Forecast Details for Seattle-Tacoma International Airport, WA

Overnight: A 20 percent chance of rain. Mostly cloudy, with a low around 42. Light east southeast wind.
Friday: Mostly cloudy, then gradually becoming sunny, with a high near 57. Light and variable wind becoming northwest 5 to 10 mph in the afternoon.
Friday Night: Mostly clear, with a low around 41. Northeast wind 7 to 10 mph.
Saturday: Mostly sunny, with a high near 58. North northwest wind around 9 mph.
Saturday Night: Partly cloudy, with a low around 40. North northeast wind 6 to 8 mph.
Sunday: Sunny, with a high near 60.
Sunday Night: Partly cloudy, with a low around 43.
Monday: Mostly sunny, with a high near 61.
Monday Night: Partly cloudy, with a low around 46.
Tuesday: A slight chance of rain after 11am. Partly sunny, with a high near 64.
Tuesday Night: A chance of rain. Mostly cloudy, with a low around 45.
Wednesday: A chance of rain. Mostly cloudy, with a high near 52.
Wednesday Night: A chance of rain. Mostly cloudy, with a low around 39.
Thursday: A chance of rain. Partly sunny, with a high near 51.

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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 Precipitation?

Home - Education - Precipitation - Precipitation

Precipitation Next Topic: Rain

Precipitation can refer to many different forms of water that may fall from clouds. Precipitation occurs after a cloud has become saturated to the point where its water particles are more dense than the air below the cloud.

In most cases, precipitation will reach the ground, but it is not uncommon for precipitation to evaporate before it reaches the earth's surface. When precipitation evaporates before it contacts the ground it is called Virga. Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog and mist are not considered precipitation because the water vapor which constitutes them isn't dense enough to fall to the ground.

Next Topic: Rain

Weather Topic: What are Shelf Clouds?

Home - Education - Cloud Types - Shelf Clouds

Shelf Clouds Next Topic: Sleet

A shelf cloud is similar to a wall cloud, but forms at the front of a storm cloud, instead of at the rear, where wall clouds form.

A shelf cloud is caused by a series of events set into motion by the advancing storm; first, cool air settles along the ground where precipitation has just fallen. As the cool air is brought in, the warmer air is displaced, and rises above it, because it is less dense. When the warmer air reaches the bottom of the storm cloud, it begins to cool again, and the resulting condensation is a visible shelf cloud.

Next Topic: Sleet