Latest Forecast

A vigorous, upper-level disturbance traversing the Commonwealth from west-to-east will trigger widespread showers and heavy, drenching thunderstorms across northern MD, southeastern PA and the Lower Susquehanna Valley through this evening. As has been the case in recent weeks, the primary threat from the storms will be heavy rainfall, torrential downpours with rainfall rates of 2" per hour or more, and localized but potentially devastating flash flooding. A Flood Watch is in effect from 2 PM this afternoon until Midnight. In addition, the most intense storms may produce wind gusts up to 60 mph and cause localized tree- and powerline damage. Have multiple ways to receive severe weather alerts and warnings, and never drive through floodwaters! Instead, turn around and seek an alternate route. Behind the disturbance, an area of high pressure will settle into the Northeast on Tuesday and promote increasing amounts of sunshine throughout the day. An isolated shower or thunderstorm may still erupt between ~2-8 PM, but most areas north of the Mason-Dixon Line will remain dry. Unfortunately, another vigorous disturbance will move into the mid-Atlantic States on Wednesday and spark more numerous showers and storms during the afternoon and evening hours. The main threats from Wednesday's storms will be identical to today. High temperatures will remain in the mid-to-upper 80s through the middle of the week with dewpoints in the low-to-mid 70s and maximum heat indices in the low-to-mid 90s. The stifling humidity and highly-unstable atmosphere are fueling the seemingly continual onslaught of storms and flooding woes.