


Severe Storm Outlook Narrative (AC)
Issued by NWS
Issued by NWS
745 ACUS03 KWNS 121900 SWODY3 SPC AC 121859 Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0159 PM CDT Sat Jul 12 2025 Valid 141200Z - 151200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS OVER PARTS OF THE NORTHERN PLAINS... ...SUMMARY... Isolated strong to severe thunderstorms are possible across portions of the northern Plains Monday evening. ...Synopsis and Discussion... A belt of moderate flow aloft will generally extend eastward along U.S./Canadian border on Monday, with weaker flow and higher heights across the remainder of the CONUS. Models do depict a positive-tilt trough dropping south across the Pacific Northwest and into MT, with increasing large-scale ascent favoring increasing rain and thunderstorm chances late. A surface trough will deepen from eastern WA into southern MT and into western SD late Monday, ahead of the elongated west-east oriented cold front. Dewpoints in the 50s F will exist both near and behind the front from central MT into the Dakotas, contributing to MUCAPE over 1000 J/kg. Weak to moderate deep-layer effective shear near the front may yield a few storms capable of severe gusts as activity pushes south into the heated air mass south of the boundary. Otherwise, elevated/marginal hail may occur as well. A nocturnal low-level jet may support strong to locally severe storms into parts of northern MN overnight. Elsewhere, an expansive area of low-level moisture will remain from the Plains to the East coast, beneath generally weak flow aloft. This will support scattered storms, though any severe wind potential should be quite localized. ..Jewell.. 07/12/2025 $$