314
ACUS11 KWNS 091230
SWOMCD
SPC MCD 091229
WIZ000-IAZ000-MNZ000-NEZ000-091430-
MESOSCALE DISCUSSION 1911
NWS STORM PREDICTION CENTER NORMAN OK
0729 AM CDT SAT AUG 09 2025
AREAS AFFECTED...PORTIONS OF IA INTO SOUTHEAST MN AND FAR
WEST-CENTRAL WI
CONCERNING...SEVERE THUNDERSTORM WATCH 580...
VALID 091229Z - 091430Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 580
CONTINUES.
SUMMARY...SEVERE THUNDERSTORMS PRODUCING DAMAGING WIND GUSTS WILL
PERSIST ACROSS PORTIONS OF WESTERN INTO NORTH-CENTRAL IOWA THIS
MORNING.
DISCUSSION...SEVERE GUSTS CONTINUE WITH THE CLUSTER OF STORMS
ONGOING ACROSS WEST-CENTRAL IA THIS MORNING. RADAR TRENDS HAVE SHOWN
SOME DOWNWARD TREND IN VELOCITY STRENGTH AS WELL AS A SOMEWHAT MORE
DISORGANIZED PRESENTATION IN REFLECTIVITY. NEVERTHELESS, MEASURED
SEVERE GUSTS AND WIND DAMAGE REPORTS CONTINUE AS CONVECTION DEVELOPS
NORTHEAST ALONG/JUST AHEAD OF A SURFACE COLD FRONT.
THE DOWNSTREAM AIRMASS REMAINS STRONGLY UNSTABLE, AND CONVECTION
WILL PERSIST ALONG THE LENGTH OF THE SURFACE FRONT FROM WEST-CENTRAL
WI INTO SOUTHEAST MN AND NORTHERN/WESTERN IA. THE CORE OF THE
LOW-LEVEL JET REMAINS CENTERED JUST EAST OF ONGOING STORMS, AND
STRONGER VERTICAL SHEAR TENDS TO LAG BEHIND THE SURFACE BOUNDARY.
CONVECTION ALONG THE FRONT IN MN/WI HAS LARGELY BEEN UNPRODUCTIVE
OVERNIGHT. WHILE STRONG TO SEVERE GUSTS REMAIN POSSIBLE IN THE SHORT
TERM ACROSS IA, IT IS UNCLEAR IF SEVERE POTENTIAL AND A DOWNSTREAM
WATCH WILL BE NEEDED INTO MN/WI.
..LEITMAN.. 08/09/2025
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT
ATTN...WFO...ARX...MPX...DMX...FSD...OAX...
LAT...LON 42209589 43369401 44109232 44219166 44139112 43929084
43649094 42089297 41699356 41289449 41359542 41519595
41799610 42209589
MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 95 MPH
MOST PROBABLE PEAK WIND GUST...65-80 MPH
MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN
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