EFU Tornado — Madison, Iowa

2024-04-26 · near Patterson, Madison, Iowa

Event narrative

Storm chaser captured video of this tornado as it travelled just south of Patterson in Madison County. High resolution satellite imagery also helped define the path of this tornado as it stayed in rural areas. This tornado did not impact any damage indicators, hence the EFU rating.

Wider weather episode

Multiple rounds of storms moved across the area on April 26th. The first round was fueled by broad thermal lift and passed across Iowa through the morning with a few of these storms producing small hail but all remained sub severe. The area dried out and cleared out behind this round, allowing for a few hours of destabilization. By afternoon the warm sector was sufficiently unstable between the warm front and a dryline. Robust convection developed along that dryline in the afternoon in western Nebraska, moving into Iowa in the early evening. With sufficient instability, the increasing low level jet, and SRH exceeding 300 m2/s2, large hail and tornadoes occurred with storms across western to central Iowa. In all, 28 tornadoes occurred in Iowa with 18 within the NWS Des Moines area.

View location on OpenStreetMap → (41.3360, -93.8998)

Source: NOAA Storm Events Database, event_id 1170073. Narrative written by the NWS forecast office that issued the report.