Timeline For Weekend Thunderstorms, Dense Fog In Philly Area

EASTERN PA — Scattered rain showers are in the forecast for eastern Pennsylvania on Friday, with dense fog and thunderstorms expected to linger through the weekend.

Commuters in the Keystone State are in store for hefty morning fog, which is expected to clear by late morning or early afternoon, though low clouds will persist for much of the day, the National Weather Service said. A dense fog advisory has been issued until 8 a.m. for all marine areas and the immediate coastal areas hugging the Jersey Shore and Delaware River.

“Use caution if you're driving near the coast this morning. The fog is quite dense! Slow down and use low beam headlights if you encounter low visibility,” the agency said in a tweet on Friday.

Visibility will be one quarter mile or less in dense fog, paving the way for hazardous driving conditions due to low visibility.

“If driving, slow down, use your headlights and leave plenty of distance ahead of you,” the agency said.

Temperatures are generally expected to stay in the 60s and low 70s. “Overall, just a cloudy, damp, dreary day,” the National Weather Service said.

Here’s what’s expected to happen:

• Expect light scattered showers throughout the day spreading westward. Rainfall accumulation will be minimal, with “around a few hundreds of an inch of rain,” according to the National Weather Service.
• “The main concern [Friday] will be the fog, mainly along the coast,” the National Weather Service said in a forecast discussion. Visibility will be one quarter mile or less in affected areas. Fog is expected to continue into Saturday morning.
• Saturday should see mostly cloudy and humid weather in the 70s, with scattered showers and thunderstorms in the afternoon and evening.
• Sunday will continue the humid trend with muggy and warm weather in the upper 70s to 80 degrees, with mostly cloudy skies and scattered thunderstorms in the afternoon and evening.

Here's the full forecast:

Friday

A chance of showers. Patchy fog before 2pm. Otherwise, cloudy, with a high near 72. East wind 5 to 10 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

friday night

A chance of showers, mainly after 3am. Patchy fog before 2am, then patchy fog after 3am. Otherwise, cloudy, with a low around 62. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Saturday

A chance of showers, with thunderstorms also possible after 2pm. Cloudy, with a high near 75. Southeast wind around 5 mph. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Saturday Night

A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Mostly cloudy, with a low around 63. South wind around 5 mph becoming calm after midnight. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Sunday

A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 81. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Sunday Night

A chance of showers and thunderstorms before 2am, then a slight chance of showers. Mostly cloudy, with a low around 64. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Monday

Showers likely and possibly a thunderstorm, mainly after 2pm. Partly sunny, with a high near 81. Chance of precipitation is 60%.

Monday Night

Showers likely and possibly a thunderstorm before 8pm. Partly cloudy, with a low around 58. Chance of precipitation is 60%.