Mesoscale Discussion 1505 NWS Storm Prediction Center Norman OK 0719 PM CDT Sat Jul 04 2026 Areas affected...Portions of the Mid-Atlantic Concerning...Severe Thunderstorm Watch 457...459... Valid 050019Z - 050215Z The severe weather threat for Severe Thunderstorm Watch 457, 459 continues. SUMMARY...A corridor of higher severe wind potential is emerging from eastern Maryland into Delaware, eastern Pennsylvania, and New Jersey. Wind gusts between 55-70 mph will be possible. DISCUSSION...Over the past hour, two more prominent clusters have emerged across southeast PA and MD with substantial upticks in lightning counts and steadily cooling cloud-top temperatures noted in IR imagery. At the surface, both of these clusters have produced severe wind gusts as they begin to impinge on a warm air mass with steep low-level lapse rates. Although temperatures downstream from these clusters have begun to cool due to the recent loss of daytime heating, temperatures remain in the low to mid 90s with 25-30 F dewpoint depressions noted ahead of the clusters and south of an outflow boundary. Further cooling/stabilization is expected, but maturing cold pools associated with these clusters, coupled with somewhat stronger mid-level flow with north and eastward extent, will likely maintain convective intensities and may promote some degree of intensification over the next couple of hours. Consequently, the potential for strong/severe winds (most likely between 55-70 mph) should be focused downstream into portions of far southeast PA and central/southern NJ - mainly along and south of the outflow boundary. ..Moore.. 07/05/2026 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...OKX...PHI...AKQ...CTP...LWX... LAT...LON 38457608 39437619 39867630 40077625 40287604 40627455 40567416 40377397 40127393 39837400 39617412 39377435 39127463 38977475 38777496 38627497 38427500 38287525 38347563 38387597 38457608 MOST PROBABLE PEAK WIND GUST...55-70 MPH
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