A funnel cloud with no severe storms…say what??

What a sight to see! Many walked outside yesterday afternoon to find a rope funnel stretching down from a field of cumulus clouds in DeKalb and Ogle counties. Severe weather was not in the forecast, as the atmosphere was not primed for thunderstorm or tornado development. The combination of low level convergence (or air coming together near the Earth’s surface) and a pocket of moist air located under the updraft region of the cumulus field was what caused the funnel cloud to form. Vertical wind shear (or the change in wind direction with height) added some weak rotation and aided in the funnel’s extension from the cloud towards the surface.


Posted under weather geek

This post was written by qni_it on July 30, 2011

7 Comments so far

  1. WI Weather Buff July 31, 2011 6:33 PM

    Okay, so Alyssa (heh heh, you won’t get easy questions here on the WREX Weather Blog…) how does this kind of a funnel differ from cold air funnels, which we’ve discussed on this Blog in the past. Is the genesis different, and if so how?

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