671
ACUS11 KWNS 011731
SWOMCD
SPC MCD 011731
KYZ000-OHZ000-TNZ000-INZ000-012000-
MESOSCALE DISCUSSION 1816
NWS STORM PREDICTION CENTER NORMAN OK
1231 PM CDT SAT AUG 01 2026
AREAS AFFECTED...PORTIONS OF SOUTHERN INDIANA AND OHIO INTO CENTRAL
KENTUCKY AND MIDDLE TENNESSEE
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 011731Z - 012000Z
PROBABILITY OF WATCH ISSUANCE...40 PERCENT
SUMMARY...SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP AHEAD OF A
COLD FRONT AND SURFACE CYCLONE THIS AFTERNOON ACROSS THE OH/TN
VALLEYS. A MIXED MODE OF CLUSTERS AND SUPERCELL STRUCTURES COULD
POSE A RISK FOR DAMAGING GUSTS AND A COUPLE OF TORNADOES. A WW IS
POSSIBLE, BUT UNCERTAIN.
DISCUSSION...AS OF 1730 UTC VISIBLE AND RADAR IMAGERY SHOWED SHOWERS
AND INCIPIENT THUNDERSTORMS INTENSIFYING ALONG A BROAD FRONTAL ZONE
OVER THE LOWER OH VALLEY. DIFFUSE HEATING AMID LINGERING CLOUDS
AHEAD OF THE FRONT AND OCCLUDED SURFACE CYCLONE HAVE RAISED SURFACE
TEMPERATURES INTO UPPER 70S TO LOW 80S F IN A VERY MOIST SURFACE AIR
MASS. WHILE OVERALL LAPSE RATE PROFILES ARE MODEST, THE HEATING AND
WEAK ASCENT FROM THE ASSOCIATE UPPER LOW OVERSPREADING THE AREA IS
SUPPORTING CONTINUING DESTABILIZATION THIS AFTERNOON WITH MLCAPE OF
1000-2000 J/KG EXPECTED. STORM COVERAGE IS FORECAST TO INCREASE FROM
IN, SOUTHWARD ACROSS KY AND INTO PARTS OF OH AND MIDDLE TN THIS
AFTERNOON.
A BELT OF STRONGER WESTERLY FLOW ALOFT IS SUPPORTING 30-35 KT OF
EFFECTIVE SHEAR AND MODEST LOW-LEVEL HODOGRAPH CURVATURE EVIDENT ON
AREA VADS. THIS SUGGESTS A MIX OF ORGANIZED MULTICELLS AND TRANSIENT
SUPERCELL STRUCTURES IS LIKELY. THE HIGH PWATS WILL FAVOR
WATER-LOADING OF THE DOWNDRAFTS AND SOME DAMAGING GUSTS POTENTIAL,
ESPECIALLY FOR CELLS THAT CAN CLUSTER.
THE TORNADO RISK IS LESS CLEAR, BUT FOCUSED LOW-LEVEL BUOYANCY,
PLENTIFUL AMBIENT VERTICAL VORTICITY AND 0-500M SRH OF 75-150 M2/S2
COULD SUPPORT A COUPLE OF TORNADOES WITH ANY POTENTIAL SUPERCELLS.
THIS COULD BE LOCALLY FOCUSED WHERE THE MOST ROBUST SURFACE HEATING
IS OCCURRING, AND WHERE LOW-LEVEL FLOW REMAINS BACKED ALONG PORTIONS
OF THE OH RIVER IN SOUTHERN IN NORTHERN KY AND SOUTHWEST OH.
GIVEN THE EXPECTED INCREASE IN THUNDERSTORMS WITH SOME RISK FOR
DAMAGING GUSTS AND A COUPLE TORNADOES, A WW IS BEING CONSIDERED.
HOWEVER, THE LINGERING CLOUD COVER AND NEBULOUS FORCING LEND LOW
CONFIDENCE ON TIMING AND WHERE THE GREATEST THREAT MAY OCCUR.
..LYONS/MOSIER.. 08/01/2026
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT
ATTN...WFO...MRX...JKL...ILN...LMK...OHX...IND...HUN...PAH...
LAT...LON 36858729 37988686 39268683 39898709 40288654 40148524
39888472 39588406 39168359 38728340 37508392 36758446
36118485 35668535 35308604 35128680 35078728 35308773
35548775 36858729
MOST PROBABLE PEAK TORNADO INTENSITY...85-110 MPH
MOST PROBABLE PEAK WIND GUST...55-70 MPH
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