SWOMCD
SPC MCD 262214
WIZ000-ILZ000-IAZ000-262315-
MESOSCALE DISCUSSION 0586
NWS STORM PREDICTION CENTER NORMAN OK
0514 PM CDT SUN APR 26 2009
AREAS AFFECTED...ERN/NERN IA...SWRN WI...EXTREME NWRN IL
CONCERNING...TORNADO WATCH 194...
VALID 262214Z - 262315Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 194 CONTINUES.
STRONG TO SEVERE THUNDERSTORMS ARE POSSIBLE OVER ERN/NERN IA...SWRN
WI...AND EXTREME NWRN IL DURING THE LATE AFTERNOON AND EVENING.
RECENT TRENDS IN SURFACE OBSERVATIONS INDICATE STRENGTHENING
PRESSURE FALLS OVER THE REGION...POSSIBLY OCCURRING IN RESPONSE TO A
S/W TROUGH EJECTING N-NEWD THROUGH THE NRN PLAINS COMBINED WITH
INCREASING LOW LVL WAA ASSOCIATED WITH 30-40 KT LLJ. SURFACE LOW
PRESSURE HAS ADVANCED INTO NWRN IA/SWRN MN IN RESPONSE TO INCREASING
ASCENT...WHILE LOW LVL THETA-E ADVECTION IS OCCURRING TO ITS EAST
ALONG A NWD RETREATING WARM FRONT. RESULTANT DESTABILIZATION HAS
FAVORED AN INCREASE IN STORM INTENSITY DURING THE LAST HR WITH
ACTIVITY MOVING EAST OVER NERN IA. AREA VWP/S SHOW FAVORABLE
HODOGRAPH STRUCTURE FOR SUPERCELLS...WITH 0-1 KM BULK SHEAR AROUND
30-40 KT AND 0-6 KM BULK SHEAR OF 40-50 KT. THIS ENVIRONMENT MAY
SUPPORT A THREAT OF LARGE HAIL/DAMAGING WINDS IN ADDITION TO AN
ISOLATED TORNADO.
..GARNER.. 04/26/2009
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LOT...MKX...DVN...ARX...
LAT...LON 42478882 42119015 42169133 42929150 43429093 43519012
43118901 42478882
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