More than 270,000 customers are still without power Monday morning after Winter Storm Diego dropped heavy snow and ice in the South this weekend.

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The storm's impacts began in California last Thursday when heavy rain caused flash flooding in San Diego. Areas affected by recent wildfires experienced mudslides, which forced evacuations in and around the Los Angeles area.

As it moved east, the storm dropped more than 10 inches of snow in Lubbock, Texas. By Sunday morning, people in the Carolinas, Georgia and Tennessee woke up to snow. The snow totals included 24 inches in Whitetop, Virginia. 

(MORE: Diego's Impacts State-by-State)At least one person was killed in the storm when a tree fell on a car in Matthews, North Carolina, Sunday afternoon.

“This is a snowstorm, not a snow fall,” said Gov. Roy Cooper had warned earlier at a press conference. “It’s serious.” 

Many school districts cancelled school on Monday as roads remain trecherous. Winter storm warnings and winter weather advisories remain in place from the southern Appalachians to the adjacent Piedmont. While Diego is mostly finished, some lingering pockets of snow, sleet and freezing rain may continue in parts of the southern Appalachians and adjacent Piedmont region, including eastern Tennessee, far northeastern Georgia, western and central North Carolina, north-central South Carolina and far southern Virginia. 

Plummeting overnight temperatures may create black ice Tuesday morning from eastern Alabama into north Georgia and eastern North Carolina.