MEMPHIS, Tenn. (NEWSnet/AP) — Memphis residents were urged to boil water and New Yorkers were warned that roads could be covered with black ice this weekend, as brutal cold and inclement weather continue to sweep across parts of the U.S.

Bitterly frigid air spilled into the Midwest from Canada on Friday and several states were under advisories as forecasters warned that wind chills dipping to minus 30 degrees Fahrenheit could be common through Sunday morning.

On Friday, heavier-than-forecast snow fell in New York City, Baltimore and Washington, D.C. Michigan City, Indiana, received 17 inches of lake-effect snow on Friday.

Storms have walloped the Pacific Northwest, Midwest, Plains, South and Northeast with low temperature, heavy snow, ice storms, freezing rain and high wind for much of the past two weeks.

With a wind chill, temperatures are expected to drop as low as 15 degrees below zero in portions of Arkansas, Kansas, Kentucky, Mississippi and Missouri, National Weather Service predicted.

Days of cold broke so many water mains in Memphis, Tennessee, that water pressure fell throughout the city. On Friday, Memphis Light, Gas & Water urged all of its more than 400,000 customers to boil water for drinking or teeth-brushing or use bottled supplies. Water systems in about 10 counties had issued boil-water advisories.

The weekend outlook follows a series of storms blamed for at least 55 deaths in the U.S., many involving hypothermia or crashes.

National Weather Service said there could be a thaw next week, with a forecast of above-average temperature throughout most of the U.S.

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