SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1046 AM CST Sun Dec 21 2025 Valid 221200Z - 231200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not forecast on Monday. ...Synopsis and Discussion... Minimal thunderstorm potential remains evident across much of the CONUS on Monday, as upper-level ridging is maintained over the central U.S. One exception may be across parts of coastal WA/OR as a mid-level shortwave trough progresses eastward from the eastern Pacific into British Columbia and the Pacific Northwest through Monday afternoon/evening. Even though daytime heating and low-level moisture are forecast to remain limited, cool temperatures aloft and weak MUCAPE associated with the shortwave trough may support occasional lightning flashes with low-topped convection moving inland along the immediate WA/OR Coast. A plume of mid-level moisture and associated precipitation will impact parts of northern/central CA through the period, although warmer mid-level temperatures compared to locations farther north and negligible forecast instability suggest little potential for lightning. Elsewhere, very weak forcing aloft should limit thunderstorm potential across coastal TX to the central Gulf Coast, even as low-level moisture gradually increases across these areas. ..Gleason.. 12/21/2025
