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Major Severe Weather Outbreak November 17


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HRRR and other hires models clearly showing enhanced localized 0-1km helicity (we're talking 600-700+ m2/s2) along the main squall line, furthern indicating an elevated tornado potential. Timing would appear to be 12-1pm CST for Chicago, approximately 2pm CST/3pm EST for the IL/IN border further south and Indianapolis about an hour later. 

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HRRR and other hires models clearly showing enhanced localized 0-1km helicity (we're talking 600-700+ m2/s2) along the main squall line, furthern indicating an elevated tornado potential. Timing would appear to be 12-1pm CST for Chicago, approximately 2pm CST/3pm EST for the IL/IN border further south and Indianapolis about an hour later. 

 

Yeah, this isn't good:

 

hlcy_t7mx16_f11.png

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This seems more like one of those where you position yourself for an intercept.  Storm motion's way too fast to "chase" per se.

Well that was already understood, but yeah.  Now we're going to just sit here and watch.

 

Signature relevant. 

Indeed.

 

You may not even need to leave campus to be in a tornado warning

Yeah, we're going to keep the Wx Center fully staffed, launch a few balloons, and make sure campus is aware.

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It's been really windy down here. Springfield (MO) gusted to 51 mph last hour. I don't think the temp fell below 70 last night. Luckily the SW winds ahead of the front have shunted most of the moisture off to the east and due to that capping around 850mb, it doesn't look like anything will form before the front pushes through. 0-1 km, EHI is about a 5 over me now and that's building NE towards Illinois. 

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Rain just finished. Now its cloudy and drizzle. Here in Chicago. Maybe the rain and clouds will cool down the area?

 

 

might want to pump the brakes...we just broke fully into an uncluttered warm sector...temps are only going to rise.

 

and for the record, where in Chicago are you again?

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What's so unusual/concerning about this setup is the very impressive thermodynamic profiles over the high risk area. Check out the morning sounding from ILX...

 

post-40-0-51954500-1384692766_thumb.gif

 

The remnant elevated mixed layer from 600mb-800mb will help generate quite a bit of CAPE but it may also serve to prevent the storms from quickly going QLCS after initiation. This may lock in discrete storm type for a bit. 

 

Given the amount of shear in place with long and looping hodographs the fact the 12z ILX sounding has >1000 j/kg of CAPE is really impressive. BUFKIT soundings also show a lot of 0-3km CAPE today as well. 

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