A Severe Thunderstorm Watch is in effect until 11pm tonight just to the west of Iowa, in Nebraska and South Dakota. There has been several warnings in both states this afternoon including a tornado warning in South Dakota. These storms are moving east at 25 mph. The storms should reach the Missouri/Big Sioux River Valleys by 10-11pm. Rainfall from these storms may exceed 1/2 inch in thunderstorms, otherwise a general 1/4-1/2 inch of rain is likely.