On Sunday, a deep area of low pressure over the Northern/Central Plains moves northeastward into Central Canada on Monday.
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In addition, an upper-level low will develop over the Rockies associated with the front producing higher-elevation snow that will develop over the Northern/Central Rockies and Great Basin.
The higher-elevation snow will result in reduced visibility and hazardous driving conditions.
The winter weather has prompted Winter Storm Warnings and Winter Storm Watches over parts of the Northern Rockies and Northern High Plains into the Eastern Great Basin through Sunday evening.
Overnight Sunday, the snow in the higher elevations will taper off.
However, the snow moves into the Northern Plains on Monday.
Ahead of the front, Temperatures will be 10 to 30 degrees above average over parts of the Plains, Upper/Middle Mississippi Valley, and Upper Great Lakes.
On Sunday, moisture from the Western Gulf of Mexico will stream northward into the Upper Mississippi Valley.
As the front interacts with the moisture, showers and severe thunderstorms will develop by late Sunday.
Therefore, the SPC has issued a Slight Risk of severe thunderstorms over parts of the Middle Missouri Valley through Monday morning.
The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes.
In addition, dry strong gusty wind and low relative humidity will create dangerous fire weather conditions over parts of the Central High Plains on Sunday.
Therefore, the SPC has issued a Critical Risk of fire weather over parts of Central High Plains through Monday morning.
On Monday, the threat of severe thunderstorms moves southward to parts of the Southern Plains and Middle/Lower Mississippi Valley.
Therefore, the SPC has issued a Slight Risk of severe thunderstorms over parts of the Southern Plains and Middle/Lower Mississippi Valley.
The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes.
Furthermore, the showers and thunderstorms will produce heavy rain over the region.
Therefore, the WPC has issued a Slight Risk of excessive rainfall with these thunderstorms over parts of the Southern Plains and Middle/Lower Mississippi Valley from Monday into Tuesday morning.
The associated heavy rain will create mainly localized areas of flash flooding, with urban areas, roads, and small streams the most vulnerable.
As the associated front moves eastward, the rain and showers/thunderstorms move eastward, extending from the Upper Great Lakes southward to the Central Gulf Coast.
As a result, the threat of excessive rainfall decreases slightly over the Middle/Lower Mississippi Valley and Western Ohio Valley.
Therefore, on Tuesday, the WPC has issued a Marginal Risk of excessive rainfall over parts of the Middle/Lower Mississippi Valley and Western Ohio Valley.
The associated heavy rain will create localized areas of flash flooding, affecting areas that experience rapid runoff with heavy rain.
Meanwhile, on Sunday, weak low pressure and associated front off the Mid-Atlantic Coast will steer moisture into the Mid-Atlantic, producing light rain over parts of the Mid-Atlantic Coast into Southern New England Coast by Sunday evening.
Overnight Sunday, moisture moves into New England, producing rain over the region into Monday, with the rain beginning to taper off on Tuesday morning.
Elsewhere, early on Monday, a front moves onshore over the Pacific Northwest, moving inland to the Northern Rockies by Tuesday.
Nevertheless, light rain will develop over parts of the Pacific Northwest Coast overnight Sunday.
As the precipitation moves inland, rain and higher-elevation snow will develop over the region on Monday.
Snow returns to the Northern Rockies on Tuesday. ■
A hyperactive weather pattern will bring an expansive low pressure system across mainland U.S., resulting in widespread impactful weather to progress from west to east across the country through the next few days.