Jul 25, 2020
A very anomalous moist atmosphere was in place for this flash flood event to develop. Precipitable water values (PWATs) were over 2 inches across southern Minnesota which is well over climatological normals. The 2.25 inches of precipitable water tallied from the 7 PM weather balloon launch at Chanhassen was just below record record levels for the day and was above the 95th percentile for this time of year. ||There were very subtle outflow boundaries during the afternoon from earlier thunderstorm
Source: NOAA National Weather Service Storm Events Database (event 907115). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Le Sueur County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.