The fierce weather has caused at least eight deaths and prompted advisories yesterday afternoon in New Mexico and Texas.
As thick, gray clouds covered the Southwest, forecasters said the storm would sweep across the South and towards the Atlantic coast next week, causing problems for holiday travellers.
In New Mexico, authorities and residents braced for the second hit of a one-two punch that had already blanketed parts of the state with snow and freezing rain and caused a rollover accident that killed a 4-year old girl in the eastern part of the state.
In California, where the storm system hit first, prompting flooding and water rescues in recent days, three deaths have been linked to the storms since Thursday.
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Authorities found one body near downed power lines, one man crashed his vehicle into a tree, and a woman was killed when a tree fell on a parked car.
In Arizona, firefighters recovered the body of a man who was swept away by high waters Friday in the Santa Cruz River in the southern part of the state.
In Nevada, snow in high elevations in the rural, eastern part of the state stranded dozens of cars. No fatalities were reported and authorities got the road open again by yesterday.
In Arizona, rain came down yesterday as more than 8,000 cyclists competed in the annual El Tour de Tucson. Also, high school football games, soccer tournaments and parades were cancelled across the state.
Forecasters said parts of both California and Arizona could expect severe weather with winter storm warnings through yesterday. Weather officials said the mountains and the Antelope Valley foothills northeast of Los Angeles were under the most risk.
In Texas, freezing rain and cold temperatures have already hampered travel. Several traffic accidents were reported yesterday, including the fatal crash late Friday that also left several injured in Vega, about 50 kilometres west of Amarillo.