Weather Underground Forecast for Wednesday, February 22, 2012.
Cool and unsettled weather will continue across the Northwest and northern Rockies Wednesday, while another round of snow showers is forecast for the Great Lakes.
Out West, a jet stream that has been stationary over the British Columbia will gradually move south, sending a series of systems through the Western U.S. This will result in continued wet weather from the Pacific Northwest eastward through the Rockies and then into the Central Plains by Thursday morning. Light to moderate rain with mountain snow will persist over portions of the Pacific Northwest and northern Rockies. Moreover, snow and lower elevation rain will develop over parts of the central Rockies Thursday morning. This plume of moisture will translate into the Plains, aiding in producing precipitation across the Central U.S. Thursday.
Moving to the East, another frontal system will move eastward through eastern Canada Wednesday, producing another round of scattered snow showers over the Great Lakes region.
Elsewhere, light rain is possible over parts of the Appalachians and showers and thunderstorms are expected over parts of the Southeast.
From the central and southern Great Plains to the Mid-Atlantic, temperatures are expected to be 15 to 20 degrees above average Wednesday and Thursday before the next trough of low pressure arrives Friday. Temperatures in the Lower 48 states Tuesday have ranged from a morning low of -11 degrees at Presque Isle, Maine to a high of 82 degrees at Harlingen, Texas