SPC 0830Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0227 AM CST Thu Dec 18 2025 Valid 201200Z - 211200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms are possible across western Washington and far northwest Oregon on Saturday. ...Synopsis... A strong mid-level jet streak over the northern Plains Saturday morning will move east as a mid-level trough amplifies across the Great Lakes. As this occurs, a surface cold front will move from the Plains Saturday morning to near the Appalachians and extending back into East Texas by early Sunday morning. ...East Texas into Louisiana... Low-level moisture return will bring low to mid 60s dewpoints northward across East Texas and Louisiana on Saturday and Saturday evening. Weak to potentially moderate instability is forecast to develop. However forcing will be minimal with rising heights aloft and a weakening low-level jet. In addition, forecast soundings show warm mid-level temperatures which will likely keep the airmass capped. Therefore, thunderstorms are not expected across East Texas and Louisiana on Saturday night/early Sunday. ...Pacific Northwest.. Persistent onshore flow with cool temperatures aloft will result in persistent convective activity across western Washington and northwest Oregon on Saturday. Forecast soundings show weak instability and equilibrium levels near or slightly above -20C which may support some isolated thunderstorms. ..Bentley.. 12/18/2025
