A cone funnel above a whirl of dust and dirt on the ground signal the birth of a tornado very close to the town of Attica, Kansas on May 12, 2004. Notice the 'clear slot', the bright area cutting into the cloud base just behind the funnel. This marks the presence of the 'RFD', or rear flank downdraft, wrapping around the mesocyclone. The formation of a RFD and its associated 'clear slot' often precede the formation of a tornado. Also note the large hailstones on the road, which were falling when this image was taken. Image is from video.
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From Dan: Please Read
To my regular readers, I offer my apologies for this heavy-handed notice. Unfortunately it has become necessary, so please bear with me!
Please don't copy/upload this site's content to social media or other web sites. Those copies have been a critical problem for me, seriously harming this site and my photography/storm chasing operation by diverting traffic, viewers, engagement and income. "Credit" and "exposure" does not benefit this site or my operation, rather they threaten my ability to cover my operating expenses. Please read my full explanation for this notice here.
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