Latest Forecast

An area of high pressure over the mid-Atlantic States will promote mostly sunny skies, low humidity and seasonably warm conditions across the Lower Susquehanna Valley this afternoon. The high pressure system will then shift into the western Atlantic tonight, and southerly winds on its backside will usher more humid air into the region. Scattered showers and thunderstorms are then expected to erupt from Thursday into Thursday night well in advance of a cold front. The worst storms will likely occur Thursday afternoon and evening and produce frequent lightning, torrential downpours and locally damaging wind gusts up to 60 mph. Some downed trees and power lines, as well as flash flooding of low-lying, urban- and poor-drainage areas, may occur. Behind the front, north-northwesterly winds will usher a drier and slightly less humid air mass into northern MD and southeastern PA on Friday, but high temperatures and dewpoints should still be in the low-to-mid 80s and mid-to-upper 60s, respectively. An isolated shower or thunderstorm cannot be ruled out Friday afternoon, but most areas should remain dry.