Elsewhere in the region, officials worried about avalanches on Mount Hood and floods on the eastern slopes of the Cascades in Eastern Washington and Idaho.

“When we have low temperatures like we have had, and then we have a spike, the cumulative effect may be people not hydrating properly,” said Jim Flaherty, Vancouver firefighter-spokesman. He advised that everyone should drink more water.

Temperatures had been forecast to peak in the mid-80s Saturday but instead climbed to 93, breaking the record of 88 set in 1963.

Vancouver also set a record for night-time lows for the day with a reading of 64, the highest overnight low in the region. That broke a previous Vancouver high for an overnight low temperature of 57 F set in 2006.

“We want to remind people to take it slow and easy and drink water, use sunblock and alternate between sun and shade. When you drink something other than water, then alternate with water. And don’t forget the pets,” Flaherty said.

He suggested that residents with elderly neighbors should look in on them and make sure they are also well-hydrated.

Cooler weather is expected today, with a high of 77 forecast.

Oregon avalanche

Elsewhere, record hot weather has boosted the avalanche danger in much of the Pacific Northwest, with slides closing at least one highway and injuring a teenager in Oregon.

An 18-year-old man from Eugene, Ore., was injured slightly Saturday in an avalanche on Mount Hood, east of Portland. Two other climbers, one from Eugene and the other from Turner, Ore.,  managed to avoid being hit by the slide around 11:30 a.m. near Hogsback Ridge.

The 18-year-old was buried up to his waist but after being freed was able to walk down the mountain without assistance, Clackamas County sheriff’s Detective Jim Strovink said.

State Highway 20, the North Cascades Highway, has been closed by a snowslide near Liberty Bell since Thursday and won’t reopen before sometime this week.

“Our avalanche team won’t go back in to reassess the conditions until Monday,” said Jeff Adamson, a Washington State Department of Transportation spokesman.

The Northwest Avalanche Center’s Web site recommended that backcountry visitors in the Cascade Range and Olympic Mountains avoid potential slide areas.

“Deep avalanches are possible. Some slides may release to or near the ground, involving the entire winter’s snowpack,” the agency warned. “The expected large wet snow avalanches may travel very fast and run long distances, possibly to lower elevations where little or no snow cover may remain, or to valley floors.”

Even at still lower elevations, hikers could encounter unexpected danger trying to cross streams and rivers swollen suddenly by rapid snowmelt, said Lauren Braden, a Washington Trails Association representative.

“Low- to mid-elevation hikes with river- and stream-crossing could present serious hazards in a case like this. Streams and rivers will be swollen with snowmelt and running high. Crossings should be taken with extreme care,” Braden said.

Flood risks to the east

Anxious communities watched as near-record high temperatures hastened snow melt that swelled rivers across the Inland Northwest over the weekend.

The National Weather Service issued flood watches or warnings for rivers and streams from the east slopes of the Cascades to the Bitterroot Range of northern Idaho. High temperatures in the upper 80s and lower 90s were rapidly shrinking an above-average snowpack in the mountains.

In Washington state, flood watches and warnings were issued for numerous rivers that flow from the east slopes of the Cascades. Flood watches were out on the Spokane, Naches, Wenatchee, Chelan, Okanogan and Stehekin rivers.

Jail work crews, church groups and other volunteers filled sandbags in case the Middle Fork of the Clearwater River in north-central Idaho spilled its banks.

Idaho Gov. C.L. “Butch” Otter declared state disaster emergencies for Clearwater and Idaho counties in anticipation of flood damage, paving the way for additional state support to the counties if needed.

In northern Idaho, Kootenai County commissioners declared a state of emergency Friday and established no-wake zones for boats on Lake Coeur d’Alene, the Coeur d’Alene River and the Spokane River.

The Associated Press contributed to this story.