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This cold snap comes during a national propane shortage that is impacting Tennessee.

On Tuesday, Governor Bill Haslam declared a state of emergency to make sure propane is available to heat homes across the state.

"This has been a hard winter already for many home and business owners in Tennessee," Haslam said. "This executive order will help families, farmers and businesses get the necessary energy resources to stay warm, stay open and keep operating."

The declaration allows truck drivers carrying propane to work longer hours to transport that important heat source. Normally. commercial drivers are limited to 70 hours behind the wheel a week in stretches of no more than 11 hours a day.

The Tennessee departments of Agriculture, Environment and Conservation, Safety, Transportation, and the Tennessee Emergency Management Agency are coordinating with each other, with other states and with federal authorities to put the exemption in place.