Extreme weather in Alaska that has brought record high temperatures and torrential downpours has left authorities in the far northern US state warning of "Icemageddon".

Huge sheets of ice are blocking roads and choking traffic in Fairbanks, Alaska's second largest city, reported the state's transportation department, which has coined the neologism -- a play on "Armageddon" -- to describe the chilly impasse.

"We're experiencing an unprecedented series of winter storms," the department tweeted.

Scientists say the unchecked burning of fossil fuels and other human activity is changing the climate, making it more unpredictable and prone to wild swings.

Rick Thoman, a weather specialist at the University of Alaska, Fairbanks, called the conditions of the past few days "very unusual".

Hours after thermometers on Kodiak Island in the south reached 19.4 degrees Celsius (67 Fahrenheit) -- the warmest December temperature ever recorded in Alaska -- the interior of the state saw 25 millimeters (an inch) of rain fall in just a few hours, a downpour unseen in decades.

Then when temperatures plummeted again, it all froze.

The rainstorm was caused by the same weather system that brought the soaring temperatures, transporting warm, moist air from Hawaii to the frigid far north.

"This kind of thing -- record high moisture content, record warm air -- is exactly what we expect, of course, in our warming climate.

Unsettled weather was continuing to play havoc with flights in an out of Sea-Tac International Airport in Seattle, with hundreds of flights canceled or delayed this week.

In California, snow and persistent rain also continue to cause problems, with localized flooding forcing evacuations in areas around Los Angeles.

In the north of the state, the tourist magnet of Lake Tahoe -- where forest fires a few months ago caused residents to flee -- has been buried in heavy snow, leaving some people cut off.

More than five meters of snow have now fallen on parts of the Sierra Nevada mountain range this month, an all-time record, according to the Central Sierra Nevada Snow Laboratory at University of California at Berkeley.

UK records warmest ever New Year's Eve
London (AFP) Dec 31, 2021 - The UK on Friday experienced its warmest New Year's Eve on record with temperatures hovering around 15 degrees Celsius (59 degrees Fahrenheit), the Met Office said.

The village of Ryehill in Yorkshire in northern England recorded a temperature of 14.9C at 11 am on Friday, breaking a previous record of 14.8C set in Wales in 2011, Met Office spokesperson Stephen Dixon said.

The Met Office later tweeted that the village of Coningsby in Lincolnshire in the East Midlands had recorded 15.3C "meaning today is the warmest New Year's Eve on record for the UK".

Temperatures of 15C were forecast for several cities including London and Cardiff on Friday. "we are ending 2021 on a very mild note across the UK," the Met Office said.

Despite the warm conditions, the UK celebrates New Year's Eve in muted fashion without the usual grandiose fireworks displays in London and Edinburgh, and with nightclubs closed and limits on social gatherings in Northern Ireland, Scotland and Wales.

This year "as a whole has been slightly warmer and slightly drier than average," Mike Kendon of the National Climate Information Centre, said in a summary published by the Met Office.

The outgoing year is "likely to fall inside the top 20 warmest years on record for the UK -- a series which begins in 1884," the Met Office said, as "our climate is warming".

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High temperatures hit Greenland
Copenhagen (AFP) Dec 22, 2021
Temperatures have soared in Greenland recently, the Danish Meteorological Institute said on Wednesday, in line with warming trends experts have linked to global warming. In the capital Nuuk, the mercury hit 13 Celsius (55 Fahrenheit) on December 20, compared to the -5.3C that is average for this time of year. In Qaanaaq in the north, temperatures reached 8.3C, when the seasonal average is usually -20.1C, DMI said. DMI did not say whether the temperatures recorded had broken records set on ... read more