Forecast Details for Philadelphia, PA

Recent Locations: Philadelphia, PA  
Overnight: A chance of showers and thunderstorms, mainly after 2am. Mostly cloudy, with a low around 72. Northeast wind around 5 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday: A chance of showers and thunderstorms. Patchy fog before 11am, then patchy fog after noon. Otherwise, cloudy, with a high near 80. East wind 5 to 10 mph. Chance of precipitation is 40%. New rainfall amounts between a quarter and half of an inch possible.
Thursday Night: A slight chance of showers before 9pm. Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 70. Northeast wind around 5 mph. Chance of precipitation is 20%.
Friday: Partly sunny, with a high near 88. Northeast wind around 5 mph becoming northwest in the afternoon.
Friday Night: A chance of showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 72. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday: Showers likely and possibly a thunderstorm before 11am, then a chance of showers. Partly sunny, with a high near 83. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday Night: Partly cloudy, with a low around 66.
Sunday: Sunny, with a high near 83.
Sunday Night: Mostly clear, with a low around 64.
Monday: Sunny, with a high near 84.
Monday Night: Mostly clear, with a low around 67.
Tuesday: A chance of showers and thunderstorms. Sunny, with a high near 89. Chance of precipitation is 30%.
Tuesday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 72. Chance of precipitation is 30%.
Wednesday: A chance of showers. Mostly sunny, with a high near 89. Chance of precipitation is 30%.

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Current U.S. National Radar--Current

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National Weather Forecast--Current

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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 is Condensation?

Home - Education - Precipitation - Condensation

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