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Drought Intensifies in Western/Midwest States

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September 5, 2013 by   - () Leave a Comment

Weather Summary: The week commenced with high pressure over the Southeast and storm systems traversing across the northern U.S. As the week progressed, the high pressure system traveled westward, settling over the south-central Plains while a trough of low pressure and associated cold front brought scattered showers and thunderstorms to the eastern third of the Nation.

A weak frontal system generated scattered showers in the Pacific Northwest. In the Southwest, tropical moisture from Tropical Storm Juliette (which dissipated off central Baja California) helped to fuel the southwest monsoon in Arizona, Nevada, Utah, and southern Idaho. Decent showers also fell on parts of New Mexico and Colorado. Hit and miss showers also fell on parts of the northern Plains and upper Midwest, the central Great Plains, and south-central Texas.

Unsettled weather and decent precipitation also affected most of Alaska, with many stations reporting weekly totals exceeding 2 inches in southwestern and south-central sections of the state.

In contrast, little or no rain fell on most of California, Oregon and eastern Washington, parts of the Plains, most of the Mississippi Valley and much of Hawaii. Weekly temperatures averaged well above normal (6 to 10 deg F.) across much of the contiguous U.S., with the exception of seasonable readings in the desert Southwest and Southeast. Highs topped triple-digits in the southern two-thirds of the Plains, southern Iowa and northern Missouri.

Looking Ahead: During Sept. 4-9, rainfall is forecast to be along the borders of the contiguous U.S., namely in the Northwest, the Great Lakes region into New England, along the Gulf Coast (Texas to Florida), and in the Southwest. Unseasonable warmth is predicted for much of the country, but especially in the North-Central States.

For the ensuing five days (Sept. 10-14), odds for above normal precipitation are greatest in the Southwest, Great Lakes region, Appalachians and southeastern Alaska. Subnormal rainfall probabilities are highest in the Northwest, southern Plains and lower Mississippi Valley, coastal New England, and western Alaska. Temperatures are expected to be above normal in the western two-thirds of the U.S., Southeast, and southeastern Alaska.

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