dumped a foot and a half of snow across the region, leaving many highways littered with car accidents. traveling by air, you may want to reconsider. more than 1,500 flights were canceled at o'hare airport. >> it's crazy. but there's nothing -- it's the weather. >> reporter: in minneapolis, temperatures are expected to drop 15 degrees with a low of 2 degrees, making it even harder for the workers to start fixing the metrodome's inflated roof, which collapsed sunday under the weight of nearly a foot and a half of snow. the arctic grip is reaching to florida, sending residents there to stores in search of space heaters. clayton sandell, abc news, minneapolis. citrus farmers in florida are scrambling overnight to protect their trees from the effects of that hard freeze. temperatures are expected to plunge well into the 20s, which can actually doom the fragile fruit. farmers have turned on irrigation systems now to protect their crops. warm water sprayed on the ground creates a warming fog around all those trees. all those frigid temps are