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July 18-27th Severe Weather


Chicago Storm

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Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
431 PM CDT Fri Jul 21 2017

.MESOSCALE DISCUSSION...
426 PM CDT

Severe thunderstorm threat increasing across northern Illinois
late this afternoon within a strongly unstable and moderately
sheared airmass. Couple areas of concern noted per regional obs
and satellite imagery. First, an outflow boundary is draped from
the northern suburbs of Chicago WSW to near the Quad Cities this
afternoon. Satellite imagery reveals changes in the
characteristics of the cloud cover along the boundary suggesting
weakening convective inhibition and would expect thunderstorm
coverage to further increase over the next hour or two along this
boundary. Moderately strong deep layer bulk shear would support
supercell development, and low LCL heights and increased SRH along
the aforementioned boundary suggests there is some threat for
tornadoes this afternoon/evening.

Second area of concern is a warm frontal boundary draped from near
the Quad Cities southeast through near Pontiac to Danville.
Cumulus not really well defined along this boundary at the moment
but there are some thunderstorms developing just south within the
warm sector. If further development occurs along the front,
Bunkers right moving supercell vectors oriented parallel to the
boundary suggest that storms could become latched onto the
boundary which would also be an area of concern for
supercells/tornadoes.

Beyond the next couple hours, strengthening low level jet this
evening will result in renewed thunderstorm development to our
west with training thunderstorms producing heavy rain and a
heightened flooding concern, especially given saturated soils in
place.

Deubelbeiss
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On July 20, 2017 at 1:15 PM, BuffaloWeather said:

A tornado just hit 2 mins from my house!! I can't believe I wasn't able to chase...
 

I saw that on GRLevel 3 when I was following the storms in ON. The purple triangle had a 9 in it which must mean something. Are you familiar with the spot where that viral video of the car getting lifted briefly was captured?
 

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