Plains/Midwest Windstorm and Svr. Weather (10/25 - 10/27)

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Plains/Midwest Windstorm and Svr. Weather (10/25 - 10/27)

#1 Postby Extremeweatherguy » Sun Oct 24, 2010 2:21 pm

A deep area of low pressure will be responsible for bringing much of the plains and upper midwest very windy conditions starting tomorrow in the south and lifting into the central and northern plains and the great lakes region by Tuesday and Wednesday. A large area of wind advisories and high wind warnings are expected as a result.

Here is a look at the 00z ECMWF's depiction of the event:

Monday Evening:

Image

Image

Notice the tight pressure gradient setting up across the plains. In Oklahoma, for instance, the pressure ranges from near 985-987mb in the northwest to near 999-1000mb in the southeast. 850mb winds (a few thousand feet above the surface) are over 40-50 knots (46-58mph+) across a large area, and while friction will keep surface wind speeds lower than that, mixing throughout the day could bring down sporadic wind gusts in that range.

Tuesday Evening:

Image

Image

The low pressure center really bombs out Tuesday evening across the upper midwest, reaching a minimum central pressure of 964mb according to this run of the ECMWF. The pressure gradient also becomes very tight around the low center, meaning very windy conditions are likely for the area surrounding the low. High wind warnings are possible over a large area with a setup like this.


Here are a few randomly selected forecast discussions from the regions to be affected:


Norman, OK

MONDAY... PRESSURE FALLS WILL KICK IN TO LEE OF ROCKIES AS NOSE OF
STRONG UPPER JET... STILL 160 KT OR SO AT 250MB... PUNCHES E
ACROSS KS/OK. ALL MODELS CONTINUE TO INDICATE 0-1KM WIND SPEEDS
INCREASING TO 30-40KT OVER MOST OF THE AREA DURING THE DAY...
WHICH SUPPORTS SUSTAINED 25-35 MPH AND GUSTS 45-55 MPH. NW OK
USUALLY GETS THE STRONGEST WINDS... BUT IN THIS CASE SPEEDS MAY NOT
BE QUITE AS HIGH THERE JUST AHEAD OF COLD FRONT APPROACHING FROM
KS. WIND ADVISORY ALMOST CERTAINLY WILL BE NEEDED FROM LATE
MORNING ON... MOST LIKELY FROM N TX TO W-CENTRAL OK AND NE INTO
CENTRAL/N-CENTRAL OK.

Lubbock, TX

LONG TERM...
STRONG WINDS STILL EXPECTED MONDAY AS A POTENT POTENTIAL VORTICITY
MAX ALONG THE PACIFIC NORTHWEST COAST ROLLS ACROSS THE CENTRAL
ROCKIES AND DEEPENS OVER THE CENTRAL PLAINS...WHILE MID AND UPPER
LEVEL WINDS TIGHTEN ACROSS SOUTHERN ROCKIES AND HIGH PLAINS.
DOWNWARD VERTICAL MOTION IN LOWER ATMOSPHERE WILL CONTRIBUTE TO
HIGHER SPEEDS WITH LIFT ABOVE PERHAPS LEADING TO PERSISTENT HIGH
CLOUDS ESPECIALLY PANHANDLE AREA THAT MAY COUNTER MIXING ABILITY
TO SOME EXTENT. ANYWAY...MOST GUIDANCE SUGGEST WINDS WILL BE IN
THE 25-35 MPH RANGE LIKELY REQUIRING A WIND ADVISORY FOR AREAS ON
THE CAPROCK. THIS PATTERN TYPICALLY LEADS TO SLIGHTLY WARMER
TEMPERATURES AND SLIGHTLY LOWER DEW-POINTS THAN MODELS CAN PRODUCE
SO WE CONTINUED TO LEAN FORECAST ELEMENTS THAT WAY.

Dodge City, KS

IN ADDITION TO LOWERING TEMPS IN THE N/NE WILL ALSO BE BUMPING UP
THE WINDS AS ALL MODELS SUGGEST A TIGHT PRESSURE GRADIENT PRESENT
BEHIND THE FRONT AND BL/MIXED LAYER/85H WINDS ALL SUGGESTING AT
LEAST WINDY CONDITIONS. COULD EVEN SEE WINDS APPROACH WIND ADV
CRITERIA SO LATER SHIFTS MAY NEED TO MONITOR THIS FOR POSSIBLE
WIND ADV MONDAY AFTERNOON.

Omaha, NE

CONCERN SHIFTS TO INCREASING WINDS TUESDAY BEHIND THE COLD
FRONT...WITH SPEEDS EASILY INCREASING TO SUSTAINED 30 MPH AS
SIGNIFICANT CYCLOGENESIS TAKES PLACE ACROSS THE UPPER MISSISSIPPI
RIVER VALLEY. H85 WINDS ACROSS NORTHEAST NEBRASKA APPROACH 50 TO
55KTS...AND SHOULD BE NEARLY PARALLEL TO THE WESTERLY SURFACE
WINDS...WITH EFFICIENT MOMENTUM TRANSFER. IN FACT...AM SOMEWHAT
CONCERNED THAT WE WILL BE MEETING HIGH WIND CRITERIA OF 40 MPH
SUSTAINED SPEEDS NORTHERN HALF THE CWFA WITH WIND GUSTS EASILY
APPROACHING 50 MPH. STILL JUST SLIGHTLY BEYOND OUR 48 HOUR WIND FOR
ANY WATCH...THUS WILL CONTINUE TO HIGHLIGHT IN THE HWO FOR NOW AND
CONSIDER A WATCH IN LATER FORECAST SHIFTS.


Twin Cities, MN

THE SURFACE LOW IS PROJECTED TO DEEPEN OVER
20 MB IN 18 HOURS BY ALMOST ALL DETERMINISTIC MODELS AS IT EVOLVES
FROM THE CENTRAL PLAINS TO NORTHERN MN. USING THE GFS...ANOMALIES
OF FOUR TO FIVE STANDARD DEVIATIONS OCCUR ON ALMOST ALL KEY
VARIABLES THROUGHOUT THIS TIME. THE STRONGEST DEVIATION IS ON
850MB WIND COMPONENTS...WHICH ARE FORECAST TO BE 55 TO 60 KTS FROM
THE WEST AND NORTHWEST. THIS IS COINCIDENT WITH THE FIRST PUSH OF
COLD AIR ADVECTION ON TUESDAY...AND THE ENVIRONMENTAL WINDS
DIMINISH LITTLE THROUGH THE SECONDARY COLD FRONTAL PASSAGE ON
WEDNESDAY. USING THE CIPS ANALOG DATABASE LOOKING AT PAST EVENTS
OF SIMILAR MAGNITUDE...NOVEMBER 8TH 1986 AND NOVEMBER 10TH
1998...THERE WERE WIND GUSTS OF 35 TO 55 KTS ACROSS THE MN PORTION
OF THE FORECAST AREA. SO ADVISORY CRITERIA WINDS ARE ALMOST A
DEFINITE...WITH HIGH WIND CRITERIA POSSIBLE. A WATCH MAY BE NEEDED
LATER TODAY OR TONIGHT FOR TUESDAY AND WEDNESDAY. WHILE CONFIDENCE
IS HIGH IN THE WINDS...FOR PRECIPITATION TUESDAY AND WEDNESDAY
CONFIDENCE REMAINS LOW.


Milwaukee/Sullivan, WI

MAIN ISSUE IS DEALING WITH STRONG WINDS WITH STRONG LOW PRESSURE
SYSTEM MOVING THROUGH THE REGION FOR MONDAY NIGHT THROUGH MID WEEK.
NAM HAS COME MORE INTO LINE WITH THE GFS/ECWMF TRENDS WITH THIS
SYSTEM. THEY DEEPEN A 985MB SURFACE LOW OVER EASTERN NORTH DAKOTA TO
AROUND 970MB IN EAST CENTRAL MINNESOTA BY 12Z TUESDAY...AND DEEPENS
FURTHER TO AROUND 965MB JUST NORTH OF THE NORTH CENTRAL MINNESOTA
BORDER WITH ONTARIO CANADA BY 00Z WEDNESDAY. THIS IS AROUND A 20MB
DEEPENING IN 24 HOURS...NEARLY BOMB CYCLOGENESIS CRITERIA.

THIS STRONG LOW SWEEPS A STRONG COLD FRONT THROUGH SOUTHERN
WISCONSIN TUESDAY MORNING...WITH A STRONG 50 TO 60 KNOT 850MB LOW
LEVEL JET NOSE POINTING INTO THE REGION AHEAD OF THE FRONT. AREA
FORECAST SOUNDINGS SATURATE MONDAY NIGHT...AND SHOW WEAK BUT
PERSISTENT ELEVATED TALL SKINNY CAPE. THUS...MAINTAINED HIGH POPS
MONDAY NIGHT AND TUESDAY MORNING.

STRONG LOW LEVEL JET WINDS BEHIND THE FRONT SHOULD BEGIN TO MIX TO
THE SURFACE AT TIMES TUESDAY AND TUESDAY NIGHT. SUSTAINED SOUTHWEST
TO WEST WINDS OF 20 TO 30 KNOTS ARE EXPECTED...WITH GUSTS OF 35 TO
45 KNOTS LIKELY AT TIMES. 50 KNOT GUSTS WOULD NOT BE OUT OF THE
QUESTION...IF ENOUGH DOWNWARD MOMENTUM MIXING IS REALIZED. FOR
NOW...WILL HOLD OFF ON ANY HEADLINES...AND LET DAY SHIFT TAKE ONE
MORE LOOK AT THE WIND TRENDS BEFORE DECIDING ON A HIGH WIND WATCH OR
WIND ADVISORY. IT LOOKS TO BE A GOOD WIND ADVISORY SITUATION FOR
TUESDAY THROUGH AT LEAST WEDNESDAY.
Last edited by Extremeweatherguy on Mon Oct 25, 2010 11:13 pm, edited 2 times in total.
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Re: Plains/Upper Midwest Windstorm (10/25 - 10/27)

#2 Postby Aquawind » Sun Oct 24, 2010 2:45 pm

Looks to challenge the all time low pressure of 28.43 inHg (962.7 mb) November 10, 1998 for Minnesota..

Here is a graphic from that system on the 11th.

Image
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Re: Plains/Upper Midwest Windstorm (10/25 - 10/27)

#3 Postby Extremeweatherguy » Sun Oct 24, 2010 8:32 pm

Several high wind watches and warnings have already been issued in anticipation of the event:

Image

High wind watch = dark brown areas
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#4 Postby HarlequinBoy » Mon Oct 25, 2010 11:46 am

The next 48 hours is going to be high impact event I feel for the middle part of America. Numerous major metros are expecting a severe high wind event. The SPC and forecast offices across the MS/TN/OH valleys are starting to sound the alarm on a potentially significant severe weather event as well. The severe weather event I feel continues to increase.
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#5 Postby CrazyC83 » Mon Oct 25, 2010 2:22 pm

Up to a moderate risk for tomorrow for severe weather. Probably should see Round 1 in the form of a Midwest serial derecho (winds 80-100 mph), then high winds remaining behind it.
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Re: Plains/Upper Midwest Windstorm (10/25 - 10/27)

#6 Postby CrazyC83 » Mon Oct 25, 2010 2:23 pm

SPC AC 251727

DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1227 PM CDT MON OCT 25 2010

VALID 261200Z - 271200Z

...THERE IS A MDT RISK OF SVR TSTMS TUESDAY ACROSS PARTS OF
SOUTHEASTERN ILLINOIS...SOUTHERN LOWER MICHIGAN...AND MUCH OF
INDIANA...KENTUCKY AND OHIO...WHERE A FAST MOVING SQUALL LINE MAY BE
ACCOMPANIED BY WIDESPREAD DAMAGING WIND GUSTS...PERHAPS ISOLATED
TORNADOES...

...THERE IS A SLGT RISK OF SVR TSTMS SURROUNDING THE MODERATE RISK
AREA ACROSS MOST AREAS EAST OF THE MISSISSIPPI RIVER INTO THE
VICINITY OF THE APPALACHIANS...

...SYNOPSIS...
MODELS INDICATE THAT THE VERY STRONG UPPER JET...NOW DIGGING ACROSS
THE NORTH CENTRAL PACIFIC COAST THROUGH THE CENTRAL AND SOUTHERN
ROCKIES...WILL CONTINUE TO DEVELOP EASTWARD ACROSS THE U.S. BETWEEN
NOW AND EARLY WEDNESDAY. THIS FEATURE HAS ALREADY SUPPORTED THE
DEVELOPMENT OF A DEEP SURFACE LOW OVER THE NORTHERN PLAINS...AND
STRONG SECONDARY SURFACE CYCLOGENESIS IS PROGGED ACROSS THE CENTRAL
PLAINS INTO THE UPPER MISSISSIPPI VALLEY LATER TODAY THROUGH
TUESDAY. GUIDANCE SUGGESTS THAT THE PRIMARY MID-LEVEL IMPULSE
ASSOCIATED WITH THE EVOLVING SYSTEM WILL PIVOT AROUND THE EASTERN
AND NORTHEASTERN PERIPHERY OF A DEEPENING MID-LEVEL CIRCULATION
ACROSS THE UPPER MIDWEST DURING THE DAY TUESDAY...ACCOMPANIED BY A
100+ KT 500 MB JET ACROSS PARTS OF THE LOWER OHIO VALLEY AND GREAT
LAKES REGION. THIS IS EXPECTED TO OCCUR GENERALLY COINCIDENT WITH
THE EASTWARD AND SOUTHEAST SURGE OF A STRONG COLD FRONT...FROM THE
MISSISSIPPI VALLEY AT 12Z TUESDAY...INTO THE HUDSON/CHAMPLAIN
VALLEY/APPALACHIANS AND LOWER MISSISSIPPI VALLEY BY 12Z WEDNESDAY.

ALTHOUGH MID-LEVEL LAPSE RATES ACROSS THE WARM SECTOR OF THE
EVOLVING CYCLONE DO NOT APPEAR LIKELY TO BE PARTICULARLY STEEP...
SEASONABLY HIGH RETURNING MOISTURE...AS CHARACTERIZED BY AT LEAST A
NARROW TONGUE OF PRECIPITABLE WATER OF 1-1.5 INCHES...WILL
CONTRIBUTE TO WEAK TO MODERATE DESTABILIZATION DURING THIS PERIOD.
AND AT LEAST A RISK FOR THUNDERSTORMS WILL EXIST ACROSS MUCH OF THE
NATION EAST OF THE MISSISSIPPI VALLEY. IN THE PRESENCE OF VERY
STRONG AND SHEARED DEEP LAYER SOUTHWESTERLY FLOW...SEVERE
THUNDERSTORMS ARE LIKELY.

...EASTERN U.S...
MID-LEVEL SUBSIDENCE TO THE SOUTH OF THE CYCLONIC UPPER JET SEEMS
LIKELY TO SUPPRESS CONVECTIVE DEVELOPMENT NEAR CENTRAL/EASTERN GULF
COASTAL AREAS...BUT FORCING ASSOCIATED WITH THE PIVOTING SHORT WAVE
IMPULSE SEEMS LIKELY TO ENHANCE FRONTAL FORCING ACROSS PARTS OF THE
LOWER OHIO VALLEY INTO THE GREAT LAKES TUESDAY MORNING INTO THE
AFTERNOON HOURS. GIVEN ANTICIPATED WARM SECTOR CAPE OF 500 TO 1000
J/KG...THIS SHOULD BE MORE THAN SUFFICIENT TO SUPPORT THE
CONTINUATION OR REINTENSIFICATION OF THUNDERSTORM ACTIVITY
ALONG/JUST AHEAD OF THE SURFACE FRONT FROM PARTS OF SOUTHEASTERN
ILLINOIS INTO INDIANA. THERMODYNAMIC PROFILES MAY NOT BE SUPPORTIVE
OF PARTICULARLY STRONG CONVECTION...BUT THEY APPEAR MORE THAN
FAVORABLE ENOUGH...WITH POTENTIAL FOR SUBSTANTIAL PRECIPITATION
LOADING AND EVAPORATIVE COOLING...TO ENHANCE THE DOWNWARD TRANSPORT
OF HIGH MOMENTUM AIR TO THE SURFACE.

MOST GUIDANCE INDICATES PRE-FRONTAL SOUTHERLY 850 MB FLOW OF 50-70
KTS. SO POTENTIAL APPEARS TO EXIST FOR WIDESPREAD DAMAGING
CONVECTIVE GUSTS...SOME IN EXCESS OF 65 KT...AS AN EVOLVING SQUALL
LINE SPREADS EASTWARD ACROSS PARTS OF LOWER MICHIGAN...
INDIANA...KENUTUCKY...AND OHIO BY LATE TUESDAY AFTERNOON.

NEAR THE SOUTHERN FLANK OF THE SQUALL LINE...AND NEAR THE NORTHERN
EDGE OF STRONGER MID-LEVEL INHIBITION...A BETTER CHANCE FOR MORE
DISCRETE STORM DEVELOPMENT APPEARS TO EXIST...FROM PARTS OF THE
NORTH CENTRAL GULF STATES INTO THE SOUTHERN APPALACHIANS. IF THIS
OCCURS...LOW-LEVEL HODOGRAPHS...DEEP LAYER SHEAR AND BOUNDARY LAYER
INSTABILITY WILL BE CONDUCIVE TO SUPERCELLS CAPABLE OF PRODUCING
TORNADOES.

..KERR.. 10/25/2010

CLICK TO GET WUUS02 PTSDY2 PRODUCT

NOTE: THE NEXT DAY 2 OUTLOOK IS SCHEDULED BY 0600Z
CURRENT UTC TIME: 1920Z (3:20PM), RELOAD THIS PAGE TO UPDATE THE TIME
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#7 Postby RL3AO » Mon Oct 25, 2010 5:47 pm

Going to make a run at the state record I think. Not sure if it will get down to 962.8 mb though.
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#8 Postby CrazyC83 » Mon Oct 25, 2010 5:49 pm

Models seem to want it to get down towards 955mb, but will any station actually pick that up?
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#9 Postby Dave » Mon Oct 25, 2010 6:08 pm

To go along with the day 2 outlook crazyc83 posted above here are the grapics for it from the SPC:

Image

Image
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#10 Postby Dave » Mon Oct 25, 2010 6:27 pm

National Hazards Map as of 2321 UTC

Image

Image

http://www.nws.noaa.gov/largemap.php
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#11 Postby Dave » Mon Oct 25, 2010 6:30 pm

From WAVE 3 TV Louisville KY at 5:30 pm edt todays date

Monday late update from Brian Goode... get ready for a busy 24 hours. The calm before the storm will be tonight with mostly cloudy skies and only a very slight chance for a shower. Tuesday, a powerful cold front will slam into the region. In advance of this front will be strong gusty winds that will begin near sunrise and continue pretty much all day long. Gusts up to 40 mph are possible. On top of that, severe storms are expected to fire near midday. This will enhance those gusty winds to perhaps has high as 75 mph with any storm that can get strong enough. Much calm weather by Wednesday into the weekend.
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Re: Plains/Upper Midwest Windstorm (10/25 - 10/27)

#12 Postby CrazyC83 » Mon Oct 25, 2010 9:15 pm

SPC AC 260059

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0759 PM CDT MON OCT 25 2010

VALID 260100Z - 261200Z

...THERE IS A MDT RISK OF SVR TSTMS FROM ERN MO INTO MUCH OF IL...

...THERE IS A SLGT RISK OF SVR TSTMS FROM NRN AR NWD ACROSS MO/IL
INTO ERN IA AND SRN WI...

--- WIDESPREAD DAMAGING WINDS AND A FEW TORNADOES LIKELY TONIGHT
OVER PORTIONS OF ERN MO AND IL ---


...MO...NRN AR...IA...CNTRL AND WRN IL...SRN WI...
RAPID CHANGES ARE UNDERWAY ACROSS THE CNTRL U.S. AS A POWERFUL UPPER
TROUGH AND JET DEVELOP EWD OUT OF THE PLAINS...REACHING THE LOWER
MO/MID MS VALLEY LATE THIS EVENING AND OVERNIGHT. SATELLITE IMAGERY
CURRENTLY SHOWS THE PRIMARY UPPER VORTICITY CENTER OVER WRN
NEB/KS...WITH A COLD FRONT FROM SERN NEB INTO NWRN OK. SURFACE
ANALYSIS INDICATES DEWPOINTS HAVE RISEN INTO THE LOWER TO MID 60S
ACROSS AR AND ERN OK. SIMILAR BOUNDARY LAYER DEWPOINTS SHOULD
EVENTUALLY REACH SRN IA/CNTRL IL OWING TO INTENSIFYING 50-70 KT LOW
LEVEL JET. COOLING ALOFT AND MOIST ADVECTION WILL WORK TO PRODUCE
MARGINAL...BUT SUFFICIENT INSTABILITY FOR SEVERE STORMS CONSIDERING
THE SHEAR PROFILES IN PLACE. MODEL CONSENSUS IS FOR INITIAL
DEVELOPMENT TO OCCUR BETWEEN 03-06Z ALONG THE COLD FRONT FROM SRN IA
INTO WRN/W-CNTRL MO...THEN MOVING RAPIDLY EWD ACROSS THE MS RIVER
AND IL OVERNIGHT.

A SIGNIFICANT PRESSURE RISE/FALL COUPLET WILL MATERIALIZE AS THE
SYSTEM MATURES WHICH WILL LEND LARGE SCALE SUPPORT TO WIDESPREAD
DAMAGING WIND POTENTIAL. ALTHOUGH INSTABILITY WILL BE
MARGINAL...WIND PROFILES WILL CERTAINLY SUPPORT EMBEDDED
CIRCULATIONS/QLCS STRUCTURES WITH A FEW TORNADOES POSSIBLE.

..JEWELL.. 10/26/2010

CLICK TO GET WUUS01 PTSDY1 PRODUCT

NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 0600Z
CURRENT UTC TIME: 0215Z (10:15PM), RELOAD THIS PAGE TO UPDATE THE TIME
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Re: Plains/Upper Midwest Windstorm (10/25 - 10/27)

#13 Postby CrazyC83 » Mon Oct 25, 2010 9:40 pm

Tornado watch coming. I would expect wind numbers to be in PDS territory if it were a Severe Thunderstorm Watch though (like 90/80, with mention of like 90 mph).

MESOSCALE DISCUSSION 1994
NWS STORM PREDICTION CENTER NORMAN OK
0936 PM CDT MON OCT 25 2010

AREAS AFFECTED...MO...ERN IA...SWRN WI...WRN IL

CONCERNING...SEVERE POTENTIAL...WATCH NEEDED SOON

VALID 260236Z - 260300Z

RAPID RECOVERING WARM SECTOR WILL SOON DESTABILIZE SUFFICIENTLY FOR
CONVECTIVE DEVELOPMENT ALONG SURGING COLD FRONT. LATEST DIAGNOSTIC
DATA SUGGEST PRE-FRONTAL LOW LEVEL LAPSE RATES ARE ACTUALLY
STEEPENING ACROSS ERN KS WHERE SFC-3KM VALUES ARE NOW ON THE ORDER
OF 7 C/KM. THIS...ALONG WITH MOISTENING BOUNDARY LAYER...IS AIDING
NEAR-SFC BASED INSTABILITY WITH A POCKET OF CAPE NEAR 1000 J/KG
SPREADING/DEVELOPING NWD ACROSS NERN OK/NWRN AR INTO SERN KS/SWRN
MO. IT APPEARS THE RECOVERY PROCESS WILL BE MORE THAN ADEQUATE FOR
SEVERE FRONTAL CONVECTION AS FAR NORTH AS THE MN BORDER AFTER
MIDNIGHT AS INTENSE CYCLOGENESIS FOCUSES OVER THE UPPER MS VALLEY.
NEEDLESS TO SAY...EXTREME WIND SHEAR AND 12HR MID LEVEL HEIGHT FALLS
APPROACHING 210M WILL PROVIDE LARGE SCALE SUPPORT FOR A NARROW BAND
OF DAMAGING WINDS IN ASSOCIATION WITH FRONTAL CONVECTION.
ADDITIONALLY...ISOLATED TORNADOES MAY ALSO ACCOMPANY STRONGER LOW
LEVEL CIRCULATIONS.

..DARROW.. 10/26/2010


ATTN...WFO...PAH...LOT...ILX...MKX...LSX...DVN...ARX...SGF...
DMX...EAX...

LAT...LON 37199433 43109371 42818920 39798900 36919025 37199433
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Re: Plains/Upper Midwest Windstorm (10/25 - 10/27)

#14 Postby CrazyC83 » Mon Oct 25, 2010 10:11 pm

The 70 mph has to be a mistake as the probs are 90/70 for wind (would be a PDS if a blue box).

SEL9

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 719
NWS STORM PREDICTION CENTER NORMAN OK
1005 PM CDT MON OCT 25 2010

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

EASTERN IOWA
WESTERN ILLINOIS
MUCH OF MISSOURI
SOUTHWEST WISCONSIN

EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 1005 PM
UNTIL 600 AM CDT.

TORNADOES...HAIL TO 1 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 100 STATUTE
MILES EAST AND WEST OF A LINE FROM 30 MILES NORTHWEST OF LONEROCK
WISCONSIN TO 50 MILES WEST SOUTHWEST OF WEST PLAINS MISSOURI.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU9).

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.

DISCUSSION...THUNDERSTORM DEVELOPMENT IS EXPECTED IN THE NEXT 1-2
HOURS AS A COLD FRONT SURGES EWD FROM KS INTO MO...IN ASSOCIATION
WITH A RAPIDLY DEEPENING LOW OVER WRN IA AND A 100+ KT JET STREAK
ALOFT. INTENSE FORCING FOR ASCENT ALONG THE FRONT SHOULD PROMOTE
SQUALL LINE FORMATION WITH AN ATTENDANT RISK FOR INCREASINGLY
WIDESPREAD WIND DAMAGE OVERNIGHT AS THE LOW-LEVELS
MOISTEN/DESTABILIZE.
OTHER MORE SCATTERED STORMS WILL ALSO BE
POSSIBLE IN THE WARM ADVECTION ZONE FROM NE MO NEWD TOWARD SW WI.
EMBEDDED BOWS AND SUPERCELLS WILL ALSO BE CAPABLE OF PRODUCING A FEW
TORNADOES GIVEN THE VERY STRONG LOW-LEVEL SHEAR...AND DESPITE THE
RELATIVELY WEAK INSTABILITY.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.
MEAN STORM MOTION VECTOR 26040.


...THOMPSON
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#15 Postby CrazyC83 » Mon Oct 25, 2010 10:44 pm

MESOSCALE DISCUSSION 1995
NWS STORM PREDICTION CENTER NORMAN OK
1041 PM CDT MON OCT 25 2010

AREAS AFFECTED...NERN OK...NRN AR

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 260341Z - 260445Z

STRONG FRONTAL FORCING HAS RECENTLY CONTRIBUTED TO A NARROW BAND OF
SHALLOW CONVECTION ACROSS NERN OK INTO EXTREME SERN KS. THIS
ACTIVITY SHOULD DEEPEN AS IT ENCOUNTERS INCREASINGLY MOIST/UNSTABLE
AIRMASS OVER THE NEXT HOUR. THUNDERSTORMS SHOULD SOON EVOLVE ALONG
THE STRONG COLD FRONT WITH LATEST TRENDS FAVORING A SQUALL LINE THAT
SHOULD HOLD CLOSE TO THE WIND SHIFT. THIS ACTIVITY HAS DEVELOPED
JUST SW OF WW719 AND MAY SPREAD INTO PORTIONS OF NRN AR WHERE A
WATCH IS NOT CURRENTLY IN EFFECT. IF CONVECTION CONTINUES TO
DEVELOP SOUTH ALONG COLD FRONT AND IT BECOMES OBVIOUS THAT SEVERE
WILL INDEED OVERSPREAD THIS REGION THEN A SMALL WATCH MAY BE ISSUED
TO COVER THIS THREAT.

..DARROW.. 10/26/2010


ATTN...WFO...LZK...SGF...TSA...

LAT...LON 36879513 36349219 35299285 35539524 36879513

Also storms rapidly developing across Missouri.
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#16 Postby Dave » Mon Oct 25, 2010 10:46 pm

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#17 Postby Dave » Mon Oct 25, 2010 11:06 pm

First warning...

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
1103 PM CDT MON OCT 25 2010

THE NATIONAL WEATHER SERVICE IN PLEASANT HILL HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
SOUTHEASTERN JOHNSON COUNTY IN WEST CENTRAL MISSOURI...
PETTIS COUNTY IN CENTRAL MISSOURI...

* UNTIL 1130 PM CDT

* AT 1100 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
OF 60 MPH. THIS STORM WAS LOCATED 7 MILES NORTH OF WINDSOR...AND
MOVING NORTHEAST AT 55 MPH.

* LOCATIONS IMPACTED INCLUDE...
WHITEMAN AIR FORCE BASE...KNOB NOSTER...SEDALIA...GREEN RIDGE...LA
MONTE...HOUSTONIA...HUGHESVILLE AND SEDALIA MEMORIAL ARPT.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 600 AM CDT TUESDAY MORNING
FOR NORTHERN MISSOURI.
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#18 Postby Dave » Mon Oct 25, 2010 11:13 pm

Then again, more warnings now...posting all that I can tonight, will be busy here in the morning I'm sure and probably not on.

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
1118 PM CDT MON OCT 25 2010

THE NATIONAL WEATHER SERVICE IN PLEASANT HILL HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
NORTHWESTERN COOPER COUNTY IN CENTRAL MISSOURI...
HOWARD COUNTY IN CENTRAL MISSOURI...
NORTHEASTERN PETTIS COUNTY IN CENTRAL MISSOURI...
SOUTHEASTERN SALINE COUNTY IN CENTRAL MISSOURI...

* UNTIL 1145 PM CDT

* AT 1117 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
OF 60 MPH. THIS STORM WAS LOCATED 9 MILES NORTHWEST OF PILOT
GROVE...OR 15 MILES SOUTHEAST OF MARSHALL...AND MOVING NORTHEAST AT
65 MPH.

* LOCATIONS IMPACTED INCLUDE...
BOONVILLE...GLASGOW...FAYETTE...PILOT GROVE...NEW FRANKLIN...
ARMSTRONG...NELSON...BLACKWATER...LAMINE...ARROW ROCK AND FRANKLIN.

THIS WILL IMPACT

I-70 BETWEEN MILE MARKERS 74 AND 100.
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#19 Postby Dave » Mon Oct 25, 2010 11:22 pm

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SPRINGFIELD MO
1117 PM CDT MON OCT 25 2010

THE NATIONAL WEATHER SERVICE IN SPRINGFIELD HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
VERNON COUNTY IN WEST CENTRAL MISSOURI...

* UNTIL MIDNIGHT CDT.

* AT 1113 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM NEAR BRONAUGH...OR 8 MILES NORTH OF VERDELLA...
MOVING NORTHEAST AT 50 MPH. THIS STORM IS CAPABLE OF PRODUCING
QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.

* LOCATIONS IMPACTED INCLUDE BRONAUGH...HARWOOD...MILO...
MONTEVALLO...MOUNDVILLE...NEVADA...SCHELL CITY...SHELDON AND
WALKER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM CAPABLE OF PRODUCING LARGE HAIL AND
DAMAGING WINDS...IF YOU ARE IN ITS PATH SEEK SHELTER INDOORS AND STAY
AWAY FROM WINDOWS.
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#20 Postby Dave » Mon Oct 25, 2010 11:31 pm

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1130 PM CDT MON OCT 25 2010

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
MARION COUNTY IN NORTHEAST MISSOURI...
RALLS COUNTY IN NORTHEAST MISSOURI...

* UNTIL MIDNIGHT CDT

* AT 1129 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
OF 60 MPH. THIS STORM WAS LOCATED NEAR RENSSELAER...OR 6 MILES
EAST OF MONROE CITY...AND MOVING NORTHEAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...
PALMYRA...HANNIBAL AND RENSSELAER.
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