SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1129 AM CST Sun Nov 01 2020 Valid 021200Z - 031200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not forecast across the contiguous United States on Monday. ...Discussion... A slowly progressive upper flow pattern is forecast over the U.S. Monday, as an eastern U.S. trough moves into the western Atlantic and Canadian Maritimes, while ridging persists over much of the western and into the central portion of the country. With time, the western ridge is expected to deamplify however, as a weak upper low moves across California and into Nevada, and a short-wave trough embedded in the northern stream approaches the Pacific Northwest later in the period. With surface high pressure -- and associated dry/stable air -- prevailing over much of the country in the wake of strong eastern U.S. cold-frontal passage, little risk for thunderstorms is evident. One exception will be over a portion over the Desert Southwest/lower Colorado River Valley area. Here, relatively steep lapse rates aloft combined with weak large-scale ascent associated with the aforementioned upper low may result in a few lightning flashes emanating from high-based updrafts -- particularly during the afternoon hours. Elsewhere, thunderstorms are not expected across the remainder of the country. ..Goss.. 11/01/2020
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