Hail — Brown, Illinois

2018-12-01 · near Versailles, Brown, Illinois

Wider weather episode

By late morning much of the rain shifted north and east of forecast area allowing partial

clearing to destabilize the atmosphere. Steep lapse rates due to relatively cold mid level temperatures southeast of the upper level low combined with strong low-mid level wind shear due to an 80-kt mid level wind max southeast of the upper level low. This led to the development of isolated low topped supercells along the northward moving warm front and ahead of the eastward moving cold front. Eight tornadoes were surveyed over WFO LSX's forecast area.

View location on OpenStreetMap → (39.8848, -90.6566)

Source: NOAA Storm Events Database, event_id 788461. Narrative written by the NWS forecast office that issued the report.