The nation's weather

AP News
Posted: Nov 24, 2009 5:49 AM

Two main weather features were expected to bring active weather to the U.S. on Tuesday.

A low pressure system over the Central U.S. was forecast to strengthen as it moved east throughout the day. Ahead of the system, warm and moist air was expected to push in from the Gulf of Mexico, while cold and dry air could pour in behind the system. This could create a strong cold front that may extend from the Upper Midwest, down the Mississippi River Valley and wrap back westward into the Southern Plains.

The front also was expected to kick up light and scattered showers throughout the day, with up to a half of an inch likely in the upper and mid-Mississippi River Valleys. Less than a tenth of an inch was forecast to fall in lower Mississippi.

Snow over the Central Plains was expected to diminish as dry air moved into the region. Highs in the mid-40s were expected up north, while the Southern Plains could remain in the 60s. Strong winds behind the front were expected to bring gusts of between 25 mph and 30 mph.

Meanwhile, in the East, the incoming trough from the Central U.S. was forecast to push in overcast skies and bring a chance of light sprinkles over the East Coast. The main concern could be fog and its effects on visibility.

The Mid-Atlantic states were expected to see another dreary day with highs in the 60s, while the Northeast could see some lingering showers Tuesday morning.

Out West, a low pressure trough over British Colombia was forecast to push a cold front over the Northern Rockies and Pacific Northwest. This was expected to continue kicking up scattered showers and leave snow in higher elevations. Up to 3 inches of snow was expected with only light rainfall.

Strong winds were expected to accompany this front with gusts of up to 60 mph in northern Montana. Chilly conditions were expected to persist, while California starts to see a warming trend on Tuesday.

On Monday, temperatures in the Lower 48 states ranged from a low of 1 degree in Daniel, Wyo. to a high of 88 degrees in Miami, Fla.