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Weather Underground Forecast for Monday, April 21, 2014
A cold frontal boundary will extend from the Intermountain West to the Great Lakes on Monday, while a separate cold front will move over the West Coast.
An area of low pressure will continue to trek eastward over the central third of the country on Monday. This system will bring rain and thunderstorms to the upper Midwest, the upper Mississippi Valley, the Ohio Valley and the western Great Lakes. Just to the south of this system, a separate wave of low pressure will bring more organized showers and thunderstorms to the southern Plains, the lower Mississippi Valley and the Tennessee Valley. Strong to severe thunderstorms are forecast to develop over central and eastern Texas as a result of this system. As a cold front shifts across the Plains and the Midwest, temperatures are forecast to drop 10 to 20 degrees behind the frontal boundary. The Eastern Seaboard will stay mostly clear of wet weather on Sunday due to high pressure over the Mid-Atlantic coast.
Out west, a cold front will move over the northwestern corner of the country. This system will usher rainy weather across Washington, Oregon and northern California, while snow showers are expected across the Cascades. By Monday afternoon and evening, a mixture of rain and snow will shift over the northern Rockies. The Desert Southwest will stay warm and dry due to high pressure over the coast of southern California. Temperatures will range between the 80s and 90s across the region.