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Weather Underground Forecast for Wednesday, July 23, 2014

A cold frontal boundary will extend from the central Plains to the eastern Great Lakes on Wednesday, while monsoonal thunderstorms will make a return to the Four Corners.

A cold front will stretch across the central Plains, the middle Mississippi Valley, the Ohio Valley and the eastern Great Lakes on Wednesday. As this cold front overruns a warm, humid air mass, strong to severe thunderstorms will develop across the Northeast. Severe thunderstorms will be possible over eastern New York, western Massachusetts, Vermont, New Hampshire and Maine. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. Severe thunderstorms will also be possible along the western side of the cold front, focusing over northwest Montana. In addition, widespread rain and thunderstorms will develop along this frontal boundary over the northern and central Plains, the middle Mississippi Valley, the Ohio Valley and the Mid-Atlantic. To the south of this cold front, an onshore flow from the Gulf of Mexico will trigger thunderstorm activity over the Gulf Coast, the Deep South and the Tennessee Valley. Sea breeze induced thunderstorms will also be possible over the Southeast.

Meanwhile, monsoonal moisture will bring a chance of scattered showers and thunderstorm to the southern Rockies, while the Desert Southwest will stay mostly clear of precipitation. A low pressure system over the Pacific Northwest will influence an onshore flow from the Pacific Ocean. This system will fuel rain and thunderstorms across Oregon and Washington on Wednesday.

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