(PHOENIX) -- Record-shattering temperatures are expected to continue on Sunday as a rare and strong early-season heat dome has resulted in triple-digit highs in some parts of the Western U.S.
As the temperatures soared to 105 degrees on Saturday in Phoenix, Ariz., the third-straight day the weather has topped the 100-degree mark, more than 400 people attending an airshow in nearby Glendale were treated for heat-related illnesses, authorities said.
At least 25 people attending the Luke Days Airshow at Luke Air Force Base were overcome by the sweltering weather and had to be hospitalized for various heat-related illnesses, U.S. Air Force Brig. Gen. David Berkland said at a news conference on Saturday, according to ABC affiliate station KNXV in Phoenix.
Berkland said the majority of the people treated were under the age of 12 or over the age of 60, and many also had "pre-existing medical conditions like heart disease, diabetes or pregnancy."
Dozens of locations across the West have broken high-temperature records since Thursday, and some areas in the Plains have also seen records fall.
The temperature in Phoenix reached 105 degrees for the third straight day on Saturday, tying a record for March. In Tucson, temperatures soared to 102 on Saturday. Las Vegas, Nev., hit 96 on Saturday, the second-highest temperature there for March behind the 97-degree record set on Friday.
Elsewhere in the West, Salt Lake City, Utah, and Denver, Colo., set new highs for March when they hit 84 and 86 degrees, respectively, on Saturday,
Hot weather also stretched across the Midwest and Great Plains. Omaha, Neb., recorded 96 degrees on Saturday, while Wichita, Kan., and Kansas City, Mo., each reached 93.
Extreme heat warnings remain in effect for parts of southern California, Nevada and Arizona on Sunday, including Las Vegas, Phoenix, Tucson and Lake Havasu, Ariz.
Phoenix is likely to surpass the 100-degree mark again on Sunday, the fourth-straight day the city is expected to surpass that temperature. Las Vegas and Salt Lake City could also see additional daily records heading into Monday.
Hot weather is forecast to continue to move into the South and the Ohio Valley, where dozens of daily records could be broken from interior California to Texas and the Carolinas, including the cities of Sacramento, Las Vegas, Albuquerque, Dallas, Oklahoma City, Memphis, New Orleans, Cincinnati and Raleigh.
Severe weather in store for southern Indiana and Pennsylvania
Some severe storms are possible for southern Indiana and most of Pennsylvania later Sunday and into Sunday night and could include damaging winds and large hail. Isolated tornadoes are also possible for a sliver of Ohio, the northern panhandle of West Virginia and southwest Pennsylvania.
By late Sunday night, a line of scattered storms will likely stretch from Evansville, Ind., to Columbus, Ohio, and into State College, Pa.
New York City could also see a couple of thunderstorms, some strong enough to produce gusty winds and possibly small hail.
Critical fire weather threat in the Plains
Millions of people across the Plains are under red flag fire warnings on Sunday due to low humidity, warm temperatures, gusty winds and dry vegetation. The fire danger is expected to continue Sunday before improving a bit into Monday.
Meanwhile, several wildfires are still burning further north in Nebraska and South Dakota.
Fire crews in Nebraska have made significant progress in battling the Morrill Fire, largest wildfire in state history. The blaze, which has burned more than 640,000 acres across multiple counties in western Nebraska, was 98% contained as of Saturday night, according to the Nebraska Emergency Management Agency.
Another large Nebraska wildfire, the Cottonwood Fire in the south-central part of the state, has burned nearly 130,000 acres and was 94% contained on Saturday night, according to the Nebraska Emergency Management Agency.
More damaging floods in Hawaii
After a damaging flood event more than one week ago during which parts of Hawaii recorded rainfall by feet, more rain has brought damaging and impactful flooding across parts of the island.
A flash-flood warning was in effect Saturday for potentially life-threatening flooding on Oahu and the potential for the Wahiawa Dam to fail. There were several reports of damage, water rescues and road closures due to flooding.
The threat of the Wahiawa Dam failing has subsided as water levels gradually subside, but any heavy pockets of rain could cause rapid water rises and reinvigorate the threat.
The heaviest rain has shifted eastward, with the island of Molokai under a flash-flood warning on Sunday.
All Hawaiian islands except Kauai remain under a flood watch through Sunday for more heavy rain. The heaviest rain is expected mostly on the Big Island and the island of Maui, but the other islands will see some rain showers and perhaps some isolated heavy pockets of rain.
Thunderstorms will be possible at times, which may include damaging winds.
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