Tornado, Rock Island
- When
- August 20, 12:25 AM CST
- Where
- Rock Island County
- Rating
- F1
- Path length
- 1 mi
- Path width
- 50 yd
- Property damage
- $250,000
- Coordinates
- 41.430, -90.720
Tornado and Hail in Illinois, August 20, 1979
4 thunderstorm wind, 2 hail, 1 tornado, as filed by the National Weather Service.
Where it happened
Every event with a place to put it. Tap one for its entry below.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- $250,000
- Crop damage
- None recorded
- Events
- 7
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.
Event by event
4 thunderstorm wind, 2 hail, 1 tornado. Local standard time, as filed.
Thunderstorm Wind, Madison
- When
- August 20, 5:05 PM CST
- Where
- Madison County
- Coordinates
- 38.800, -89.830
Thunderstorm Wind, Clark
- When
- August 20, 5:10 PM CST
- Where
- Clark County
- Coordinates
- 39.480, -87.680
Hail, Champaign
- When
- August 20, 5:15 PM CST
- Where
- Champaign County
- Measured
- 1 in hail
- Coordinates
- 40.030, -87.970
Thunderstorm Wind, Edgar
- When
- August 20, 5:20 PM CST
- Where
- Edgar County
- Coordinates
- 39.580, -87.700
Thunderstorm Wind, Madison
- When
- August 20, 5:30 PM CST
- Where
- Madison County
- Coordinates
- 38.670, -90.000
Hail, Bond
- When
- August 20, 5:40 PM CST
- Where
- Bond County
- Measured
- 0.75 in hail
- Coordinates
- 38.880, -89.570
What these are
- Tornado
- A violently rotating column of air in contact with the ground and extending from a thunderstorm, filed with its path, width and Fujita or Enhanced Fujita rating from the damage survey.
- Thunderstorm Wind
- Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
- Hail
- Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Tornado and Hail in Texas, August 20, 1979
- Tornadoes and Hail in Nebraska, August 20, 1979
- Hail and Damaging Winds in Indiana, August 20, 1979
- Hail and Damaging Winds in Kentucky, August 20, 1979
- Damaging Winds in Oklahoma, August 20, 1979
- Hail and Damaging Wind in Iowa, August 20, 1979
- Hail in New Mexico, August 20, 1979
- Hail in North Carolina, August 20, 1979
- Damaging Wind in Louisiana, August 20, 1979
- Hail in Missouri, August 20, 1979
- Damaging Wind in Virginia, August 20, 1979
- Damaging Wind in Nevada, August 20, 1979
More
Every storm in Illinois in 1979Every state in 1979This day in weather historyThe tornado archive for Illinois, 1979
Sources
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: 10007098, 10007099, 10007100, 10007101, 10007102, 10007103, 10007104.