Historic heatwave continues in Northwest as drenching downpours soak the Midwest


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Temperatures reached triple digits in major cities like Portland and Seattle.

The hottest heat wave to ever hit the Pacific Northwest is continuing to scorch the typically cool region with triple-digit temperatures.

Seattle is forecast to hit its all-time high of 104 degrees Sunday — one day after breaking the record for hottest temperature in June at 101 degrees. The previous all-time high in Seattle was 101 degrees.

Seattle has only recorded triple digits twice in history, Karin Bumbaco, the assistant state climatologist for Washington state, told ABC News.

In Portland, temperatures reached 108 degrees on Saturday, breaking the all-time record of 107 degrees. The city is set to break its record again on Sunday with a forecast high of 112 degrees.

The upcoming heat wave follows several recent record-breaking heat waves that have developed due to a blocking pattern in the upper air flow across the Northern Hemisphere. When the sun is at a higher angle, it weakens the jet stream, meaning the hot air mass gets even hotter.

In the Midwest, heavy rain is expected to come down in parts of Texas and Oklahoma.

A flash flood watch is in effect in parts of the region through Sunday night, but the ground is already saturated from clusters of storms in the Midwest on Saturday.

Since Thursday afternoon, the highest rainfall totals so far are in Chanute, Kansas, at 8.57 inches, Edmond, Oklahoma, at 7.14 inches and Bloomington, Illinois at 6.32 inches.

The highest reported storm gust on Saturday came in at 88 mph in Lamesa, Texas, and golfball-sized hail was reported in Wickett, Texas.

Showers and storms will continue to develop around the slow-moving frontal boundary that extends from western Texas and New Mexico into the Great Lakes.

Rainfall rates could approach 2 to 3 inches per hour at times.

Strong storms with gusty winds are also possible from Missouri to Michigan, where widespread flooding occurred near Detroit on Saturday due to the storms.

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