Monday 9 a.m.
Today's video shows why the recent humid weather in the Northeast is headed for history.
However, strong thunderstorms formed over Long Island this morning, and some that activity will across the parts of Rhode Island that had flash flooding yesterday. Here is what the radar showed just before 10:30 this morning:
With northwesterly flow becoming established across the Northeast by tomorrow, another cold front (from Manitoba) will have little difficulty reaching the I-95 corridor from D.C. to Portland, Maine, by early Thursday.
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.
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.