SPC AC 240652
Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
1252 AM CST Fri Nov 24 2017
Valid 261200Z - 271200Z
...NO THUNDERSTORM AREAS FORECAST...
Thunderstorms are not currently expected across the contiguous
United States on Sunday.
Late this weekend, a rather amplified mid-level trough will approach
the Pacific Coast, resulting in a slow eastward progression of a
downstream ridge towards the Plains. Meanwhile, broad cyclonic flow
will remain established from the Mississippi Valley eastward. Along
the western periphery of this cyclonic regime, rising heights aloft
will help maintain surface ridging and a dry/continental air mass
east of the Rockies, precluding thunderstorm development.
Farther west, cooling mid-level temperatures late in the period (in
association with the aforementioned trough) will likely yield weak
buoyancy sufficient for showers over parts of northern California
and southern Oregon. While a lightning strike or two may occur near
the coast, forecast soundings suggest the depth of buoyancy will be
too marginal for the introduction of a general-thunder area at this
NOTE: THE NEXT DAY 3 OUTLOOK IS SCHEDULED BY 0830Z