Hot days, and nights, continue Monday as Portland heats to near 104

Portlanders, including Oregon Zoo elephants will be looking for ways to beat the heat as temperatures stay near 100 through about Wednesday. Oregonian file photo. LC- The Oregonian

Portland hit 100 degrees about 3 p.m. Sunday, kicking off a string of triple digit days that are expected to stick around through mid week.

Strong high pressure remains anchored over the region coupled with a warm subsidence layer acting like a blanket will keep a very warm air mass in place across the Pacific Northwest, according to the National Weather Service.

And Portland wasn’t the only hot location. Troutdale set a record for the date, hitting 105 degrees, besting the former record of 104 set in 2002. Hillsboro tied its record of 101, also reached in 2002.

The heat is just getting started. Monday’s highs will jump above 100 with models suggesting areas from Salem to Eugene could reach 108-110 degrees. If they do, this would be the warmest day ever in the month of August in those two cities.

Portland is likely to reach about 104 degrees under sunny skies, and many residents will have a hard time staying cool in that sort of heat.

All heat advisories and excessive heat warnings are still in place through Wednesday. If you need a way to escape the heat, or know someone who needs help, several cooling centers are open in the Portland metro area.

The City of Hillsboro is also offering respite from the heat at one overnight shelter, and several daytime cooling centers. Read more here:

TriMet announced over the weekend that it will not turn away anyone riding to and from a cooling center who cannot pay fare between noon and 10 p.m. during Multnomah County’s extreme heat state of emergency. On buses, riders should tell the operator as they board that they’re heading to a cooling center.

An additional difficulty for those trying to stay cool or at least comfortable is that overnight minimum temperatures will not fall very far the next several nights. Generally, overnight minimum temperatures would cool to the high 50s during mid August. But this heat wave is likely to break several daily records for high overnight “low” temps. The current daily record low temps between Aug. 14-17 range from 65-68 degrees. Portland would be lucky to see temps cool that low. It’s possible early Tuesday temps (overnight’s lowest temps is recorded normally between 4-6 a.m.) will be in the mid-to-high 70s.

That high overnight temp will kickstart another hot day Tuesday where Portland’s heat reaches near 102 degrees.

Some help may be on the way as forecast models are showing a slight shift to a more onshore flow. This may help areas of the mid-to-southern Willamette Valley see a small measure of cooler air move inland. Cities from Albany to Cottage Grove may see a drop in daytime highs to the upper 90s.

Onshore flow will strengthen even more later Tuesday night and bring clouds and fog to the Oregon Coast. It should also offer up some shallow marine clouds in the metro area providing a slight touch of relief from the highest heats on Wednesday. Portland is likely to have a cloudy morning followed by sunny skies and a high of about 99 degrees.

Extended forecasts are showing continued cooling (if you can call it that) by Thursday with highs back down into the low 90s.

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