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Severe Threats Apr. 24-May 1


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Proximity sounding (HRRR) at 23z, southwest of Indianapolis. The 51 kt effective shear was one of the main factors powering the discrete supercells. Then there's the question of how much SRH the supercells could use-- was it 71 m2/s2 (effective) or the full 140 m2/s2 (3km fixed layer) ?

 

gV8hW3Y.png

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View from 6 miles south as it went by. Too far to see anything but low scud. Some friends of mine took some serious hail damage on their car, on i74 east of town. Didn't chase this, would have been fun but not in the city. Been there done that with power lines down and traffic. 

post-1951-0-35368700-1462157608_thumb.jp

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Sweet picture Sidewinder.

 

Storm passed right over the airport, but I think their ASOS has been smoking something. No damage reported at the airport.

 

INDIANAPOLIS,IN (IND) ASOS reports gust of 72.0 knots from W @ 0239Z KIND 020243Z 10SM BKN043 BKN055 15/13 A2986 RMK AO2 PK WND 28072/0239 RAE37 TSE37 OCNL LTGIC VC NE P0028 T01500128

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Sweet picture Sidewinder.

 

Storm passed right over the airport, but I think their ASOS has been smoking something. No damage reported at the airport.

 

INDIANAPOLIS,IN (IND) ASOS reports gust of 72.0 knots from W @ 0239Z KIND 020243Z 10SM BKN043 BKN055 15/13 A2986 RMK AO2 PK WND 28072/0239 RAE37 TSE37 OCNL LTGIC VC NE P0028 T01500128

https://twitter.com/NWSIndianapolis/status/726958945080860672

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Fun little chase down in southeast, and eastern Illinois today.  Kind of snuck up on me, as I didn't realize there would be a setup until when I woke up this morning lol.  Guess I should pay a little more attention to the models.  

 

The setup had a lot going for it, including great mid-upper level flow for some great stretching/exhausting aloft.  Instability wasn't too shabby either, with dews in the low 60s, and LCLs were reasonable as well.  Nice little vort max and associated vorticity advection was in play as well.  What really screwed this setup was a awful lack of kinematics below 850mb.  Just a crying shame.  Could have had a very potent setup here.  As it were, we had decent supercells develop, but they all failed to produce anything other than large hail, with the exception of the cell in central IN.

 

Drove down to near Effingham IL by about 4:30.  Right around that time I noticed the cu field to the west was quickly becoming impressive, with nice vertical development.  Wasn't long before the first turkey tower went up, and glaciated northwest of Effingham.  Subsequent updrafts achieved thunderstorm status, and before long we had a nice little sup heading towards the Mattoon area.  It didn't take long for it to produce a weak wall cloud.  Followed the sup east to near the Indiana border where I let it go.  Almost ended u regretting that decision, as shortly thereafter it organized again, and began to look very impressive.  I was almost certain it was finally going to produce now that I had given up on it lol.  Luckily (for me) it didn't.  The storm did drop tennis ball size hail though at one point.

 

Not the most exciting chase to be sure, but man was it nice to be down there in that 70 degree/60+ dew air compared to the grungy 40s and rain back home.  That in itself was worth it to me lol.

 

Here's a few pics...

 

Weak wall cloud beneath the updraft fairly early on...

jua26q.jpg
 
 
Very nice flanking line feeding into the sup from the beginning.  Sup had huge potential if we had better low-levels...
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RFD trying to do something here.  A little far away at this point, but you can see a little lowering on the other side of the rain shaft.  Had a few nice RFD cuts at times, but it didn't seem to help at all.
15hos5u.jpg
 
 
Shortly after letting the storm go near the Indiana border.  Nice little rainbow on the back side of the departing sup.
1eo8g.jpg
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Wow totally was not paying attention to today's potential. Some impressive hail reports coming from some of those cells

Edgar County- ping pong ball size hail (1.5" diameter)

Jasper & Coles- golf ball size hail (1.75" diameter)

Also some wind reports too.

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