 We can expect to see numerous high temperatures of at least 105 to 115 degrees from southern Arizona and southern California through the Central Valley and again into the Las Vegas area, even spreading to areas near Salt Lake City. Furthermore, the heat wave will even expand into parts of the high plains that have been largely left out of the extreme conditions of late, with western portions of the Dakotas and Nebraska in line for highs nearing the triple digits as well under sunshine.