The prolonged heat across the Midwest has not only set temperature records, it is also expanding and intensifying drought conditions -- and relief isn't on the horizon for most areas, the National Weather Service reported Thursday.

That's the most in the 12 years that the data have been compiled, topping the previous record of 55 percent set on Aug. 26, 2003. It's also up five percentage points from the previous week.

The drought hasn't been long enough to rank up there with the 1930s Dust Bowl or a bad stretch in the 1950s, David Miskus, a meteorologist at the weather service's Climate Prediction Center, told msnbc.com.

The Drought Monitor noted that the drought is starting to "take a significant toll" on food supplies. "In the primary growing states for corn and soybeans, 22 percent of the crop is in poor or very poor condition, as are 43 percent of the nation’s pastures and rangelands and 24 percent of the sorghum crop."

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