SPC Mar 8, 2018 0600 UTC Day 1 Convective Outlook

By Newsroom America Feeds at 8 Mar 2018

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1143 PM CST Wed Mar 07 2018 Valid 081200Z - 091200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... The risk for thunderstorms appears low across the country today. ...Discussion... As a series of shortwave troughs advance cyclonically around its periphery, a large closed mid/upper low will slowly progress from the Great Lakes towards New England through the period. Related to this evolution, a broad trough across the eastern half of the US will favor offshore/continental low-level trajectories today, with only initial/weak moisture return occurring over southern Texas late Thursday night. Therefore, stable conditions should preclude thunderstorm development east of the Rockies. Farther west, an impulse will de-amplify as it translates eastward from the Pacific Northwest to the northern Rockies today. Cooling mid levels (e.g., 500mb temps around -25 C) may yield weak buoyancy from far eastern Oregon/Washington to the Idaho/Montana border by afternoon, and an isolated strike or two may occur. However, weakening large-scale ascent and a lack of deeper/more substantive instability are forecast to temper overall convective activity. ..Picca/Cook.. 03/08/2018 Read more



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