Forecast Details for Pittsburgh, PA

Recent Locations: San Jose, CA Gladeville, TN Pittsburgh, PA

Tonight: Snow likely, mainly between midnight and 2am. Mostly cloudy, with a low around 34. North wind around 5 mph becoming calm after midnight. Chance of precipitation is 70%. Little or no snow accumulation expected.

Sunday: Snow likely, mainly between 10am and 1pm. Mostly cloudy, with a high near 38. Light northwest wind increasing to 5 to 10 mph in the morning. Chance of precipitation is 70%. Little or no snow accumulation expected.

Sunday Night: Snow likely, mainly between 1am and 5am. Mostly cloudy, with a low around 29. Northwest wind 8 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

Monday: Snow likely, mainly between 7am and 1pm. Mostly cloudy, with a high near 35. Northwest wind 13 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

Monday Night: A slight chance of snow. Mostly cloudy, with a low around 18. Northwest wind 11 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 20%.

Tuesday: Partly sunny, with a high near 33.

Tuesday Night: Snow likely, mainly after 1am. Mostly cloudy, with a low around 27. Chance of precipitation is 60%.

Wednesday: A chance of rain and snow before 1pm, then a chance of rain. Mostly cloudy, with a high near 46. Chance of precipitation is 50%.

Wednesday Night: Rain likely, mainly after 1am. Mostly cloudy, with a low around 32. Chance of precipitation is 60%.

Thursday: Rain likely before 1pm, then rain and snow likely. Mostly cloudy, with a high near 44. Chance of precipitation is 60%.

Thursday Night: A chance of rain and snow. Mostly cloudy, with a low around 27. Chance of precipitation is 40%.

Friday: Mostly sunny, with a high near 45.

Friday Night: Mostly clear, with a low around 31.

Saturday: Mostly sunny, with a high near 54.

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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 Cirrus Clouds?

Home - Education - Cloud Types - 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

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