Flash Flood Guidance
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Issued by NWS
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850 AWUS01 KWNH 080410 FFGMPD WVZ000-OHZ000-KYZ000-INZ000-ILZ000-081008- Mesoscale Precipitation Discussion 0238 NWS Weather Prediction Center College Park MD 1209 AM EDT Wed May 08 2024 Areas affected...northern Kentucky, southern Ohio, southern Indiana, far western West Virginia Concerning...Heavy rainfall...Flash flooding likely Valid 080408Z - 081008Z Summary...A focused band of training convection was producing spots of 1 inch/hr and 2-3 inch/3-hr rain rates especially across southern Ohio. The heavy rainfall will likely result in at least isolated instances of flash flooding across the discussion area through 10Z. Discussion...Training convection has materialized along an axis generally extending from Cincinnati to Bloomington, IN over the past couple hours. The orientation of the convection is favorably parallel to steering flow aloft to promote areas of training and heavier rainfall even as the band begins to very slowly shift southward over time. Updrafts within the convective band are being supported by appreciable (40kt) southwesterly low-level flow) and a very moist/unstable airmass characterized by 1.5 inch PW values and 1500-3000 J/kg MLCAPE - highest with southwestward extent across southern Indiana. Rain rates within this band have been in the 1-1.5 inch/hr range and 2-3 inch/3-hr range. These rates are expected to continue - even as the convective band migrates slowly south through 10Z. These rates will also threaten FFG thresholds across the region, which are as low as 1-1.5 inch/3-hr across northern Kentucky and West Virginia. Given the ongoing scenario, flash flooding is likely to occur in a few areas across the discussion area, and a special update to the excessive rainfall outlook has been disseminated with an upgrade to Slight Risk for the general area. Cook ...Please see www.wpc.ncep.noaa.gov for graphic product... ATTN...WFO...ILN...ILX...IND...JKL...LMK...PAH...RLX...RNK... ATTN...RFC...OHRFC...NWC... LAT...LON 39728334 39588193 39238092 38448067 37828095 37688255 37588383 37488627 37548756 38148787 39178750 39368650 39688484