Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0632 AM CST Sat Dec 20 2025
Valid 201300Z - 211200Z
...NO SEVERE THUNDERSTORM AREAS FORECAST...
...SUMMARY...
Severe thunderstorms are not expected, but a few lightning flashes
may occur today near coastal Washington.
...Discussion...
Progressive/low-amplitude flow aloft will prevail over the CONUS to
the south of an amplifying shortwave trough over the Great
Lakes/Ontario. Surface high pressure will expand eastward across the
Plains and Midwest. Some inland moistening will occur across east
Texas toward the Lower Mississippi Valley via the western Gulf, but
weak forcing/capping will hinder appreciable convective development.
In the Pacific Northwest, a marginally supportive thermodynamic
environment may allow for a few lightning flashes near the
Washington coast today and tonight.
..Guyer/Marsh.. 12/20/2025
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