In this video, we look at the nature of the rain event that is heading toward the Middle and North Atlantic states. As with other rain-producing systems this summer, this one is likely to include narrow bands of excessive rain capable of causing street flooding in a matter of minutes.
The following regional radar map shows that while there are not any large shields of steady rain, there are pockets and bands of rain and thunderstorms that contain heavy precipitation.
The most intense and concentrated lightning zone yesterday was not associated with the eastern low pressure area but rather with a low pressure and a virtually stationary front in the Plains.
In response to cold air aloft, daytime heating at ground level and available moisture, showers and thunderstorms will develop today from Pennsylvania and southern New Jersey on south through Virginia.
Rain will be followed by sunny days in the Ohio Valley and parts of the Appalachians, but it may take two to three days for clouds and the threat of showers to inch east of the Northeast and Middle Atlantic coast early next week.
This map shows the serpentine upper air pattern and the upper air trough associated with the weekend rain storm.
The area around the Great Lakes may have fine weather with a warming trend right through the coming weekend. The difference in outcomes between the Great Lakes and the Middle Atlantic states is illustrated by these two meteograms.