Tornadoes · United States · Illinois · 1967

F1 tornado, Winnebago County, Illinois, June 11, 1967

This F1 tornado ran 0.1 miles across Winnebago County on June 11, 1967, touching down at 2:20 PM GMT-5 and reaching 10 yards wide. It killed nobody, and did $5,000 to $50,000 of property damage.

The rating scale

Tracks are drawn in the color of the rating. The Fujita scale rates the damage rather than measuring the wind: the speeds are what that damage is taken to imply.

  1. F040 to 72 mph

    Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.

  2. F173 to 112 mphthis tornado

    Moderate damage. Roofs badly stripped, mobile homes overturned or badly damaged, exterior doors lost, windows broken.

  3. F2113 to 157 mph

    Considerable damage. Roofs torn off well-built houses, frame homes shifted on their foundations, mobile homes destroyed, large trees snapped or uprooted, cars lifted off the ground.

  4. F3158 to 206 mph

    Severe damage. Whole stories of well-built houses destroyed, large buildings badly damaged, trains overturned, trees debarked, heavy cars lifted and thrown.

  5. F4207 to 260 mph

    Devastating damage. Well-built houses leveled, structures with weak foundations moved some distance, cars thrown and large missiles generated.

  6. F5261 to 318 mph

    Incredible damage. Strong frame houses swept off their foundations, car-sized missiles thrown more than 100 meters, steel-reinforced concrete badly damaged, high-rise buildings deformed.

  7. Unrated

    The survey recorded a tornado but could not put a number on it, most often because it crossed open country and damaged nothing a rating can be read from.

The record

Rating
F1, estimated from the damage record rather than surveyed
Date
June 11, 1967
Touchdown
2:20 PM GMT-5 (19:20 UTC)
Path length
0.1 miles (0.2 km)
Path width
10 yards (9 m)
Deaths
0
Injuries
0
Property damage
$5,000 to $50,000
County
Winnebago County
Touchdown point
42.200, -89.000
Record number
441

The air that afternoon

The radiosonde launches on either side of the tornado, from the nearest station that was launching then, drawn and analyzed the way Storm Lab does: the same diagram, the same parcel and shear definitions SPC's mesoanalysis uses.

Peoria Regional, IL (KPIA), 12:00Z

7.3 hours before the tornado, 177 km from the path. June 11, 1967.

Skew-T log-pSkew-T log-p diagram, Peoria Regional, IL at 12:00Z on 1967-06-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 151 joules per kilogram, CIN -157, lifted condensation level 1006 meters above ground. Wind barbs in knots down the right edge.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed. The warm shading is its CAPE, the cool shading the inhibition it has to break through.
HodographHodograph, Peoria Regional, IL at 12:00Z on 1967-06-11The wind through the lowest 10 kilometers as a curve, rings every 10 meters per second labeled in knots. Zero to 1 km storm-relative helicity 39 square meters per square second, 0 to 6 km bulk shear 16 knots.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km. RM and LM are the right and left moving storms Bunkers' method gives; the shaded area is the 0 to 1 km storm-relative helicity.
Mixed-layer CAPE
151 J/kg
Mixed-layer CIN
-157 J/kg
Surface CAPE
35 J/kg
Mixed-layer LCL
1006 m above ground
0-6 km bulk shear
16 kt
0-1 km bulk shear
25 kt
0-1 km storm-relative helicity
39 m²/s²
0-3 km storm-relative helicity
2 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3
0-3 km lapse rate
5.2 K/km

Open this sounding in Storm Lab

Peoria Regional, IL (KPIA), 00:00Z

4.7 hours after it, 177 km from the path. June 12, 1967.

Skew-T log-pSkew-T log-p diagram, Peoria Regional, IL at 00:00Z on 1967-06-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 144 joules per kilogram, CIN -26, lifted condensation level 1623 meters above ground. Wind barbs in knots down the right edge.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed. The warm shading is its CAPE, the cool shading the inhibition it has to break through.
HodographHodograph, Peoria Regional, IL at 00:00Z on 1967-06-12The wind through the lowest 10 kilometers as a curve, rings every 10 meters per second labeled in knots. Zero to 1 km storm-relative helicity 28 square meters per square second, 0 to 6 km bulk shear 21 knots.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km. RM and LM are the right and left moving storms Bunkers' method gives; the shaded area is the 0 to 1 km storm-relative helicity.
Mixed-layer CAPE
144 J/kg
Mixed-layer CIN
-26 J/kg
Surface CAPE
1249 J/kg
Mixed-layer LCL
1623 m above ground
0-6 km bulk shear
21 kt
0-1 km bulk shear
8 kt
0-1 km storm-relative helicity
28 m²/s²
0-3 km storm-relative helicity
84 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2
0-3 km lapse rate
6.9 K/km

Open this sounding in Storm Lab

This ground now

The live radar over the trackEvery 1967 tornado in IllinoisEvery tornado in Illinois since 1950Warnings in force in Illinois nowThe forecast where you are

The other tornadoes of June 11, 1967

21 more were confirmed in the United States that day.

DateTimeRatingWherePath (mi)Width (yd)DeathsInjuriesDamage
June 111:32 AM GMT-5F1Nowata, OK0.110
June 112:36 AM GMT-5F0Ottawa, OK0.110
June 111:20 PM GMT-5F2Jo Daviess, IL4.3500$50,000 to $500,000
June 113:00 PM GMT-5F2Dane, WI1.310$50,000 to $500,000
June 112:30 PM GMT-6F0Cheyenne, CO0.110
June 113:30 PM GMT-5F1Lafayette, WI0.550$5,000 to $50,000
June 114:35 PM GMT-5F0Webster, NE0.110
June 114:45 PM GMT-5F0Adams, NE0.110
June 115:00 PM GMT-5F1Webster, NE0.110$500 to $5,000
June 115:20 PM GMT-5F0Berrien, MI0.110
June 116:00 PM GMT-5F2McLennan, TX1.0100$5,000 to $50,000
June 116:05 PM GMT-5F0Pottawatomie, OK0.510
June 116:25 PM GMT-5F1Wabaunsee, KS24.710$50,000 to $500,000
June 117:00 PM GMT-5F3Shawnee, KS43.910$50,000 to $500,000
June 117:30 PM GMT-5F2Navarro, TX0.150$500 to $5,000
June 117:45 PM GMT-5F0Lincoln, OK0.110
June 117:45 PM GMT-5F1Lincoln, OK0.110
June 117:55 PM GMT-5F0Lincoln, OK0.350$5,000 to $50,000
June 117:55 PM GMT-5F2Lincoln, OK0.110under $50
June 118:35 PM GMT-5F2Barber, KS32.210$50,000 to $500,000
June 119:00 PM GMT-5F1Reno, KS14.010$50,000 to $500,000

What this means

Ratings are the survey's, read off the damage rather than measured; the rating scale is above. Tornado counts rise through the record as reporting improved, so a year in the 1950s is not comparable with one today except for the strongest tornadoes, which were always noticed.

Sources

NOAA Storm Prediction Center tornado database, 1950-2025, the official record kept by NOAA's Storm Prediction Center.