Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0621 PM CST Wed Dec 17 2025 Valid 180100Z - 181200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms are possible along portions of the TX/LA Gulf coasts tonight. ...01z Update... Weak, southern-stream short-wave trough is advancing off the south TX coast early this evening. A few thunderstorms linger near the center of a weak midlevel circulation around the Corpus Christi region; however, the most concentrated deep convection is now focused offshore and should continue to be shunted east ahead of the short wave. Isolated thunderstorms may eventually develop ahead of this feature downstream across southeast LA later tonight, but negligible buoyancy currently exists on the 00z sounding from LIX. By the end of the period, adequate destabilization should materialize across this region such that lightning is possible with deep convection, primarily after 08-09z. ..Darrow.. 12/18/2025Read more