Day 4-8 Outlook

Day 4-8 Outlook Image

Day 4-8 Convective Outlook  
NWS Storm Prediction Center Norman OK
0355 AM CST Tue Dec 29 2020

Valid 011200Z - 061200Z

...Friday/Day 4 and Saturday/Day 5...
An upper-level trough is forecast to move northeastward across the
mid Mississippi Valley on Friday as southwest mid-level flow remains
in place along the Eastern Seaboard. The moist sector should be
located across much of Georgia and South Carolina. Thunderstorms may
develop in Georgia Friday afternoon ahead of the upper-level trough
with this convection spreading east-northeastward across South
Carolina and into southern North Carolina. Due to strong low-level
shear, a tornado threat could exist with this activity, in addition
to having a wind damage potential.

On Saturday, southwest mid-level flow is forecast to remain in place
across the Southeast as an upper-level low moves through the Ozarks.
At the surface, a cold front is forecast to advance southeastward
toward southern sections of the Atlantic Seaboard. Thunderstorm
development will be possible along the front during the day.
Although a severe threat is not expected due to weak instability,
isolated strong thunderstorms can not be ruled out in areas that
heat up sufficiently.

...Sunday/Day 6 to Tuesday/Day 8...
An upper-level low is forecast to move northeastward across the
central Appalachians on Sunday as a cold front advances southward
across the Florida Peninsula. Thunderstorm development could occur
Sunday afternoon in central Florida along or just ahead of the
front. An isolated severe threat would be possible if enough
instability can develop.

On Monday and Tuesday, surface high pressure over the central and
eastern U.S. should minimize thunderstorm potential in most of the
continental United States.

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