By BRENDAN OBRIEN, Reuters
CHICAGO — A monster winter storm kept its grip on the United States’ Northern Plains and Upper Midwest on Thursday after delivering heavy snows, freezing rains and gusty winds to the central US, leaving hundreds of thousands without power and grounding hundreds of flights.
The broad swath of the northern United States—from Washington state to New England—remained under winter weather advisories. Some spots may see another 18 inches (46 cm) of snow, winds clocking in at 50 miles (80 km) per hour and wind chills equivalent to minus 40 degrees Fahrenheit (-40°C) throughout the day, the National Weather Service said.
At the same time, parts of the Ohio Valley and the South could s