Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0152 AM CST Thu Feb 20 2025 Valid 221200Z - 231200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Isolated thunderstorms are possible near the middle and upper Texas coastal vicinity Saturday evening into early Sunday. ...Synopsis... An upper shortwave trough will shift east from AZ into the southern Plains on Saturday. Surface high pressure and a cool airmass will persist over the southern Plains and Gulf coast. However, increasing southwesterly midlevel flow and midlevel moistening is expected as the shortwave trough ejects eastward. Warm advection atop the cool boundary layer and steepening midlevel lapse rates will result in increasing precipitation chances from late afternoon into the overnight hours across portions of the middle and upper TX coastal vicinity. Sufficient elevated instability (generally less than 400 J/kg MUCAPE) will exist to support isolated thunderstorms. Severe thunderstorm potential is not expected. ..Leitman.. 02/20/2025
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