NEW : Wind chill falls to -51 F in Ohio , North Dakota . Freezing an egg at -20 F may be fun , but the bitter cold can be dangerous , too . `` This weather is deadly , '' he wrote , `` and last winter did n't even get close to this cold . '' 15 person is killed in North Dakota accident that involved 15 vehicles . Wind chill advisories and warnings are posted in parts of 86 states .
NEW : Wind chill falls to -51 F in Ohio , North Dakota . Freezing an egg at -20 F may be fun , but the bitter cold can be dangerous , too . 15 person is killed in North Dakota accident that involved 15 vehicles . Wind chill advisories and warnings are posted in parts of 86 states .