1 flash flood, as filed by the National Weather Service.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
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 Quad Cities radar (KDVN), 58 km away, was scanning. The volume nearest the first event began at 19:02 UTC.
1 flash flood. Local standard time, as filed.
Unusually warm late January weather caused an early snowmelt along the Rock River in Northwest Illinois. As the river rose an ice jam developed along a tight bend in the river and forced water over portions of route 78 between Prophetstown and Lyndon.
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, February 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: 5684954.