105
ACUS11 KWNS 271717
SWOMCD
SPC MCD 271716
WIZ000-271845-
MESOSCALE DISCUSSION 1761
NWS STORM PREDICTION CENTER NORMAN OK
1216 PM CDT MON JUL 27 2026
AREAS AFFECTED...EAST-CENTRAL WI
CONCERNING...SEVERE THUNDERSTORM WATCH 519...
VALID 271716Z - 271845Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 519
CONTINUES.
SUMMARY...VERY LARGE HAIL AND TORNADO POTENTIAL MAY PERSIST THE NEXT
1-2 HOURS AS A CELL NEAR WINNEBAGO AND CALUMET COUNTIES CONTINUES
SOUTHEAST.
DISCUSSION...A SUPERCELL OVER FAR NORTHEAST WINNEBAGO AND CALUMET
COUNTIES LIKELY PRODUCED A DAMAGING TORNADO RECENTLY BASED ON STRONG
ROTATION AND TDS FROM KGRB RADAR. THE DOWNSTREAM AIRMASS REMAINS
VERY UNSTABLE WITH EFFECTIVE LAYER STP APPROACHING 4 TO 6 IN A
CORRIDOR SOUTHEAST OF ONGOING STORMS. GIVEN STEEP LAPSE RATES,
FAVORABLE THERMODYNAMICS AND STRONG EFFECTIVE SHEAR GREATER THAN 50
KT SUPPORTING CONTINUED SUPERCELL STRUCTURES, A RISK FOR VERY LARGE
HAIL UP TO 2.5 INCHES AND A CONTINUED RISK OF STRONG TORNADOES MAY
CONTINUE FOR ANOTHER 1-2 HOURS.
..LEITMAN.. 07/27/2026
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT
ATTN...WFO...GRB...MKX...
LAT...LON 44028760 43758746 43498751 43438780 43528823 43998868
44308875 44358815 44348807 44298798 44028760
MOST PROBABLE PEAK TORNADO INTENSITY...100-125 MPH
MOST PROBABLE PEAK WIND GUST...65-80 MPH
MOST PROBABLE PEAK HAIL SIZE...1.50-2.50 IN
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