At least nine people were killed across the country are exposed polar air that hit North America in recent days .
Authorities have warned half of the United States to be aware of the cold wind or cold weather warning .
Temperatures are expected to reach 14 to 19 degrees Celsius below normal temperatures , from the Midwest to the Southeast , the National Weather Service said as quoted by Reuters .
PJM Interconnection , the agency supplies the electrical energy to the mid - Atlantic region and parts of the Midwest , said that the power supply is struggling to meet soaring demand when cold air forced some power plants shut down .
The cold air that is currently happening is very extreme , said Michael Kormos , PJM Interconnection vice president of operations .
Oil refineries are also affected, including those of Marathon Petroleum Corp. and Exxon Mobil Corp. .
In Oklahoma , the reduced supply of propane due to extreme weather forcing Gov. Mary Fallin declared a state of emergency and ignore the license requirements for transportation companies outside the state in order to make them go in carrying propane .
Places reservoir homeless and government buildings into a shelter ornag ones cold .
Daniel Dashner , 33 -year -old bum who usually sleeps under a bridge in Milwaukee , said she fled to a shelter Monday night .
" Usually if I had four or five blankets , then I could stay warm , ta [ i when the cold wind blows , I did not care how many blankets I had , my piercing cold wind high , " he said when the air temperature drops to minus 21 degrees Celsius .
Frozen and polar vortex air which affects 240 million people in the United States and southern Canada will disappear in the second half of this week .
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