HOUSTON At least two tornadoes have touched down in Texas on Christmas Day as chunks of the eastern and southern parts of the state remain under a broad tornado watch.

National Weather Service meteorologist Greg Carbin said one tornado was reported in Trinity County and another in Houston County. He said it appears only one building was damaged in the East Texas city of Crockett in Houston County.

Authorities said a powerful storm toppled a tree onto a pickup truck in the Houston area, killing the driver.

Harris County Sheriff's Deputy Thomas Gilliland says the tree fell onto the truck around 9:40 a.m. Tuesday.

He said the man, whose identity has not been released, was pronounced dead at the scene by emergency responders.

The tree was toppled by a storm system that was forecast to bring thunderstorms and tornadoes across the region. Thousands of residents were left without power.

Meanwhile, the Midwest was bracing for heavy snow and ice.

Freezing rain already was blamed for a 21-vehicle pileup in Oklahoma.

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