Thunderstorm Wind, Ogle
- When
- May 20, 2:15 PM CST
- Where
- Ogle County
- Coordinates
- 41.980, -89.580
Tornadoes and Hail in Illinois, May 20, 1975
14 thunderstorm wind, 7 hail, 2 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
- 1
- Property damage
- $500,000
- Crop damage
- None recorded
- Events
- 23
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
14 thunderstorm wind, 7 hail, 2 tornado. Local standard time, as filed.
Hail, Cook
- When
- May 20, 2:55 PM CST
- Where
- Cook County
- Measured
- 1.75 in hail
- Coordinates
- 41.870, -87.850
Thunderstorm Wind, Winnebago
- When
- May 20, 3:42 PM CST
- Where
- Winnebago County
- Measured
- 61 kt (70 mph)
- Coordinates
- 42.200, -89.100
Tornado, Grundy
- When
- May 20, 3:50 PM CST
- Where
- Grundy County
- Rating
- F2
- Path length
- 2 mi
- Path width
- 50 yd
- Injuries
- 1 direct, 0 indirect
- Property damage
- $250,000
- Coordinates
- 41.200, -88.320
Thunderstorm Wind, Kankakee
- When
- May 20, 4:00 PM CST
- Where
- Kankakee County
- Coordinates
- 41.150, -88.180
Thunderstorm Wind, Livingston
- When
- May 20, 4:00 PM CST
- Where
- Livingston County
- Measured
- 75 kt (86 mph)
- Coordinates
- 41.080, -88.430
Thunderstorm Wind, Cook
- When
- May 20, 4:00 PM CST
- Where
- Cook County
- Measured
- 59 kt (68 mph)
- Coordinates
- 41.670, -87.630
Hail, Cook
- When
- May 20, 4:06 PM CST
- Where
- Cook County
- Measured
- 1 in hail
- Coordinates
- 41.800, -87.780
Thunderstorm Wind, Will
- When
- May 20, 4:15 PM CST
- Where
- Will County
- Coordinates
- 41.330, -88.050
Hail, Ogle
- When
- May 20, 4:20 PM CST
- Where
- Ogle County
- Measured
- 1.75 in hail
- Coordinates
- 42.130, -89.400
Thunderstorm Wind, McHenry
- When
- May 20, 4:20 PM CST
- Where
- McHenry County
- Coordinates
- 42.250, -88.600
Hail, McHenry
- When
- May 20, 4:54 PM CST
- Where
- McHenry County
- Measured
- 1.75 in hail
- Coordinates
- 42.230, -88.330
Hail, Cook
- When
- May 20, 4:58 PM CST
- Where
- Cook County
- Measured
- 1.5 in hail
- Coordinates
- 41.930, -87.820
Hail,
- When
- May 20, 5:00 PM CST
- Where
- County
- Measured
- 1.75 in hail
- Coordinates
- 42.180, -87.780
Thunderstorm Wind, Cook
- When
- May 20, 5:00 PM CST
- Where
- Cook County
- Coordinates
- 42.170, -87.770
Hail, Will
- When
- May 20, 5:06 PM CST
- Where
- Will County
- Measured
- 0.75 in hail
- Coordinates
- 41.520, -88.180
Thunderstorm Wind, Rock Island
- When
- May 20, 5:15 PM CST
- Where
- Rock Island County
- Measured
- 61 kt (70 mph)
- Coordinates
- 41.380, -90.770
Thunderstorm Wind, Mercer
- When
- May 20, 5:20 PM CST
- Where
- Mercer County
- Coordinates
- 41.100, -90.930
Thunderstorm Wind, Mercer
- When
- May 20, 5:36 PM CST
- Where
- Mercer County
- Measured
- 52 kt (60 mph)
- Coordinates
- 41.300, -90.430
Thunderstorm Wind, Whiteside
- When
- May 20, 6:25 PM CST
- Where
- Whiteside County
- Measured
- 65 kt (75 mph)
- Coordinates
- 41.820, -89.970
Tornado, Greene
- When
- May 20, 10:30 PM CST
- Where
- Greene County
- Rating
- F2
- Path width
- 33 yd
- Property damage
- $250,000
- Coordinates
- 39.480, -90.400
Thunderstorm Wind, Morgan
- When
- May 20, 11:00 PM CST
- Where
- Morgan County
- Coordinates
- 39.730, -90.230
Thunderstorm Wind, Fulton
- When
- May 20, 11:30 PM CST
- Where
- Fulton County
- Measured
- 52 kt (60 mph)
- Coordinates
- 40.230, -90.350
What these are
- 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.
- 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.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Tornadoes and Hail in Michigan, May 20, 1975
- Tornado and Hail in Arkansas, May 20, 1975
- Tornado and Damaging Winds in Iowa, May 20, 1975
- Hail and Damaging Winds in Missouri, May 20, 1975
- Tornado and Hail in Texas, May 20, 1975
- Hail and Damaging Winds in Minnesota, May 20, 1975
- Hail and Damaging Wind in Maine, May 20, 1975
- Hail and Damaging Wind in Indiana, May 20, 1975
- Hail in Oklahoma, May 20, 1975
More
Every storm in Illinois in 1975Every state in 1975This day in weather historyThe tornado archive for Illinois, 1975
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: 10006729, 10006730, 10006731, 10006732, 10006733, 10006734, 10006735, 10006736, 10006737, 10006738, 10006739, 10006740, 10006741, 10006742, 10006743, 10006744, 10006745, 10006746, 10006747, 10006748, 10006749, 10006750, 10006751.