SPC MD 1452



MD 1452 CONCERNING SEVERE THUNDERSTORM WATCH 425…426… FOR PORTIONS OF CENTRAL/EASTERN IA INTO FAR NORTHWESTERN IL

MD 1452 Image


Mesoscale Discussion 1452
NWS Storm Prediction Center Norman OK
1214 PM CDT Mon Aug 10 2020

Areas affected...Portions of central/eastern IA into far
northwestern IL

Concerning...Severe Thunderstorm Watch 425...426...

Valid 101714Z - 101845Z

The severe weather threat for Severe Thunderstorm Watch 425, 426
continues.

SUMMARY...Widespread damaging winds of 70-100 mph are expected to
continue eastward across central/eastern Iowa over the next hour or
so. These winds will likely impact Cedar Rapids/Iowa City, and
eventually the Quad Cities area.

DISCUSSION...A small but potent bow echo will continue rapidly
eastward across eastern IA in the next hour or so. The apex of this
bow is moving eastward around 55-60 kt, and the potential for
widespread damaging winds remains apparent. A recent measured severe
wind gust of 99 mph was reported at the Marshalltown ASOS associated
with this bow, and a couple other gusts up to 100 mph have also been
noted. Current expectations are for this bow echo to maintain its
intensity across eastern IA, with 2500-3000 J/kg of MLCAPE present
downstream. A swath of 70-100+ mph wind gusts producing destructive
damage appears likely to impact the Cedar Rapids/Iowa City area
within the next hour, eventually reaching the Quad Cities area
around 1800-1830Z.

..Gleason.. 08/10/2020

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...DVN...DMX...

LAT...LON   41379283 41639275 41919282 42189284 42369259 42349125
            42129013 41709009 41339040 41219064 41219216 41379283 

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