ZCZC SPCSWOMCD ALL ACUS11 KWNS 142246 SPC MCD 142246 PAZ000-WVZ000-OHZ000-150015- Mesoscale Discussion 0436 NWS Storm Prediction Center Norman OK 0546 PM CDT Sun Apr 14 2024 Areas affected...Eastern OH into much of PA Concerning...Severe Thunderstorm Watch 108... Valid 142246Z - 150015Z The severe weather threat for Severe Thunderstorm Watch 108 continues. SUMMARY...Thunderstorm wind gusts of 60-70 mph and isolated severe hail remain possible this evening. DISCUSSION...Despite limited low-level moisture, seasonably strong diurnal heating beneath cold temperatures aloft has resulted in the development of extensive deep convection from northeast OH into much of northern PA. The strongest storms are ongoing this evening across western PA, where somewhat more favorable low-level moisture (coincident with a cumulus field across northeast OH) is feeding in from the west. A 68 mph gust at KYNG was noted earlier, and a combination of relatively strong low-level flow and a deep, well-mixed boundary later will continue to support a threat of wind gusts of up to 60-70 mph through early evening. Steep lapse rates will continue to support an isolated hail threat, especially with storms ongoing along the western end of the ongoing QLCS, where somewhat greater instability in place and there will be less of a tendency for storm interference. Some backbuilding into eastern OH will be possible over the next 1-2 hours, before nocturnal cooling/stabilization begins to diminish the threat. Farther east into central/eastern PA, instability is somewhat weaker, but a threat for damaging winds will accompany the strongest storms, especially in areas where stronger heating/mixing occurred earlier today. A gradual weakening trend is expected later this evening, but some threat for localized damaging winds will persist for as long as vigorous convection (and its related outflow) can be sustained as it moves east-southeastward. Depending on convective trends, local extension of WW 108 may be needed, but additional downstream watch issuance currently appears unlikely. ..Dean.. 04/14/2024 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...PHI...BGM...CTP...PBZ...CLE... LAT...LON 41318148 41117892 41547615 41527572 41217543 40807547 40297815 40257981 40308068 40468149 40618165 41318148 NNNN