Thunderstorm Wind — Cass, Illinois

2021-08-08 · near Virginia, Cass, Illinois

52 EG

Magnitude

Event narrative

A large pecan tree branch was blown onto a roof, causing damage to the roof.

Wider weather episode

An outflow boundary from previous convection triggered several clusters of strong thunderstorms across north-central Illinois during the late afternoon and evening of August 8th. Thanks to copious atmospheric moisture and the slow-movement of the storms, very heavy rainfall of 6 to 8 inches was observed across northwestern McLean County...including 8.25 in the town of Danvers. As a result, significant flash flooding occurred from Danvers to Carlock just northwest of Bloomington-Normal. In addition, a Mesoscale Convective Vortex (MCV) generated by convection earlier in the day across the Plains tracked into west-central Illinois, triggering scattered severe thunderstorms along and west of the Illinois River. Isolated wind damage occurred with these cells.

View location on OpenStreetMap → (39.9500, -90.2200)

Source: NOAA Storm Events Database, event_id 978264. Narrative written by the NWS forecast office that issued the report.