Forecast Details for Philadelphia, PA

Recent Locations: Philadelphia, PA  
Tonight: Mostly clear, with a low around 9. North wind around 5 mph becoming calm in the evening.
Monday: Mostly sunny, with a high near 30. Calm wind becoming southeast around 5 mph.
Monday Night: A chance of snow after 1am. Mostly cloudy, with a low around 25. Calm wind. Chance of precipitation is 30%. New snow accumulation of less than a half inch possible.
Tuesday: A chance of rain and snow before noon, then a chance of rain between noon and 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 39. Calm wind becoming west around 5 mph. Chance of precipitation is 30%. New snow accumulation of less than a half inch possible.
Tuesday Night: Partly cloudy, with a low around 27. Calm wind.
Christmas Day: Partly sunny, with a high near 37.
Wednesday Night: Mostly cloudy, with a low around 26.
Thursday: Partly sunny, with a high near 39.
Thursday Night: Mostly cloudy, with a low around 28.
Friday: Partly sunny, with a high near 42.
Friday Night: Mostly cloudy, with a low around 30.
Saturday: A chance of rain. Partly sunny, with a high near 45. Chance of precipitation is 30%.
Saturday Night: A chance of rain and snow. Mostly cloudy, with a low around 35. Chance of precipitation is 30%.
Sunday: A chance of rain. Mostly cloudy, with a high near 47. Chance of precipitation is 40%.

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Current U.S. National Radar--Current

The Current National Weather Radar is shown below with a UTC Time (subtract 5 hours from UTC to get Eastern Time).

Current U.S. National Radar

National Weather Forecast--Current

The Current National Weather Forecast and National Weather Map are shown below.

Today's National Weather Map

National Weather Forecast for Tomorrow

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

Tomorrows National Weather Map

North America Water Vapor (Moisture)

This map shows recent moisture content over North America. Bright and colored areas show high moisture (ie, clouds); brown indicates very little moisture present; black indicates no moisture.

North American Water Vapor Map

Weather Topic: What are Mammatus Clouds?

Home - Education - Cloud Types - Mammatus Clouds

Mammatus Clouds Next Topic: Nimbostratus Clouds

A mammatus cloud is a cloud with a unique feature which resembles a web of pouches hanging along the base of the cloud.

In the United States, mammatus clouds tend to form in the warmer months, commonly in the Midwest and eastern regions.

While they usually form at the bottom of a cumulonimbis cloud, they can also form under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds warn that severe weather is close.

Next Topic: Nimbostratus Clouds

Weather Topic: What is Precipitation?

Home - Education - Precipitation - 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