SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1159 AM CDT Thu Mar 20 2025 Valid 211200Z - 221200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not expected Friday. ...Mid-MO/MS Valleys... A compact shortwave impulse currently over the northern Rockies will progress across parts of the Mid-MO/MS Valleys Friday. Despite a dearth of low-level moisture, diurnally steepening lapse rates along with a focused corridor of moderate large-scale ascent should support a swath of isolated to scattered low-topped convection, primarily from late morning to early evening. Meager buoyancy should be adequate for sporadic lightning. Gusty, sub-severe winds may accompany this activity, especially across the southern portion of the convective threat, owing to a deeper mixed boundary layer and 30-40 kt 850-mb westerlies. ...Northwest... The next shortwave trough will move inland of the Pacific Northwest coast and reach the northern Rockies by Friday night. Scattered low-topped convection should accompany this wave within a confined belt of stronger forcing for ascent coincident with scant buoyancy at most. Isolated thunderstorms are possible near the Cascades on Friday afternoon, shifting east across the Columbia Basin and into the northern Rockies through late evening. ..Grams.. 03/20/2025