898
ACUS11 KWNS 152033
SWOMCD
SPC MCD 152032
ILZ000-WIZ000-IAZ000-152200-
MESOSCALE DISCUSSION 1953
NWS STORM PREDICTION CENTER NORMAN OK
0332 PM CDT FRI AUG 15 2025
AREAS AFFECTED...CENTRAL/EASTERN IA AND ADJACENT WI/IL
CONCERNING...SEVERE THUNDERSTORM WATCH 589...590...
VALID 152032Z - 152200Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 589, 590
CONTINUES.
SUMMARY...SPORADIC SEVERE WIND/HAIL WILL REMAIN POSSIBLE THROUGH
EARLY EVENING AS A LINEAR CLUSTER MOVES EAST-SOUTHEAST FROM
NORTH-CENTRAL IOWA.
DISCUSSION...A SHORT AND GENERALLY WEST-SOUTHWEST/EAST-NORTHEAST
ORIENTED LINEAR CLUSTER HAS BEEN PROGRESSING EAST-SOUTHEAST AT
AROUND 35-40 KTS. THE TEMPERATURE GRADIENT BETWEEN THE COLD POOL AND
THE AMBIENT WARM-MOIST SECTOR DOWNSTREAM HAS INCREASED TO 15-20 F.
STRONG/NEAR-SEVERE GUSTS PRODUCING LOCALIZED TREE DAMAGE ALONG WITH
MARGINALLY SEVERE HAIL HAVE BEEN RECENTLY REPORTED, AND SHOULD
CONTINUE FOR AT LEAST A FEW MORE HOURS, ESPECIALLY ON THE
EASTWARD-PROPAGATING PORTION OF THE CLUSTER. OUTFLOW IS LARGELY
AHEAD OF THE TRAILING WESTWARD PORTION, BUT NOT STRONGLY SURGING, SO
THERE IS POSSIBILITY FOR A BOWING SEGMENT TO SURGE SOUTHEASTWARD.
ONGOING SEVERE THUNDERSTORM WATCHES APPEAR TO WELL HANDLE THE
OVERALL THREAT, BUT SOME REFINEMENT COULD BE NEEDED BASED ON
CONVECTIVE TRENDS OVER THE NEXT 1-2 HOURS.
..GRAMS.. 08/15/2025
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT
ATTN...WFO...LOT...MKX...DVN...ARX...DMX...
LAT...LON 43189253 43299205 43349145 43289093 42919027 42468979
42058958 41668985 41599037 41469079 41659263 41779373
42209405 42449404 42579312 42659281 43189253
MOST PROBABLE PEAK WIND GUST...55-70 MPH
MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN
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