Forecasters have said parts of the U.S. can expect frigid temperatures in December. A first round has arrived, and more cold air could be coming.

Some National Weather Service staffers are working double shifts to keep forecasting offices open. Others are operating under a “buddy system,” in which adjacent offices help monitor severe weather in understaffed regions. Still others are jettisoning ...

Lawmakers expressed concerns over weather modification and geoengineering. A congressional subcommittee spent nearly two hours on Tuesday discussing the rarely practiced but frequently talked about science of weather modification and geoengineering.

Heavy rainfall, possible landslides, rising rivers and downed powerlines has prompted KGW to issue a Weather Impact Alert for Monday through Wednesday.

Is it snowing in Buffalo? The calendar has turned to December, which means Mother Nature is off the inactive list.

No rest for the winter weary after the first significant snow of the season fell in Massachusetts on Tuesday. The weather forecast shows an early-season Arctic blast is on the way to the Boston area. A cold front will pass through New England Thursday afternoon, ushering in the coldest air since last winter.

The blast of frigid temperatures follows days of snowy, icy conditions across much of the country. It's bringing the coldest air of the season so far to the Midwest and the Northeast. About 10 record lows are possible Thursday morning and 20 are likely Friday morning.

Such events distort the polar vortex, which causes Arctic air to descend into the U.S. and causes temperatures to plummet.