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Weather Underground midday recap for Monday, October 20, 2014
A cold front moved over the West Coast on Monday, while a low pressure system shifted across the Great Lakes.
A cold frontal boundary extended from northern Washington to northwest California. As this system moved slowly eastward, moderate to heavy rain developed from northern California to Washington. Brookings, Ore., reported a midday total of 0.92 inches of rain. Arcata, Calif., reported a midday total of 0.88 inches of rain. In addition, winter weather advisories were issued across the northern Rockies as high elevation snow showers were anticipated across the region. High pressure over the eastern Pacific kept conditions warm and dry across the Desert Southwest. Yuma, Ariz., recorded a midday high of 88 degrees. Needles, Calif., recorded a midday high of 87 degrees.
Meanwhile, a moist air mass pooled northwestward from the Gulf of Mexico. Daytime heating interacted with this moisture, which triggered isolated showers and thunderstorms over southern and western Texas, New Mexico and eastern Arizona. Corpus Christi, Texas, reported a midday total of 1.59 inches of rain. Port Aransas, Texas, reported a midday total of 0.95 inches of rain. An onshore flow from the Atlantic also initiated thunderstorms over the southern tip of Florida.
To the north, a low pressure system pushed eastward over the Great Lakes. This system brought rainy weather to portions of Tennessee Valley, the Ohio Valley, the Mid-Atlantic, the eastern Great Lakes and New England on Monday.