Forecast Details for Philadelphia, PA

Recent Locations: Philadelphia, PA

Today: A chance of showers, mainly after 5pm. Patchy fog before 10am. Otherwise, partly sunny, with a high near 80. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: Showers and thunderstorms before 5am, then showers likely. Low around 59. South wind around 5 mph becoming north after midnight. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.

Saturday: Showers likely, then showers and possibly a thunderstorm after 11am. High near 72. West wind around 10 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

Saturday Night: Showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Low around 50. West wind 5 to 10 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Sunday: Sunny, with a high near 70. West wind around 10 mph, with gusts as high as 20 mph.

Sunday Night: Partly cloudy, with a low around 51.

Monday: Sunny, with a high near 75.

Monday Night: Mostly clear, with a low around 55.

Tuesday: Sunny, with a high near 81.

Tuesday Night: Mostly clear, with a low around 59.

Wednesday: Sunny, with a high near 87.

Wednesday Night: Partly cloudy, with a low around 66.

Thursday: A chance of showers. Mostly sunny, with a high near 88. 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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National Weather Forecast for Tomorrow

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North America Water Vapor (Moisture)

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Weather Topic: What is Rain?

Home - Education - Precipitation - Rain

Rain Next Topic: Shelf Clouds

Precipitation in the form of water droplets is called rain. Rain generally has a tendency to fall with less intensity over a greater period of time, and when rainfall is more severe it is usually less sustained.

Rain is the most common form of precipitation and happens with greater frequency depending on the season and regional influences. Cities have been shown to have an observable effect on rainfall, due to an effect called the urban heat island. Compared to upwind, monthly rainfall between twenty and forty miles downwind of cities is 30% greater.

Next Topic: Shelf Clouds

Weather Topic: What is Sleet?

Home - Education - Precipitation - Sleet

Sleet Next Topic: Snow

Sleet is a form of precipitation in which small ice pellets are the primary components. These ice pellets are smaller and more translucent than hailstones, and harder than graupel. Sleet is caused by specific atmospheric conditions and therefore typically doesn't last for extended periods of time.

The condition which leads to sleet formation requires a warmer body of air to be wedged in between two sub-freezing bodies of air. When snow falls through a warmer layer of air it melts, and as it falls through the next sub-freezing body of air it freezes again, forming ice pellets known as sleet. In some cases, water droplets don't have time to freeze before reaching the surface and the result is freezing rain.

Next Topic: Snow