Temperatures expected to surge past 110 F/43.3 C during heat wave in US

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The first heat wave of the season is bringing triple-digit temperatures earlier than usual to much of the southwestern United States, where forecasters warned residents Tuesday to brace for "dangerously hot conditions" with highs expected to top 110 degrees Fahrenheit (43.3 Celsius) in the days ahead in Las Vegas, Nevada, and Phoenix, Arizona.

By Wednesday, most of an area stretching from southeastern California to central Arizona will see "easily their hottest" weather since last September and record daily highs will be in jeopardy throughout the region, the National Weather Service said.

Excessive heat warnings have been issued from 10 a.m. Wednesday to 8 p.m. Friday for parts of southern Nevada and Arizona. The unseasonably hot weather is expected to make its way into parts of the Pacific Northwest by the end of the week.

"We're looking at high temperatures well in the 90s and 100s, temperatures well above average for the time of year ? some spots as much as 10 to 20 degrees above average," National Weather Service meteorologist Marc Chenard said on Tuesday.

Southeastern California, southern Nevada and much of Arizona will be affected most, he said.

"As we go through the week, some of those higher temperatures are also going to spread north, potentially getting into portions of the Pacific Northwest as well," Chenard said.

"We do have several days where these temperatures will persist, and that usually adds to the impact. If there is just one day, it doesn't tend to have as much of an impact," he said. "But when you start getting two, three or four days, this heat and then even warm temperatures at night, you start to see the impact increase."

The unseasonably hot weather already has taken a toll in some areas. The U.S. Border Patrol reported on Monday that four migrants died last weekend from heat-related causes while attempting to cross the border in southeastern New Mexico, near El Paso, Texas.

Border Patrol El Paso Sector Chief Anthony Good urged migrants not to try to cross the border in the extreme heat.