The nation's weather

Weather Underground Forecast for Wednesday, July 25, 2012.

A low pressure system over the Northern Plains is expected to move eastward Wednesday and Thursday and become the main weather producer for the nation. Showers and thunderstorms will continue from the Northern and Central Plains to the Great Lakes and Ohio Valley. In particular, a slight risk of severe thunderstorms is expected from the Upper Mississippi and Mid-Missouri valleys across the Great Lakes, with the main threat of hail and damaging winds.

Apart from this system, a frontal boundary will remain over the Mid-Atlantic and parts of the Tennessee Valley and Southeast. Showers and thunderstorms are anticipated with this system.

Elsewhere, unsettled weather will persist over portions of the Gulf States. Expect showers and thunderstorms to become more widespread in the afternoon and evening especially over the coastal region. In addition, monsoonal flow will keep scattered showers and thunderstorms going over the Four Corners region. Farther north, a weak front in the northern Intermountain West may trigger a few showers and thunderstorms.

Another hot day is in store for portions of the Central Plains, Mississippi Valley and Ohio Valley Wednesday and Thursday. Afternoon temperatures are expected in the 100s with possible heat indicies 105 to 110. Moreover, minimum nighttime temperatures will only fall into the mid-70s. Temperatures in the Lower 48 states Tuesday have ranged from a morning low of 34 degrees at Meacham, Ore. to a high of 107 degrees at Olney-Noble, Ill.

Source: http://news.yahoo.com/nations-weather-094902441.html

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