SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1118 AM CST Tue Dec 16 2025 Valid 171200Z - 181200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms are possible over much of the northern Rockies on Wednesday, with a greater probability across the Texas Coastal Plain. Sporadic activity may also occur Wednesday night into the mid to lower Mississippi Valley. Severe storms are not forecast. ...Synopsis... A strong upper trough and cold front will move across the Pacific Northwest and northern Rockies on Wednesday, with substantial cooling aloft and strong winds. Daytime heating will lead to areas of weak instability, with scattered lightning possible especially over ID and western MT/WY. Overnight, a strong cold front will surge south across the Great Plains, and sporadic lightning may occur with elevated/weak convection. Southeast of this system, a low-latitude wave will be located over southern TX, with cool midlevel temperatures present. This will aid destabilization despite relatively cool surface temperatures. Dewpoints in the 60s F will be common across the Coastal Plain and perhaps toward the ArkLaTex late, however, given the surface high to the east, low-level trajectories will favor cool surface temperatures and elevated instability in most areas. ..Jewell.. 12/16/2025
