May 9, 1998
A rather chaotic but weak upper level flow was over Iowa. The air mass became unstable during the late afternoon as temperatures warmed in to the mid 70s. Thunderstorms erupted and moved very slowly west. One of the storms remained nearly stationary over Pocahontas County. One and one half inches of rain fell in 45 minutes in Pocahontas, with 2.75 inches in a 90 minute period. The heavy rain caused some urban flooding in the county, however it was not widespread.
Source: NOAA National Weather Service Storm Events Database (event 5646503). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Pocahontas County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.