Unsettled weather conditions will persist in the southeastern quadrant of the nation on Tuesday as a frontal boundary extends from the Mid-Atlantic through the Southern Plains with waves of low pressure. Moisture pooling along this system will produce rain and thunderstorms in these regions through the afternoon. Strong storms from parts of southeastern Texas through the southeastern states and into the southern Ohio Valley may turn severe with damaging wind gusts and even tornadoes. This system is expected to transition by Tuesday evening, extending from the Mid-Atlantic through the Ohio Valley as a warm front and extending from the Mid-Mississippi Valley through the Southern Plains as a cold front.
In the West, the second and much stronger frontal system of this week's series will move into the Pacific Northwest late Monday night into Tuesday. This system created strong coastal wind and spread light to moderate rain and mountain snow across the region. Periods of heavy snow with accumulations of 1 to 2.5 feet are expected in the northern Cascades. New snow amounts of 8 to 16 inches are expected in central Washington, while up to 10 inches blankets the Olympic Mountains. Temperatures in the Lower 48 states Monday have ranged from a morning low of -4 degrees at Hibbing, Minn. to a high of 93 degrees at Austin Bergstrom, Texas.