MESO: Mesoscale Discussion 1044

ACUS11 KWNS 122107
SWOMCD
SPC MCD 122106
WIZ000-ILZ000-IAZ000-MNZ000-122200-

MESOSCALE DISCUSSION 1044
NWS STORM PREDICTION CENTER NORMAN OK
0406 PM CDT WED JUN 12 2013

AREAS AFFECTED...NERN IA...EXTREME SERN MN...SWRN WI...NWRN IL

CONCERNING...TORNADO WATCH 298...

VALID 122106Z - 122200Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 298 CONTINUES.

SUMMARY...THE THREAT FOR TORNADOES...DAMAGING WINDS AND LARGE HAIL
CONTINUES ACROSS WW...WHICH WAS RECENTLY EXTENDED EWD BY WFO
CHICAGO.

DISCUSSION...A FRONTAL BOUNDARY EXTENDS FROM NERN IA ACROSS NWRN
IL...AND INTERSECTS A LAKE BREEZE BOUNDARY NEAR CHICAGO. A SURFACE
LOW WAS LOCATED ALONG THIS FRONT OVER CENTRAL/NERN IA...AND THIS LOW
WILL MOVE EWD ACROSS THE WATCH AREA INTO NRN IL BY EARLY EVENING.
SUPERCELL SVR TSTMS OVER NRN IL WILL CONTINUE TO POSE A TORNADO
THREAT...ALONG WITH LARGE HAIL/DAMAGING WINDS GIVEN STRONG DEEP
LAYER SHEAR AND 0-3 KM SRH OF AROUND 200 M2/S2. STORMS INTERACTING
WITH WWD-MOVING LAKE BREEZE MAY BRIEFLY ENCOUNTER HIGHER LOW-LEVEL
SRH OVER NRN IL BEFORE UPSCALE GROWTH OCCURS. SVR TSTMS OVER SWRN WI
ARE IN A REGION OF BACKED LOW-LEVEL FLOW AND WILL ALSO POSE A
TORNADO THREAT OVER THE NEXT FEW HOURS.

TSTMS OVER WRN PORTIONS OF THE WW AREA HAVE BEEN SLOW TO
DEVELOP...HOWEVER A FUNNEL CLOUD WAS REPORTED IN FRANKLIN COUNTY AT
2029Z. ADDITIONAL DEVELOPMENT IS EXPECTED AS LARGE-SCALE FORCING
CONTINUES TO OVERSPREAD THE AREA.

..BUNTING/CARBIN.. 06/12/2013

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...LOT...ILX...MKX...DVN...ARX...MPX...DMX...

LAT...LON 43789277 43619109 43458982 42958863 42718831 42218831
41178829 41098918 41549147 41929246 42349362 42769394
43249386 43839361 43789277

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