Bureau County, Illinois Tornado

1 0.25" 40 851
TORNADOES HAIL WIND MILES

June 22nd, 2016 was the start of what I forecast to be a potential 4-day string of severe events across the Upper Midwest and Northern Plains. This first day looked to be in Northwestern Illinois between Sterling and Clinton, Iowa. SPC had forecast a hatched 10% risk of tornadoes east of a surface low tracking from Nebraska into Illinois and along the warm front extending to the east. It’s always hard to pass up a warm front event in Illinois so I left home around 9am and began the westward trek.

My original plan was to wander west to Sterling, Illinois where I would setup shop and wait for the day to get underway. I rolled into Sterling right at 19z and the visible satellite was pretty clear south of the warm front with some percolating cumulus fields in North Central Iowa.

Surface based CAPE values were off the charts with 5,000+ J/Kg across Southeastern Iowa

0-1km Storm Relative Helicity were 200+ m2/s2 across Northern Illinois.

The SPC issued a mesoscale discussion at 2030z for an impending Tornado Watch which was later issued just after 23z. Almost a 3 hour wait between the mesoscale discussion and tornado watch issuance meant I would become impatient. When I become impatient I start driving around waiting for the sky to do something. In this case I began to mosey northwest of Sterling eventually crossing the Mississippi and settling on a dirt road southwest of Clinton, Iowa where I sat once the skies started to percolate.

Visible satellite at 23z with location marked

Brad Goddard met up with me west of Low Moor while we waited. Things finally got going a little before 23z and we were on a storm right at initiation. The photo below is looking west at our newly formed rain free base. This storm would later go on to produce a brief tornado northwest of Manlius, Illinois in about two hours.

We tracked the storm back to the east across the Mississippi stopping every now and then to watch as new wall clouds developed which exhibited decent rotation.

Then as we were stair-stepping along county roads between New Bedford and Manlius, the storm wrapped up and produced a brief tornado.

KDVN radar at 23/0056z with location marked in the inflow notch

Quad Cities later surveyed this area and determined that this was an EF-0 tornado, one of three within Bureau County. We tracked along with the storm until dark without seeing any additional tornadoes, although the storm system spawned at least 15 other tornadoes as the storms crossed into the Chicago County Watch Area.

I decided to head to Blue Earth, Minnesota to play the low chance severe weather in the Northern Plains for the next couple of days.

 


Chase Recap

START END DURATION INTERCEPTS CHASER ENCOUNTERS
Grass Lake, MI @ 22/1308Z Blue Earth, MN @ 23/0722Z 18:13 23/0105Z @ 2 NW Manlius, IL
Brad Goddard (31)
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    May 16, 2017 – Susank, Kansas Tornado
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    April 15, 2017 – Coldwater, Kansas Supercell