SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0729 PM CDT Wed Oct 22 2025 Valid 230100Z - 231200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms are possible, primarily across portions of the southwestern U.S., this evening. ...01z Update... Water-vapor imagery depicts an upper low advancing inland across southern CA. This feature will move into northwestern AZ by 23/12z as 500mb speed max translates across the lower CO River Valley into eastern AZ late tonight. Along/north of this jet, cool midlevel temperatures and steep lapse rates are proving favorable for isolated thunderstorms. While nocturnal cooling should lead to weaker updrafts and less lightning by late evening, a few flashes may continue to accompany elevated convection that forms in response to moistening midlevels ahead of the trough. ..Darrow.. 10/23/2025
