Heavy rain, falling up to 2.5 inches an hour in the Philadelphia area, will wreak havoc on the East Coast early Monday night. Targeting areas from Boston to Washington, D.C., several systems of potentially severe weather will push east through the evening hours. Rains could be especially heavy around I-95 around rush hour, making for low visibility and hindering travel.
Philadelphia area radar as of 2:30 p.m. EDT
AccuWeather.com Meteorologist Michael Pigott says that the storms will be slow moving, allowing for the heavy amounts of rain to bring flooding risks. Microbursts of wind may exceed 60 mph in some locations, and the threat of small hail cannot be ruled out.
The heat and humidity that sat over the area throughout the day on Monday are big factors in these storms. Philadelphia had a dew point of 70 at 2 p.m. EDT with a RealFeel temperature of 99. Heat and humidity in New York City at this time made it feel like 101 degrees, and 104 degrees in Washington, D.C.
A weak upper-level disturbance will not give enough lift to the systems for widespread, severe weather, but storms could still be quite strong in some locations. They will diminish as the sun goes down and high heat subsides. They should be done by 9 p.m. EDT for Philadelphia through Washington, D.C., and will fade out around midnight for southern New England.