7:00 AM | ***Potent system crosses the Great Lakes today and could contribute to downpours around here late tonight/early Friday***
Paul Dorian
6-Day forecast for the Philadelphia, PA metro region
Today
Patchy fog early today then becoming partly sunny, warm, humid, an isolated late day shower or thunderstorm is possible, highs in the mid-to-upper 80’s; Light and variable winds
Tonight
Mainly cloudy with an increasing chance of showers and thunderstorms, some of the late night storms can be strong and some of the late night rain can be heavy, mild, muggy, lows in the upper 60’s
Friday
Mainly cloudy in the morning with the chance of showers and thunderstorms, some of the early day storms can be strong and some of the early day rain can be heavy, partly sunny in the afternoon with an isolated shower or thunderstorm possible, low-to-mid 80’s for afternoon highs
Friday Night
Becoming partly cloudy, mild, muggy, near 65 degrees for late night lows
Saturday
Mainly sunny, comfortably warm, low-to-mid 80’s
Sunday
Mainly sunny, warm, mid 80’s
Monday
Mainly sunny, warm, more humid, chance of showers and thunderstorms, mid 80’s
Tuesday
Partly sunny, warm, chance of showers and thunderstorms, mid-to-upper 80’s
Discussion
A potent system will cross the Great Lakes later today at the same time a front to our south begins to advance northward as a warm front. The combination of these systems - along with loads of available low-level moisture - will result in an increasing unstable atmosphere from later tonight into early Friday. While there can be an isolated shower or thunderstorm late today, the main action time period, I believe, will be from about midnight-to-noon when showers and thunderstorms are likely to become more numerous. Any late night and early Friday storm can be strong and downpours are on the table…watch out for the possibility of flash flooding. High pressure will then begin to build into the region by Friday night and there is reasonable hope that the weekend actually features back-to-back rain-free days in the Mid-Atlantic region along with comfortably warm temperatures.
Meteorologist Paul Dorian
Arcfield Weather