PA weather: thunderstorms, falling temperatures as autumn arrives

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PHILADELPHIA, PA – Forecasters say the “coldest air in months” is on its way to eastern Pennsylvania, and could bring rain, thunderstorms and temperatures in the low 40s when the autumnal equinox arrives.

Warm temperatures and calm skies will prevail all day Wednesday, the National Weather Service said. But a few thunderstorms could arrive Wednesday evening in the region.

Things will really start to change on Thursday, the Equinox. Forecasters say up to a quarter inch of rain could fall, with thunderstorms likely.

The minimums will drop to 54 in the city on Thursday and 49 on Friday, the National Weather Service said.

“The strongest wave of cool air since May will arrive in the northeast just in time for the official start of autumn,” said AccuWeather meteorologists.

The full forecast through the end of the week is included below, according to the National Weather Service:

Tuesday

Sunny, with highs near 81. Wind northwest around 10 mph, gusting up to 20 mph.

Tuesday evening

Fairly clear, with a low around 62. Wind northwest around 5 mph becoming calm in the evening.

Wednesday

Sunny with highs near 85. Wind northwest 5 to 10 mph becoming southwest in the afternoon.

Wednesday evening

Chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 69. Wind southwest 5 to 10 mph. The chance of precipitation is 30%. New precipitation amounts less than a tenth of an inch except higher amounts possible in thunderstorms.

Thursday

Showers and thunderstorms likely, mainly before 2 p.m. Partly sunny, with highs near 77. Wind northwest around 10 mph, gusting up to 20 mph. The chance of precipitation is 60%. New precipitation is between a tenth and a quarter inch, barring higher amounts possible in thunderstorms.

thursday evening

Partly cloudy, with a low around 54.

Friday

Sunny, with a high near 66.

Friday night

Rather clear, with a low around 49.

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