There is a huge mass of arctic air that is tightening its grip on the northern U.S. — and it won’t let go until next week. CBS New York chief weathercaster Lonnie Quinn has the chilly forecast. Source

Former President Trump’s historic second impeachment trial is set to begin Tuesday. The Senate is willing to work on Valentine’s Day and a federal holiday to speed things along. Kris Van Cleave has the details. Source

Here’s a look at the top stories making headlines on the “CBS Evening News with Norah O’Donnell.” Source

A new, more contagious variant of the virus may soon become the dominant strain. Source

The hacker allegedly tried to change the sodium hydroxide in the water supply from about 100 parts per million to 11,100 parts per million. Source

The Senate will begin the second impeachment trial for former President Donald Trump on Tuesday. CBS News senior White House and political correspondent Ed O’Keefe, CBS News congressional correspondent Nikole Killion, and Politico congressional reporter Olivia Beavers spoke to CBSN’s “Red & Blue” host Elaine Quijano about how both sides plan to present their cases when the outcome seems to be set in political stone. Source

The former president’s attorneys filed the impeachment trial memorandum ahead of start of the Senate’s proceedings Tuesday. Source

Details are coming into focus in President Biden’s $1.9 trillion COVID relief bill — including an increased tax credit for families with young children. Weijia Jiang reports. Source

The second impeachment trial of former President Trump is set to begin Tuesday as the future direction of the party remains unclear. CBS News chief Washington correspondent Major Garrett, CBS News political analyst Leslie Sanchez, and USA Today Washington bureau chief Susan Page spoke to “Red and Blue” host Elaine Quijano about where the GOP goes next. Source

The hacker allegedly tried to change the sodium hydroxide in the water supply from about 100 parts per million to 11,100 parts per million. Source