Thunderstorm Wind — Audrain, Missouri

2021-07-09 · near Laddonia, Audrain, Missouri

Event narrative

Widespread wind damage between Laddonia, Rush Hill and Mexico. One tree was blown down onto Route KK just west of Highway 19. Another tree was blown down onto Route B at 6th Street in Rush Hill. A two foot diameter tree was blown over onto Central Street in Mexico. Also, numerous tree limbs, power lines and power poles were blown over.

Wider weather episode

On the evening of July 9th, intense thunderstorms developed rapidly along a warm front draped from northwest to southeast across the area. There were two rounds of thunderstorms, the first being discrete, rotating storms called supercells. These supercell thunderstorms dropped large hail across portions of western Illinois (Mt. Sterling area) and also across the western St. Louis metro area. Hail in excess of 2 inches was noted in both of these supercells. Over time, the storms congealed into a large complex of thunderstorms known as a mesoscale convective complex (MCC). This line of storms contained damaging, sometimes destructive winds as they quickly pushed southeast across east-central Missouri into southwest Illinois. The worst damage was noted from Rensselaer, MO southward to Perry, MO, where straight-line winds of 90 mph were found. This same line of storms also affected the St. Louis metro area, bringing widespread 60-70 mph winds across the metro causing many large tree limbs to fall and many to be without power.

View location on OpenStreetMap → (39.2500, -91.6500)

Source: NOAA Storm Events Database, event_id 971801. Narrative written by the NWS forecast office that issued the report.