Thunderstorm Wind — Johnson, Illinois

2024-08-15 · near Cypress, Johnson, Illinois

Event narrative

A powerful thunderstorm moving southeastward through SW Johnson County blew down a tree onto IL-37 and knocked down several trees and powerlines in Cypress.

Wider weather episode

Isolated late afternoon storms morphed into a fairly small mesoscale convective system that surged southeastward through Southwestern Illinois. MLCAPE was 3000 J/kg, decreasing to 2000 J/kg for the evening. Effective bulk shear was 30 kts. A localized swath of significant wind damage occurred in portions of Southwestern Illinois with the most concentrated area of wind damage near Karnak. Other areas receiving wind damage were Gorham, Dongola, Cypress, and Joppa.

View location on OpenStreetMap → (37.3565, -89.0115)

Source: NOAA Storm Events Database, event_id 1209009. Narrative written by the NWS forecast office that issued the report.