The system that affected the West this past weekend will strengthen as it moves from the Central Plains through the Lower Mississippi Valley on Monday.
As it heads eastward, it will interact with moisture from the Gulf of Mexico. This interaction will translate into increasing rain showers and thunderstorms from southeastern Texas into the Mid-Mississippi and Tennessee Valleys. Cold air will sweep in behind this front across the Central and Southern Plains. Colder air will support chances of snow development in parts of eastern Kansas and lowered daytime highs in the Central and Southern Plains.
Meanwhile, in the West, wet and windy weather will continue in the Pacific Northwest and northern California as a Pacific cold front pushes inland. Moist, onshore flow will spread precipitation from these coastal areas eastward into parts of the Intermountain West and the Northern Rockies through the afternoon. Moisture streaming across the West Coast will continue to fuel more showery weather in the Pacific Northwest even after the front moves eastward. The next Pacific system will reach the Pacific Northwest and northern California coasts Monday night with a mix of rain and snow.
Elsewhere, dry conditions will prevail across the Eastern Seaboard on Monday.
Temperatures in the Lower 48 states Sunday ranged from a morning low of -5 degrees at Aberdeen, S.D., to a high of 86 degrees at Laredo, Texas.
Weather Underground: http://www.wunderground.com
National Weather Service: http://iwin.nws.noaa.gov