Latest Forecast

A slow-moving storm system and its trailing cold front will track from the eastern Great Lakes region into southern New England over the next 24-36 hours and trigger widespread showers and thunderstorms across northern MD and southeastern PA this afternoon. The most intense storms will produce torrential downpours, frequent lightning, small hail, localized flash flooding of urban-, low-lying and poor-drainage areas, and damaging wind gusts up to 60 mph between 1-8 PM. Be alert for debris and standing water on some roadways during the PM commute, and seek shelter in an interior room or basement if a severe thunderstorm warning is issued. Rainfall rates could exceed 2" per hour in the worst storms, and areas hit repeatedly may receive 3-5" of rain. Behind the front, northwesterly winds of 12-25 mph will usher slightly cooler and drier air into the Commonwealth on Wednesday, but a few afternoon showers are still expected with the system over southeastern NY or northern NJ. It will finally move into the western Atlantic on Thursday, so no more than a stray shower should dot the Lower Susquehanna Valley. Most of the day will turn out partly sunny, breezy and dry with high temperatures around 5 degrees below normal.