First Tornado Warning of Day: Northern Illinois

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Take cover Amboy and Rochelle!!

Very strong rotation, closeup view. Radar 4:47pm.

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Meteorology: Tornado or Side Lobes?

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This past Friday, we had a great example of how a meteorologist can tell the difference between side-lobes (a false echo that mimics a tornado's circulation on radar) and one indicating a tornado is forming or in progress. I'm going to walk you through it so young meteorologists, in a similar case, won't make the mistake of mistaking side lobes for a tornado.  This case was in north central Texas on February 2nd. I'm using the Abilene/Sweetwater WSR-88D and the software is RadarScope. When I draw on one panel of the screen, it shows up on the other in the same place, so the measurements are about as exact as any in meteorology.  The Thunderstorm Cluster, 4:24pm Above is a cluster of thunderstorms with the two storms with arrows starting to transition to supercells. We already have the northern storm (just south of Aspermont)  moving north northeast. In a situation like this, the storm will likely be "a hailer" -- meaning it is likely to produce hail, possibly ...
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