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Heat wave threatens Portland, Seattle
01:03 - Source: CNN

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Portland, Oregon, hits record high of 103 for date on Wednesday

Some 15 million are under heat advisories in Pacific Northwest

CNN  — 

Residents of Portland, Oregon, just want their daily routine – and temperatures – to return to normal.

The normally temperate city could reach or break its all-time high of 107 degrees (1965 and 1981) by Thursday, the National Weather Service says.

The mercury reached 103 degrees on Wednesday, breaking a 31-year-old record for the day. The city’s old record was 96 degrees, which it marked on August 2, 1986.

Some 9 million people in the Pacific Northwest remain under heat warnings and advisories.

The heat is putting a big crimp on life in Portland. Jeff Hough, manager of Front Cooperative Grocery manager, told CNN affiliate KPTV the store coolers are shutting down and it’s difficult to even keep the doors closed.

“The front door, the rubber expanded, so it’s not shutting. It got so hot the door won’t shut,” he said.

Commuting was expected to improve in Portland. The metro area’s public transit system, TriMet, had service problems because of the heat and computer glitches caused by a system upgrade that went awry, CNN affiliate KATU reported.

TriMet offered free rides Thursday, and MAX light rail trains were slowed because of excessive heat. While slow speeds will continue, fares will be collected Friday.

Uber and Lyft offered discounted rides to city cooling centers, KATU reported.

Late Wednesday, Oregon Gov. Kate Brown declared a state of emergency, saying the “hot, dry and windy” conditions are increasing the threat of wildfires. The state also issued an air pollution advisory because of smoke from wildfires. Medford, in the south of Oregon, was the hottest spot in the state Wednesday with 112 degrees.

Portland wasn’t alone: Seattle also broke a daily record. The city reached 90 degrees Wednesday, breaking 89 degrees from August 2, 2009.

CNN meteorologists said Seattle could see 100 degrees this week, which would be only the fourth time in recorded history. Other cities will likely see temperatures hit the triple digits.

Desperate times, desperate measures

A little relief is in sight. The high temperatures in Portland should be 91 on Saturday and 97 on Sunday, CNN meteorologists said. Seattle should see highs of 92 on Friday, 89 on Saturday and 90 on Sunday.

Deadly heat waves to become more common

Many Portlanders took to social media to document some of the strange and outrageous ways they are keeping cool, including sticking their feet in a cooler of ice.

It’s been so hot that Scoop PDX, an ice cream business, shut down its food truck Wednesday and Thursday for worker safety.

It’s so hot that Scoop, an ice cream business, shut down its street cart Wednesday and Thursday for worker safety.

CNN affiliate KIRO in Seattle reported numerous cooling centers were open in the city.

Jillian Henze, spokeswoman for the Seattle Hotel Association, said those without air conditioning who are seeking relief will find the supply of rooms scarce. “It is our busiest season of the year; we got cruise ships and summer travel, and rooms are booked up way in advance,” she said.

weather northwest heat warnings

A little relief may be in sight. The high temperatures in Portland should drop to 97 on Friday, 90 on Saturday and 95 on Sunday. the weather service said. Seattle should see highs of 91 on Friday and 89 on Saturday and Sunday.

Related: Hot car deaths reached record numbers in July

What’s causing the heat?

A ridge formed in the jet stream, forcing the stronger winds in the upper atmosphere well into Canada, allowing for clear skies in the Pacific Northwest and the temperatures to rise to extreme levels. Friday into the weekend, the jet stream will flatten, allowing for temperatures to ease near normal.

What it actually feels like by taking into account the humidity and high temps.

Until then, police and agencies are ensuring those most vulnerable receive help. Portland police on Tuesday tried to get people who usually live on the streets into shelters or cooling centers, CNN affiliate KPTV said.

“They really appreciate it because, literally, they are here, they don’t want to walk around because it’s hot out,” Officer Ryan Engweiler told the station. “Just by us driving around giving them the water, giving them the information.”

CNN’s Carma Hassan, Amanda Jackson, Jessica Suerth and Taylor Ward contributed to this report.