Maps show heat wave forecast across the U.S. Here's what to know.

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A vigor question is forecast crossed the eastbound United States, and it's expected to bring terrible storms and respective days of grounds precocious temperatures astatine the commencement of the play and into adjacent week.

As a low-pressure strategy dilatory shifts from the West, the Ohio Valley and the Midwest down into the little Mississippi Valley look the menace of tornadoes, ample hail and damaging winds, according to CBS News meteorologist Nikki Nolan. As the strategy moves eastward, showers and storms are besides connected platform for parts of the Northeast done Thursday. Behind the strategy are lukewarm and above-average temperatures, oregon what the National Weather Service called "the archetypal important vigor question this season."

Temperatures are expected to soar much than 25-35 degrees supra mean successful the Plains connected Friday, Nolan said. Potential regular grounds highs are besides forecast for parts of the Rockies and Plains connected Friday and Saturday.

Here's what to cognize astir the upcoming vigor wave.

Heat question forecast maps

"Summer has taken its clip arriving successful the Northeast, but it's coming successful HOT," the National Weather Service wrote Wednesday successful a societal media post. "Triple-digit vigor indices volition beryllium communal done adjacent week, with oppressive humidity."

The heat index is what the existent somesthesia feels similar erstwhile it's combined with comparative humidity.

These maps amusement regular highs crossed the state and their departures from mean temperatures.

Friday's precocious temperatures crossed the U.S.

How agelong volition the vigor question last?

The vigor is expected to displacement into the Midwest and Ohio Valley by the extremity of the play and get successful the Northeast and mid-Atlantic connected Sunday done the archetypal fractional of adjacent week.

Parts of the Northeast look a "High Risk" — a greater than 60% accidental — of utmost vigor done the mediate of adjacent week, according to the National Weather Service.

What constitutes a vigor wave?

A vigor question is simply a play of unusually blistery upwind that lasts much than 2 days, according to the National Weather Service.

It often, but not always, covers a ample country and exposes a ample fig of the colonisation to hazardous heat, which tin beryllium highly unsafe for susceptible people, including children and the elderly.

How to enactment harmless during a vigor wave

The simplest mode to mode to avoid heat-related illnesses is to enactment retired of the sun, experts say.

If strenuous outdoor activities are unavoidable, you should formal for the vigor and deterioration lightweight, loose-fitting and light-colored clothing, the National Weather Service recommended. You should also stay hydrated by drinking plentifulness of water, adjacent if you're not thirsty.

It's besides important to beryllium alert of immoderate symptoms of overheating, which see musculus cramps, unusually dense sweating, shortness of breath, dizziness, headaches, weakness oregon nausea, according to the Centers for Disease Control and Prevention. If you acquisition these symptoms, 1 large motion to question attraction is if the symptoms don't amended aft getting into a cooler situation oregon hydrating, experts say.

Nikki Nolan contributed to this report.