SPC AC 300510
Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
1110 PM CST Wed Nov 29 2017
Valid 021200Z - 031200Z
...NO SEVERE THUNDERSTORM AREAS FORECAST...
...SUMMARY...
A few thunderstorms are possible across western Washington and
Oregon on Saturday.
...Synopsis and Discussion...
A shortwave trough with cold temperatures aloft and a cold front
will move eastward across the northwestern states on Saturday. The
presence of steep lapse rates aloft may support scattered showers, a
few of which could produce lightning, along the WA/OR coasts during
the day. Instability levels east of the Cascades appear too weak for
any appreciable thunderstorm threat.
Elsewhere, a moistening air mass will approach the Texas coast late
in the period with mid to upper 60s dewpoints, as a weak
low-latitude wave provides cool temperatures aloft. However, any
weak instability will remain capped, with thunderstorms unlikely. A
large surface high will then maintain stable conditions across the
remainder of the eastern CONUS.
..Jewell.. 11/30/2017
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