Forecast Details for Seattle-Tacoma International Airport, WA

Overnight: A 30 percent chance of snow, mainly after 5am. Cloudy, with a low around 31. North northeast wind around 5 mph. Total nighttime snow accumulation of less than a half inch possible.
Friday: A chance of rain and snow, mainly before 10am. Mostly cloudy, with a high near 42. Southeast wind 5 to 8 mph becoming south southwest in the morning. Chance of precipitation is 50%. New snow accumulation of less than a half inch possible.
Friday Night: A 20 percent chance of rain after 2am. Increasing clouds, with a low around 35. South wind around 7 mph.
Saturday: Rain likely, mainly after 10am. Cloudy, with a high near 44. South southeast wind around 5 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Saturday Night: Rain. Low around 38. East southeast wind 5 to 7 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday: Rain. High near 47. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night: Rain. Low around 41. Chance of precipitation is 90%.
Washington's Birthday: Rain likely, mainly before 10am. Cloudy, with a high near 48.
Monday Night: A chance of rain. Mostly cloudy, with a low around 41.
Tuesday: A chance of rain. Mostly cloudy, with a high near 50.
Tuesday Night: Rain likely. Mostly cloudy, with a low around 40.
Wednesday: Rain. Cloudy, with a high near 48.
Wednesday Night: Rain likely. Mostly cloudy, with a low around 40.
Thursday: Rain likely. Mostly cloudy, with a high near 50.

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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

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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 are Cirrus Clouds?

Home - Education - Cloud Types - Cirrus Clouds

Cirrus Clouds Next Topic: Condensation

Cirrus clouds are high-level clouds that occur above 20,000 feet and are composed mainly of ice crystals. They are thin and wispy in appearance.

What do they indicate?
They are often the first sign of an approaching storm.

Next Topic: Condensation

Weather Topic: What are Contrails?

Home - Education - Cloud Types - Contrails

Contrails Next Topic: Cumulonimbus Clouds

A contrail is an artificial cloud, created by the passing of an aircraft.

Contrails form because water vapor in the exhaust of aircraft engines is suspended in the air under certain temperatures and humidity conditions. These contrails are called exhaust contrails.

Another type of contrail can form due to a temporary reduction in air pressure moving over the plane's surface, causing condensation. These are called aerodynamic contrails.

When you can see your breath on a cold day, it is also because of condensation. The reason contrails last longer than the condensation from your breath is because the water in contrails freezes into ice particles.

Next Topic: Cumulonimbus Clouds