137
ACUS11 KWNS 180250
SWOMCD
SPC MCD 180250
IAZ000-180415-
MESOSCALE DISCUSSION 0464
NWS STORM PREDICTION CENTER NORMAN OK
0950 PM CDT THU APR 17 2025
AREAS AFFECTED...SOUTHERN IOWA
CONCERNING...TORNADO WATCH 141...
VALID 180250Z - 180415Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 141 CONTINUES.
SUMMARY...THE SEVERE THREAT WILL CONTINUE FOR ANOTHER HOUR OR TWO.
DISCUSSION...TWO MATURE SUPERCELLS CONTINUE TO MOVE ACROSS SOUTHERN
IOWA. THESE SUPERCELLS HAVE NOW TRANSITED THE BEST LOW-LEVEL
MOISTURE AND ARE MOVING TOWARD LESSER INSTABILITY. IN ADDITION,
BOUNDARY LAYER COOLING WILL CONTINUE TO INCREASE SURFACE BASED
INHIBITION THIS EVENING AND INTO THE OVERNIGHT HOURS. THE
INCREASINGLY HOSTILE THERMODYNAMIC ENVIRONMENT SHOULD EVENTUALLY
BRING AN END TO THE SEVERE WEATHER THREAT WITHIN THE NEXT HOUR OR
TWO ACROSS SOUTHERN IOWA. IN THE MEANTIME, LARGE HAIL, SEVERE WIND
GUSTS, AND PERHAPS A TORNADO REMAIN POSSIBLE THREATS WITH THESE
SUPERCELLS AS THEIR STRONG MID-LEVEL PRESSURE PERTURBATIONS PERMIT
THEM TO PERSIST DESPITE THE AFOREMENTIONED UNFAVORABLE CONDITIONS.
..BENTLEY.. 04/18/2025
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT
ATTN...WFO...DMX...OAX...
LAT...LON 40769367 40769404 40779474 40859506 41099495 41459454
41509326 40849309 40769367
MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 95 MPH
MOST PROBABLE PEAK WIND GUST...55-70 MPH
MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN
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