DENVER -- The Latest on the wintry weather in the U.S. (all times local):
Stormy weather and a power outage have affected two Northern California airports as a storm hits the region.
KPIX-TV says the Federal Aviation Administration imposed a ground delay at San Francisco International Airport Tuesday because of the weather, cutting the number of arrivals in half.
The airport reported several hundred delayed flights and about two dozen cancellations.
Oakland International Airport lost power for about 90 minutes Tuesday evening, shutting down its security checks and causing some flight delays and a couple of diversions.
It’s unclear what caused the outage but it came as thousands of people in Oakland and further south lost power during the storm.
A highway over the Sierra Nevada has been reopened after a 40-mile (64-kilometer) stretch was closed by a snowstorm.
Interstate 80 north of Lake Tahoe was closed Tuesday afternoon so crews could clear the roadway following numerous spinouts and collisions.
The highway reopened in both directions Tuesday evening but chains are required for most vehicles to the Nevada state line.
Snow also closed several other mountain roadways in Northern California because of crashes, spinouts and snowbound cars.
The Lake Tahoe area is under a winter storm warning through Thanksgiving with forecasts of possible blizzard conditions beginning Tuesday night.
Some lanes on a highway over the Sierra Nevada is moving again, but a 40-mile (64-kilometers) stretch is still closed north of Lake Tahoe because of a powerful snowstorm.
The California Highway Patrol says eastbound traffic on Interstate 80 was released Tuesday afternoon after crews cleared the roadway following numerous spinouts and collisions.
Westbound traffic is still being held at Truckee, California, about 20 miles (32 kilometers) west of the California-Nevada line. Authorities don’t have an estimate of when those lanes will reopen.
The Lake Tahoe area is under a winter storm warning through Thanksgiving.
The National Weather Service says winds gusting up to 85 mph (136 kph) could create blizzard conditions Tuesday night into Wednesday morning with up to 2 feet (61 centimeters) of snow possible at elevations above 7,000 feet (2,130 meters).
A snowstorm in the Sierra Nevada has shut down a highway in the mountains west of the Nevada-California line.
The California Highway Patrol said traffic on U.S. Interstate 80 was being held Tuesday on both sides of Donner Pass north of Lake Tahoe so crews could clear the highway of multiple spinouts and collisions.
There was no immediate report of any serious injuries. Authorities didn’t have an estimated time for reopening the interstate.
The Tahoe area is under a winter storm warning through Thursday afternoon.
The National Weather Service says winds gusting up to 85 mph could create blizzard conditions Tuesday night into Wednesday morning with up to 2 feet (1 meter) of snow possible at elevations above 7,000 feet (2,130 meters).
Authorities are reporting downed trees, power outages and heavy snow on mountain passes as a “bomb cyclone” approaches the Northern California and southern Oregon coast.
The storm will make landfall in Oregon on Tuesday afternoon, then shift south toward California.
Trees are down across U.S. Highway 101 just north of the California border in Oregon. Sporadic power outages are being reported across the region. Some coastal hotels say they’re prepared for big storms.
Winds are gusting at 70 mph (113 kph) in coastal areas, and waves of up to 32 feet (10 meters) are expected. A bomb cyclone is a rapid drop in air pressure.
The National Weather Service is urging people to wait to travel for Thanksgiving until the weather improves.
It comes as a snowstorm snarled travel in Colorado and Wyoming and is expected to move into the Midwest.
One person has been killed, and two others have been injured in a multi-vehicle crash during a powerful snowstorm that moved through Colorado.
Colorado State Patrol Trooper Gary Cutler says a tractor-trailer jackknifed and was hit by two other semitrucks and a pickup on Interstate 70 near Vail early Tuesday. One of the truck’s fuel tanks burst.
The Vail Daily reports a hazardous-materials team was called in to clean up the leaking fuel.
Authorities say roads in the area were warm when the snow started falling, creating icy conditions as the storm strengthened.
The storm moved east out of the mountains and dropped about 10 inches (25 centimeters) of snow at Denver’s airport, leading to hundreds of flight cancellations.
It’s expected to move into the Midwest states overnight.
Operations are getting back to normal at Denver’s airport as a snowstorm moves out of Colorado but it could take days for airlines to accommodate travelers whose flights were canceled.
Officials say the storm dropped about 10 inches (25 centimeters) of snow at the airport. That led to the cancellation of about 30 percent of the airport’s average 1,600 daily flights, mostly for Southwest Airlines and United Airlines.
Southwest spokesman Brad Hawkins said Tuesday it will take “a couple of days” to accommodate stranded passengers on other flights because there are few available empty seats available during the heavy Thanksgiving travel period. That makes it harder for airlines to rebook passengers whose flights have been canceled.
The storm is expected to dump snow on the airport in Minneapolis but most snow is expected to fall overnight when few flights are scheduled.
Northern California and southern Oregon residents are bracing for a “bomb cyclone” weather phenomenon that’s expected at one of the busiest travel times of the year.
The National Weather Service says the storm expected Tuesday into Wednesday could be like nothing experienced in the area for 20 years.
Wind gusts of 75 mph (120 kph) are expected in some areas and waves of 35 feet (10.6 meters) or more could slam the coast.
Mountain passes in northern California and southern Oregon could get up to two feet (0.6 meters) of snow.
The center of the low-pressure system is expected to make landfall late Tuesday afternoon between Crescent City, California, and Brookings, Oregon.
A “bomb cyclone” forms when air pressure drops by 24 millibars in a 24-hour period.
Forecasters say this storm’s air pressure has dropped even more quickly than that.
Among those spending the night at Denver’s airport as a big snowstorm hit Colorado was Air Force Academy cadet Sadie Luhman, who was trying to get to Chicago for Thanksgiving.
Luhman told KCNC-TV that she left the academy near Colorado Springs late Monday to drive to the airport in the hope of beating the storm but ended up traveling right in the middle of it.
The trip took about three hours. That’s more than twice the normal driving time and she arrived at 1 a.m. Tuesday, 10 hours before her scheduled flight.
The airport has received 9.5 inches (24 centimeters) of snow from the storm so far. About 30 percent of its average daily 1,600 flights were cancelled.
An approaching storm forecast to dump heavy snow in the region has accelerated the seasonal closing of the highway to the North Rim of the Grand Canyon by a few days.
The Arizona Department of Transportation on Tuesday announced the closure of State Route 67, a 43-mile (69-kilometer) paved route between U.S. 89A at Jacob Lake and the North Rim.
The National Weather Service forecasts 27-35 inches (69-89 centimeters) of snow will fall on the North Rim from Wednesday night through Saturday morning.
SR 67 normally closes Dec. 1 but it can close earlier when weather conditions warrant.
It reopens in the spring, usually around mid-May.
About 1,100 travelers stranded by heavy snow and high winds spent the night camped out at Denver’s airport.
Hundreds of flights were canceled because of the storm that was still dumping snow on the city Tuesday.
Airport spokeswoman Alex Renteria says the workers handed out blankets, diapers, formula and toothbrushes and toothpaste to people who missed flights, including Air Force Academy cadets trying to get home for Thanksgiving.
About 30 percent of the airport’s daily average of 1,600 flights have been cancelled.
Crews were working to keep the airports’ runways cleared and airport officials were hopeful operations could return to normal Tuesday afternoon.
Forecasters are warning of “difficult to impossible travel conditions” across much of northern Arizona later this week as a storm dumps about 2 feet (0.6 meters) of snow along an area including Interstate 40.
Elsewhere in Arizona’s high country, approximately 1 foot (0.3 meter) of snow is expected.
The National Weather Service’ office in Flagstaff says travel conditions will start to deteriorate Wednesday night, followed by the heaviest snowfall Thursday through Friday morning.
The weather service said snow showers will become scattered late Friday but that traffic conditions will remain dangerous until Saturday.
A storm that has dumped heavy snow in Colorado and Wyoming has forced airlines to cancel hundreds of flights during the busy Thanksgiving week travel period and has made driving impossible in some areas.
Some government offices in the Denver area and in Cheyenne, Wyoming are closed Tuesday and about 7 inches (18 centimeters) of snow had fallen at Denver International Airport by Tuesday morning.
More snow was expected, forcing the cancellation of about a third of the airport’s average 1,600 daily flights.
More than 2 feet (60 centimeters) of snow has fallen in northern Colorado and about a foot (30 centimeters) fell in southern parts of Wyoming.
Heavy snow and gusty winds forced the closures of long stretches of Interstates 70 and 76 in Colorado and Interstate 80 in Wyoming.
Officials say parts of Interstate 80 were buried under snow drifts of up to 4 feet (1.2) meters.
— This version corrects that Denver’s airport averages 1,600 flights daily, not 1,500.
Thanksgiving travel is an ordeal under the best of circumstances, and a one-two punch of bad weather threatens to make it even more exhausting.
Airlines prepared to deal Tuesday with a forecast for heavy snow in Denver, canceling flights ahead of time and offering customers a chance to reschedule without racking up standard ticket-change fees.
As that front moves through the Great Lakes and the Northeast later in the week, forecasters say another storm will crash into the West Coast, possibly fouling flights and making driving treacherous.
The AAA auto club says more than 55 million people will travel at least 50 miles (81 kilometers) from home over Thanksgiving, and the Transportation Safety Administration is predicting record numbers at airports.