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By Emma Marsden
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The National Weather Service issued an excessive heat warning for several states on Friday, as a severe heat wave is set to affect parts of the nation.
The affected states include Washington, Idaho, North Carolina, Virginia, Maryland, Montana, Oregon, Utah, Nevada, Arizona and California, some of which have already been experiencing excessive heat.
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According to the NWS, daytime highs in parts of these areas could reach dangerously hot conditions with little overnight relief.
The weather warning for northern and central Idaho and parts of central and east Washington is in place from noon Saturday until 10 p.m. Pacific Time Friday, with temperatures expected to reach about 100 degrees Fahrenheit in some places.
In the Orofino and Grangeville region, dangerously hot conditions with a major risk of heat effects are expected from noon Tuesday to 11 p.m. PT on July 12.
In northern North Carolina and central Virginia, a warning is in place from 11 a.m. to 8 p.m. Eastern Time Friday, with a heat index value up to 110 degrees.
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Dangerously hot conditions are forecast for parts of California, with Furnace Creek in Death Valley predicted to reach 129 degrees and parts of Trinity County and the northern interior of Humboldt County reaching 120 degrees. The weather warning is in place until 7 p.m. PT Monday.
Several other areas of Southern, southwestern, and Northern California, including the San Francisco Bay Area, have heat warnings in place for the coming days. The NWS wrote in a warning, "An exceptionally dangerous situation is expected to unfold during this potentially historic and deadly heat event."
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Parts of Arizona—including around the Northwest Plateau, Page, Lake Powell and the Grand Canyon—can expect temperatures between 105 and 122 degrees until 8 p.m. Mountain Time Tuesday.
Portions of northwest and west-central Oregon have a heat warning in place until 8 p.m. PT Monday, with temperatures up to 105 degrees expected.
Nevada regions affected by the heat wave include northern Washoe County, western Nevada Basin and Range—including Pyramid Lake, the greater Reno–Carson City–Minden area, and Mineral and southern Lyon Counties—with daytime temperatures reaching up to 105 degrees. The warning is in effect from 10 a.m. Saturday to 10 a.m. PT Wednesday.
In Baltimore, Maryland, and Washington, D.C., there is an excessive heat warning in place on Friday from noon to 8 p.m. ET, with dangerously hot conditions and heat index values up to 112 degrees expected.
In Utah, an excessive heat warning is in place from 9 a.m. Sunday to 9 p.m. MT Tuesday, including the Glen Canyon National Recreation Area, Lake Powell, lower Washington County and Zion National Park.

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The NWS warns that heat-related illnesses increase significantly during extreme heat, and officials are urging residents to take necessary precautions to stay safe during the heat wave. "Stay cool, stay hydrated, stay informed," the agency wrote in its warnings.
Precautions include drinking plenty of fluids, staying in air-conditioned rooms, staying out of the sun and checking up on relatives and neighbors.
Residents are also advised to take extra precautions when outside, including wearing lightweight and loose-fitting clothing and trying to limit strenuous activities to early morning or evening. Do not leave pets or children in cars. People in the affected states should monitor the latest forecasts and warnings for updates and take action if they see symptoms of heat exhaustion and heatstroke.
As Newsweek previously reported, the Centers for Disease Control and Prevention says heatstroke is the most serious of all heat-related illnesses. The agency warns that it can "cause permanent disability or death if the person does not receive emergency treatment."
The CDC says bystanders should call 911 and wet the affected person's skin—with an ice pack, if possible—while they wait for paramedics.
Heatstroke symptoms include dizziness, headaches, nausea, profuse sweating, confusion, slurred speech and seizures.
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