The National Weather Service placed at least 15 states under winter storm warnings or advisories as a deep low-pressure system swept east, bringing heavy snow, damaging winds and dangerous wind chills from Montana through the Great Lakes into the Northeast. Forecasters warned of treacherous travel, with gusts topping 50 miles an hour in parts of Minnesota and whiteout conditions forcing closures along key interstate corridors during one of the busiest travel periods of the year.
Farther south, the same sprawling system fueled severe thunderstorms and possible tornadoes across portions of the Midwest and the South, with authorities reporting pockets of structural damage, downed power lines and scattered outages. In Texas, where some areas saw freezing temperatures and sleet, forecasters cautioned that even minor accumulations could slick roads ill-prepared for wintry precipitation.
The West Coast was also not spared from destructive weather this past month. An intense atmospheric river lashed California both just before and during the holiday week, delivering some of the wettest conditions in years to parts of the state and triggering floods, debris flows and mudslides, particularly near recent wildfire burn scars. Emergency crews conducted evacuations in vulnerable canyons as saturated hillsides gave way, while officials warned that additional rounds of rain, on already soaked ground, could prolong the risk well into the new year.
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