Forecast Details for Mercer Island, WA

Recent Locations: Hutchinson, KS Columbus, OH Mercer Island, WA

Today: Mostly cloudy, with a high near 74. West wind 3 to 5 mph.

Tonight: Mostly cloudy, with a low around 57. Calm wind becoming south around 5 mph after midnight.

Monday: Cloudy, then gradually becoming mostly sunny, with a high near 75. South wind around 5 mph.

Monday Night: Mostly cloudy, with a low around 58. South wind 3 to 5 mph.

Tuesday: Mostly cloudy, with a high near 76. South southwest wind around 6 mph.

Tuesday Night: A 20 percent chance of rain. Mostly cloudy, with a low around 61.

Wednesday: A 50 percent chance of rain. Cloudy, with a high near 72.

Wednesday Night: Showers likely and possibly a thunderstorm before 11pm, then a chance of rain after 11pm. Cloudy, with a low around 61.

Thursday: A chance of rain. Mostly cloudy, with a high near 72.

Thursday Night: A slight chance of rain before 11pm. Mostly cloudy, with a low around 58.

Friday: Partly sunny, with a high near 76.

Friday Night: Mostly clear, with a low around 58.

Saturday: Sunny, with a high near 80.

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Current U.S. National Radar--Current

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National Weather Forecast--Current

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

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 Altostratus Clouds?

Home - Education - Cloud Types - 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

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