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A cold frontal boundary associated with an area of low pressure stretched from central California to southwest Montana, which brought unsettled weather to the northwestern corner of the country today.

An onshore flow from the Pacific ushered scattered showers across Washington, Idaho, Oregon and northern California, while higher elevations experienced scattered snow showers. Arcata, Calif., reported a midday total of 0.61 inches of rain, while Shelton, Wash., reported a midday total of 0.49 inches.

Winter weather advisories were issued across parts of the Sierra Nevadas and into the Great Basin as precipitation began to spread southeastward.

A ridge of high pressure remained in place over the Four Corners, as warm, dry conditions lingered across the Desert Southwest and the southern Plains. Altus, Oklahoma, recorded a midday high of 99 degrees, while Vernon, Texas, recorded a midday high of 98 degrees.

Meanwhile, a frontal boundary extended from the central Plains to the southern Mid-Atlantic, which kept conditions much cooler across the north central and northeastern portions of the country.

Conditions were especially cool across New England, as Mount Washington, N.H., recorded a morning low of 26 degrees. Scattered showers and thunderstorms also developed over the Ohio Valley and the Mid-Atlantic due to a wave of low pressure across the region. High pressure kept conditions warm and dry across the Gulf Coast and the Southeast.

MONDAY'S WEATHER EXTREMES:

-HIGHEST TEMPERATURE (DEGREES F).........................99 Altus, Okla.

-HIGHEST HEAT INDEX (DEGREES F)..........................99 Maxwell AFB, Ala.

-LOWEST TEMPERATURE (DEGREES F)..........................26 Mt. Washington, N.H.

-LOWEST WIND CHILL (DEGREES F)...........................-4 Wainwright, Alaska

-HIGHEST WIND GUST (MPH).................................56 Mt. Washington, N.H.

-HIGHEST PRECIPITATION (INCHES)..........................0.61 Arcata, Calif.

ON THIS DATE:

-Five people were killed in 1990 as three small fishing boats capsized in the Strait of Juan De Fuca. These people were caught off guard by conditions that quickly changed from calm to 10-foot seas in minutes due to the passage of a speedy Pacific cold front embedded with 60 mph winds.

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