Forecast Details for Seattle-Tacoma International Airport, WA (SEA)

Overnight: Mostly cloudy, with a low around 60. South southwest wind 7 to 10 mph.
Wednesday: Showers. High near 67. South wind 6 to 13 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday Night: Showers likely, mainly before midnight. Mostly cloudy, with a low around 57. South southwest wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Thursday: A 20 percent chance of showers before noon. Mostly cloudy, with a high near 73. South southwest wind 7 to 10 mph becoming northwest in the afternoon.
Thursday Night: Partly cloudy, with a low around 58. North wind around 14 mph.
Friday: Partly sunny, with a high near 74.
Friday Night: Partly cloudy, with a low around 57.
Saturday: A slight chance of showers after noon. Partly sunny, with a high near 74.
Saturday Night: Mostly cloudy, with a low around 59.
Sunday: Partly sunny, with a high near 74.
Sunday Night: Partly cloudy, with a low around 58.
Monday: Mostly sunny, with a high near 76.
Monday Night: Mostly clear, with a low around 58.
Tuesday: Sunny, with a high near 80.

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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 is Sleet?

Home - Education - Precipitation - Sleet

sleet Next Topic: Snow

Sleet is a form of precipitation in which small ice pellets are the primary components. These ice pellets are smaller and more translucent than hailstones, and harder than graupel. Sleet is caused by specific atmospheric conditions and therefore typically doesn't last for extended periods of time.

The condition which leads to sleet formation requires a warmer body of air to be wedged in between two sub-freezing bodies of air. When snow falls through a warmer layer of air it melts, and as it falls through the next sub-freezing body of air it freezes again, forming ice pellets known as sleet. In some cases, water droplets don't have time to freeze before reaching the surface and the result is freezing rain.

Next Topic: Snow