National Weather Service United States Department of Commerce

Significant Severe Weather Outbreak Likely Today

A significant severe thunderstorm outbreak is likely for portions of the Midwest this afternoon and evening, especially from eastern Iowa into northern and central Illinois. The threats include tornadoes, a few which may be significant, large to very large hail, and damaging winds. A powerful system near the Central Plains will lift north and clash with a warm and humid air mass over the region. Read More >

Slide 12

Misconception  of Tornadic Winds

One misconception is that the wind associated with a tornado is confined to within the visible funnel cloud. This might be analogous to thinking of the tornado as a vacuum cleaner hose hanging out of the sky. One possibility why many people think that being under an overpass offers protection is that with something above them, the bridge will prevent the wind from going ‘up’ underneath the overpass.

A description of the situation much closer to reality is presented in slide 14 and slide 5.

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