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Flood — Polk, IA

May 30, 2008

Wet weather was the rule through most of May. However, a very welcome dry period at mid month finally allowed spring planting to progress. A statewide average of only 0.07 inches of rain fell between the afternoon of the 11th and the evening of the 22nd. The heaviest rains of the month arrived on the 29th-30th when a statewide average of 2.05 inches of rain fell. Flooding was widespread during this event from west central to northeast Iowa where 3 to 5 inch rain totals were common. Mon

Source: NOAA National Weather Service Storm Events Database (event 94287). Narrative written by NWS staff at the time of the event.

Flood Risk Context for Polk, IA

This event is one of many recorded floods in Polk County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.

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More Flood Stories

Flash Flood1 death$100K damage

Polk, IA · Aug 11, 2010

Once again the atmosphere over Iowa became very unstable during the peak heating of the day. CAPE rose to 3500-4500 J/kg by the mid to late afternoon with lifted indices of -8 to -10 C.

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Flash Flood1 death$1.0M damage

Polk, IA · Jun 30, 2018

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Flash Flood1 death$30K damage

Polk, IA · Feb 19, 1997

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Flash Flood$20K damage

Polk, IA · Jul 20, 2025

Diurnally driven afternoon storms on Sunday, July 20th, 2025, developed within an unstable environment with CAPE values over 3000 J/kg and 40 to 45 kts of effective shear.

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