Another round of severe weather is marching through portions of the Mid Atlantic and Northeast, prompting the National Weather Service to issue a large Severe Thunderstorm Watch and numerous Severe Thunderstorm Warnings. The National Weather Service is encouraging people in a warning to move to an interior room on the lowest floor of a
building. There are numerous reports of continuous cloud to ground lightning, which on its own is a hazard. Torrential rainfall is also occurring with these storms and may lead to flash flooding.
While storms have fired up and prompted many warnings to be issued, another round is possible this evening, perhaps in the same areas hit hard this afternoon. Along the I-95 corridor, there could even be a brief lull in the activity this afternoon. This will occur as a developing frontal system approaches from the west associated with a medium amplitude, progressive upper level trough. Expect strong to severe storms to develop with this feature over central Pennsylvania and Maryland. Since the shear and forcing will be stronger later in the day, storms will be better organized and will take on a multi-cellular structure in the from of one or more line or line segments. Some of the worst storms could hit between 5pm and 1am. The primary threat will be in the form of damaging wind gusts; however, an isolated tornado cannot be ruled out. Storms that form can also drop very heavy rain over a short period of time; as such, isolated flash flood conditions will be possible at the same time too.
High pressure will build into the northeast early Thursday, drying conditions out