The nation's weather

AP News
Posted: Aug 03, 2011 4:56 AM
The nation's weather

Weather Underground Forecast for Wednesday, August 03, 2011.

Multiple areas of active weather will persist across the nation on Wednesday, while the South will continue to see hot a humid weather. A low pressure system will move out of the Upper Midwest into the Upper Great Lakes bringing heavy showers and thunderstorms. Heavy downpours, strong winds, and possible hail will be associated with these storms throughout the day. The rotation of this system will push a cold front extending from the Ohio Valley to the Southern Plains kicking up scattered showers and thunderstorms. This front will help cool temperatures from the Mid-Mississippi Valley to the Mid-Atlantic.

In the South, high pressure spinning over the Gulf of Mexico will push moisture onshore triggering coastal showers for most of the Gulf states. Meanwhile, a ridge of high pressure positioned over the Southeast will contribute to hot and humid temperatures across the region and the Southern Plains. Temperatures will reach over 100 degrees, with heat indices reaching 120.

To the west, monsoon moisture flowing into the Four Corners region, in combination with a surface low, will produce moderate to heavy rainfall extending into the Central Rockies. These storms will move slowly through the region causing the potential for flash flooding in some areas. Meanwhile, the West Coast will continue to see mostly sunny skies with morning fog and clouds on the coastline. Temperatures in the Lower 48 states Tuesday have ranged from a morning low of 32 degrees at Meacham, Ore. to a high of 109 degrees at Pauls Valley, Okla.