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Chicago firefighters battle a five-alarm blaze in single digit temperatures at a warehouse on the city's South Side, Bridgeport neighborhood Wednesday, Jan. 23, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

Icicles form on a fire hose from single digit temperatures as Chicago firefighters battle a five-alarm blaze in a warehouse on the city's South Side, Bridgeport neighborhood Wednesday, Jan. 23, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

The frozen ice covered pair of gloves belonging to a Chicago firefighter stand on a railing behind him in single digit temperatures during a five-alarm blaze in a warehouse on the city's South Side, Bridgeport neighborhood rages Wednesday, Jan. 23, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

Chicago firefighters battle a five-alarm blaze in single digit temperatures at a warehouse on the city's South Side, Bridgeport neighborhood Wednesday, Jan. 23, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

Chicago firefighters are covered in ice from single digit temperatures as they take a break from a five-alarm blaze in a warehouse on the city's South Side, Bridgeport neighborhood Wednesday, Jan. 23, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

Firefighters spray down hot spots on an ice covered warehouse that caught fire Tuesday night in Chicago January 23, 2013. Fire department officials said it is the biggest fire the department has had to battle in years and one-third of all Chicago firefighters were on the scene at one point or another trying to put out the flames. An Arctic blast continues to gripped the U.S. Midwest and Northeast Wednesday, with at least three deaths linked to the frigid weather, and fierce winds made some locations feel as cold as 50 degrees below zero Fahrenheit. (minus 46 degrees Celsius) REUTERS/John Gress

Firefighters spray down hot spots on an ice covered warehouse that caught fire Tuesday night in Chicago January 23, 2013. Fire department officials said it is the biggest fire the department has had to battle in years and one-third of all Chicago firefighters were on the scene at one point or another trying to put out the flames. An Arctic blast continues to gripped the U.S. Midwest and Northeast Wednesday, with at least three deaths linked to the frigid weather, and fierce winds made some locations feel as cold as 50 degrees below zero Fahrenheit. (minus 46 degrees Celsius) REUTERS/John Gress

A firefighter walks past an ice covered warehouse that caught fire on Tuesday night in Chicago January 23, 2013. Fire department officials said it is the biggest fire the department has had to battle in years and one-third of all Chicago firefighters were on the scene at one point or another trying to put out the flames. An Arctic blast continues to gripped the U.S. Midwest and Northeast Wednesday, with at least three deaths linked to the frigid weather, and fierce winds made some locations feel as cold as 50 degrees below zero Fahrenheit. (minus 46 degrees Celsius) REUTERS/John Gress

Firefighters help to extinguish a massive blaze at a vacant warehouse on January 23, 2013 in Chicago, Illinois. More than 200 firefighters battled a five-alarm fire as temperatures were in the single digits. (Photo by Scott Olson/Getty Images)

Firefighters spray down hot spots on an ice covered warehouse that caught fire Tuesday night in Chicago January 23, 2013. Fire department officials said it is the biggest fire the department has had to battle in years and one-third of all Chicago firefighters were on the scene at one point or another trying to put out the flames. An Arctic blast continues to gripped the U.S. Midwest and Northeast Wednesday, with at least three deaths linked to the frigid weather, and fierce winds made some locations feel as cold as 50 degrees below zero Fahrenheit. (minus 46 degrees Celsius) REUTERS/John Gress

Firefighters spray down hot spots on an ice covered warehouse that caught fire Tuesday night in Chicago January 23, 2013. Fire department officials said it is the biggest fire the department has had to battle in years and one-third of all Chicago firefighters were on the scene at one point or another trying to put out the flames. An Arctic blast continues to gripped the U.S. Midwest and Northeast Wednesday, with at least three deaths linked to the frigid weather, and fierce winds made some locations feel as cold as 50 degrees below zero Fahrenheit. (minus 46 degrees Celsius) REUTERS/John Gress

Firefighters spray down hot spots on an ice covered warehouse that caught fire Tuesday night in Chicago January 23, 2013. Fire department officials said it is the biggest fire the department has had to battle in years and one-third of all Chicago firefighters were on the scene at one point or another trying to put out the flames. An Arctic blast continues to gripped the U.S. Midwest and Northeast Wednesday, with at least three deaths linked to the frigid weather, and fierce winds made some locations feel as cold as 50 degrees below zero Fahrenheit. (minus 46 degrees Celsius) REUTERS/John Gress

Firefighters help to extinguish a massive blaze at a vacant warehouse on January 23, 2013 in Chicago, Illinois. More than 200 firefighters battled a five-alarm fire as temperatures were in the single digits. (Photo by Scott Olson/Getty Images)

A truck is covered in ice as firefighters help to extinguish a massive blaze at a vacant warehouse on January 23, 2013 in Chicago, Illinois. More than 200 firefighters battled a five-alarm fire as temperatures were in the single digits. (Photo by Scott Olson/Getty Images)

Firefighters help to extinguish a massive blaze at a vacant warehouse on January 23, 2013 in Chicago, Illinois. More than 200 firefighters battled a five-alarm fire as temperatures were in the single digits. (Photo by Scott Olson/Getty Images)

Firefighters help to extinguish a massive blaze at a vacant warehouse on January 23, 2013 in Chicago, Illinois. More than 200 firefighters battled a five-alarm fire as temperatures were in the single digits. (Photo by Scott Olson/Getty Images)

Firefighters help to extinguish a massive blaze at a vacant warehouse on January 23, 2013 in Chicago, Illinois. More than 200 firefighters battled a five-alarm fire as temperatures were in the single digits. (Photo by Scott Olson/Getty Images)