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Weather Underground Forecast for Sunday, July 05, 2015
A cold frontal boundary will extend from the Northwest to the northern Plains on Sunday, while a stationary front will stretch from the Mid-Atlantic to the Mississippi Valley.
A cold front will dip southward over the Pacific Northwest, the upper Intermountain West and the northern Plains. This frontal boundary will bring a bit of a cool down to the Northwest. In addition, strong to severe thunderstorms will develop from the northern Rockies to the upper Midwest. Severe thunderstorms will be possible in Nebraska, South Dakota, southeast North Dakota, southeast Minnesota and northwest Iowa. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. In addition, heavy rain will bring threats of flash flooding to eastern South Dakota, southeast North Dakota, western Minnesota.
Monsoonal moisture and daytime heating will aid in the development of showers and thunderstorms over the Four Corners. There will also be chances of afternoon thunderstorms along favorable mountain terrain from the Sierra Nevada to the Wasatch.
To the east, a stationary front will extend westward from the Mid-Atlantic to the lower Mississippi Valley. An onshore flow from the Gulf of Mexico will bring warm, muggy air to the Deep South and the Southeast. Rain and thunderstorms are forecast to develop across the region on Sunday. The Ohio Valley and the Great Lakes region will stay relatively clear of precipitation.