Warning as ‘heat dome’ to hit US over SIX DAYS in May with record-smashing temperatures forecast to reach 90 degrees

MILLIONS of Americans are under a heatwave warning as recording-smashing temperatures as high as 90 degrees are expected to scorch the south and the central US.

A prolonged spring heatwave is forecast to toast parts of , the Rockies and the Midwest over the next six days.

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“If you have outdoor plans, be sure to practice heat safety and stay hydrated,” the Austin and San Antonio National Weather Service tweeted.

The heat will also intensify a critical-to-extreme fire threat from to West Texas.

By Tuesday, the sizzling temperatures will expand into St Louis before beaming across , , and several other southern states by Wednesday.

The St Louis Weather Service office said the weather pattern will lock in “an unseasonably warm air mass that will bring several days of surface temperatures approaching daily records for early May.”

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By Thursday, the Great Lakes area is forecast to see temperatures close to the 90-degree mark.

The culprit behind the abrupt change is a "heat dome" of high pressure over the nation's mid-section jet stream.

Among the cities that could see multiple record-high days include Houston, Little Rock, Shreveport, Kansas City and St Louis.

Cooler air arriving from the northwest will push the core of the heat back into Texas and parts of the South on Friday and into the weekend.

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The upcoming heat advisory comes as Texans saw temperatures as high as 112 degrees on Saturday.

At least 10 Texas counties saw temperatures over 100 this weekend, including San Angelo, Amarillo, Abilene, Childress, Lubbock and San Antonio.

DANGEROUS WINDS

Meanwhile, nearly six million Americans are under a red flag weather warning in Colorado as 80mph winds may spark dangerous wildfires.

The rare warning came into effect on Monday morning and lasted until noon as damaging winds from  struck southern .

A high wind warning will remain in effect for parts of south-central Colorado until Monday afternoon.

"High wind warning for Summit county this morning, especially over the high peaks. Wind gusts up to 90 mph can be expected. Weaker winds over the mountain valleys," the Boulder National Weather Service warned.

In addition to the red flag  warning, the Denver metro area thru Greely and parts of the northeastern plains are under a fire weather watch.

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Winds in the Denver metro area may reach 30 to 35 mph, with 50 to 55 mph winds in and near the foothills.

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Strong winds mixed with extremely dry weather conditions and blowing dust could spark dangerous wildfires in the area.