A cold front was to trek across the Mississippi Valley Wednesday morning before making its way across the Ohio Valley, the Northeast and the Southeast by the afternoon.

The Great Lakes and the Ohio Valley were to see showers with some scattered thunderstorms possible. Further south, thunderstorms were to roll through the Tennessee Valley down to the Southeast. None of the storms were expected to turn severe, but flooding was a potential threat in areas.

High pressure was to dominate the Northeast, keeping skies clear and allowing temperatures to drop to the 30s and 40s. The first half of the day was to remain mostly clear before clouds and rain were to creep into the mid-Atlantic during the afternoon and the evening hours. New England was forecast to remain mostly dry on Wednesday, with precipitation from the front reaching the region later in the week.

The central Plains was to be mostly clear on Wednesday, although a few clouds were possible across the northern Plains.

In the Northwest, clouds and precipitation were expected Wednesday morning, primarily in Montana, Wyoming, and northern Washington. There was to be at least some partial clearing in the afternoon.

The Southwest was to continue seeing warm and dry conditions.

Temperatures in the Lower 48 states on Tuesday ranged from a low of 14 degrees at Shirley Basin, Wyo., Colo., to a high of 105 degrees at Anaheim, Calif.

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On the Net:

Weather Underground: http://www.wunderground.com

National Weather Service: http://iwin.nws.noaa.gov

Intellicast: http://www.intellicast.com