SPC Nov 12, 2017 0830 UTC Day 3 Severe Thunderstorm Outlook

By Newsroom America Feeds at 12 Nov 01:52

SPC 0830Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 1250 AM CST Sun Nov 12 2017 Valid 141200Z - 151200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe storms are not expected across the U.S. Tuesday. ...Synopsis... Low-amplitude flow aloft will continue across the U.S., though some amplification of the flow will occur later in the period over the northwestern and north-central U.S. as a low over the northeastern Pacific digs south-southeast toward the Pacific Northwest Coast. As this feature digs, some strengthening of downstream ridging over the Canadian Rockies and northern Intermountain Region will occur. Still farther downstream, a short-wave trough exiting the Rockies and moving quickly across the Canadian Prairies/north-central U.S. will likewise amplify slightly in response. At the surface, high pressure will persist over the east, though a cold front associated with the aforementioned north-central U.S. upper trough will advance eastward across the Plains. Meanwhile, a second cold front will approach the Pacific Northwest Coast late in the period, in conjunction with the digging northeastern Pacific low. Showers and possibly occasional/embedded lightning strikes are expected near Pacific Northwest coastal areas, while showers and the possibility for a thunderstorm or two will persist across Florida. Finally, elevated convection -- including a few thunderstorms -- may evolve late in the period in the vicinity the lower Missouri/lower Ohio/mid Mississippi Valleys, as low-level warm advection increases ahead of the advancing surface cold front. In all areas however, severe weather is not anticipated. ..Goss.. 11/12/2017 Read more



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