Feb 27, 2023
A large and unseasonably warm system brought showers and thunderstorms to the state. Over an inch of rain fell across much of Iowa. In northern Iowa, this was on top of a snowpack of two to four inches. The quick rain on top of frozen group resulted in runoff sufficient to send the Winnebago River at Mason City into minor river flooding. The river exceeded minor flood stage and quickly crested the morning of February 27th before falling back below flood stage the morning of February 28th.
Source: NOAA National Weather Service Storm Events Database (event 1081129). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Cerro Gordo County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.