Jun 20, 2018
Without even looking at supporting variables, the setup for impactful weather could be gleaned from the general setup. A weak surface pressure system was slowly working its way across Iowa, situating its relevant boundaries primarily across southwest and southern Iowa. Within the warm sector, dew points were high in the low to mid 70s, especially considering afternoon air temperatures were only into the low 80s. Even north of the warm front and west of the cold front, the air mass was ripe for a
Source: NOAA National Weather Service Storm Events Database (event 763649). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Humboldt County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.