SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0727 AM CDT Tue Oct 13 2020 Valid 131300Z - 141200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not expected across the contiguous United States through tonight. ...Synopsis... Fast/low-amplitude flow aloft is progged across roughly the northern half of the U.S. today, as several embedded short-wave troughs will progress rapidly eastward across the northern tier of the country. At the surface, a weakening cold front -- trailing from a deeply occluded low over the northern Manitoba vicinity -- will continue sweeping eastward across the eastern seaboard. This front will eventually overtake a weak low just off the Mid Atlantic coast, with the low then moving northward along the front across coastal New England, as the boundary gradually works offshore. Farther west, a weak low is forecast to shift east-southeastward out of the Canadian Rockies and across the northern Intermountain region, in conjunction with one of the aforementioned upper short-wave troughs. As this northwestern U.S. low -- and associated upper system -- advances, showers and possibly a few thunderstorms will occur -- from Washington State into Montana. Showers and a few embedded thunderstorms are also expected over portions of the Northeast, in the vicinity of the advancing cold front/frontal low. Elsewhere, appreciable lightning is not expected. ..Goss.. 10/13/2020
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