SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1156 AM CDT Tue Sep 29 2020 Valid 301200Z - 011200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not expected Wednesday. ...Synopsis... A large-scale upper trough will persist over much of the CONUS east of the Rockies on Wednesday. A shortwave trough embedded within this larger-scale system is forecast to extend from the Mid-Atlantic vicinity into FL early Wednesday, and lift northeastward through the period. A surface cold front attendant to a low over New England and Quebec will extend from VT/NH into eastern MA/CT southward to the offshore waters along the Atlantic coast before intersecting southern FL. Moist and unstable conditions could result in isolated thunderstorms across southern FL, though weak shear and poor midlevel lapse rates will preclude severe thunderstorm potential. A couple of thunderstorms may be ongoing near Cape Cod for an hour or two at the very start of the period, but the cold front will quickly shift east and push any activity offshore. Otherwise, cold temperatures aloft will result in steep midlevel lapse rates across the Great Lakes region, promoting weak destabilization during the afternoon/early evening. Weak instability, combined with moderate to strong mid/upper flow and forcing for ascent streaming across the region as the upper trough pivots eastward, could result in a few weak thunderstorms from the Lake Michigan vicinity eastward to western NY. ..Leitman.. 09/29/2020
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