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May 24-? Severe Thread


Hoosier

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Some differences in how the models are handling this system, but it appears there will be enough instability/shear for possible severe storms.  

There is a glaring factor with this setup, and it is capping/warm mid levels.  That may be tough to overcome south of say central WI/Iowa but we'll see.  Possible that this event lingers into Friday...then maybe another system after this.

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Looks like the NAM and GFS both show the warm front lifting back up into MI on Saturday...NAM has a pretty strong cap. Nocturnal LLJ might help with that though.

EDIT:

I assume we'll just use this thread for the weekend system...

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Tornado watch just issued for portions of the UP, Wisconsin, and Minnesota.

URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 295

NWS STORM PREDICTION CENTER NORMAN OK

225 PM CDT THU MAY 24 2012

THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF

WESTERN AND CENTRAL UPPER MICHIGAN

SOUTHEAST MINNESOTA

NORTHERN AND WESTERN WISCONSIN

LAKE SUPERIOR

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 225 PM UNTIL

1000 PM CDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE

MILES EAST AND WEST OF A LINE FROM 25 MILES SOUTH SOUTHWEST OF LA

CROSSE WISCONSIN TO 40 MILES NORTHEAST OF IRONWOOD MICHIGAN. FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU5).

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...THUNDERSTORMS ARE BEGINNING TO INCREASE IN COVERAGE

ALONG A COLD FRONT FROM SRN MN INTO NRN IA IN RESPONSE TO INCREASING

FORCING AHEAD OF A STRONG SHORT WAVE TROUGH APPROACHING FROM THE

SOUTHWEST. STORMS ARE LIKELY TO INTENSIFY INTO NWRN/WEST CENTRAL WI

THIS AFTERNOON AS A DEEPENING SURFACE LOW MOVES NNEWD ALONG A

PRE-EXISTING THERMAL GRADIENT...WITH ACTIVITY PROGRESSING EWD/NEWD

THROUGH THE EVENING. ALTHOUGH LOW LEVEL MOISTURE IS SOMEWHAT

MARGINAL...STRONG FORCING AND INTENSE VERTICAL SHEAR WILL PROMOTE

DEVELOPMENT OF BOWING LINE SEGMENTS AND OCCASIONAL EMBEDDED

SUPERCELLS WITH ATTENDANT THREATS FOR WIND DAMAGE AND A FEW

TORNADOES.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

450. MEAN STORM MOTION VECTOR 22045.

...WEISS

Probabilities of: 40/10 Tornado, 60/20 Wind, 40/10 Hail

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ARX Damage reports:

0400 PM TSTM WND DMG FOUNTAIN 43.74N 92.13W

05/24/2012 FILLMORE MN TRAINED SPOTTER

UTILITY POLES BLOWN DOWN ON MAIN STREET

0315 PM NON-TSTM WND DMG 1 SW WILTON 43.80N 90.54W

05/24/2012 MONROE WI PUBLIC

CLUSTER OF MAPLE TREES DAMAGED/BLOWN DOWN

0425 PM TSTM WND GST HARMONY 43.56N 92.01W

05/24/2012 M64 MPH FILLMORE MN FIRE DEPT/RESCUE

0450 PM TSTM WND GST HAWKEYE 42.94N 91.95W

05/24/2012 M53 MPH FAYETTE IA EMERGENCY MNGR

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SPC has a the Plains and much of the GL as areas of interest, I guess for Day 4 and Day 5 (Sunday/Monday)

They haven't changed much since I saw them this morning. Make me wonder what the model agreement is on the potential for Severe in this area (NE IL/ SE WI/ NW IN) for Monday/Monday night.

VALID 271200Z - 011200Z ...DISCUSSION... THERE IS INCREASING CONFIDENCE...BASED ON LATEST MODEL GUIDANCE...THAT A STRONG SHORT-WAVE TROUGH WILL EJECT INTO THE HIGH PLAINS EARLY IN THE DAY4 PERIOD...THEN INTO THE UPPER MS VALLEY/GREAT LAKES DAY5. THIS FEATURE SHOULD ERODE THE WARM EML ACROSS MUCH OF THE MIDWEST SUCH THAT STRONG/SEVERE THUNDERSTORMS ARE EXPECTED TO DEVELOP ALONG ADVANCING COLD FRONT. BY LATE IN THE WEEK BOUNDARY LAYER MOISTURE SHOULD BE SUBSTANTIALLY HIGHER THAN CURRENTLY OBSERVED ACROSS THE PLAINS. SRN EXTENT OF ORGANIZED SEVERE EACH OF THESE DAYS IS SOMEWHAT IN QUESTION BUT LIKELY LIMITED BY HEIGHT FALLS THAT SHOULD EXTEND INTO KS/MO. ..DARROW.. 05/24/2012

It will be an interesting end to what is shaping up to be a hot and humid weekend...

post-2790-0-64308700-1337921065_thumb.gi

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When confirmed, the tor that occured in the Wausau, WI area will be the first WI tor of the year.

http://www.crh.noaa....=83220&source=0

Yes it will, and it's been awhile since we've gone at least this long without a tornado (1997, when we didn't get one until June). Plenty of severe weather in the state in the form of damaging winds and hail already this year, though.

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An updated warning from EC Montreal stated that damage caused by a tornado was reported in between Mirabel and Montreal.

That looks like a nasty cell. Drifting towards N VT by the looks of it...

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I'm uneasy about tomorrow. Shortwave riding around the ridge into the area. Warm front in the vicinity. Strong CAPEs, decent hodos, respectable bulk shear. 00z EMC WRF makes for a very ugly evening tomorrow for nrn IL/IN.

http://www.emc.ncep.noaa.gov/mmb/mpyle/spcprod/00/

Not sure it will get that bad, but definitely a bit uneasy.

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I'm uneasy about tomorrow. Shortwave riding around the ridge into the area. Warm front in the vicinity. Strong CAPEs, decent hodos, respectable bulk shear. 00z EMC WRF makes for a very ugly evening tomorrow for nrn IL/IN.

http://www.emc.ncep....yle/spcprod/00/

Not sure it will get that bad, but definitely a bit uneasy.

Interesting... If anything it looks like the soils get a good soaking in this neck of the woods. That would likely shave off a few degrees on Sunday. And slow up the warm front as well.

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