A long week of soggy weather is on tap for the Carolinas and much of southern Virginia as a stalled upper-level low produces repetitive rounds of drenching rains through Thursday night.
A surge of moisture from the southeast and ample lift from the stalled upper-level low will provide plenty of opportunities for batches of heavy rain to develop over the next couple of days.
Flash flood watches are in effect across much of the southern Appalachians and the Piedmont in anticipation of heavy rain that could overwhelm local waterways and sewerage systems. The latest forecast from the Weather Prediction Center calls for several inches of rain from southwestern Virginia to upstate South Carolina, with the bulk of the heavy rain focused on North Carolina. The heaviest rain will fall on Wednesday and Thursday.
The recent gloomy weather in the Mid-Atlantic and the southeast is the result of a cutoff low, or an upper-level low that’s separated from the jet stream and remains nearly stationary without anything to nudge it along. This low sank south out of the northern Plains this past weekend, getting cut off from the jet stream by a strong ridge of high pressure that built into central Canada.