SPC 0830Z Day 3 Outlook
Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0227 AM CST Mon Dec 20 2021
Valid 221200Z - 231200Z
...NO SEVERE THUNDERSTORM AREAS FORECAST...
...SUMMARY...
Isolated general thunderstorms are possible along a portion of the
West Coast into interior northern California, mainly Wednesday
evening and night.
...West Coast and northern CA...
In the wake of a lead shortwave impulse shifting east from the
Northwest to the northern Rockies, a more amplified trough will
approach the Pacific Northwest coast by 12Z/Thu. In response,
onshore flow will be maintained but more importantly strengthen,
especially during the latter half of the period. While buoyancy will
likely remain scant with surface dew points peaking in the mid to
upper 40s, steep low to mid-level lapse rates and increasing
large-scale ascent may prove sufficient for sporadic lightning
production along the immediate coast. A low-probability thunder
threat may spread into interior northern CA as well, mainly on
Wednesday night.
..Grams.. 12/20/2021
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