The nation's weather

AP News
Posted: Sep 07, 2012 4:36 AM
The nation's weather

Weather Underground Forecast for Friday, September 07, 2012.

Active weather moves into the Central U.S. on Friday as a low pressure system in Canada creates a cold front that extends southward. This system will stretch from the Upper Midwest and Great Lakes, into the Central and Southern Plains. The leading edge of this frontal boundary will pull abundant moisture in from the the Gulf of Mexico, producing moderate to heavy showers and thunderstorms across the Mid-Mississippi River Valley through the Lower Ohio River Valley. Lighter and more widespread showers and thunderstorms will develop from the Great Lakes and northeast through the Southern Plains. There is a slight risk that these storms will turn severe from Missouri and northern Arkansas, through western Ohio. Strong winds and large hail will be the main concern in these areas. There is a slight chance that a few tornadoes will develop across the region.

South of this frontal boundary, hot and humid conditions will continue across the Southern Plains and Lower Mississippi River Valley. High heat advisories will remain in effect for the region as high temperatures continue to climb into the lower 100s. Ahead of this system, the East Coast will start to dry out as a frontal boundary finally move offshore into the Atlantic Ocean. Expect showers and thunderstorms to persist in parts of Florida and the Carolinas as the tail end of the front lingers over the region throughout the day. Meanwhile in the northern Gulf of Mexico, an area of low pressure remains at a medium, 40 percent chance of tropical cyclone development as it spins just offshore. This may produce a few coastal showers from the Lower Mississippi River Valley through the panhandle of Florida. Temperatures in the Lower 48 states Thursday have ranged from a morning low of 26 degrees at West Yellowstone, Mont. to a high of 105 degrees at Poteau, Okla.