The Storm Prediction Center has issued a TORNADO watch effective until 10pm this evening for the following counties, Audubon, Carroll, Cass, Crawford, Fremont, Harrison, Mills, Monona, Montgomery, Page, Pottawattamie and Shelby.

DISCUSSION…THUNDERSTORMS WILL ERUPT ALONG THE DRY LINE AS CAP HAS ABOUT ERODED WITH THE ASCENT FROM THE APPROACHING STRONG TROUGH. WITH MLCAPES AOA 2500 J/KG AND 50-60KT OF SHEAR…SUPERCELLS WILL BE THE INITIAL MODE WHICH INCLUDES A VERY LARGE HAIL AND DAMAGING WIND THREAT. TORNADOS ARE ALSO POSSIBLE WITH ANY SUPERCELL. STORMS WILL GROW UPSCALE LATER THIS AFTERNOON WITH POTENTIAL INCREASING FOR A SIGNIFICANT DAMAGING WIND THREAT.