Sinkholes can form anywhere there is soluble rock present underground. This is known as "karst terrain," according to Randall Orndorff, Director at the Eastern Geology and Paleoclimate Science Center of the United States Geological Survey. Soluble rocks that could potentially lead to sinkhole formation include limestone, gypsum and salt.
More than 20 percent of the country is above "karst terrain," which can produce a sinkhole, according to the U.S. Geological Survey (USGS).
Sinkholes occur most often in Florida, Texas, Alabama, Missouri, Tennessee, Kentucky and Pennsylvania.
Earlier this year, a 20-foot sinkhole in Florida swallowed a house and its resident after developing while the man was sleeping.
On Aug. 11, 2013, a 60-foot-wide sinkhole formed under the Summer Bay Resort in Clermont, Fla., prompting the evacuation of its guests. Nobody was injured.
Content contributed by Molly Cochran.
Sunshine will slowly fade away early this week as clouds move in ahead of the next storm system.
Above-normal temperatures will again move into the Los Angeles area.
A chance of rain is expected on Monday as a Pacific storm moves through the Northwest United States.
Seasonable, dry weather will prevail across the Atlanta area through Friday.
Umbrellas and raincoats will be needed this week in the Seattle area.
Sunshine and dry conditions will be seen over the Dallas-Fort Worth area through the end of the week.
Edmonton, AB (1995)
Small snowstorm brought major traffic problems; dozens of vehicles slid into ditches during the first snowfall of the season.
Eastern New England (1770)
"An exceeding great NE storm" -- great damage MA to ME -- highest tide since 1723.
Pagwa, Ontario, Canada (1923)
Highest amount of snowfall in Ontario for a climatological day - 36.0".