MINNEAPOLIS (AP) — The Latest on the winter storm causing travel headaches in the Upper Midwest (all times local):

10:50 a.m.

Runways at Minneapolis-St. Paul International Airport were temporarily closed as fast-falling snow from the latest winter storm tested plow drivers who tried to keep up.

MSP spokesman John Welbes says “the rate of snowfall is the challenge.” Forecasters expected snowfall rates of an inch per hour with accumulations of up to 10 inches.

Minneapolis and St. Paul schools are among the scores of districts in Minnesota, Wisconsin and elsewhere that canceled classes Wednesday.

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6:11 a.m.

Forecasters are warning residents in parts of Minnesota and western Wisconsin the advancing winter storm could produce up to 9 inches of snow.

Minneapolis and St. Paul schools are among scores of districts that canceled classes Wednesday. The National Weather Service issued a winter storm warning for much of central and southern Minnesota, through eastern South Dakota and into western Wisconsin.

The Twin Cities is in store for its snowiest February on record by the time the storm subsides. The area already has 22.6 inches of snow this month. Wednesday’s snowfall will likely break a record of 26.5 inches in February set back in 1962.

The heaviest accumulation is expected Wednesday morning when snowfall rates of an inch per hour were expected.