On a day when dangerously cold weather forced the Internal Revenue Service to close its downtown processing center, hundreds of probationary employees are on notice that their jobs are likely going away.

While tax season ramps up, the Trump administration’s wave of federal employee layoffs is expected to hit the IRS offices in Kansas City this week, according to one union leader. Workers with less tenure at the already-understaffed location are likely to be most affected.

Layoffs could begin for IRS employees in Kansas City on Wednesday. Shannon Ellis, president of NTEU Chapter 66, announced in a Facebook video that probationary employees would be terminated without specifics on timing or scope.