Hail in Brown County, Illinois
Hail December 1, 2018 · Brown County, Illinois
Where the report was made, with tornadoes recorded within 15 miles over the years.
The wider storm
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.
Began near Versailles (39.8848, -90.6566).
Other tornadoes from the same storm system
8 more tornadoes the National Weather Service filed under this storm episode.
Source: NOAA Storm Events Database, event 788461. Narratives are written by the National Weather Service forecast office that issued the report.
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