Forecast Details for Seattle-Tacoma International Airport, WA

Tonight: Partly cloudy, with a low around 41. South southeast wind 3 to 6 mph.
Friday: Mostly sunny, with a high near 58. South southwest wind around 6 mph.
Friday Night: A 30 percent chance of rain after 4am. Increasing clouds, with a low around 44. South wind around 7 mph.
Saturday: Rain, mainly after 10am. High near 54. South wind 7 to 10 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Saturday Night: Rain. Low around 47. South wind 7 to 10 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Sunday: Rain. High near 52. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Sunday Night: Rain likely, mainly before 10pm. Mostly cloudy, with a low around 42. Chance of precipitation is 70%.
Monday: Rain likely, mainly after 10am. Mostly cloudy, with a high near 50.
Monday Night: A chance of rain. Mostly cloudy, with a low around 40.
Tuesday: A chance of rain. Mostly cloudy, with a high near 49.
Tuesday Night: Partly cloudy, with a low around 37.
Wednesday: Partly sunny, with a high near 50.
Wednesday Night: A slight chance of rain. Mostly cloudy, with a low around 39.
Thursday: A chance of rain. Mostly cloudy, with a high near 50.

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Current U.S. National Radar--Current

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National Weather Forecast--Current

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Today's National Weather Map

National Weather Forecast for Tomorrow

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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 Hail?

Home - Education - Precipitation - Hail

Hail Next Topic: Hole Punch Clouds

Hail is a form of precipitation which is recognized by large solid balls or clumps of ice. Hail is created by thunderstorm clouds with strong updrafts of wind. As the hailstones remain in the updraft, ice is deposited onto them until their weight becomes heavy enough for them to fall to the earth's surface.

Hail storms can cause significant damage to crops, aircrafts, and man-made structures, despite the fact that the duration is usually less than ten minutes.

Next Topic: Hole Punch Clouds

Weather Topic: What are Mammatus Clouds?

Home - Education - Cloud Types - Mammatus Clouds

Mammatus Clouds Next Topic: Nimbostratus Clouds

A mammatus cloud is a cloud with a unique feature which resembles a web of pouches hanging along the base of the cloud.

In the United States, mammatus clouds tend to form in the warmer months, commonly in the Midwest and eastern regions.

While they usually form at the bottom of a cumulonimbis cloud, they can also form under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds warn that severe weather is close.

Next Topic: Nimbostratus Clouds

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