858
ACUS11 KWNS 100353
SWOMCD
SPC MCD 100353
INZ000-ILZ000-IAZ000-100600-
MESOSCALE DISCUSSION 1890
NWS STORM PREDICTION CENTER NORMAN OK
1053 PM CDT SUN AUG 09 2026
AREAS AFFECTED...NORTHERN ILLINOIS
CONCERNING...SEVERE THUNDERSTORM WATCH 550...
VALID 100353Z - 100600Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 550
CONTINUES.
SUMMARY...SEVERE POTENTIAL CONTINUES WITHIN WW550.
DISCUSSION...SUPERCELLS AND SUPERCELL HYBRID CLUSTERS CONTINUE
ACROSS PORTIONS OF NORTHERN ILLINOIS. AS THE LOW-LEVEL JET HAS
STRENGTHENED, A FEW LOW TOPPED SUPERCELLS HAVE SHOWN WEAK ROTATION.
ONE SUPERCELL IN LEE COUNTY NEAR THE WARM FRONT/OUTFLOW BOUNDARY
ACROSS NORTHERN ILLINOIS APPROACHED 60 KFT WITH MORE PRONOUNCED AND
LONG LIVED ROTATION AND REPORTS OF A TORNADO. VAD PROFILES FROM KLOT
ARE SAMPLING 0-3 KM SRH AROUND 350-400 M2/S2, WITH WEAKENING FLOW
ABOVE 3 KM. GIVEN THE FAVORABLE LOW-LEVEL SHEAR, TRANSIENT WEAK
ROTATION WILL LIKELY CONTINUE WITH LOW TOPPED CELLS SOUTH OF THE
BOUNDARY. ANY STORM THAT CAN ANCHOR TO THE BOUNDARY MAY HAVE
POTENTIAL FOR A TORNADO IN THE SHORT TERM. MODE IS BECOMING MORE
CLUSTERED THROUGH TIME, WITH INCREASING DAMAGING WIND POTENTIAL
LATER INTO THE OVERNIGHT.
..THORNTON.. 08/10/2026
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT
ATTN...WFO...LOT...ILX...DVN...
LAT...LON 41999078 42238963 42288892 42228818 42088774 41878733
41458738 40908815 40758899 40748977 40889035 41209084
41579095 41999078
MOST PROBABLE PEAK TORNADO INTENSITY...85-110 MPH
MOST PROBABLE PEAK WIND GUST...55-70 MPH
MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 IN
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