A severe winter storm has prompted US airlines to cancel flights, issue travel waivers, and advise passengers on refund and rebooking options.

On Sunday at 11:57 p.m. the National Weather Service issued an updated winter storm warning in effect until Monday at noon for Mercer, Venango, Lawrence, Butler, Beaver, Allegheny, Washington and Greene counties.

A massive winter storm dumped sleet, freezing rain and snow across much of the U.S. on Sunday, bringing subzero temperatures and halting air and road traffic.  The ice and snowfall were expected to continue into Monday followed by very low temperatures which could cause “dangerous travel and infrastructure impacts” for days,

Snow, sleet and ice covered Memphis and much of Tennessee this weekend as a impactful winter storm entered the area.

The National Weather Service in State College has issued Winter Storm Warnings for all of central Pennsylvania through 1 p.m. Monday. It covers the following counties: Somerset, B

A monstrous winter storm is hitting the tri-state area on Sunday — expected to dump more than a foot of snow in some areas. Travel is becoming a nightmare. A weather event like this makes for perilous driving and travel conditions across the region.

Forecasters expected most of the snow accumulation to occur the night of Jan. 24 into Jan. 25, but more precipitation is expected throughout the day.

The National Weather Service issued a weather alert at 7:07 p.m. EST on Sunday for heavy snow until 9:15 p.m. EST for Presque Isle County.