783
ACUS01 KWNS 100538
SWODY1
SPC AC 100536
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1236 AM CDT THU SEP 10 2026
VALID 101200Z - 111200Z
...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM THE
SOUTHERN HIGH PLAINS TO THE SOUTHERN MID-ATLANTIC COAST...
..SUMMARY
SPORADIC DAMAGING WIND GUSTS APPEAR POSSIBLE FROM THE SOUTHERN
PLAINS TO THE SOUTHERN MID-ATLANTIC COAST THURSDAY AFTERNOON AND
EVENING. ISOLATED OCCURRENCES OF LARGE HAIL MAY OCCUR OVER PORTIONS
OF SOUTH-CENTRAL COLORADO INTO NORTHEAST NEW MEXICO AND PERHAPS
PORTIONS OF THE OKLAHOMA AND TEXAS PANHANDLES THURSDAY AFTERNOON AND
EVENING.
..SYNOPSIS
A SHORT-WAVE TROUGH INITIALLY OVER THE UPPER MS AND MID MO VALLEYS
THURSDAY MORNING WILL CONTINUE EAST INTO THE GREAT LAKES AND OH
VALLEY WITH A PRECEDING BELT OF ENHANCED MID-LEVEL FLOW EXTENDING
INTO THE MID-ATLANTIC. ELSEWHERE, A VORTICITY MAXIMUM (POSSIBLE MCV)
IS FORECAST TO PROGRESS FROM WESTERN KS INTO THE OZARK PLATEAU BY
THURSDAY NIGHT. AT THE SURFACE, A COOL FRONT IS EXPECTED TO ADVANCE
THROUGH THE MID-ATLANTIC DURING THE FORECAST PERIOD WITH THE WESTERN
EXTENSION OF THE BOUNDARY SETTLING MORE SLOWLY SOUTH THROUGH THE OH
VALLEY, OZARK PLATEAU, AND SOUTHERN PLAINS. THE LOCATION OF THE
SURFACE FRONT IS LIKELY TO BE MODULATED BY CLUSTERS OF THUNDERSTORMS
THAT ARE EXPECTED TO BE ONGOING THURSDAY MORNING FROM PORTIONS OF
THE OH VALLEY INTO THE SOUTHERN PLAINS.
..SOUTHERN PLAINS TO THE SOUTHERN MID-ATLANTIC COAST
TO THE SOUTH OF RESIDUAL CLOUDINESS AND LINGERING SHOWERS AND
THUNDERSTORMS, A HOT AIR MASS IS EXPECTED TO DEVELOP BY AFTERNOON
WITH TEMPERATURES WELL INTO THE 90S TO AROUND 100 F OVER THE
SOUTHERN PLAINS INTO THE LOWER MS VALLEY, AND UPPER 80S TO MID 90S
FROM THE TN VALLEY TO MID-ATLANTIC. WHILE MID-LEVEL LAPSE RATES WILL
REMAIN GENERALLY LESS THAN 7 C/KM, THE DAYTIME HEATING COUPLED WITH
DEWPOINTS IN THE 60S TO LOW/MID 70S WILL YIELD A MODERATELY UNSTABLE
AIR MASS BY AFTERNOON WITH MLCAPE RANGING FROM 1500-2500+ J/KG.
THE 00Z MODELS INDICATE A GRADUAL INCREASE IN THUNDERSTORM COVERAGE
AND INTENSITY THROUGH THE AFTERNOON, AIDED BY FORCING FOR ASCENT
ASSOCIATED WITH THE MID-LEVEL DISTURBANCES MENTIONED IN THE
SYNOPSIS, AS WELL AS CONVERGENCE ALONG THE SYNOPTIC FRONT AND ANY
EXISTING OUTFLOW BOUNDARIES. THE STRONGEST MID/UPPER-LEVEL WIND
FIELD AND RESULTANT VERTICAL SHEAR ARE EXPECTED TO LARGELY REMAIN TO
THE NORTH OF THE EFFECTIVE WARM SECTOR. HOWEVER, 30-35 KT OF
DEEP-LAYER SHEAR IS FORECAST ALONG THE FRONT OVER PORTIONS OF THE OH
VALLEY INTO THE SOUTHERN MID-ATLANTIC, WHERE SOME STORM ORGANIZATION
APPEARS POSSIBLE WITH THE PRIMARY HAZARD BEING DAMAGING WIND GUSTS.
VERTICAL SHEAR WILL DIMINISH WITH SOUTHWESTWARD EXTENT FROM THE TN
VALLEY INTO THE OK-TX RED RIVER VALLEY; HOWEVER, THE PRESENCE OF A
RELATIVELY DEEP, WELL-MIXED BOUNDARY LAYER WILL BE SUPPORTIVE OF
SPORADIC DAMAGING WINDS WITH ISOLATED SEVERE GUSTS.
..RATON MESA VICINITY
UPSLOPE FLOW OF A MOIST BOUNDARY LAYER BENEATH MID-LEVEL LAPSE RATES
OF 7-8 C/KM WILL YIELD MODERATE AFTERNOON INSTABILITY WITH MLCAPE OF
1000-1500 J/KG. ISOLATED TO WIDELY SCATTERED THUNDERSTORM
DEVELOPMENT IS ANTICIPATED BY MID AFTERNOON ALONG THE HIGH TERRAIN
AMIDST A VERTICALLY VEERING WIND PROFILE WITH UP TO 30-35 KT OF
DEEP-LAYER SHEAR. THE GIVEN ENVIRONMENT WILL BE SUPPORTIVE OF
MULTICELL AND SUPERCELL STORM MODES WITH AN ASSOCIATED RISK FOR
LARGE HAIL.
..MEAD/CHALMERS.. 09/10/2026
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