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.
Sunny skies and mostly dry conditions are expected through the rest of the week across the Los Angeles region.
Another few days of rather cool, at times unsettled weather lie ahead for the United Kingdom this week.
The threat for severe thunderstorms in the North Central states will shrink to parts of the central Plains Tuesday night with locally heavy storms farther to the northeast.
Drenching downpours, locally gusty thunderstorms and squalls at sea will continue in and around Florida through much of the week.
A heat wave will build, then recede in the Northeast this week with the most humid air focused on the Interstate 95 corridor.
Flooding monsoon rain will continue this week in India and southeast Pakistan, but a drier pattern is expected to set in during August.
Marquette, Il (1988)
99 degrees for a date record.
Hurricane Bertha formed 450 miles east of Jacksonville, FL. Maximum sustained winds of 75 mph with gusts to 90 mph.
Western Pacific (1990)
Typhoon Steve east of Iwo Jimo. Peak winds of 125 mph sustained gusts to 155 mph.