SPC AC 080652
Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1252 AM CST Thu Dec 08 2016
Valid 091200Z - 101200Z
...NO SEVERE THUNDERSTORM AREAS FORECAST...
Severe thunderstorms are not expected across the United States
Friday through Friday night.
A progressive flow pattern across the contiguous United States will
become nearly zonal on Friday, with one trough moving off the East
Coast. Meanwhile, a closed low forming in the northeast Pacific
(west of British Columbia and Washington/Oregon) is expected to
break down on Friday, with several low-amplitude impulses advancing
inland through the Pacific Northwest to the northern Rockies.
Offshore low-level flow into the Gulf of Mexico will be maintained
as a large anticyclone shifts east encompassing much of the U.S.
east of the Mississippi Valley. This will continue to shunt
moisture equatorward into the southern portions of the Gulf Basin,
precluding moisture return, while this expected synoptic pattern
inhibits thunderstorm development.
The exception to the negligible lightning potential this forecast
period will be primarily over and in the lee of Lake Erie, where
inversion heights will remain deep enough for charge separation.
Cold lower-tropospheric air spreading across warm lake surface
temperatures (45-50 degrees F) should maintain steep lapse rates and
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NOTE: THE NEXT DAY 2 OUTLOOK IS SCHEDULED BY 1730Z