Grand Coulee, Washington: 1,483 feet (452m) 47°56′23″N 119°0′6″W

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Grand Coulee Area Weather provides the user with a continuously updated weather forecast for the Grand Coulee region of Washington State. Grand Coulee Area Weather fills a void, as we lack local radio or television weather forecasts for our area. Also, there are several links to additional weather data including current weather radar and satellite imagery.

Please remember, Grand Coulee Area Weather is not intended as your only means for weather watches, warnings and special alters. That’s the job of your local and regional officials.

The Grand Coulee region is situated in northeastern Washington State. The communities of Elmer City, Coulee Dam, Grand Coulee and Electric City are close neighbors. In this region of Washington State, the upper Columbia Basin and the lower Okanogan Highlands intersect. The interface can make for some interesting weather and observable microclimates.


Much of the Columbia River Basin experiences the rain shadow effect of the north-south mountain ranges, primarily the Cascades, which block moist winds from the Pacific Ocean. As the air rises, it cools, losing ability to retain moisture. Rain and snowfall on the western side is plentiful, while lands east of the mountains remain arid. Rain shadows are particularly evident where major mountain ranges are perpendicular to the direction of prevailing winds and storm tracks coming from the ocean, as with the Cascades.

Dramatic changes, both climate and geography, occur when one travels from west to east – the lush, moist old-growth forests on the western side of the Cascade Range give way to the arid shrub-steppe environment on the eastern side. Climate varies greatly throughout the basin as elevations range from just above sea level to over 12,795 feet (3,900 m). Annual precipitation can vary from about 9.85 inches (25cm) to 98.45 inches (250cm).

A common feature of the Columbia River Basin is the shrub-steppe ecosystem where moisture is generally scarce (coming mostly from snow in winter), the wind is generally persistent, and temperatures vary from 100°F plus (38°C) in summer to well below freezing in winter. Source: U.S. Department of the Interior, Bureau of Land Management


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