Forecast Details for Mercer Island, WA

Recent Locations: Sour Lake, TX   Sutherland Springs, TX   Mercer Island, WA  
Tonight: A 50 percent chance of rain, mainly before 2am. Mostly cloudy, with a low around 46. South wind 5 to 7 mph.
Friday: Increasing clouds, with a high near 63. South southwest wind 3 to 8 mph.
Friday Night: Mostly cloudy, with a low around 48. South southwest wind 5 to 8 mph becoming light and variable.
Saturday: A 50 percent chance of rain. Mostly cloudy, with a high near 58. South wind around 5 mph becoming northwest in the afternoon.
Saturday Night: A 30 percent chance of rain before 11pm. Mostly cloudy, with a low around 46. North wind around 5 mph becoming calm in the evening.
Sunday: Mostly sunny, with a high near 64.
Sunday Night: Partly cloudy, with a low around 45.
Monday: Mostly sunny, with a high near 67.
Monday Night: A chance of rain after 11pm. Mostly cloudy, with a low around 50.
Tuesday: Rain likely, mainly after 11am. Mostly cloudy, with a high near 61.
Tuesday Night: A chance of rain. Mostly cloudy, with a low around 47.
Wednesday: A chance of rain. Partly sunny, with a high near 61.
Wednesday Night: A slight chance of rain. Mostly cloudy, with a low around 48.
Thursday: A slight chance of rain. Partly sunny, with a high near 62.

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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

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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 Cumulonimbus Clouds?

Home - Education - Cloud Types - Cumulonimbus Clouds

Cumulonimbus Clouds Next Topic: Cumulus Clouds

The final form taken by a growing cumulus cloud is the cumulonimbus cloud, which is very tall and dense. The tower of a cumulonimbus cloud can soar 23 km into the atmosphere, although most commonly they stop growing at an altitude of 6 km.

Even small cumulonimbus clouds appear very large in comparison to other cloud types. They can signal the approach of stormy weather, such as thunderstorms or blizzards.

Next Topic: Cumulus Clouds

Weather Topic: What is Drizzle?

Home - Education - Precipitation - Drizzle

Drizzle Next Topic: Evaporation

Drizzle is precipitation in the form of water droplets which are smaller than raindrops.

Drizzle is characterized by fine, gently falling droplets and typically does not impact human habitation in a negative way. The exception to this is freezing drizzle, a condition where drizzle freezes immediately upon reaching earth's surface. Freezing drizzle is still less dangerous than freezing rain, but can potentially result in hazardous road conditions.

Next Topic: Evaporation