5-Day Forecast for Philadelphia, PA

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Current Alerts for Philadelphia, PA: Special Weather Statement

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Change Units:    °F and mph  -   °C and km/h  -   °C and mph (U.K.)

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5-Day Forecast

National Weather Conditions--Current

National Weather Map--Today

Todays National Weather Map

National Weather Forecast--Tomorrow

National Weather Map--Tomorrow

Tomorrows National Weather Map

North America Infrared

This infrared image shows the relative warmth of objects. Colder objects are brighter and warmer objects are darker. Lower layers of clouds are generally warmer and are gray. Colder and higher clouds tops are highlighted in colors.

Infrared 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.

Water Vapor Map

UV Index Forecast

This map shows expected UV Index values. We all know that exposure to the sun generally feels good and produces Vitamin D for the skin; however, too much exposure to the sun's ultraviolet (UV) radiation can be dangerous as it can cause sunburn, skin cancer and cataracts. The UV Index represents the risk of overexposure to the sun on a scale of 1 to 11+, where 1 is low risk and 11+ is an extreme risk.

UV Index map

National Weather Alerts and Warnings

National Weather Alerts and Warnings. Note that Coordinated Universal Time (UTC) is a 24-hour time standard, is determined using atomic clocks, and expresses the mean solar time at the Earth's prime meridian (zero degrees longitude) located near Greenwich, England. Time zones around the world are expressed as positive or negative offsets from UTC (Eastern Time is -4 hours and Pacific Time is -7 hours). UTC is also often casually interchanged with Greenwich Mean Time (GMT).

National Weather Alerts Map







Weather Topic: What are Cumulonimbus Clouds?

Home - Education - Cloud Types - Cumulonimbus Clouds

cumulonimbus clouds Next Topic: Stratus 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: Stratus Clouds

Weather Topic: What are Nimbostratus Clouds?

Home - Education - Cloud Types - Nimbostratus Clouds

nimbostratus clouds Next Topic: Stratocumulus Clouds

A nimbostratus cloud is similar to a stratus cloud in its formless, smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud, because it is thicker.

Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat of moderate to heavy precipitation. In some cases, the precipitation may evaporate before reaching the ground, a phenomenon known as virga.

Next Topic: Stratocumulus Clouds

This page shows the 5-day weather forecast for the following ZIP codes:
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