Heat dome to scorch much of US, from Midwest to East Coast

Moisture blown northward from the Gulf of Mexico is fuelling the weather

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Summer will make a dramatic entrance in the US this week with a heat dome that will bring stifling temperatures and uncomfortable humidity to millions.

The heat will be particularly worrisome this weekend across wide stretches of Nebraska, Illinois, Wisconsin and Iowa, where forecasters are warning of extreme temperature impacts.

This will be the first stretch of true summertime weather for many from Midwest to the East Coast, said Tom Kines, a meteorologist at private weather company, AccuWeather.

"A lot of those folks have been saying, where's summer? Well, buckle up, because it's coming," said Kines. The humid conditions will make places that exceed 30 degrees Celsius feel as much as 20 degrees hotter, said Kines.