SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0659 AM CST Wed Nov 18 2020 Valid 181300Z - 191200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not expected today through tonight. ...Synopsis/Discussion... A progressive large-scale flow pattern will continue through tonight/early Thursday. With mean troughing over the Pacific Northwest and northern Rockies, adequate moisture and steep lapse rates will support a relatively long duration of isolated thunderstorm potential in/near coastal portions of Washington/Oregon and northern California today into this evening. Additionally, the potential for a few thunderstorms will extend eastward into eastern Washington/eastern Oregon and Idaho this afternoon and early evening as an embedded shortwave trough crosses over the region and as weak buoyancy is diurnally maximized. Elsewhere, upper ridging and associated high pressure across the eastern half of the CONUS will preclude thunderstorms east of the Rockies. ..Guyer/Leitman.. 11/18/2020
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