685
ACUS11 KWNS 012327
SWOMCD
SPC MCD 012326
IAZ000-SDZ000-NEZ000-020130-
MESOSCALE DISCUSSION 2190
NWS STORM PREDICTION CENTER NORMAN OK
0626 PM CDT TUE SEP 01 2026
AREAS AFFECTED...SOUTHEAST SD AND NORTHEAST NE
CONCERNING...SEVERE THUNDERSTORM WATCH 639...
VALID 012326Z - 020130Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 639
CONTINUES.
SUMMARY...LARGE HAIL GREATER THAN 2 INCH DIAMETER AND SEVERE WIND
GUSTS REMAIN POSSIBLE ACROSS SEVERE THUNDERSTORM WATCH 639.
CLUSTERING/UPSCALE GROWTH COULD INCREASE DAMAGING WIND POTENTIAL
OVER THE NEXT COUPLE OF HOURS.
DISCUSSION...ISOLATED SUPERCELL STORMS HAVE PRODUCE VERY LARGE HAIL
AND SEVERE WIND GUSTS OVER THE PAST 1-2 HOURS NEAR THE SD/NE BORDER
WITHIN SEVERE THUNDERSTORM WATCH 639. CONTINUED THUNDERSTORM
DEVELOPMENT ALONG A LOW-LEVEL CONVERGENCE ZONE IS RESULTING IN
CLUSTERING THIS EVENING AS CONVECTIVE MODE BECOMES SOMEWHAT MESSIER
VIA STORM INTERACTIONS. STORMS THAT CAN REMAIN MORE DISCRETE WILL
LIKELY REMAIN SUPERCELLS CAPABLE OF PRODUCING VERY LARGE HAIL AND
SEVERE WIND GUSTS. IF SUFFICIENT CLUSTERING AND CONSOLIDATION OF
OUTFLOWS OCCURS, A FORWARD PROPAGATING BOW OR SMALL MCS MAY DEVELOP
IN THE NEXT COUPLE OF HOURS ON THE NORTHWEST PERIPHERY OF AN
DEVELOPING SOUTHWESTERLY LOW-LEVEL JET ACROSS THE MID-MO VALLEY. IF
THIS OCCURS, DAMAGING WIND POTENTIAL COULD INCREASE ACROSS PARTS OF
SOUTHEAST SD/NORTHEAST NE OVER THE NEXT COUPLE OF HOURS.
..LEITMAN.. 09/01/2026
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT
ATTN...WFO...FSD...OAX...LBF...
LAT...LON 43459907 43789715 43689652 43289637 42719644 42299769
42059926 42189969 42649965 43309936 43459907
MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 90 MPH
MOST PROBABLE PEAK WIND GUST...65-80 MPH
MOST PROBABLE PEAK HAIL SIZE...1.50-2.50 IN
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