Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0341 AM CST Tue Dec 23 2025 Valid 261200Z - 311200Z ...DISCUSSION... From Friday/Day 4 to Sunday/Day 6, a mid-level ridge is forecast to move eastward from the central U.S. to the Eastern Seaboard. During this time, a trough is forecast to develop in the Pacific Northwest, and then to dig southeastward into the mid Mississippi Valley. An associated cold front is forecast to move southeastward into the Ohio and Tennessee Valleys by Sunday afternoon. Ahead of the front, surface dewpoints in the 60s F should result in weak destabilization with thunderstorm development possible along the front. However, the models suggest that most of the convection will be post-frontal. This limitation should keep any severe threat marginal. On Monday/Day 7 and Tuesday/Day 8, the trough is forecast to move across the eastern U.S. into the western Atlantic, with the front moving off the Atlantic coast. In its wake, a relatively dry and cool airmass will make thunderstorm development unlikely across most of the nation.
