August 6, 2018 Isolated Severe Weather & Flash Flooding Summary

Isolated severe weather with flash flooding & tremendous CG lightning occurred during the evening to night Monday, August 6.

Posted: Aug 7, 2018 9:03 PM
Updated: Aug 7, 2018 11:05 PM

Multi-cells & supercells gradually gelled into a line that dumped torrential rainfall, caused tremendous CG lightning & isolated severe weather in the area.  The lightning signaled an environment loaded with CAPE, while the isolated severe weather with some supercells & bowing signatures showed at least a little bit of wind & shear support aloft.

The three severe weather reports were from Wolcott (on I-65) of estimated gust of 58 mph, wind damage in Saddlebrook (Lafayette) & possible brief tornado touchdown near Radnor.  There were a few other reports of pea to marble hail scattered about.

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It was a hot day with highs in the 80s to 90 with dew points to 77 with heat indices to 100.  Surface CAPE neared 4000 J/kg, resulting in the incredible amoun of energy for storms.  Although an MCV & outflow boundary were the triggers in this environment, it was a reliatively weak MCV.  Should it have been stonger with better shear, much more in the way of severe weather would have occurred.

Here is a supercell that produced an impressive low-level rotation signature near Radnor.  It peaked there & slowly weakened with a track toward Flora.

Tony Johnson caught an image of the wall cloud, mesocyclone striations & beaver tail with the funnel from the pretty classic supercell.  Structure is good in this picture as it is all lit up by lightning.  He told me the funnel looked like it briefly touched down, but no damage has been reported. 

The supercell did not produce the damage in the Saddlebrook subdivision on the southeast side of Lafayette.  This damage occurred from the line.  When it was west of US 231, there were two cores of 40-55 mph gusts seen.  The Purdue Airport, between the two cores, measured a gust to 34 mph. Mike & Erin's weather station near Klondike measured a gust of 25 mph.  A gust of 40 mph occurred at WLFI in the Purdue Research Park.

According to Weather Team 18 meteorologist Balint Szlavari, the minor damage to multiple homes with several trees snapped, garden shed destroyed & deck damaged.  He observed that the width of the damage was no more than 200' with a damage path length of no more than 3 blocks (1/8 to 1/4 mile).  Roof & siding damage occurred to homes & one man suffered an injured knee/leg when a chair was picked up & thrown as it hit (with him in his garage).

This wind occurred with a bulge in the line & a quick uptick in the lightning in that area of the line.  Whether this was a microburst, gustnado or very brief, obscure tornado remains to be seen.  I have not been to the area to check it out, nor has NWS.

NEWS 18 REPORT:

http://www.wlfi.com/content/news/Storms-damage-Lafayette-homes-490300551.html

This core of wind was on radar at the time of the report of "complete white-out" with estimated gust of 58 mph on I-65 near Wolcott.

Interestingly, no reports of damage occurred with this bulge of 60 mph likely gusts (per radar data).  However, wind damage was reported around Thorntown & then near Zionsville.

Overall storm evolution:

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