Forecast Details for Mercer Island, WA

Recent Locations: Mercer Island, WA  
Tonight: Rain, mainly before 3am. Steady temperature around 49. South wind around 13 mph, with gusts as high as 23 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday: Rain likely after 4pm. Partly sunny, with a high near 53. South wind around 7 mph becoming east northeast in the afternoon. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Monday Night: Rain. Steady temperature around 49. South southeast wind 14 to 20 mph, with gusts as high as 23 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
Tuesday: Rain. High near 51. South southwest wind around 11 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday Night: Rain likely, mainly before 10pm. Mostly cloudy, with a low around 42. South wind around 10 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Christmas Day: Rain, mainly after 10am. High near 47. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday Night: Rain. Low around 43. Chance of precipitation is 100%.
Thursday: Rain. Cloudy, with a high near 49.
Thursday Night: Rain. Cloudy, with a low around 45.
Friday: Rain. Cloudy, with a high near 50.
Friday Night: Rain. Cloudy, with a low around 44.
Saturday: Rain. Mostly cloudy, with a high near 51.
Saturday Night: Rain. Mostly cloudy, with a low around 43.
Sunday: Rain. Cloudy, with a high near 48.

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Current U.S. National Radar--Current

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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 Nimbostratus Clouds?

Home - Education - Cloud Types - Nimbostratus Clouds

Nimbostratus Clouds Next Topic: Precipitation

A nimbostratus cloud is similar to a stratus cloud in its formless, smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud, because it is thicker.

Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat of moderate to heavy precipitation. In some cases, the precipitation may evaporate before reaching the ground, a phenomenon known as virga.

Next Topic: Precipitation

Weather Topic: What is Rain?

Home - Education - Precipitation - Rain

Rain Next Topic: Shelf Clouds

Precipitation in the form of water droplets is called rain. Rain generally has a tendency to fall with less intensity over a greater period of time, and when rainfall is more severe it is usually less sustained.

Rain is the most common form of precipitation and happens with greater frequency depending on the season and regional influences. Cities have been shown to have an observable effect on rainfall, due to an effect called the urban heat island. Compared to upwind, monthly rainfall between twenty and forty miles downwind of cities is 30% greater.

Next Topic: Shelf Clouds