FloodZoneMap.org

Flash Flood — Harrison, IA

Jun 12, 2024

On June 12th, a low-amplitude shortwave embedded in northwesterly flow aloft ejected out into the central Great Plains. At the surface, a surface low-pressure was noted in North Dakota with a cold front extending south into South Dakota. Ahead of this cold front, a surface trough extended from south-central Nebraska into northeast Nebraska. Isolated thunderstorms developed on this surface trough late in the afternoon across far northeast Nebraska. These storms quickly intensified and dove south-

Source: NOAA National Weather Service Storm Events Database (event 1198302). Narrative written by NWS staff at the time of the event.

Flood Risk Context for Harrison, IA

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

View Harrison County flood data →

More Flood Stories

Flash Flood$500K damage

Harrison, IA · May 12, 2023

A strong low-pressure system which had been moving slowly off the lee side of the Rocky Mountains had finally progressed into central Nebraska. This left western Iowa in the warm sector as a warm front moved north into the area.

Read the full account →
Flood$200K damage

Harrison, IA · Jun 24, 2024

A series of shortwave troughs traversing the northern CONUS brought unsettled weather to the area for the end of June. On the 21st, a stationary front was draped across northeast Nebraska into Iowa.

Read the full account →
Flood$2.2M damage

Harrison, IA · Mar 13, 2019

A 971mb bomb cyclone moved out of the central Rockies on Wednesday, March 13, 2019 and helped to create widespread, moderate to major, and in many cases historic, flooding across eastern Nebraska and western Iowa.

Read the full account →
Flood$7.0M damage

Harrison, IA · Aug 1, 2011

A record rain event in May in eastern Montana combined with high water from storms in April and May, plus snow melt from a much above normal snow pack, all contributed to bring record high water to the Missouri River chain of reservoirs by late Spring.

Read the full account →