A brutal arctic blast is causing record-low temperatures and dangerous weather conditions across the U.S.

More than 140 million people are under wind chill advisories or warnings.

The severe weather has resulted in school closures, disrupted travel, power outages, and multiple deaths.

Major cities including Portland, Chicago, Denver, Dallas, and Fort Worth have canceled classes.

Over 1,200 flights have been canceled nationwide due to the weather.

Another surge of cold air is expected later in the week, potentially bringing record low temperatures to the Deep South.

Travelers are advised to check with their airlines for specific policies and consider travel insurance or credit card reimbursement for disrupted plans.