The sun rises Sunday, July 15, 2012, in Pleasant Plains, Ill. Corn struggled in the summer heat, but there's been little relief as the months have worn on in drought conditions. (AP Photo/Seth Perlman)

A tree trunk rests on the bed of a dried lake, the outcome of severe drought, in Waterloo, Neb., Tuesday, Nov. 20, 2012. A new report shows that the nation's worst drought in decades is getting worse again, ending an encouraging five-week run of improving conditions. The weekly U.S. Drought Monitor report shows that 60.1 percent of the continental U.S. was in some form of drought as of Tuesday. That's up from 58.8 percent the previous week. The portion of the lower 48 states in extreme or exceptional drought — the two worst classifications — also rose, to 19.04 percent from last week's 18.3 percent. (AP Photo/Nati Harnik)

Empty shells rest on the cracked bed of a dried lake, the outcome of severe drought, in Waterloo, Neb., Tuesday, Nov. 20, 2012. A new report shows that the nation's worst drought in decades is getting worse again, ending an encouraging five-week run of improving conditions. The weekly U.S. Drought Monitor report shows that 60.1 percent of the continental U.S. was in some form of drought as of Tuesday. That's up from 58.8 percent the previous week. The portion of the lower 48 states in extreme or exceptional drought — the two worst classifications — also rose, to 19.04 percent from last week's 18.3 percent. (AP Photo/Nati Harnik)

Cracks form in the bed of a dried lake, the outcome of drought in Waterloo, Neb., Tuesday, Nov. 20, 2012. A new report shows that the nation's worst drought in decades is getting worse again, ending an encouraging five-week run of improving conditions. The weekly U.S. Drought Monitor report shows that 60.1 percent of the continental U.S. was in some form of drought as of Tuesday. That's up from 58.8 percent the previous week. (AP Photo/Nati Harnik)

RICH HILL, MO - AUGUST 8: Corn tassles wave in in a field. During a devastating season of drought, crops like corn have not fared well. (Photo/ Julie Denesha For The Washington Post)

WALKER, MO- AUGUST 8: Workers bale a poor soybean crop to feed cattle. In the second back-to-back year of drought, farmers are having to make tough decisions on their crops. (Photo/ Julie Denesha For The Washington Post)

RICH HILL, MO- AUGUST 8: Soybeans shriveled by a summer without rain. (Photo/ Julie Denesha For The Washington Post)

PLATTE CITY, MO- AUGUST 7: Corn shriveled by a summer without rain. (Photo/ Julie Denesha For The Washington Post)

The last remaining water in a drought-stricken rural pond reflects the sky and clouds near Calumet, Okla., Friday, July 20, 2012. The nation's widest drought in decades is spreading. More than half of the continental U.S. is now in some stage of drought. (AP Photo/Sue Ogrocki)

BEAN LAKE, MO- AUGUST 7: Bean Lake in the Missouri River flood plain, was underwater during last year's floods, now it it parched and cracked by drought. (Photo/ Julie Denesha For The Washington Post)

RICH HILL, MO - AUGUST 8: Pasture, like this one enrolled in the federal Conservation Reserve Program has been released for haying and grazing by livestock farmers due to drought conditions in the Midwest. (Photo/ Julie Denesha For The Washington Post)

Heat rising from the ground causes optical distortions as a vehicle travels a gravel road near Mead, Neb., in this photo from July 31, 2012. The latest U.S. Drought Monitor survey shows an increase in extreme drought conditions in four Plains states but a slight decrease in the overall area of the lower 48 states experiencing some form of drought. (AP Photo/Nati Harnik)

WALKER, MO - AUGUST 9: Myrl Julian (from left) and Brent Gundy talk about 1980, another time of great drought in the region. Gundy has rented land from Julian since his early days as a rancher. (Photo/ Julie Denesha For The Washington Post)

SCHELL CITY, MO- AUGUST 7: Corn stalks lay on the ground in a field parched by high temperatures an little rain. (Photo/ Julie Denesha For The Washington Post)

Corn stalks struggling from lack of rain and a heat wave covering most of the country are seen Monday, July 16, 2012 in Farmingdale, Ill. The nation's widest drought in decades is spreading. More than half of the continental U.S. is now in some stage of drought, and most of the rest is abnormally dry. (AP Photo/Seth Perlman)

Corn stalks struggling from lack of rain and a heat wave covering most of the country are seen Monday, July 16, 2012 in Farmingdale, Ill. The nation's widest drought in decades is spreading. More than half of the continental U.S. is now in some stage of drought, and most of the rest is abnormally dry. (AP Photo/Seth Perlman)

Corn stalks struggling from lack of rain and a heat wave covering most of the country are seen Monday, July 16, 2012 in Farmingdale, Ill. The nation's widest drought in decades is spreading. More than half of the continental U.S. is now in some stage of drought, and most of the rest is abnormally dry. (AP Photo/Seth Perlman)

Corn stalks struggling from lack of rain and a heat wave covering most of the country are seen Monday, July 16, 2012 in Farmingdale, Ill. The nation's widest drought in decades is spreading. More than half of the continental U.S. is now in some stage of drought, and most of the rest is abnormally dry. (AP Photo/Seth Perlman)

Corn stalks struggling from lack of rain and a heat wave covering most of the country are seen Monday, July 16, 2012 in Farmingdale, Ill. The nation's widest drought in decades is spreading. More than half of the continental U.S. is now in some stage of drought, and most of the rest is abnormally dry. (AP Photo/Seth Perlman)

Corn stalks struggling from lack of rain and a heat wave covering most of the country are seen Monday, July 16, 2012 in Farmingdale, Ill. The nation's widest drought in decades is spreading. More than half of the continental U.S. is now in some stage of drought, and most of the rest is abnormally dry. (AP Photo/Seth Perlman)

This photo from July 31, 2012 shows dried corn plants in Yutan, Neb. The latest U.S. Drought Monitor survey shows an increase in extreme drought conditions in four Plains states but a slight decrease in the overall area of the lower 48 states experiencing some form of drought. (AP Photo/Nati Harnik)

Corn stalks struggling from lack of rain and a heat wave covering most of the country are seen Monday, July 16, 2012 in Farmingdale, Ill. The nation's widest drought in decades is spreading. More than half of the continental U.S. is now in some stage of drought, and most of the rest is abnormally dry. (AP Photo/Seth Perlman)

Tiny shoots try to grow in the bed of a dried pond in this photo from July 31, 2012. The latest U.S. Drought Monitor survey shows an increase in extreme drought conditions in four Plains states but a slight decrease in the overall area of the lower 48 states experiencing some form of drought. (AP Photo/Nati Harnik)

The top of a corn stalk struggling from lack of rain and a heat wave covering most of the country is seen Monday, July 16, 2012 in Farmingdale, Ill. The nation's widest drought in decades is spreading. More than half of the continental U.S. is now in some stage of drought, and most of the rest is abnormally dry. (AP Photo/Seth Perlman)

Cattle seek refuge from the heat under a tree near Wayne, Okla., Thursday, July 26, 2012. The drought that is worsening across the U.S. is also intensifying in Oklahoma, the U.S. Drought Monitor reported, leaving cattle ranchers looking for ways to feed their herds. (AP Photo/Sue Ogrocki)

Corn stalks struggling from lack of rain and a heat wave covering most of the country lie flat on the ground Monday, July 16, 2012 in Farmingdale, Ill. The nation's widest drought in decades is spreading. More than half of the continental U.S. is now in some stage of drought, and most of the rest is abnormally dry. (AP Photo/Seth Perlman)

Rows of corn stalks stand under a cloudless sky south of Blair, Neb., Monday, July 23, 2012. The drought-damaged field was cut down for silage. (AP Photo/Nati Harnik)

Drought-damaged corn is seen near Brownville, Neb., Thursday, July 26, 2012. The widest drought to grip the United States in decades is getting worse with no signs of abating. The drought covering two-thirds of the continental U.S. had been considered relatively shallow, the product of months without rain, rather than years, but a report released Thursday showed its intensity is rapidly increasing, with 20 percent of the nation now in the two worst stages of drought, up 7 percent from last week. (AP Photo/Nati Harnik)

A cow tries to eat from a dried out cactus on a field near the city of Torreon, Mexico, Thursday Dec. 1, 2011. Mexico is seeing the worst drought since 1941, when the country began recording rainfall. Drought will continue to plague northern Mexico during the winter months, and the situation will likely worsen, authorities said. (AP Photo/Alberto Puente)

The sun rises Sunday, July 15, 2012, in Pleasant Plains, Ill. Corn stalks are struggling in the heat and continuing drought that has overcome most of the country. All of Illinois is officially in a drought, and Illinois Gov. Pat Quinn plans a trip to southern Illinois to discuss the state's plans for responding to dry conditions. (AP Photo/Seth Perlman)

Central Illinois farmer Jimmy Ayers walks through his stunted field corn that has still not pollinated as drought and heat have overcome most of the country Friday, July 13, 2012 in Rochester, Ill. All of Illinois is now officially in a drought, and Illinois Gov. Pat Quinn plans a trip to southern Illinois to discuss the state's plans for responding to dry conditions. (AP Photo/Seth Perlman)

A small alligator crawls along a canal bed outside Okeechobee, Fla. Wednesday, June 8, 2011. Boaters report a larger than normal amount of gators on Lake Okeechobee with the low levels of water. South Florida's drought problem has reached a critical stage. The National Weather Service rates parts of South Florida at drought stage, D4, or the "exceptional drought" stage. (AP Photo/J Pat Carter)

Central Illinois cattle stand in a pasture struggling from lack of rain and a heat wave covering most of the country, Friday, July 20, 2012, in Farmingdale, Ill. The nation's widest drought in decades is spreading. More than half of the continental U.S. is now in some stage of drought, and most of the rest is abnormally dry. (AP Photo/Seth Perlman)

A corn crop stands severely stunted at Mineral Point, Wis. on Monday 30 July, 2012 as the result of a punishing drought that has affected much of the USA's Midwest. (AP Photo/Sitthixay Ditthavong)

Corn stalks struggling from lack of rain and a heat wave covering most of the country are seen Monday, July 16, 2012 in Farmingdale, Ill. The nation's widest drought in decades is spreading. More than half of the continental U.S. is now in some stage of drought, and most of the rest is abnormally dry. (AP Photo/Seth Perlman)

Corn stalks struggling from lack of rain and a heat wave covering most of the country are seen Monday, July 16, 2012 in Farmingdale, Ill. The nation's widest drought in decades is spreading. More than half of the continental U.S. is now in some stage of drought, and most of the rest is abnormally dry. (AP Photo/Seth Perlman)

Empty shells rest on the cracked bed of a dried lake, the outcome of severe drought, in Waterloo, Neb., Tuesday, Nov. 20, 2012. A new report shows that the nation's worst drought in decades is getting worse again, ending an encouraging five-week run of improving conditions. The weekly U.S. Drought Monitor report shows that 60.1 percent of the continental U.S. was in some form of drought as of Tuesday. That's up from 58.8 percent the previous week. The portion of the lower 48 states in extreme or exceptional drought — the two worst classifications — also rose, to 19.04 percent from last week's 18.3 percent. (AP Photo/Nati Harnik)