Dangerously cold weather will put much of the United States into a deep freeze over the weekend as temperatures are expected to plunge by up to 40 degrees behind an Arctic air mass.

A potent shot of Arctic air starts settling in Monday as a massive dip in the jet stream pulls in frigid air across the entire eastern half of the country. Temperatures are set to drop as low as 20 degrees below average Tuesday and Wednesday with highs only reaching the teens, with lows in the single digits and even plunging below zero.

Don’t forget to disconnect your garden hose before a winter storm or deep freeze hits. If it’s possible, use an indoor valve to shut off and drain water from pipes leading to outside faucets. This reduces the chance that pipes inside your house will freeze.

An arctic blast will send temperatures across the United States plummeting as bitterly cold air that originated in Siberia will arrive from Canada by week’s end, bringing with it dangerously cold wind chills for millions of Americans.

Temperatures are expected to plummet over the weekend, bringing life-threatening conditions to large stretches of the United States. The polar vortex will send temperatures below freezing for much of the country starting this weekend and stretching into next week,