U.S. drought expands in top wheat-growing state of Kansas

Crop-killing drought deepened in Kansas over the last week, further jeopardizing this season's production of winter wheat, a key U.S. crop.

Kansas is generally the top U.S. wheat-growing state, but the new crop planted last fall has been struggling with a lack of soil moisture. Without rain and/or heavy snow before spring, millions of acres of wheat could be ruined.

But a new climatology report issued Thursday showed no signs of improvement for Kansas, or neighboring farm states.