Forecast Details for Philadelphia, PA

Recent Locations: Philadelphia, PA  
Today: Cloudy early, then gradual clearing, with a high near 67. West wind 5 to 15 mph, with gusts as high as 30 mph.
Tonight: Mostly clear, with a low around 42. Northwest wind 5 to 15 mph.
Sunday: Partly sunny, with a high near 58. West wind 5 to 10 mph.
Sunday Night: Mostly cloudy, then gradually becoming clear, with a low around 44. West wind around 5 mph.
Monday: Sunny, with a high near 63. Northwest wind 5 to 10 mph.
Monday Night: Clear, with a low around 44.
Tuesday: Sunny, with a high near 68.
Tuesday Night: Mostly cloudy, with a low around 50.
Wednesday: A chance of showers after 8am. Partly sunny, with a high near 64. Chance of precipitation is 50%.
Wednesday Night: Mostly clear, with a low around 40.
Thursday: Sunny, with a high near 62.
Thursday Night: Mostly clear, with a low around 40.
Friday: Sunny, with a high near 65.

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Current U.S. National Radar--Current

The Current National Weather Radar is shown below with a UTC Time (subtract 5 hours from UTC to get Eastern Time).

Current U.S. National Radar

National Weather Forecast--Current

The Current National Weather Forecast and National Weather Map are shown below.

Today's National Weather Map

National Weather Forecast for Tomorrow

Tomorrow National Weather Forecast and Tomorrow National Weather Map are show below.

Tomorrows National Weather Map

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 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