Showers and thunderstorms have developed across the I-90 corridor and adjacent areas of northwestern Iowa this evening. Conditions are favorable for funnel clouds with any shower or thunderstorm that develops. These types of funnel clouds are usually short lived. However, they can and occasionally do touch the ground and cause minor damage. Therefore, if you see a funnel cloud and feel your safety is threatened, please seek shelter. A funnel cloud has already been reported in Rock county around 5:15 PM CDT with a developing thunderstorm. Showers and storms will diminish after sunset.