Ontario Provincial Police initially reported about 360 vehicles and about 300 people had been stranded near Sarnia, Ontario, on Highway 402 -- a major thoroughfare linking the U.S.-Canada border to London, Ontario.  Some of those people have since been rescued, but Sarnia Mayor Mike Bradley said it could be 24 hours before everyone is taken to safety.  The Canadian military assigned a CC-130 Hercules airplane and two CH-146 Griffons helicopters to the search and rescue effort, which also includes snowmobiles and four-wheel-drive vehicles from the provincial police.  Bradley said truckers stranded by the storm have invited some motorists to shelter with them in their rigs, and nearby residents have also opened their homes to stranded motorists.  He reiterated police warnings not to travel through the region.  "This is probably the most brutal storm we have had in 25 years," he said.  Meanwhile, wintry weather continued its assault Tuesday on the Eastern United States with another hard freeze on tap for the deep South and as much as two more feet of snow in portions of New York and Pennsylvania.  Even northwest Indiana, already buried under as much as two feet of snow and the site of numerous motorist strandings Sunday and Monday, was expected to get another taste of blinding lake effect snow on Tuesday, according to the National Weather Service.  And temperatures will only get colder, CNN meteorologist Jennifer Delgado said.  Cold arctic air is expected to cover the eastern United States through Tuesday, according to Delgado. Florida is expected to shiver through wind chills ranging from 5 to 23 degrees.
Canadian police and military teams were working Tuesday afternoon to rescue about 300 people stranded after what a local official termed the most brutal storm to hit the Ontario region in 25...