Caitlin Checkeroski walks her dog, Oscar, a Border Collie mix, in unseasonably warm temperatures along Lake Michigan Tuesday, Jan. 29, 2013, in Chicago. Unseasonably warm temperatures broke records in the Chicago area with thunderstorm expected to usher in freezing temperatures and snow Wednesday. (AP Photo/Charles Rex Arbogast)

Associated Press
Caitlin Checkeroski walks her dog, Oscar, a Border Collie mix, in unseasonably warm temperatures along Lake Michigan Tuesday, Jan. 29, 2013, in Chicago. Unseasonably warm temperatures broke records in the Chicago area with thunderstorm expected to usher in freezing temperatures and snow Wednesday. (AP Photo/Charles Rex Arbogast)
Caitlin Checkeroski walks her dog, Oscar, a Border Collie mix, in unseasonably warm temperatures along Lake Michigan Tuesday, Jan. 29, 2013, in Chicago. Unseasonably warm temperatures broke records in the Chicago area with thunderstorm expected to usher in freezing temperatures and snow Wednesday. (AP Photo/Charles Rex Arbogast)
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