200
ACUS03 KWNS 070636
SWODY3
SPC AC 070635
DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0135 AM CDT MON SEP 07 2026
VALID 091200Z - 101200Z
...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS
OF THE MIDWEST...
..SUMMARY
ISOLATED STRONG TO SEVERE THUNDERSTORMS ARE POSSIBLE ACROSS PORTIONS
OF THE MIDWEST ON WEDNESDAY.
..MIDWEST
AN UPPER TROUGH WILL PROGRESS EASTWARD ACROSS THE GREAT LAKES ON
WEDNESDAY, BRINGING ENHANCED WESTERLY FLOW OVER THE REGION. AT THE
SURFACE, A COLD FRONT WILL SHIFT SOUTHEAST THROUGH THE PERIOD,
BECOMING POSITIONED FROM THE UPPER OHIO VALLEY TO THE TX PANHANDLE
BY THURSDAY MORNING. AHEAD OF THE FRONT, A MOIST AIRMASS WILL BE IN
PLACE. MIDLEVEL LAPSE RATES ARE NOT FORECAST TO BE PARTICULARLY
STEEP, BUT POCKETS OF WEAK TO MODERATE INSTABILITY ARE FORECAST,
PARTICULARLY ACROSS THE LOWER MO VALLEY INTO OH. MORNING SHOWERS AND
THUNDERSTORMS WILL LIKELY BE ONGOING NEAR AND NORTH OF THE COLD
FRONT FROM IOWA INTO LOWER MI. AS THE FRONT PROGRESSES SOUTHEAST
THROUGH THE AFTERNOON AND EVENING, ADDITIONAL THUNDERSTORM
DEVELOPMENT IS EXPECTED ACROSS THE DESTABILIZING WARM SECTOR.
DEEP-LAYER FLOW IS EXPECTED TO LARGELY REMAIN PARALLEL TO THE
SURFACE BOUNDARY. THIS ENVIRONMENT SHOULD LARGELY FAVOR A MORE
LINEAR STORM MODE AND CONVECTION COULD BECOME UNDERCUT BY THE FRONT.
NEVERTHELESS, VERTICAL SHEAR WILL BE SUFFICIENT FOR ORGANIZED
CONVECTION AND DAMAGING WINDS APPEAR POSSIBLE WITHIN CORRIDORS OF
GREATER INSTABILITY INTO WEDNESDAY EVENING/EARLY THURSDAY.
..LEITMAN.. 09/07/2026
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