by: TRIBUNE PHOTO: JAIME VALDEZ - Alyssa Dietz, 5, of Beaverton, drenches herself in the Beaverton City Fountain Park while holding a Gopro camera during Tuesday afternoon's hot weather.
Oh, man, it is hot. But, don’t expect it to last.

Tuesday’s heat that settled over the region is expected to gradually dissipate Tuesday night as the marine clouds return Wednesday, bringing cooler weather for the rest of the week, according to the National Weather Service.

By mid-afternoon, the temperature hit 97 degrees in parts of the city, forcing TriMet’s rail systems to slow. MAX light-rail trains have to run about 10 mph slower when the temperatures climb above 90 degrees, as a precaution to prevent damage to overhead power lines that sag in the heat.

TriMet officials said riders should expect minor delays in afternoon MAX runs.

The WES commuter train in Washington County also was forced to run at reduced speeds, no more than 35 mph, to ensure that there were no heat-related issues on the track from Wilsonville to downtown Beaverton.

Trains could have up to 15-minute delays on all afternoon trips, TriMet officials said.

Once cooler air filtered into the region Tuesday evening, the trains began running at normal speeds.

TriMet officials said the trains would run on the usual schedule and speed Wednesday, July 2.

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