Forecast Details for Mercer Island, WA

Recent Locations: Mercer Island, WA  
Tonight: A 30 percent chance of snow after 2am. Mostly cloudy, with a low around 32. Light south southeast wind. Total nighttime snow accumulation of less than a half inch possible.
Saturday: Snow likely, possibly mixed with rain before 2pm, then a chance of rain. Cloudy, with a high near 40. Calm wind. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.
Saturday Night: A 30 percent chance of rain before 10pm. Mostly cloudy, with a low around 31. Calm wind.
Sunday: A 20 percent chance of snow. Partly sunny, with a high near 40. Calm wind.
Sunday Night: Partly cloudy, with a low around 26. Calm wind.
Monday: Mostly sunny, with a high near 39.
Monday Night: Mostly clear, with a low around 20.
Tuesday: Sunny, with a high near 37.
Tuesday Night: Mostly clear, with a low around 20.
Wednesday: A slight chance of snow after 4pm. Mostly sunny, with a high near 38.
Wednesday Night: A chance of snow. Mostly cloudy, with a low around 25.
Thursday: Rain and snow likely. Mostly cloudy, with a high near 39.
Thursday Night: Rain and snow likely. Mostly cloudy, with a low around 30.
Friday: A chance of rain and snow. Mostly cloudy, with a high near 42.

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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

The Current National Weather Forecast and National Weather Map are shown below.

Today's National Weather Map

National Weather Forecast for Tomorrow

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

Tomorrows National Weather Map

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 Altostratus Clouds?

Home - Education - Cloud Types - Altostratus Clouds

Altostratus Clouds Next Topic: Cirrocumulus Clouds

Altostratus clouds form at mid to high-level altitudes (between 2 and 7 km) and are created by a warm, stable air mass which causes water vapor to condense as it rise through the atmosphere. Usually altostratus clouds are featureless sheets characterized by a uniform color.

In some cases, wind punching through the cloud formation may give it a waved appearance, called altostratus undulatus. Altostratus clouds are commonly seen with other cloud formations accompanying them.

Next Topic: Cirrocumulus Clouds

Weather Topic: What are Cirrostratus Clouds?

Home - Education - Cloud Types - Cirrostratus Clouds

Cirrostratus Clouds Next Topic: Cirrus Clouds

Cirrostratus clouds are high, thin clouds that form above 20,000 feet and are made mostly of ice crystals. They sometimes look like giant feathers, horse tails, or curls of hair in the sky. These clouds are pushed by the jet stream and can move at high speeds reaching 100 mph.

What do they indicate?
They indicate that a precipitation is likely within 24 hours.

Next Topic: Cirrus Clouds