952
ACUS11 KWNS 202134
SWOMCD
SPC MCD 202134
IAZ000-202330-
MESOSCALE DISCUSSION 1676
NWS STORM PREDICTION CENTER NORMAN OK
0434 PM CDT MON JUL 20 2026
AREAS AFFECTED...CENTRAL AND EASTERN IOWA
CONCERNING...TORNADO WATCH 500...
VALID 202134Z - 202330Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 500 CONTINUES.
SUMMARY...A CORRIDOR OF ENHANCED DAMAGING WIND POTENTIAL WITH GUSTS
OF 70-80 MPH APPEARS TO BE EVOLVING FROM THE WATERLOO VICINITY
TOWARDS IOWA CITY. A FEW TORNADOES AND ISOLATED OCCURRENCES OF LARGE
HAIL ARE ALSO POSSIBLE.
DISCUSSION...INITIAL MORE DISCRETE SUPERCELLS HAVE EVOLVED INTO A
BOWING COMPLEX WITH EMBEDDED HP SUPERCELLS NEAR AND SOUTHWEST OF
WATERLOO AS OF 2125Z. THE STORM COMPLEX IS LARGELY SITUATED ON THE
IMMEDIATE COOL SIDE OF A NORTH-SOUTH-ORIENTED OUTFLOW BOUNDARY
WITHIN A ZONE OF LOCALLY BACKED NEAR-SURFACE WINDS, WHICH ARE
ENHANCING BOTH LOW-LEVEL AND DEEP-LAYER SHEAR. EXTRAPOLATION OF
CURRENT STORM MOTION AND LATEST WOFS FORECASTS SUGGEST THAT A
CORRIDOR OF ENHANCED DAMAGING WIND POTENTIAL AND SOME TORNADO RISK
WILL SPREAD SOUTHEAST TOWARD IOWA CITY OVER THE NEXT 1-1.5 HOURS.
ISOLATED OCCURRENCES OF LARGE HAIL WILL ALSO BE POSSIBLE GIVEN THE
EMBEDDED SUPERCELL STRUCTURES.
..MEAD.. 07/20/2026
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT
ATTN...WFO...DVN...ARX...DMX...
LAT...LON 41199253 41769301 42289323 42669330 42899283 42869225
42269147 41559131 41169119 40909149 40949218 41199253
MOST PROBABLE PEAK TORNADO INTENSITY...120-145 MPH
MOST PROBABLE PEAK WIND GUST...65-80 MPH
MOST PROBABLE PEAK HAIL SIZE...1.50-2.50 IN
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