It's not that the Midwest hasn't been extremely hot before, and it's not that it hasn't been incredibly dry. But it's unusual for a vast swath of the Midwest to be so very hot and so very dry for so very long - particularly this early in the summer. The current heat wave - which is spurring comparisons to the catastrophic heat of 1936 - is "out of whack," meteorologist Jim Keeney said Friday in an interview with the Los Angeles Times. "Even on the East Coast today, temperatures are 100 or above" - basically, Keeney said, the heat wave extends from Kansas all the way to the East Coast.

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"It's a good chunk of the eastern half of the country, barring the far northern states, of course. So it's pretty intense." Temperature records are being broken and residents are suffering in what Keeney called a "corridor of extreme heat," generally through Nebraska, Kansas, Missouri, Illinois, Indiana and into western Kentucky. Heat records are being shattered as are records for the number of days in a row the temperature has hit 100 or higher, he said.

Take St. Louis, for example. The last time the city was this hot for this long was in 1936, said Keeney, a meteorologist with the National Weather Service Central Region Headquarters in Kansas City, Mo. Then, the city recorded 13 days in a row of temperatures 100 degrees Fahrenheit or over. That devastating heat wave of the mid-'30s killed thousands of people and destroyed many crops.

The culprit in the current wave is a dome of high pressure that has been hovering over the eastern part of the U.S., said NWS spokesman Pat Slattery in an interview with The Times on Friday. "It's kicked the jet stream way to north, in some places into Canada, so there's no way for the normal rotation of weather systems to get here into the middle of the country, which would bring us some moisture. So drought becomes more and more a major factor."