1 hail, as filed by the National Weather Service.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The national radar mosaic for the moment the first event began.
1 hail. Local standard time, as filed.
A supercell thunderstorm entered southern Williamson County near the Lake of Egypt. Hail up to baseball size occurred on the north side of Lake of Egypt, near Hudgens. In the city of Marion, hail up to the size of quarters fell.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Illinois in 1999Every state in 1999This day in weather historyWarnings in Illinois, May 1999
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5694604.