Here is today's video, with a look at a Friday forecast challenge for the Middle Atlantic states. The map below the video illustrates the concern for Friday.
On this map, we see the flow coming toward D.C., Baltimore, Philadelphia and New York City originates over the cool waters of the Atlantic. In contrast, the flow on the west side of the Appalachians comes from where it is hot. The boundary between the air masses will move north, its timing determining when each place becomes warmer.
A pocket of dry air covers most of the area from the Great Lakes to the back edge of the East Coast clouds. This suggests sunshine will be the rule across the Northeast until the next frontal system approaches later in the week.
Here is the severe weather outlook for today from the NWS Storm Prediction Center. Note at the bottom the population in each alert area is listed. Keep in mind that in any given severe weather situation, the number of individuals directly affected is far less than the number of people potentially threatened.
South of the cold front, the air has become rather polluted. Sunshine operating on the hazy air will help to generate ozone. This map shows expected air quality for today.
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.