<pre>ACUS11 KWNS 092320
SWOMCD
Mesoscale Discussion 0891
NWS Storm Prediction Center Norman OK
0620 PM CDT Tue Jun 09 2020
Areas affected...northern Illinois/Indiana and vicinity
Concerning...Severe potential...Watch possible
Valid 092320Z - 100115Z
Probability of Watch Issuance...40 percent
SUMMARY...A brief, weak tornado or two are possible across northern
Illinois/Indiana and possibly into far southwest Michigan. While the
severe threat is likely isolated, trends will be monitored for a
possible tornado watch.
DISCUSSION...Tropical Depression Cristobal is continuing to move
northward across the Midwest with a deep, well defined surface low
in eastern Iowa/northwest Illinois. Breaks in the clouds across
portions of central/northern Illinois/Indiana has led to some
stronger instability with satellite/radar imagery showing a slight
uptick in convection recently. Low-level shear remains strong with
larger hodographs east of the surface low. Transient weak rotation
has been observed with a few convective cells, but convection is
remaining somewhat weak, with relatively narrow updrafts. However,
given the presence of low-level helicity and potential convective
intensification associated with increasing destabilization, a couple
of brief, weak tornadoes and convectively-aided strong wind gusts
are possible across the area this evening.
..Nauslar/Hart.. 06/09/2020
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...IWX...IND...LOT...ILX...MKX...DVN...
LAT...LON 41398920 41838917 42208906 42518874 42488781 42288688
42048635 41448587 41068573 40878571 40388610 40218663
40218834 40708902 41398920 </pre>
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