Forecast Details for Seattle-Tacoma International Airport, WA

Recent Locations: San Fernando, CA Gering, NE Seattle-Tacoma International Airport, WA

Tonight: Increasing clouds, with a low around 36. North wind around 6 mph becoming calm in the evening.

Thursday: Cloudy through mid morning, then gradual clearing, with a high near 52. South southwest wind 5 to 8 mph.

Thursday Night: A 30 percent chance of rain, mainly after 4am. Increasing clouds, with a low around 40. South wind around 9 mph.

Friday: Rain likely, mainly after 10am. Cloudy, with a high near 48. South wind 7 to 9 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

Friday Night: Rain likely, mainly before 10pm. Mostly cloudy, with a low around 39. South wind 5 to 7 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

Saturday: A 40 percent chance of rain. Mostly cloudy, with a high near 46.

Saturday Night: A 30 percent chance of rain, mainly before 10pm. Mostly cloudy, with a low around 36.

Sunday: A slight chance of rain. Partly sunny, with a high near 46.

Sunday Night: A slight chance of rain and snow after 4am. Mostly cloudy, with a low around 34.

Washington's Birthday: A slight chance of rain and snow before 10am, then a chance of rain. Mostly cloudy, with a high near 46.

Monday Night: A chance of rain and snow. Mostly cloudy, with a low around 35.

Tuesday: A chance of rain and snow. Mostly cloudy, with a high near 47.

Tuesday Night: A chance of rain and snow. Mostly cloudy, with a low around 36.

Wednesday: Rain and snow likely. Mostly cloudy, with a high near 47.

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Current U.S. National Radar--Current

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National Weather Forecast--Current

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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.

Weather Topic: What is Precipitation?

Home - Education - 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