At least 11 people have died in tornadoes across northern Texas, raising the death toll to 29 after a week of extreme weather targeting the US.
Eight were found dead in Garland in Dallas on Sunday morning (local time), 15 were hurt, and 600 structures were damaged, according to CNN.
Another three deaths were reported in Collin County, including an infant.
The EF-4 tornado hit Garland, with gusts up to 321km/h, while an EF-2 tornado struck Copeville, with gusts up to 265km/h.
Texas Governor Greg Abbott has declared a disaster in four counties, including Dallas County which covers Garland, and Rockwall County which covers Rowlett, CNN reports.
The same storm system has swept across 20 states from New Mexico to Michigan and Georgia, all with some form of weather watch in place.
Meanwhile, six people have died in flash floods in Missouri overnight, and tornadoes have been spotted in Arkansas.
Temperatures remain scattered, with Dallas reaching a high of 27 degC on Saturday, but freezing temperatures forecast for Monday (local time).
Blizzard warnings are also issued for eastern New Mexico, with snow expected to reach more than 20cm.
Some parts of New Mexico have already seen more than 40cm of snow. Governor Susana Martinez declared a state of emergency on Sunday in response to the snowstorm, CNN reports.
There have been more than 8000 power outages across Oklahoma, as crews treat highways and bridges with salt and sand.
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