The nation's weather

AP News
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Posted: Sep 04, 2012 4:35 AM
The nation's weather

Weather Underground Forecast for Tuesday, September 04, 2012.

The Eastern half of the nation will see more rainy conditions, as the remnants of Isaac slowly move up the Ohio River Valley and into the Northeast on Tuesday. The system has combined with a frontal boundary which allowed for a broad area of precipitation to develop. Additionally, the system will pull more moisture in from the Atlantic Ocean, creating periods of heavy rainfall and strong winds. Scattered showers and thunderstorms will stretch from the Ohio and Tennessee Valleys through the Eastern Seaboard. Heaviest rainfall and strong thunderstorms are expected to develop from West Virginia through New York State in the afternoon and evening hours. Meanwhile, another cold front will approach this system from the North, as it moves over the Upper Midwest and into the Great Lakes and Midwest. This system is expected to produce scattered showers and thunderstorms, some of which will turn severe with damaging wind gusts and periods of hail.

In the South, high pressure will maintain hot and sunny conditions across the Southern Plains and Lower Mississippi River Valley. High temperatures will reach into the lower 100s for these areas, thus, high heat advisories will remain in effect for the region. Further west, monsoonal moisture over the Four Corners support more widespread scattered thunderstorm activity in the evening. Fire danger will remain high for the Northwestern corner of the nation as high pressure allows for dry, sunny, and warm conditions to continue. Temperatures in the Lower 48 states Monday have ranged from a morning low of 25 degrees at Stanley, Idaho to a high of 105 degrees at Poteau, Okla.