Paul Martin emailed pix@irishweatheronline.com with these images of Noctilucent clouds over Omagh, Co Tyrone at 3.10am on Sunday, 03 July 2011.

Heavy rains have caused flooding in the Danish capital Copenhagen, damaging homes and sparking travel chaos in parts of the city.

It is a weekend of extreme weather across the country. Much of the nation is hot. There have been heat advisories in the Midwest and Southwest. There's a heat warning in Phoenix tonight after another day of triple-digit temperatures.

But as you travel north you'll find something you don't expect this time of year: lots of snow.

CBS News correspondent Tony Guida reports that some say the world will end in fire, some say in ice. Robert Frost's words clearly were not on the minds of holiday skiers at Crystal Mountain, Washington.

"I'm so excited. It's great. Get a tan. All this snow is awesome," says Lukas Holland, a snowboarder.

Actually, it's 50 feet of awesome. This has been the mountain's best season in 12 years. All across the West this weekend, skiers are flocking to mountains flush with snow: 40 feet at Arapahoe Basin, west of Denver; 70 feet at Squaw Valley, Idaho.

But record snowfalls mean dangerously swollen rivers. Nowhere has that been more evident than Minot, N.D., where heavy rains compounded the massive snowmelt. Thousands are still homeless, while many returning this weekend found conditions unlivable: flooding forced sewage into their homes.

Jakarta - A volcano in central Indonesia has erupted in clouds of smoke and searing gas that shot up nearly 20,000 feet (six kilometres) into the air.

State volcanologist Surono, who uses only one name, says no one was injured when Mount Soputan, located on Sulawesi island, exploded early Sunday.

The nearest villages are well outside the danger zone and there are no immediate evacuation plans.

Indonesia, the world's largest archipelago, is located on the so-called Pacific "Ring of Fire," an arc of volcanos and fault lines encircling the Pacific Basin.

Soputan lies around 1,350 miles (2,160 kilometres) northeast of capital Jakarta. It last erupted in 2008, causing no casualties.

Phoenix - About 4,000 homes in the metropolitan Phoenix area are without power - and air-conditioning - on a record-shattering day of heat in one of the nation's hottest cities.

Phoenix hit a high temperature of 118 degrees on Saturday, topping a 10-year-old record of 116 degrees for the date.

The National Weather Service say clouds from monsoon activity likely kept the area from reaching 120 degrees, but they say it's still the city's hottest day so far this year.

Laurel, Montana - Hundreds of barrels of crude oil spilled into Montana's Yellowstone River after an ExxonMobil pipeline beneath the riverbed ruptured, sending a plume 25 miles downstream and forcing temporary evacuations, officials said.

The break near Billings in south-central Montana fouled the riverbank and forced municipalities and irrigation districts Saturday to close intakes.

The river has no dams on its way to its confluence with the Missouri River just across the Montana border in North Dakota. It was unclear how far the plume might travel.

Cleanup crews deployed booms and absorbent material as the plume moved downstream at an estimated 5 to 7 mph.

"The parties responsible will restore the Yellowstone River," Mont. Gov. Brian Schweitzer said.

An investigation into the source of a mysterious bubbling on Lake Quassapaug only turned up a few beer cans.

Police were told last week that something was causing bubbling in the north end of the lake near a cove, a few days after a boat had been seen speeding away from the area.

Landowners living along the Rush River say its running faster and 18 feet deeper. Typically it runs only a couple of feet deep. Farmers in the area also say much of their soybean crop has been ruined by the water. And never have they dealt with this much flooding this late in the year.

Lowell Siebells - Lives on Rush River: "And you know all the water sitting in the fields, vector control will be able to control the mosquitoes just think what the mosquito population is going to be in a week, ya know."

The Rush River is expected to go down later this week.

Officials have issued extreme heat warnings for the July 4 weekend as forecaster predict that temperatures could soar to 112 degrees in some parts of L.A. County.

The heat wave is being caused by a high-pressure system and will bring a variety of weather conditions, according to the National Weather Service. Beach areas will see cloudy mornings giving way to highs in the 70s and 80s.

Other parts of the L.A. basin and Hollywood Hills will see highs in the 90s. The San Fernando and San Gabriel valleys are likely to see triple-digit temperatures.

The hottest temperatures will be in the Antelope Valley and parts of the Inland Empire, where temperatures could exceed 112 degrees. On Friday, according to the NWS, Palmdale and Woodland Hills each hit 101.

Officials urged people to take caution because of the heat.

An ExxonMobil pipeline that runs under the Yellowstone River in Montana ruptured Saturday and leaked hundreds of barrels of oil into the waterway, causing a 25-mile plume that fouled the riverbank and forced municipalities and irrigation districts downstream to close intakes.

The break near Billings in south-central Montana led to temporary evacuations of hundreds of residents along a 20-mile stretch. Cleanup crews deployed booms and absorbent material as the plume moved downstream at an estimated 5 to 7 mph.

The river has no dams on its way to its confluence with the Missouri River just across the Montana border in North Dakota. It was unclear how far the plume might travel.

"The parties responsible will restore the Yellowstone River," Mont. Gov. Brian Schweitzer said.

ExxonMobil spokeswoman Pam Malek said the pipe leaked an estimated 750 to 1,000 barrels of oil for about a half-hour before it was shut down. Other Exxon officials had estimated up to 42,000 gallons of crude oil escaped.

Duane Winslow, Yellowstone County director of disaster and emergency services, said the plume was dissipating as it moved downstream. "We're just kind of waiting for it to move on down while Exxon is trying to figure out how to corral this monster," Winslow said.

"The timing couldn't be worse," said Steve Knecht, chief of operations for Montana Disaster and Emergency Services, who added that the plume was measured at 25 miles near Pompeys Pillar National Monument. "With the Yellowstone running at flood stage and all the debris, it makes it dang tough to get out there to do anything."