Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0355 AM CST Tue Dec 29 2020 Valid 011200Z - 061200Z ...DISCUSSION... ...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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