Mesoscale Discussion 1147 NWS Storm Prediction Center Norman OK 0825 PM CDT Sun Jun 14 2026 Areas affected...Parts of the Mid Atlantic Concerning...Severe Thunderstorm Watch 335...337... Valid 150125Z - 150330Z The severe weather threat for Severe Thunderstorm Watch 335, 337 continues. SUMMARY...A threat for strong to locally severe storms will continue into late evening. Damaging wind, isolated hail, and a brief tornado all remain possible. DISCUSSION...An increase in semi-discrete storms has recently been noted from southeast PA into MD and northern VA, with a supercell ongoing as of 0115Z south of Lancaster, PA. The 00Z IAD sounding depicted 45 kt of effective shear and MLCAPE in excess of 1000 J/kg, which will continue to support supercell potential with the strongest storms through the evening. Damaging wind, isolated hail, and perhaps a brief tornado could accompany any sustained supercell. This developing cluster of storms may eventually spread into parts of DE and NJ with a continued severe risk. Farther west, a line of storms associated with a cold front is moving eastward across central PA, with occasional wind-damage reports and observed gusts of generally 50-60 mph. This line may continue to pose a threat of wind damage in the short term as it moves eastward, though some continued weakening is expected with time later through the evening. ..Dean.. 06/15/2026 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...OKX...ALY...PHI...BGM...AKQ...CTP...LWX... LAT...LON 40687422 38097549 38657612 39047701 39727785 40097764 40507742 40827714 41397672 42117596 42107531 42127468 41617425 40687422 MOST PROBABLE PEAK TORNADO INTENSITY...85-110 MPH MOST PROBABLE PEAK WIND GUST...55-70 MPH MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 IN
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