Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1126 PM CST Fri Dec 20 2024
Valid 211200Z - 221200Z
...NO SEVERE THUNDERSTORM AREAS FORECAST...
...SUMMARY...
Isolated thunderstorms are possible this morning into early
afternoon across parts of coastal Oregon and northern California.
...Coastal OR/northern CA...
A shortwave trough will progress northeastward and reach the Pacific
Northwest coast midday, then pivot eastward towards the northern
Rockies through tonight. A pronounced low-level warm conveyor will
overspread the coast early this morning with an attendant rain swath
moving onshore by 12Z. Embedded, isolated thunderstorm potential
should be confined to northern CA during the morning, along the
northern periphery of scant to meager MUCAPE, before ascent wanes.
Along the OR coast, a period of steep mid-level lapse rates
attendant to the mid-level cold core should be coincident with
onshore southwesterly low-level flow. Sporadic lightning flashes may
accompany scattered low-topped convection from late morning to early
afternoon, before mid-level temperatures rapidly warm with further
inland progression of the trough.
..Grams/Weinman.. 12/21/2024
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