Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0308 AM CST Mon Feb 08 2021 Valid 111200Z - 161200Z ...DISCUSSION... A progressive upper pattern is forecast during the Day 4-8 period, with a series of troughs migrating across the CONUS. The first upper trough in this series will spread eastward across the Plains and toward the Atlantic coast on Day 4/Thu. At the surface, an arctic air mass will percolate south and east behind a cold front, extending from the coastal Carolinas to the central Gulf coast vicinity by Day 5/Fri morning. Thunderstorm potential will exist across parts of the Southeast in the vicinity of the front on Thursday and Friday, though most of this activity is expected to remain elevated/to the cool side of the boundary, limiting severe potential in the absence of stronger surface cyclogenesis. Strong surface high pressure will continue to build south/southeast across the Plains and Midwest, as a second upper trough digs across the western states and shifts eastward over the Plains and Midwest during the weekend. This will reinforce a bitterly cold air mass across much of the U.S. through the end of the period, precluding severe thunderstorm potential.
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