Powerful winter storm that could leave drifts as high as eight feet heads for the Midwest | Mail Online

# Blizzard warnings for Chicago and Milwaukee with winds in excess of 60mph
# FEMA urges residents it is 'critical' to prepare for onslaught
# Major U.S. airlines warn of cancellations and offer flexible rebooking policies
# Fears it could be worse than the Great Chicago Storm of 1967