Mesoscale Discussion 1701 NWS Storm Prediction Center Norman OK 0602 PM CDT Tue Jul 21 2026 Areas affected...West Virginia...far southeast Ohio...and far northeast Kentucky Concerning...Severe Thunderstorm Watch 506... Valid 212302Z - 220000Z The severe weather threat for Severe Thunderstorm Watch 506 continues. SUMMARY...The threat for damaging winds and perhaps a brief tornado may persist beyond the 00Z watch expiration. A local watch extension may be required. DISCUSSION...As of 2255Z, KRLX radar imagery showed a west-northwest- to east-southeast-oriented band of strong thunderstorms across portions of Gilmer, Lewis, Upshur, and Randolph Counties with a storm motion of 296/33 kt. Over time, the line of storms has become increasingly aligned with the deep-layer shear vectors, which may tend to limit the damaging wind potential to the eastern end of the line. To the immediate west of Charleston, WV, semi-discrete storm structures exhibiting periodic rotation are embedded within a broader shield of weaker convection. The KRLX VWP, which is sampling 0-1 km SRH of 200-250 m2/s2 and 0-6 km bulk shear of around 50 kt, is likely quite representative of both regimes. However, widespread clouds, convectively processed air, and resultant weak low-level lapse rates may offset the otherwise favorable kinematic environment to some extent. Nonetheless, at least an isolated severe weather threat may persist beyond the scheduled watch expiration, mainly in the form of damaging winds. As such, some counties may need to be either extended in time or added to the more recently issued Severe Thunderstorm Watch 510 prior to 00Z. ..Mead.. 07/21/2026 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...RNK...PBZ...RLX... LAT...LON 38028099 38078163 38088228 38188266 38968250 39498184 39408072 39107950 38617969 38377995 38368036 38028099 MOST PROBABLE PEAK TORNADO INTENSITY...85-110 MPH MOST PROBABLE PEAK WIND GUST...55-70 MPH MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN
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