Hottest in Pacific Northwest in recorded history

(CNN)The Pacific Northwest is baking in a record-breaking heat wave, with an all-time high of 108 degrees Fahrenheit reported Saturday in Portland, Oregon.

Along the West Coast, more than 20 million people are under a heat warning or advisory, from the Canadian border to the Mexican border.

Water-level lines, unveiled by years of drought, are seen on the rocks of the Elephant Butte Reservoir in Truth or Consequences, New Mexico, on July 9.

Cattle graze as the Tamarack Fire burns near the California-Nevada border on July 17.

These peaks of the Sierra Nevada mountain range, near Lone Pine, California, often have snow packs that last throughout the summer months. But there were none on July 18.

Cattle graze as the Tamarack Fire burns in Markleeville, California, on July 17.

Dead carp fish rot in the remaining water of a drying Little Washoe Lake in Nevada.

The Bootleg Fire illuminates smoke at night near Bly, Oregon.

A plane drops fire retardant on Harlow Ridge above the Lick Creek Fire, southwest of Asotin, Washington, on July 12. The fire started the week before and has burned more than 50,000 acres of land between Asotin County and Garfield County.

In this GeoColor image from July 12, smoke from numerous wildfires could be seen as gray-brown, in stark contrast to the white cloud cover over other parts of the continent.

Annette Garcia, director of the Coachella Valley Horse Rescue, straps ice packs onto a horse's legs to help keep him cool amid a water shortage in Indio, California.

Visitors take photos in front of a thermometer July 10 at Death Valley National Park in Death Valley, California. Death Valley is known to be a hot place, but on July 9 <a href="" target="_blank">it hit 130 degrees Fahrenheit</a> for only the fifth time in recorded history.

Golden Davis cools off in a mister along the Las Vegas Strip on July 9. The city tied its all-time temperature record of 117 degrees Fahrenheit over the weekend.

Smoke envelops trees as the Sugar Fire, part of the Beckwourth Complex Fire, burns in Doyle, California, on July 9.

Volunteers hand out water and ice at a homeless-services facility in Sacramento, California, on July 8.

A utility crew works on power lines in front of a hillside that was burned by the Salt Fire in California's Shasta County.

As the Salt Fire burns nearby, a section of the drought-stricken Shasta Lake sits mostly dry in Lakehead, California, on July 2. Firefighters were battling nearly a dozen wildfires in the region.

The exposed lake bed of the San Gabriel Reservoir is seen near Azusa, California, on June 29.

A sign is posted about watering limits in Azusa, California, on June 29.

This aerial photo shows the San Gabriel River and the exposed lake bed of the San Gabriel Reservoir near Azusa on June 29.

People in Portland, Oregon, cool off at the Oregon Convention Center on Sunday, June 27. Portland <a href="" target="_blank">set an all-time high of 112 degrees</a> that day. It surpassed it a day later with a high of 116.

Carlos Torres drinks water on Saturday as he looks for paperwork in his destroyed mobile home in Kelseyville, California. A wind-whipped brush fire burned three mobile homes, two separate garages and vehicles, a single-family dwelling and outbuildings.

Kayakers navigate the waters of Lake Powell in Page, Arizona, on June 24.

John Elizondo, 11, dumps a bucket of water over himself while playing in the Snake River at the edge of Asotin, Washington, on June 24.

Park visitors in Big Water, Utah, walk on an area of Lake Powell that used to be underwater at Lone Rock Beach.

James Oehlerking spreads ice over a tub of bottled beer at Coors Field, the home of Major League Baseball's Colorado Rockies, on June 17. Temperatures were in the triple digits for a third straight day in Denver.

A sign says "stop in and cool off" on a building at Lake Mead in Boulder City, Nevada, on June 16. The lake is at its lowest water level on record since the reservoir was filled in the 1930s.

Gerry Huddleston cools off in the shallow water of the Russian River in Healdsburg, California, on June 16.

A wildfire burns on a canyon wall south of St. Xavier, Montana, on June 15. Record-high temperatures and gusting winds stoked a rapid expansion of major fires across central and eastern Montana.

Ranchers Jim Jensen, center, and Bill Jensen inspect a trench they are working on to try to get more water to their ranch in Tomales, California, on June 8. As the drought continues in California, many ranchers and farmers are beginning to see their wells and ponds dry up. They are having to make modifications to their existing water resources or have water trucked in for their livestock.

Cattle walk up to a water trough in Tomales, California, on June 8.

Low water levels can be seen in the Hoover Dam reservoir of Lake Mead on June 9. <a href="" target="_blank">Water levels at Lake Powell and Lake Mead</a> -- the two largest reservoirs on the Colorado River -- have dropped at an alarming rate.

This aerial photo shows houseboats anchored at the Bidwell Canyon Marina in Oroville, California, on June 1. As water levels continued to fall at Lake Oroville, officials were flagging houseboats for removal so they could avoid being stuck or damaged.

California's Tule Lake National Wildlife Refuge, near the Oregon border, is seen on May 28. The area has been severely affected by drought and the lack of irrigation waters from Upper Klamath Lake, which usually feeds into the refuge.

This aerial photo shows rows of almond trees sitting on the ground during an orchard removal project in Snelling, California, on May 27. Because of a shortage of water in the Central Valley, some farmers are having to remove crops that require excessive watering.

A firefighter inspects equipment on a Type 3 engine designed for wild land firefighting at a station in Oroville, California, on May 26.

A launch ramp, extended to accommodate low water levels, stretches into California's Lake Oroville on May 22. At the time of this photo, the reservoir was at 39% of capacity and 46% of its historical average.

Firefighters battle a brushfire in Santa Barbara, California, on May 21.

Clinton Jackson prepares to fill water tanks with recycled water in Oakley, California, on May 20. The Ironhouse Sanitation District opened its residential recycled water fill station earlier than usual to make recycled water available for free to Oakley and Bethel Island residents.

Unprecedented and dangerous heat will continue to build across the Pacific Northwest for several days, where high temperatures will climb into the triple digits. Hundreds of daily high-temperature records are forecast to be broken Sunday through much of this week

Sarah O'Sell takes her new air conditioner to her apartment in Seattle on Friday.
Monthly June records and all-time records are also possible, especially today through Tuesday for some locations. Extreme heat over long periods will significantly increase the potential for heat-related illnesses.

Trying to cool off in Oregon

Portland International Airport recorded a record high of 108 degrees on Saturday, the National Weather Service said. The previous record was 107 — set on August 8 and 10, 1981, and July 30, 1965.
Visitors and residents gathered along the waterfront and at the Salmon Street Springs Fountain on Saturday, CNN affiliate KATU reported.
At one point a group of naked bicyclists rode through, reporter Dan McCarthy tweeted.
“Only in Portland,” he wrote.
“We’re serving people who are already suffering from chronic health conditions — so whatever we can do to help people stay safe when they have nowhere else to go,” Scott Kerman, executive director of the Blanchett House shelter in Portland told the station.
Nonprofit groups are trying to help the homeless in Portland and other Oregon cities with cooling centers.
CNN affiliate KOBI reported that the Medford Senior Center was offering food, water and cold drinks.

People gather at the Sandy River Delta in Oregon to cool off Friday.
Medford Senior Center volunteers said this type of shelter is vital to the community.
“Awesome, it’s great. God bless them, man,” Richard William Harris, who has navigated through heat and cold off and on for about 30 years, told the station. “I’m just glad they’re here cause I sure needed it and I don’t want to die out there from heatstroke. If it wasn’t for this place, I don’t know what I would do.”
The Oregon Health Authority lifted Covid-19 capacity limits at pools, movie theaters and malls to help people beat the heat.

Seattle already sets a Sunday record

At Seattle-Tacoma International Airport, the thermometer hit 102 on Saturday afternoon, just behind the record 103 set on July 29, 2009, the weather service said.

Cody Miller, with the Salem Fire Department, waits near a digital sign tracking the day's temperatures as parts of Oregon bake in a heat wave Saturday.
That record is in jeopardy both Sunday and Monday, as temperatures are expected to climb even higher.
While the peak of the heat is expected Sunday through Tuesday for most locations, temperatures are expected to remain well above average through much of this week and potentially into Fourth of July weekend.
Already Sunday morning, as temperatures were climbing at the Sea-Tac airport, the low of 73 degrees will break the record for maximum low temperature — which was 72 degrees on July 29, 2009, the weather service said.
The average high temperature for Seattle this time of year is 73.
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