A historic heat wave in the West was forecast to roll eastward this week after Phoenix, Las Vegas and Denver joined a plethora of cities and towns posting record temperatures and more than 50 million Americans sweltered under heat advisories.
Southerly winds will pump hot, humid air into the eastern two-thirds of the nation through Wednesday, forecaster WeatherBug warned. The result: temperatures ranging from 10 to 30 degrees above normal for this time of year.
Farther west, weekend temperatures in California’s Death Valley climbed above 120 degrees while in Phoenix, a man grilled burgers and baked a cake on his dashboard. Parts of Missouri, Kansas, Louisiana and Mississippi also saw weekend heat advisories.
Blame a northward bulge in the jet stream that unfolded over the Southwestern states this week, allowing air more typical of midsummer to spread over the region. A "drastic and intense warmup" is on tap for more of the nation this week as the jet stream lifts north, AccuWeather warned.