A low pressure system will shift across the Southwest on Tuesday, while a cool weather pattern persists over the Northeast.
An area of low pressure will inch south southeastward over the Southwest. This system will stir up showers and thunderstorms across the Southwest, the Great Basin and the Intermountain West. High elevation snow showers will be possible from the Sierra Nevada to the Rockies. Winter weather advisories are in effect for southeast Wyoming and central Colorado. A cold frontal boundary will push east southeast over the southern Plains and the southern Rockies. This frontal boundary will collide with warm and moist air from the Gulf of Mexico. The interaction will lead to heavy rain and strong thunderstorms over the southern Plains, the central Plains, the lower Mississippi Valley, the middle Mississippi Valley, the Southeast and the Mid-Atlantic. Severe thunderstorms will be possible across a large portion of Texas, western Louisiana, southern Arkansas and southeast Oklahoma. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. In addition, heavy rain will bring threats of flash flooding to the region.
Meanwhile, a high pressure system over the northern Plains will expand eastward over the upper Midwest. This system will keep a cool air mass in place from the central Rockies to the central Appalachians. Cold air will support a mixture of rain and snow over northern New England.
Most areas across the Pacific Northwest will experience dry conditions as high pressure builds over the eastern Pacific.
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