Forecast Details for Seattle-Tacoma International Airport, WA

Recent Locations: Seattle-Tacoma International Airport, WA Barcelonaâ€“El Prat Airport, 56 Miami International Airport, FL

Tonight: Rain showers likely, possibly mixing with snow after 8pm, then gradually ending. Cloudy during the early evening, then gradual clearing, with a low around 33. West northwest wind 5 to 9 mph becoming light and variable after midnight. Chance of precipitation is 60%. Little or no snow accumulation expected.

Monday: Sunny, with a high near 50. Calm wind becoming north around 6 mph in the afternoon.

Monday Night: Increasing clouds, with a low around 33. North wind 6 to 8 mph.

Tuesday: Mostly cloudy, with a high near 55. North northwest wind around 5 mph.

Tuesday Night: A 20 percent chance of rain after 11pm. Mostly cloudy, with a low around 40. West wind around 6 mph becoming south in the evening.

Wednesday: Rain. High near 50. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

Wednesday Night: Rain, mainly before 11pm, then a chance of showers after midnight. Low around 40. Chance of precipitation is 90%.

Thursday: Showers likely, mainly after 11am. Mostly cloudy, with a high near 52.

Thursday Night: A slight chance of showers before 11pm. Mostly cloudy, with a low around 40.

Friday: A slight chance of showers after 11am. Partly sunny, with a high near 56.

Friday Night: Partly cloudy, with a low around 41.

Saturday: Mostly sunny, with a high near 58.

Saturday Night: Mostly cloudy, with a low around 42.

Sunday: Partly sunny, with a high near 60.

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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

Tomorrow National Weather Forecast and Tomorrow National Weather Map are show below.

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 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

Weather Topic: What is Snow?

Home - Education - Precipitation - Snow

Snow Next Topic: Stratocumulus Clouds

Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake, has unique characteristics, but all of them grow in a hexagonal structure. Snowfall can last for sustained periods of time and result in significant buildup of snow on the ground.

On the earth's surface, snow starts out light and powdery, but as it begins to melt it tends to become more granular, producing small bits of ice which have the consistency of sand. After several cycles of melting and freezing, snow can become very dense and ice-like, commonly known as snow pack.

Next Topic: Stratocumulus Clouds