Weather Underground Forecast for Thursday, December 22, 2011.
More wet and active weather is expected in the eastern third of the nation as the storm system over the Ohio Valley lifts northeastward across the Lower Great Lakes and Northeast. Light snow showers in the northern Northeast will taper off during the early morning, while light to moderate scattered rain showers persist in the region through much of the day. Precipitation south of this system, from southern New England and the northern Mid-Atlantic, will wind down during the morning as the northern half of an associated cold front exits the East Coast. Further south, scattered rain showers and thunderstorms will develop near the southern half of this front as it extends from the southern Mid-Atlantic through central and eastern Gulf Coasts. A wave of low pressure developing off the western Gulf Coast Wednesday night will pull gulf moisture into Texas and the Lower Mississippi and Tennessee Valleys, triggering rain and thunderstorms through the day. This activity will spread into the Mid-Atlantic during the latter half of the day. As storms progress eastward areas of Louisiana, Mississippi, and Arkansas may experience severe weather activity with damaging wind gusts and isolated tornadoes.
To the north and west of this activity, another cold front extending from the Upper Great Lakes through the Central Rockies will drop south-southeastward through the day. Light snow showers will continue behind this front in Iowa, Wisconsin and Michigan. More substantial snowfall is anticipated on the western edge of this disturbance in the Northern and Central Rockies and High Plains. Snow accumulations of 3 -6 inches will be possible in the Plains and up to 6-10 should be expected in the mountains. Further south, a Winter Storm Watch is in effect for much of New Mexico with possible snow accumulations of 4-8 inches on top of recent snowfall. Temperatures in the Lower 48 states Wednesday have ranged from a morning low of 1 degrees at Lamar, Colo. to a high of 82 degrees at Fort Myers, Fla.