Forecast Details for Philadelphia, PA

Recent Locations: Philadelphia, PA  
Today: A chance of snow showers before 3pm, then a chance of rain and snow showers. Cloudy, with a high near 37. Northeast wind 5 to 10 mph. Chance of precipitation is 40%. Total daytime snow accumulation of less than a half inch possible.
Tonight: Rain, snow, and sleet likely before 7pm, then periods of rain. Low around 34. East wind 5 to 10 mph. Chance of precipitation is 100%. Little or no snow and sleet accumulation expected.
Thursday: A chance of rain, mainly before 10am. Mostly cloudy, with a high near 50. East wind 5 to 15 mph becoming west in the afternoon. Chance of precipitation is 50%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night: Mostly clear, with a low around 27. West wind 10 to 15 mph, with gusts as high as 25 mph.
Friday: Sunny, with a high near 37. Northwest wind around 10 mph, with gusts as high as 25 mph.
Friday Night: Mostly cloudy, with a low around 26.
Saturday: A chance of snow before 1pm, then rain. High near 39. Chance of precipitation is 90%.
Saturday Night: Rain. Low around 37. Chance of precipitation is 100%.
Sunday: Rain. High near 56. Chance of precipitation is 100%.
Sunday Night: A chance of rain and snow before 1am. Mostly cloudy, with a low around 24. Chance of precipitation is 40%.
Washington's Birthday: Sunny, with a high near 32. Breezy.
Monday Night: Partly cloudy, with a low around 18.
Tuesday: Mostly sunny, with a high near 30.

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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

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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