Winter brings a variety of outdoor activities including ice skating and ice fishing.
A recent warm-up with temperatures as high as the 70s in the Northeast U.S. may have weakened some of the ice that had previously built up on ponds and lakes.
An AccuWeather.com meteorologist said, the conditions probably will improve as arctic air returns to the region.
"The warmth would have made it slushy," Senior Meteorologist Brian Wimer said. "There would have been some melting. It depends how much ice there was."
The arctic air will be firmly in place into the weekend.
"A lot of places have gotten colder. It would firm up the ice again, I would suspect by Friday and Saturday," Wimer said.
Any ice less than 2 inches thick on lakes and ponds is unsafe, and ice may not be the same thickness all over, officials said.
Two Oklahoma children died earlier this month after falling through ice, media reports said.
Four inches of ice can safely support 200 pounds or one person with gear, while 7 inches can safely support a group of people, or 1,500 pounds, according to the Pennsylvania Fish and Boat Commission.
One car can be supported on 8 inches of ice.
But there have been problems with vehicles falling through ice in Minnesota. The state's Department of Natural Resources issued a warning last week, saying that the ice was not strong enough for vehicles.
Last winter, six people died in Minnesota from breaking through the ice. All the deaths involved either a snowmobile or a vehicle, the department said.
At least 7 inches of ice are needed on a lake or pond to support a group of people, or 1,500 pounds, for ice skating or fishing, officials said.
A planned launching of a rocket by SpaceX was halted early Saturday morning due to unfavorable weather conditions.
Fung-wong will spread heavy rainfall across South Korea and Japan next week.
The fall season will start of seasonable for Minneapolis as high pressure yields several pleasant days through midweek.
Locally heavy and gusty thunderstorms will erupt over the Upper Midwest and Great Lakes Saturday.
A surge of warmth will quickly be erased as thunderstorms and a cold front sweep through the Northeast on Sunday.
The body of a missing Austin, Texas sheriff's deputy was found in a lake Friday afternoon, The Associated Press reports.
Rangely, CO ()
Large hail (some 4" in diameter) caused $ million in damages to cars, trucks, and buildings.
Centre County, PA (1792)
Quote from the diary of William Colbert, a Methodist Circuit Rider up in Centre County: "A very cold morning. It was surprising to see so much snow on the ground at this season of the year. The limbs of the peach trees broke, and large limbs of the oaks broke down, and saplings bent across the road. It began to snow last night before we went to bed. I came out of my way by Lamb's to Phillip Antes."
A total of 9 inches of rain in 6 hours causes flooding on Sugar Creek.