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A man walks on the ice-covered break-wall along Lake Michigan in Chicago. Photo: Scott Olson/Getty Images

Cities across the Midwest and Northeast U.S. set new record low temperatures Wednesday and Thursday morning as a once-in-a-generation cold snap swept through the U.S. The frigid conditions have been linked to at least nine deaths already.

The big picture: An air mass that originated in the High Arctic is sweeping through the U.S., but even though temperatures are expected to start easing this afternoon and be above freezing this weekend in parts of the Midwest, this is likely not the last time this kind of sudden cold snap could affect large portions of the nation. Recent studies show climate change could cause more southward jogs of the polar vortex in the future.

  • 84 million people experienced temperatures at or below 0°F, per meteorologist Ryan Maue. A total of 3.5 million people experienced at least minus 30 °F in the Midwest, per Maue.
  • Schools, universities, and businesses closed or limited their hours, flights have been grounded, and some states' mail delivery services are on hold until the cold passes.
  • Chicago train workers set fire to train tracks to keep trains running properly, and I-65 is reportedly a parking lot after vehicles broke down due to frozen fuel filters.
  • The observed wind chills Thursday morning were some of the coldest seen since the 1980s and 1990s across much of the affected area, per the National Weather Service, and can cause frostbite on exposed skin within seconds.
  • The headlines are worth a double take: "It's So Cold the Ground Looks Like Clouds on Satellite" (via The Weather Channel).

Record cold:

  • The coldest location in the U.S. on Thursday was Cotton, Minn., where the temperature reached minus 56°F. The coldest location in the U.S. on Wednesday was Norris Camp, Minn., where it was minus 48°F, with a wind chill of minus 65°F.
  • Rockford, Ill. hit minus 30°F Thursday morning, breaking its old all-time cold temperature record of minus 27°F, set in 1982.
  • Moline, Ill. hit a new all-time record of minus 33°F Wednesday evening, lower than the minus 28°F record previously set in 1996.
  • Cedar Rapids, Iowa broke its previous all-time record of minus 29°F when it dipped to minus 30°F Thursday morning.
  • Mather, Wis. hit a new all-time record on Wednesday of minus 43°F.
  • Chicago set a new daily record of minus 21°F on Wednesday, but failed to threaten its all-time coldest temperature of minus 27°F.
  • Illinois and Minnesota either reached or came close to setting all-time state records on Thursday. The Mount Carroll Cooperative station in Illinois reported a temperature of minus 38°F, which, if verified, would break the previous record of minus 36°F, set in 1999. Minnesota would have to go below minus 60°F to break its record (Cotton came within 4°F of that this morning).
  • New daily records were set in Detroit at minus 14°F, Pittsburgh at minus 5°F, South Bend, Ind. at minus 20°F, outside of Marquette, Mich. at minus 26°F, La Crosse, Wis. at minus 33°F, Grand Forks, N.D. at minus 32°F, International Falls, Minn. at minus 46°F, and Chicago at minus 21°F.

The state of play: Chicagoans reporter hearing loud noises and banging overnight, likely as a result of a "frost quake," or a cryoseism, per local WGN-TV, which occurs when a sudden drop in temperatures causes underground water to freeze and expand, causing the ground to crack.

  • As many as 13,500 customers had power outages in Wisconsin and Iowa by midday Wednesday, per the Washington Post.

Resources:

Go deeper

Updated 3 hours ago - World

In photos: Pope Francis spreads message of peace on first trip to Iraq

Pope Francis waving as he arrives near the ruins of the Syriac Catholic Church of the Immaculate Conception (al-Tahira-l-Kubra), in the old city of Iraq's northern Mosul on March 7. Photo: Vincenzo Pinto/AFP via Getty Images

Pope Francis was on Sunday visiting areas of northern Iraq once held by Islamic State militants.

Why it matters: This is the first-ever papal trip to Iraq. The purpose of Francis' four-day visit is largely intended to reassure the country's Christian minority, who were violently persecuted by ISIS, which controlled the region from 2014-2017.

Cuomo faces fresh misconduct allegations from former aides

New York Gov. Andrew Cuomo during a February press conference in New York City. Photo: Seth Wenig/Pool/AFP via Getty Images

The office of New York Gov. Andrew Cuomo (D) was on Saturday facing fresh accusations of misconduct against his staff, including further allegations of inappropriate behavior against two more women. His office denies the claims.

Driving the news: The Washington Post reported Cuomo allegedly embraced an aide when he led the U.S. Department of Housing and Urban Development and that two male staffers who worked for him in the governor's office accused him of routinely berating them "with explicit language."

In photos: Protesters rally for George Floyd ahead of Derek Chauvin's trial

Chaz Neal, a Redwing community activist, outside the Minnesota Governor's residence during a protest in support of George Floyd in St.Paul, Minnesota, on March 6. Photo: Kerem Yucel/AFP via Getty Images

Dozens of protesters were rallying outside the Minnesota governor's mansion in St Paul Saturday, urging justice for George Floyd ahead of former Minneapolis police officer Derek Chauvin's trial over the 46-year-old's death.

The big picture: Chauvin faces charges for second-degree murder and manslaughter over Floyd's death last May, which ignited massive nationwide and global protests against racism and for police reform. His trial is due to start this Monday, with jury selection procedures.