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Weather Underground Forecast for Wednesday, September 02, 2015

A cold front will move across the Northwest on Wednesday, while a trough of low pressure shifts over the Midwest.

A cold frontal boundary will move eastward over the Pacific Northwest and the upper Intermountain West. This system will generate showers and thunderstorms over the northern Rockies on Wednesday. An onshore flow from the Pacific will fuel light to moderate rain over Washington and Oregon. Additionally, monsoonal moisture and daytime heating will initiate showers and thunderstorms across the central and southern Rockies. High pressure will keep weather conditions quiet over the Great Basin and the Desert Southwest.

Meanwhile, a weak trough of low pressure will push east southeastward over the Ohio Valley and the Mid-Atlantic. This system will carry showers and stray thunderstorms over the region. Scattered showers and thunderstorms will also be possible from the central Plains to the Great Lakes.

To the south, a pocket of energy will generate rain and thunderstorms along the western Gulf Coast and into the lower Mississippi Valley. Just to the east, a moist air mass will linger over the Southeast. This will allow from showers and thunderstorms to fire up over the southern Mid-Atlantic and the Southeast on Wednesday.

A cold frontal boundary will dip south southeastward over southern Canada. Showers and thunderstorms will develop ahead of this frontal system over northern New England. High pressure will keep southern New England and the northern Mid-Atlantic clear of precipitation.


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