Forecast Details for Pittsburgh, PA

Recent Locations: East Boothbay, ME Pittsburgh, PA

Tonight: Showers and thunderstorms before 5am, then a chance of showers. Low around 62. Southwest wind 8 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Friday: Showers and thunderstorms likely, mainly before 4pm, then showers likely and possibly a thunderstorm after 5pm. Partly sunny, with a high near 77. Southwest wind 9 to 14 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Friday Night: Showers likely and possibly a thunderstorm. Increasing clouds, with a low around 59. Southwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

Saturday: Showers and possibly a thunderstorm before 8am, then showers between 8am and 11am, then showers and possibly a thunderstorm after 11am. High near 70. West wind 5 to 8 mph becoming south in the morning. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

Saturday Night: Showers likely and possibly a thunderstorm. Cloudy, with a low around 56. East wind around 6 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

Sunday: Showers. High near 70. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

Sunday Night: A chance of showers. Mostly cloudy, with a low around 56. Chance of precipitation is 50%.

Monday: A chance of showers, then showers and possibly a thunderstorm after 2pm. High near 74. Chance of precipitation is 80%.

Monday Night: Showers and possibly a thunderstorm before 8pm, then showers likely. Low around 55. Chance of precipitation is 80%.

Tuesday: A chance of showers. Mostly sunny, with a high near 69. Chance of precipitation is 50%.

Tuesday Night: Partly cloudy, with a low around 52.

Wednesday: A chance of showers. Partly sunny, with a high near 73. Chance of precipitation is 30%.

Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 54. Chance of precipitation is 30%.

Thursday: A chance of showers. Partly sunny, with a high near 71. Chance of precipitation is 30%.

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National Weather Forecast--Current

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National Weather Forecast for Tomorrow

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North America Water Vapor (Moisture)

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Weather Topic: What is Condensation?

Home - Education - Precipitation - Condensation

Next Topic: Contrails

Condensation is the process which creates clouds, and therefore it is a crucial process in the water cycle. Condensation is the change of matter from a state of gas into a state of liquid, and it happens because water molecules release heat into the atmosphere and become organized into a more closely packed structure, what we might see as water droplets.

Water is always present in the air around us as a vapor, but it's too small for us to see. When water undergoes the process of condensation it becomes organized into visible water droplets. You've probably seen condensation happen before on the surface of a cold drink!

Next Topic: Contrails

Weather Topic: What are Cumulonimbus Clouds?

Home - Education - Cloud Types - Cumulonimbus Clouds

Cumulonimbus Clouds Next Topic: Cumulus Clouds

The final form taken by a growing cumulus cloud is the cumulonimbus cloud, which is very tall and dense. The tower of a cumulonimbus cloud can soar 23 km into the atmosphere, although most commonly they stop growing at an altitude of 6 km.

Even small cumulonimbus clouds appear very large in comparison to other cloud types. They can signal the approach of stormy weather, such as thunderstorms or blizzards.

Next Topic: Cumulus Clouds