNTY IN CENTRAL ALABAMA...
THIS INCLUDES THE CITY OF ONEONTA...
NORTHERN ST. CLAIR COUNTY IN CENTRAL ALABAMA...
ETOWAH COUNTY IN NORTHEAST ALABAMA...
THIS INCLUDES THE CITIES OF...RAINBOW CITY...HOKES BLUFF...
GADSDEN...
* UNTIL 1145 PM CST
* AT 1112 PM CST...THE NATIONAL WEATHER SERVICE DETECTED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR ALLGOOD...MOVING
NORTHEAST AT 60 MPH.
* THE TORNADO WILL BE NEAR...
STEELE...ALTOONA AND 6 MILES SOUTHEAST OF WALNUT GROVE BY 1125 PM
CST...
ATTALLA BY 1135 PM CST...
REECE CITY...NOCCALULA FALLS...ANDERSON AND GADSDEN BY 1140 PM
CST...
THIS INCLUDES...
INTERSTATE 59 EXIT NUMBERS 166 THROUGH 188
TORNADO WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1114 PM CST TUE DEC 8 2009
THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A
* TORNADO WARNING FOR...
SOUTHEASTERN BLOUNT COUNTY IN CENTRAL ALABAMA...
THIS INCLUDES THE CITY OF ONEONTA...
NORTHERN ST. CLAIR COUNTY IN CENTRAL ALABAMA...
ETOWAH COUNTY IN NORTHEAST ALABAMA...
THIS INCLUDES THE CITIES OF...RAINBOW CITY...HOKES BLUFF...
GADSDEN...
* UNTIL 1145 PM CST
* AT 1112 PM CST...THE NATIONAL WEATHER SERVICE DETECTED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR ALLGOOD...MOVING
NORTHEAST AT 60 MPH.
* THE TORNADO WILL BE NEAR...
STEELE...ALTOONA AND 6 MILES SOUTHEAST OF WALNUT GROVE BY 1125 PM
CST...
ATTALLA BY 1135 PM CST...
REECE CITY...NOCCALULA FALLS...ANDERSON AND GADSDEN BY 1140 PM
CST...
THIS INCLUDES...
INTERSTATE 59 EXIT NUMBERS 166 THROUGH 188
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