SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1123 AM CST Thu Dec 24 2020 Valid 251200Z - 261200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... A few lightning flashes may occur over New England Friday, and across portions of the Pacific Northwest Friday night/Saturday morning. ...Discussion... A deep upper low -- and expansive area of surrounding/cyclonic flow -- is forecast to shift eastward across the eastern half of the U.S. this period, with a broad area of ridging to its west. This area of ridging, shifting eastward across the Rockies and Plains during the period, will flatten with time in response to eastern Pacific troughing, that is forecast to weaken but move onshore across the Pacific Northwest during the second half of the period. At the surface, a deep low initially over the St. Lawrence/Ottawa River Valley vicinity will shift northward with time across Quebec. The trailing cold front -- initially extending southward across the Champlain and Hudson Valleys and into the western Atlantic -- will advance across New England through the period. In the West, a weak Pacific cool front will move inland ahead of the upper system. With largely dry/stable conditions expected across the U.S. Friday, little potential for thunderstorm activity is evident. A few lightning flashes may occur over New England, as rain/rain showers spread across the region in advance of the upper trough. A lightning flash or two may also occur over western portions of northern California and Oregon overnight, amidst an area of showers that will move onshore Friday night. Otherwise, thunderstorms are not expected across the CONUS through the period. ..Goss.. 12/24/2020
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