Forecast Details for Philadelphia, PA

Recent Locations: Lancaster, CA Philadelphia, PA

Overnight: Mostly clear, with a low around 12. North wind around 5 mph.

Thursday: Sunny, with a high near 29. North wind 5 to 10 mph.

Thursday Night: Mostly cloudy, with a low around 11. Northwest wind around 5 mph becoming calm.

Friday: A chance of light snow after 4pm. Mostly cloudy, with a high near 31. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 30%. New snow accumulation of less than a half inch possible.

Friday Night: Light snow likely before midnight, then snow showers likely, mainly between midnight and 1am. Cloudy, with a low around 18. Southwest wind 5 to 15 mph becoming west after midnight. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.

Saturday: A slight chance of snow showers before 1pm. Mostly cloudy, with a high near 20. Blustery. Chance of precipitation is 20%.

Saturday Night: Mostly clear, with a low around 6.

Sunday: Mostly sunny, with a high near 21.

Sunday Night: Mostly cloudy, with a low around 11.

Monday: Mostly cloudy, with a high near 30.

Monday Night: Mostly cloudy, with a low around 21.

Tuesday: Cloudy, with a high near 35.

Tuesday Night: Cloudy, with a low around 22.

Wednesday: Mostly cloudy, with a high near 36.

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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)

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.

Weather Topic: What are Contrails?

Home - Education - Cloud Types - 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

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