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7/15/2024 - Nasty storms possible in Iowa

Colonoscopy

HB Legend
Feb 20, 2022
12,666
13,512
113
52
Saint Louis, Mo
Looking like Eastern Iowa. Exact evolution unclear, but may pop off as early as 11am towards Highway 20 east of 35. May matriculate south towards I-80 region by mid afternoon.

All modes of severe possible, but bowing line segments and severe wind favored. Tornadoes may be possible too. Extreme instability environment, so always possible something significant happens.

(could also be a bunch of 60mph severe gusts and torrential rain)
 
Environmental conditions are supportive of damaging winds,
potentially significant (75+ mph) with the strongest storms, due
to the aforementioned very unstable air mass (MUCAPE 3500-4500
J/kg per HREF), sufficient deep layer shear, and presence of
steep mid- level lapse rates of 8-8.5 C/km as an elevated mixed
layer overspreads the region from the west. A few tornadoes are
possible in association with any surging storm segments as 0-3
km shear near 30 kts supports development of mesovortices.

Greatest uncertainty is on the exact timing of storms with some
CAMs showing an earlier mid afternoon to early evening event,
and others holding off until the evening into Monday night.
 
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