Forecast Details for Philadelphia, PA

Recent Locations: Philadelphia, PA  
Today: Partly sunny, with a high near 38. West wind around 15 mph, with gusts as high as 30 mph.
Tonight: Partly cloudy, with a low around 30. West wind around 5 mph becoming south after midnight.
Wednesday: Partly sunny, with a high near 46. Southwest wind 10 to 15 mph.
Wednesday Night: Rain likely, mainly after 1am. Mostly cloudy, with a low around 33. Southwest wind around 5 mph becoming northwest after midnight. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday: Snow likely before 1pm. Mostly cloudy, with a high near 35. Northwest wind around 10 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Thursday Night: Partly cloudy, with a low around 15.
Friday: Mostly sunny, with a high near 24.
Friday Night: A chance of snow. Mostly cloudy, with a low around 16. Chance of precipitation is 40%.
Saturday: A chance of snow before 1pm. Partly sunny, with a high near 30. Chance of precipitation is 30%.
Saturday Night: Mostly cloudy, with a low around 20.
Sunday: Partly sunny, with a high near 35.
Sunday Night: Partly cloudy, with a low around 18.
Monday: Mostly sunny, with a high near 31.

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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 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

Weather Topic: What are Cumulus Clouds?

Home - Education - Cloud Types - Cumulus Clouds

Cumulus Clouds Next Topic: Drizzle

Cumulus clouds are fluffy and textured with rounded tops, and may have flat bottoms. The border of a cumulus cloud is clearly defined, and can have the appearance of cotton or cauliflower.

Cumulus clouds form at low altitudes (rarely above 2 km) but can grow very tall, becoming cumulus congestus and possibly the even taller cumulonimbus clouds. When cumulus clouds become taller, they have a greater chance of producing precipitation.

Next Topic: Drizzle