Mesoscale Discussion 1286
NWS Storm Prediction Center Norman OK
0417 PM CDT Wed Jul 14 2021
Areas affected...Central/northern Iowa
Concerning...Tornado Watch 378...
Valid 142117Z - 142215Z
The severe weather threat for Tornado Watch 378 continues.
SUMMARY...Two supercell thunderstorms in central Iowa have recently
had observed tornadoes reported. The mesoscale environment will
continue to favor supercells with an attendant tornado threat.
DISCUSSION...A supercell thunderstorm in Calhoun County has recently
had a tornado reported with it. A newer storm to the east in
Hamilton County has also shown supercell structure with a weak TDS
signature on the 0.5 degree KDMX 2109Z scan. These storms are
interacting favorably with outflow from a convective complex that
moved through the region earlier today. This favorable mesoscale
environment will continue to support supercell storms with tornadic
potential this afternoon.
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