Forecast Details for Philadelphia, PA

Recent Locations: Santa Ana, CA Miami, FL Philadelphia, PA

Tonight: Light snow likely, mainly between 4am and 5am. Cloudy, with a low around 13. Southwest wind 5 to 15 mph becoming northwest after midnight. Chance of precipitation is 60%. Total nighttime snow accumulation of less than one inch possible.

Saturday: A chance of light snow before 7am. Partly sunny, with a temperature falling to around 11 by 9am. Wind chill values as low as -10. Windy, with a northwest wind 25 to 30 mph, with gusts as high as 55 mph. Chance of precipitation is 30%. New snow accumulation of less than a half inch possible.

Saturday Night: Mostly clear, with a low around 5. Wind chill values as low as -12. Blustery, with a northwest wind 15 to 25 mph, with gusts as high as 45 mph.

Sunday: Sunny, with a high near 20. Wind chill values as low as -10. Northwest wind around 15 mph, with gusts as high as 30 mph.

Sunday Night: Mostly clear, with a low around 6. Northwest wind around 5 mph.

Monday: Partly sunny, with a high near 26.

Monday Night: Partly cloudy, with a low around 14.

Tuesday: Mostly sunny, with a high near 35.

Tuesday Night: Mostly cloudy, with a low around 24.

Wednesday: A chance of rain and snow. Mostly cloudy, with a high near 37. Chance of precipitation is 50%.

Wednesday Night: A chance of rain and snow. Mostly cloudy, with a low around 26. Chance of precipitation is 40%.

Thursday: Mostly cloudy, with a high near 35.

Thursday Night: Partly cloudy, with a low around 22.

Friday: Mostly sunny, with a high near 33.

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Current U.S. National Radar--Current

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National Weather Forecast--Current

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National Weather Forecast for Tomorrow

Tomorrow National Weather Forecast and Tomorrow National Weather Map are show below.

North America Water Vapor (Moisture)

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Weather Topic: What is Precipitation?

Home - Education - Precipitation - Precipitation

Next Topic: Rain

Precipitation can refer to many different forms of water that may fall from clouds. Precipitation occurs after a cloud has become saturated to the point where its water particles are more dense than the air below the cloud.

In most cases, precipitation will reach the ground, but it is not uncommon for precipitation to evaporate before it reaches the earth's surface. When precipitation evaporates before it contacts the ground it is called Virga. Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog and mist are not considered precipitation because the water vapor which constitutes them isn't dense enough to fall to the ground.

Next Topic: Rain

Weather Topic: What are Shelf Clouds?

Home - Education - Cloud Types - Shelf Clouds

Shelf Clouds Next Topic: Sleet

A shelf cloud is similar to a wall cloud, but forms at the front of a storm cloud, instead of at the rear, where wall clouds form.

A shelf cloud is caused by a series of events set into motion by the advancing storm; first, cool air settles along the ground where precipitation has just fallen. As the cool air is brought in, the warmer air is displaced, and rises above it, because it is less dense. When the warmer air reaches the bottom of the storm cloud, it begins to cool again, and the resulting condensation is a visible shelf cloud.

Next Topic: Sleet