US

Weather Underground Forecast for Wednesday, July 09, 2008.

A low pressure system tracking across the Great Lakes will produce a cold front that will extend down the Ohio Valley and into the Southern Plains on Wednesday. Severe weather is likely to pop up along the front and is expected to move east throughout the day and will approach New England Wednesday afternoon and evening. The strongest storms will track along a trough of low pressure ahead of the front, which will pass through Missouri and Illinois, and will likely cause flooding problems. Expect slightly cooler temperatures as this system brings in cooler air from the north.

To the south, afternoon showers and thunderstorms are expected on Wednesday. High pressure continues to dominate the region, bringing warm and moist air into the region from the Gulf. The frontal storms to the north are not expected to reach the Gulf states region on Wednesday. Mid-Atlantic states however, are likely to see wet conditions as the front reaches the East Coast on Wednesday afternoon.

The West Coast will remain hot on Wednesday because high pressure continues to build across the region. Multiple excessive heat warnings are in effect for California, while the Pacific Northwest continues to see pleasant weather with warm and sunny conditions. The Southwest could see high scattered showers and thunderstorms again on Wednesday. Gusty winds, intense downpours, and hail are likely and will cause flooding issues.

Temperatures in the Lower 48 states Tuesday ranged from a low of 35 degrees at Yellowstone Lake Wyo. to a high of 126 degrees at Death Valley, Calif.