SPC 2000Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0135 PM CST Sat Dec 20 2025 Valid 202000Z - 211200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... A few lightning flashes may occur today across parts of coastal Washington/Oregon and tonight over southern Louisiana. Severe thunderstorms are not expected. ...20Z Update... No changes have been made to the ongoing forecast. See the previous discussion below for more information. ..Gleason.. 12/20/2025 .PREV DISCUSSION... /ISSUED 0953 AM CST Sat Dec 20 2025/ Dry and stable conditions will prevail over most of the CONUS today, precluding thunderstorms. One exception will be over western WA west of the Cascades, where fast onshore flow, orographic lift, and 100-200 J/kg of CAPE will be present. The other area of some risk of lightning will be over southern LA tonight in a weak low-level warm advection regime. In both areas, thunderstorm coverage is anticipated to be sparse and severe risk negligible.
