6:15 AM | **Not as hot today and even cooler on Friday after passage of back door cool front**
Paul Dorian
6-Day forecast for the Philadelphia, PA metro region
Today
Mainly sunny, not as hot as yesterday, humid, chance of PM showers and thunderstorms, any thunderstorm can be strong-to-severe, highs in the mid-to-upper 80’s; Calm conditions this morning; E-NE winds around 5 mph in the afternoon
Tonight
Mainly cloudy, mild, chance of showers and thunderstorms, any thunderstorm can be strong-to-severe, lows in the middle 60’s
Friday
Mainly cloudy, noticeably cooler than recent days, chance of showers, maybe a PM thunderstorm, low-to-mid 70’s for afternoon highs
Friday Night
Mainly cloudy, mild, chance of showers and thunderstorms, middle 60’s for late night lows
Saturday
Mainly cloudy, much warmer, humid, chance of showers and thunderstorms, mid-to-upper 80’s
Sunday
Partly sunny, quite warm, humid, chance of showers and thunderstorms, mid-to-upper 80’s
Monday
Partly sunny, quite warm, humid, chance of showers and thunderstorms, mid-to-upper 80’s
Tuesday
Mainly cloudy, quite warm, humid, chance of showers and thunderstorms, some of the storms can be strong-to-severe, upper 80’s
Discussion
The very strong upper-level ridge of high pressure that has been parked overhead during the past few days is now weakening and shifting to the south. At the same time, surface high pressure has built into southeastern Canada and this combination has resulted in the formation of a back door cool front across northern New England which will push southwestward during the next 24 hours to a position in the southern Mid-Atlantic by late Friday. As a result, temperatures will be reduced here today compared to the recent high heat and then it’ll turn even cooler on Friday as a low-level ocean flow of air develops behind the front (i.e., east-to-northeast winds).
There can be showers and thunderstorms from today into tomorrow during this temperature transition period and any storm that forms can be strong-to-severe. The back door cool front will then turn around on Saturday and push back to the north as a warm front resulting in quite warm and humid conditions on both Saturday and Sunday. There will be the chance of showers and thunderstorms on both weekend days, but neither should be a total washout.
Meteorologist Paul Dorian
Arcfield Weather