Earth Changes
Airport spokeswoman Laura Coale said on Thursday that all damaged planes had to be evaluated, slowing operations. She says an unknown number of planes have been taken out of service because of damage.
Frontier Airlines says it expects more cancellations on Friday.
The airport was pummelled by three-quarter-inch hail for about 15 minutes on Wednesday night.
Among those stranded at the airport was Wisconsin Governor Scott Walker. He tweeted that he slept on the floor of a conference room after airport staff got him a blanket and pillow.
The airport didn't distribute cots and blankets to all passengers because airlines didn't request help. About 200 people typically spend the night at the airport.

Grimsvoetn erupted in May, sending clouds over Iceland and causing flight delays
Hekla has erupted about every 10 years for the past 30 (in 1981, 1991 and 2000). Eyjafjallajökull's eruption in April 2010 created the worst peace-time disruption in air traffic ever, grounding as many as 100,000 flights and stranding millions (and losing airlines hundreds of millions of dollars). This May, Grimsvoetn erupted, shutting airports, and either delaying or cancelling several hundred flights.
There's of course no way to prepare for the eruption, and if you've got flights booked to, through or over Western Europe, you might take comfort from Icelandic geophysicist Pall Einarsson, who told Ice News last week, speaking of recent fears regarding Hekla, "I've been saying this for three or four years and 'soon' means different things to journalists and geologists."

Weld County Sheriff Deputy Chad Walser talks with Longmont Emergency Unit crews and a firefighter from Mountain View Fire Rescue about closing Weld County Road 20 1/2 at Weld County Road 1 as a sinkhole grows Wednesday evening.
A broken culvert has exposed a 15-foot by 15-foot cavern under the roadway and it is growing, officials on scene said as water gushed below. A Weld County Public Works crew left to pick up barricades in Johnstown and would return later this evening, Deputy Chad Walser said.
It was not known how long the road would be closed, but emergency crews on scene said they thought at least a week, as most of the area would have to be dug up.
Councils and coastguards sealed off the coast between West Bay and Eype after the landslide from the cliff to the waterline.
Now they are warning people to beware of the danger amid fears more earth may collapse.
West Dorset District Council technical services manager Steve Woollard said: "We have put up warning signs on both sides of the beach leading up to the landslide and also at the end of the Esplanade at West Bay.

A portion of the mudslide that's causing some trouble for Dillon's water supply in Straight Creek.
A landslide crashed into Straight Creek on U.S. Forest Service land last week, threatening Dillon and Dillon Valley's primary water supply.
But the town and the valley will be able to pull clean drinking water from the high Lasky Gulch for at least a few months while waiting for the sediment from the slide to clear.
"The immediate concern was the question: Was it a large enough slide to where it could deposit enough material to create a blockage on Straight Creek?" Dillon town manager Devin Granbery said. "There would be a potential for the build up of water behind a blockage and then a release. and there was a potential for damage to property and life safety issues there."
A release of water from a behind a landslide dam could also damage the Dillon and Dillon Valley diversion plants downstream, which pull water from the creek to be filtered for drinking water.

Parched: A dry river bed at Big Bend National Park along the banks of the Rio Grande in Texas, where it has not rained since September 2010
Bosque County was recognized as a primary natural disaster area, and Hill County farmers and ranchers are also eligible for assistance because of their proximity to the disaster area. With 213 counties declared primary disaster areas and the remaining 41 qualifying for assistance because they are contiguous, the entire state has been declared a disaster.
"Many producers have lost their crops due to the devastation caused by the drought and wildfires," said Agriculture Secretary Tom Vilsack. "President Obama and I want these farmers and ranchers to know that we will support them through the recovery process and help them once again become productive suppliers of food, fiber and fuel that keep America prospering. This designation will help provide that support."
The Utah Highway Patrol says heavy rainfall opened the hole more than 30 feet deep along State Highway 35 late Wednesday. It happened near Tabiona, a town about 80 miles east of Salt Lake City.
The highway patrol says 15-year-old Justine Barneck died after the SUV she was riding in crashed as it approached the hole a few minutes after the collapse. Her father, 59-year-old Michael Barneck, was injured in the accident.

A home sits on the other side of a large sinkhole that was created from a heavy rainstorm washing out a culvert under state Road 35 in Tabiona Wednesday night.
The road remained closed Thursday. An investigation is under way.

A healthy coral reef ecosystem with sharks off Jarvis Island, an uninhabited island located in the South Pacific Ocean. A loss of these large predators can alter the patterns of predation and herbivory, ultimately leading to an coral system where reef-building corals and coralline algae lose their competitive advantage.
These animals, called apex predators, play a crucial role in ecosystems, and their disappearance - often due to hunting by humans and loss of habitat - can lead to changes in vegetation, wildfire frequency, infectious diseases, invasive species, water quality and nutrient cycles, according to the authors led by James Estes, a professor of ecology and evolutionary biology at the University of California, Santa Cruz.
"The loss of apex consumers is arguably humankind's most pervasive influence on the natural world," the researchers conclude in a review published in the July 15 issue of the journal Science which examined findings from studies of ecosystems on land, in freshwater and in the ocean.
An expert from the Vanuatu Geohazards Observatory has been sent to monitor the volcano, which has been known to trigger earthquakes.
They have measured an increase in tremor activity in the area and are expecting more explosions.
If the volcano does becomes more active, people living around it will be forced to evacuate.
Volcanologist Sylvain Todman, from the Vanuatu Geohazards Observatory, told Pacific Beat they were watching the situation very closely.
"At the moment we have sporadic explosions but the explosions are getting bigger and bigger every time," he said.

The earthquake struck in the middle of the Channel and was felt by some residents in West Sussex.
An earthquake with a magnitude of 3.9 has struck in the middle of the Channel. Residents in parts of West Sussex reported buildings shaking for a few seconds at around 8am on Thursday.
The British Geological Survey said the quake had a depth of 10km and its epicentre was south of Portsmouth, Hampshire. Official measurements showed it happened at 7.59am BST.
Sussex police, the Solent coastguard and West Sussex fire and rescue service said they had not been called out to any incidents related to the quake.
David Kerridge, from the British Geological Survey, said the earthquake was the largest in the area since a magnitude 4.5 quake in 1734.









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