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Severe Threat Saturday 8/4/12


tornadotony

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Saturdays outlooks seems improved, the spc tripled the slight risk area, and then on sunday, NY/PA/East OH is going to be a hot spot, much stronger low level jet on the nam, then the last event last week

Yeah but weaker upper/mid level dynamics and likely instability, the increase in LL shear/helicity with a stronger LLJ (and favorably vectored out of the SSW) is nice though.

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Meh, everything needs to speed up or slown down about 6-9 hours. Either that, or a massive MCS needs to develop tonight that will force the cold front further SE for tomorrow.

July 4th was about the only severe weather event this season that took place at the perfect time of day around here.

Most of the other events have taken place during the overnight hours or the early daylight hours, which looks to happen with this event as well.

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This system has had my interest for nearly a week and it still does. By reading the AFDs, it sounds like areas like SC and SW Wisconsin and NW Illinois might even have to worry about isolated tornadoes early on if the storms start out supercellular. Some models have most of the precip and severe chances passing to the SE, while others have us right in the middle of it all.

On second thought, I don't know why the heck every AFD mentions the best forcing/frontogenesis occurring in Southern Wisconsin when just about every model has us in the screwhole. Maybe Madison gets something, but all of a sudden I've become pessimistic about rain even.

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That QLCS is really hauling...

http://forecast.weather.gov/showsigwx.php?warnzone=MNZ060&warncounty=MNC053&firewxzone=MNZ060&local_place1=&product1=Severe+Thunderstorm+Warning

SEVERE THUNDERSTORM WARNING

MNC019-053-040415-

/O.NEW.KMPX.SV.W.0250.120804T0339Z-120804T0415Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WARNING

NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN

1039 PM CDT FRI AUG 3 2012

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

CARVER COUNTY IN EAST CENTRAL MINNESOTA...

SOUTHERN HENNEPIN COUNTY IN EAST CENTRAL MINNESOTA...

* UNTIL 1115 PM CDT

* AT 1035 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF

PRODUCING DAMAGING WINDS OF 60 MPH. THIS STORM WAS LOCATED NEAR

MAYER...OR ABOUT 23 MILES SOUTH OF BUFFALO...AND MOVING EAST AT 55

MPH.

LOCATIONS IN THE WARNING INCLUDE...

PLYMOUTH...

MAYER...

NORWOOD/YOUNG AMERICA...

NEW GERMANY...

COLOGNE...

WACONIA...

ST BONIFACIUS...

MINNETRISTA...

CARVER...

VICTORIA...

MOUND...

CHASKA...

MAPLE PLAIN...

ORONO...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR

DAMAGING WINDS IN EXCESS OF 60 MPH. SEEK SHELTER NOW INSIDE A STURDY

STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4492 9399 4507 9345 4481 9326 4479 9331

4478 9338 4481 9343 4480 9345 4481 9350

4480 9357 4475 9363 4473 9392

TIME...MOT...LOC 0339Z 257DEG 46KT 4485 9382

WIND...HAIL 60MPH <.75IN

$$

SPD

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00z SPC WRF is interesting, if anything.....pops some discrete convection over MI in the evening, but doesn't really have any discernible MCS...

Yeah that was a bit surprising to see that, and SPC is kind of ho-hum in their new day 1 outlook.

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Update from MKX:

000

FXUS63 KMKX 041503

AFDMKX

AREA FORECAST DISCUSSION

NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI

1003 AM CDT SAT AUG 4 2012

.UPDATE...MAKING CHANGES ON TIMING AS IOWA CONVECTION LOOKS TO BE

OUR SHOW THIS AFTERNOON. HAVE UPPED POPS TO CATEGORICAL AND HAVE

ADDED SEVERE TO THE GRIDS AS WELL. AXIS OF 1000 DCAPE INTO

SOUTHERN WI...WITH WATER VAPOR/RUC COMBO SHOWING SHORTWAVE NE KS

VICINITY SHIFTING NORTHEAST. MID LEVEL LAPSE RATES OF AROUND 7

WITH BUILDING CAPES INTO SRN WI. ONLY THIN CIRRUS TO CONTEND SO

PLENTY OF HEATING. 0-8 KM SHEAR AROUND 50 KNOTS...AND SEEING SOME

40 KNOTS 0-6 KM. 0-1 SHEAR MORE SO- SO...TORNADO THREAT MINIMAL

BUT NON-ZERO. MAIN CONCERN WILL BE FOR DAMAGING WINDS.

NAM_221_2012080412_F09_CAPE_SURFACE.png

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BULLETIN - EAS ACTIVATION REQUESTED

SEVERE THUNDERSTORM WARNING

NATIONAL WEATHER SERVICE QUAD CITIES IA IL

1259 PM CDT SAT AUG 4 2012

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

MUSCATINE COUNTY IN EAST CENTRAL IOWA...

SCOTT COUNTY IN EAST CENTRAL IOWA...

WESTERN HENRY COUNTY IN NORTHWEST ILLINOIS...

MERCER COUNTY IN NORTHWEST ILLINOIS...

ROCK ISLAND COUNTY IN NORTHWEST ILLINOIS...

DES MOINES COUNTY IN SOUTHEAST IOWA...

LOUISA COUNTY IN SOUTHEAST IOWA...

NORTHERN HENDERSON COUNTY IN WEST CENTRAL ILLINOIS...

NORTHERN WARREN COUNTY IN WEST CENTRAL ILLINOIS...

* UNTIL 215 PM CDT.

* AT 1253 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A

LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS

AROUND 60 MPH. THESE STORMS WERE LOCATED APPROXIMATELY ALONG A

LINE EXTENDING FROM NICHOLS TO 8 MILES NORTHWEST OF DANVILLE...OR

ALONG A LINE EXTENDING FROM 11 MILES NORTH OF COLUMBUS JUNCTION TO

7 MILES EAST OF MOUNT PLEASANT...AND MOVING EAST AT 30 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO

MUSCATINE...KEITHSBURG...ALEDO...ROCK ISLAND...RAPIDS CITY...PORT

BYRON...MOLINE...EAST MOLINE...PRINCETON...AND BETTENDORF.

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