SPC 1930Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0123 PM CST Fri Dec 19 2025 Valid 211200Z - 221200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Minimal thunderstorm activity is expected on Sunday across the USA. ...Synopsis... A broad upper trough will move across the Northeast on Sunday, with generally zonal flow extending to the west. At the surface, high pressure will move eastward across the Midwest during day, and toward the Mid Atlantic by Monday morning. As result of the dry air mass, stable conditions will be prevalent over much of the central and eastern CONUS. To the west, a weak midlevel feature will approach the Pacific Northwest with cooling aloft as a cold front approaches the WA/OR Coast around 00Z. Little if any instability is forecast to be present except primarily over the ocean. Farther south, southwest flow with midlevel moisture and lift will be prevalent across much of northern CA, and weak elevated instability is forecast by some of the models. However, overall thunderstorm/lightning coverage will likely be quite low. ..Jewell.. 12/19/2025
