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 Cirrus Clouds?

Home - Education - Cloud Types - Cirrus Clouds

Cirrus Clouds Next Topic: Condensation

Cirrus clouds are high-level clouds that occur above 20,000 feet and are composed mainly of ice crystals. They are thin and wispy in appearance.

What do they indicate?
They are often the first sign of an approaching storm.

Next Topic: Condensation

Weather Topic: What are Contrails?

Home - Education - Cloud Types - Contrails

Contrails Next Topic: Cumulonimbus Clouds

A contrail is an artificial cloud, created by the passing of an aircraft.

Contrails form because water vapor in the exhaust of aircraft engines is suspended in the air under certain temperatures and humidity conditions. These contrails are called exhaust contrails.

Another type of contrail can form due to a temporary reduction in air pressure moving over the plane's surface, causing condensation. These are called aerodynamic contrails.

When you can see your breath on a cold day, it is also because of condensation. The reason contrails last longer than the condensation from your breath is because the water in contrails freezes into ice particles.

Next Topic: Cumulonimbus Clouds