For more than three days, people in Clintonville, Wis., have woken up from sleep to a noise that some described as sounding like an explosion or distant fireworks.
What is it? No one knows. Geologists have ruled out earthquakes or explosions in old mines. City officials checked gas and sewer lines. The local military says they're not running any drills.
"In summary, it's crazy," Brian Niznansky, a meteorologist for Wisconsin's NBC26 station, said. "The craziest part is that no one has an idea, from the local officials to scientists, whether it's natural, manmade, a hoax, no one has any sort of idea what is going on. You can't rule out weather because we're in [a] historic heat wave."
Warm weather could potentially be to blame.
Lisa Kuss, spokesperson for the city, said the same, at a town meeting called on Tuesday to talk to residents about the disturbing sounds.
"It is a strong possibility that some natural phenomenon is occurring under the ground. We have discussed that both our strange winter weather and current very warm spring like weather, which is early, is extreme at best and somehow could be impacting our soils below the surface," Kuss said.
One theory about the noise is that the sound comes from the ground settling after ice in the ground quickly melted.
"If we've had a cold winter, and you get a good frost layer, 4 or 5 feet, then you get a huge warm up, you might get some cracking of the ground but our winter was very mild," Niznansky said.
"Cryogenic" noises, sounds related to freezing of the ground, are unlikely. Wisconsin had a warm winter. There were not many days with temperatures below freezing so that a thick frost layer could form. Temperatures were around 7 degrees above normal in January, almost 8 degrees above normal in February and 17 degrees above normal so far in March. The winter season's average temperature was 6F above normal.
"Over the last four days, Wisconsin had a dramatic increase in temperatures, from 20 degrees above normal to 35 degrees above normal," Margusity said. "Since Friday, the temperature has really increased rapidly. At the beginning of March, the temperatures were in the 30s. Wednesday was 81 degrees."
Margusity compared the ground warping to a bridge expanding and contracting in the cold.
"Between the wind, sunshine and humidity, you're warming the ground very rapidly, like a pan on the stove that warps because it gets hot so fast," AccuWeather meteorologist Henry Margusity said.
A major Thanksgiving Day storm threatens to ruin holiday events across the Central states with flooding rain, snow, a glaze of ice and fog.
Sandra remains on track to target northern Mexico Friday and Saturday, but it should be much weaker at landfall than its current major hurricane status.
Unsettled weather will stretch across the United Kingdom on 27th November as millions set out in search of the best Black Friday deals on offer.
Winterlike conditions will continue disrupt travel across the Intermountain West leading up to Thanksgiving.
Compared to Thanksgiving Day in 2014, this Thanksgiving will be substantially warmer in the Northeast.
Wet weather will stretch from Texas to Michigan and could impact shoppers and slow travel during Black Friday.
A dozen tornadoes across these states.
Astoria, Or (1998)
5.56 inches of rain fell, setting a new all-time record. the previous rainfall record was 4.53 inches from January 9, 1966.
Great Appalachian Storm (24th-26th) developed greatest wind force, deepest snow, most severe early-season cold in history of the Northeast: 18.8 inches of snow at Akron, OH; Youngstown, OH, had a maximum 24-hour snowfall of 20.7 inches and a maximum single storm total of 28.7 inches; Steubenville, OH, had a maximum single storm total of 36.3 inches; Pittsburgh, PA, had a maximum 24-hour snowfall of 20.1 inches and a maximum single storm total of 27.7 inches; and Charleston, WV had a maximum 24-hour snowfall of 15.1 inches and a maximum single storm total of 25.6 inches. At coastal stations such as Newark and Boston single-minute wind speeds in excess of 80 mph were registered. There was a 108 mph gust at Newark. Peak gusts of 110 were noticed at Concord, NH; 108 mph at Newark, NJ; and 100 mph at Hartford, CT. Atop Mt. Washington, a wind gust of 160 mph hit from the southeast early on the 26th. Central Park, in the heart of sheltered Manhattan Island, set an 80-year record of 70 mph.