Latest Forecast

Southerly winds of 10-20 mph on the backside of a high pressure system over the western Atlantic will usher slightly warmer and more humid air into northern MD and southeastern PA today. However, high temperatures and dewpoints should still not exceed the mid-to-upper 80s and upper 50s, respectively, this afternoon. A weak storm system will track from the Great Lakes region into northern New England late this week, and a cold front trailing to its south and west will sag through the Commonwealth from this evening into Friday morning. Due to the overnight or early-morning timing of the frontal passage, only scattered showers are expected to impact south-central PA tonight. Most of Friday should turn out partly-to-mostly cloudy but dry with high temperatures similar to or just a few degrees lower than today. The frontal boundary will stall near the Mason-Dixon Line from Friday afternoon through Saturday evening, and a disturbance riding eastward along it will bring showers or periods of steadier rain to the Lower Susquehanna Valley later Friday night into Saturday. Due to the clouds and wet weather, high temperatures on Saturday will be around 10 degrees below average. Rainfall amounts through the first half of the weekend are currently uncertain. Be prepared to cancel or reschedule outdoor plans, or move them inside, on Saturday, and keep an umbrella handy.