Tornadoes · United States · Minnesota · 2015

EF0 tornado, Oshawa to Traverse, Minnesota, June 22, 2015

Name: EF0 tornado, Oshawa to Traverse, Minnesota, June 22, 2015
Start: 2015-06-22T11:50:00.000Z
End: 2015-06-22T11:54:00.000Z
Location: Oshawa to Traverse, Minnesota

From Oshawa to Traverse, this EF0 tornado ran 2.8 miles across Nicollet County on June 22, 2015, touching down at 6:50 AM CDT and reaching 50 yards wide. It killed nobody.

The rating scale

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

EF065 to 85 mphthis tornado
Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.
EF186 to 110 mph
Moderate damage. Roofs badly stripped, mobile homes overturned or badly damaged, exterior doors lost, windows broken.
EF2111 to 135 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.
EF3136 to 165 mph
Severe damage. Whole stories of well-built houses destroyed, large buildings badly damaged, trains overturned, trees debarked, heavy cars lifted and thrown.
EF4166 to 200 mph
Devastating damage. Well-built houses leveled, structures with weak foundations moved some distance, cars thrown and large missiles generated.
EF5over 200 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.
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: EF0
Date: June 22, 2015
Touchdown: 6:50 AM CDT (11:50 UTC)
Lifted: 6:54 AM CDT (11:54 UTC)
On the ground: 4 minutes
Path length: 2.8 miles (4.5 km)
Path width: 50 yards (46 m)
Deaths: 0
Injuries: 0
County: Nicollet County
Touchdown point: 44.313, -94.082
Lift-off point: 44.349, -94.060
Record number: 1506220550-01

The damage survey

5 damage points were recorded along this path by NWS MPX, in the Damage Assessment Toolkit the survey teams carry. The strongest indicator was rated EF0. The highest wind the damage implies is 73 mph.

Some crop damage. End of tornado occurred shortly thereafter.

Survey points are preliminary and are the raw material the published rating was built from. Source: NWS Damage Assessment Toolkit.

What the Weather Service recorded

During the early morning hours of Monday, June 22nd, a complex of thunderstorms (classified by some as a weak derecho event) developed across western South Dakota and moved rapidly eastward into southwest Minnesota before daybreak. Several bow-echo segments and a few isolated storms ahead of the main thunderstorm complex affected a large area along and south of the Minnesota River Valley, and in the southern suburbs of the Twin Cities between 4 am and 6 am LST. ||Initially, a line of thunderstorms that bowed out in far southern Minnesota, caused numerous downed trees, power lines, and some structural damage to outbuildings and homes as winds of 60 to 70 mph moved across the area between 4 am and 6 am LST. ||There were isolated severe storms that developed ahead of the main line and moved northeast across south central and into the southern suburbs of the Twin Cities. Golf ball size hail was reported west of Lakeville before sunrise.

The tornado mostly crossed corn and bean fields, but it did originate near a freshly cut alfalfa field. The alfalfa was easily blown and resulted in a debris signature on radar. The tornado produced very minor damage at a few farmsteads, and knocked down several dozen trees along with breaking many large branches. The tornado was also photographed by a local resident.

From NOAA NCEI's Storm Events Database, the narrative the local forecast office wrote for Storm Data.

What forecasters said that day

The local office's own words before the tornado touched down, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Twin Cities, MN wrote its last area forecast discussion before the tornado touched down at Jun 22, 2:40 AM CDT, 4 hours 10 minutes earlier.

Area forecast discussion, Jun 22, 2:40 AM CDT, 4 hours 10 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
240 AM CDT MON JUN 22 2015

.SHORT TERM...(TODAY AND TONIGHT)
ISSUED AT 238 AM CDT MON JUN 22 2015

THE EVOLUTION OF THE LINEAR MCS IS THE PRIMARY CONCERN TODAY. DO
EXPECT A WEAKENING TREND AS THE LINE MOVES EASTWARD...AND THEN THE
QUESTION BECOMES WHERE THE RELATED BOUNDARY WILL RESIDE THIS
AFTERNOON. HAVE INCLUDED EARLY TO MID AFTERNOON CHANCE POPS FROM
ALBERT LEA TO EAU CLAIRE...ALTHOUGH WILL NEED TO REASSESS AFTER IT
BECOMES MORE CLEAR WHERE THE BOUNDARY SETS UP IN THE WAKE OF THE
NOCTURNAL MCS. WITH PLENTY OF DEEP LAYER SHEAR AND MLCAPE TO WORK
WITH...SUPERCELLS AND THE KITCHEN SINK OF SEVERE WEATHER TYPES WOULD
BE POSSIBLE...PRIMARILY BETWEEN 18Z AND 21Z FROM KAEL TO KEAU AND
SOUTH/SOUTHEAST. HOWEVER...THERE IS A DECENT CHANCE IT WILL BE
SHUNTED TO THE SOUTH/EAST OF THE AREA...SO CONFIDENCE IS LOW.

.LONG TERM...(TUESDAY THROUGH SUNDAY)
ISSUED AT 238 AM CDT MON JUN 22 2015

LITTLE CHANGE WAS MADE IN THE LONG TERM PORTION OF THE
FORECAST. GENERALLY SPEAKING...FOLLOWING THIS MORNINGS STORM SYSTEM
WE SHOULD TRANSITION TO A DRIER REGIME WITH ZONAL TO NORTHWEST FLOW.
A FEW SHORTWAVES WITHIN THIS NORTHWEST FLOW WILL BRING SLIGHT
CHANCES FOR SHOWERS AND THUNDERSTORMS...SPECIFICALLY WEDNESDAY AND
FRIDAY/NIGHT. TEMPERATURES WILL NEAR TO SLIGHTLY BELOW THE SEASONAL
AVERAGE FOR LATE JUNE.

AT THE START OF THE PERIOD TUESDAY MORNING ANTICYCLONIC FLOW AND
SUBTLE HEIGHT RISES WILL LEAD TO SUBSIDENCE AND SURFACE HIGH
PRESSURE ACROSS THE UPPER MIDWEST. FORECAST SOUNDINGS SHOW THE
POTENTIAL FOR A FEW AFTERNOON CLOUDS...WITH WEST SOUTHWESTERLY WINDS
AROUND 10 MPH. SO ALL THINGS CONSIDERED...A VERY SEASONABLE SUMMER
DAY. ON WEDNESDAY A SHORTWAVE WILL MOVE JUST SOUTH OF THE
INTERNATIONAL BORDER AND BRING A CHANCE FOR A FEW SHOWERS AND
THUNDERSTORMS. LOW LEVEL MOISTURE RETURN AHEAD OF THIS WAVE WILL
LIFT NORTHWARD...BUT SHOULD REMAIN NEAR AND SOUTH OF I-90. THEREFORE
THINK THE BEST CHANCES FOR PRECIP WILL BE ACROSS THE NORTH TIED TO
THE UPPER LEVEL FORCING...AND ALSO TO THE SOUTH ALONG THE WARM
FRONT. IT LOOKS LIKE THESE TWO AREAS OF PRECIP COULD SPLIT CENTRAL
MN/WI. FORECAST SOUNDINGS HAVE THE BEST ELEVATED MIXED LAYER AND
INSTABILITY TO THE SOUTH...SO COULD SEE SUPERCELLS AND SEVERE
WEATHER GIVEN THE FAVORABLE KEEP LAYER SHEAR PROFILE.

FOR THE REST OF THE WEEK A FEW SHORTWAVES BRING CHANCES FOR SHOWERS
AND THUNDERSTORMS. THE BEST SIGNAL AFTER WEDNESDAY/NIGHT IS FRIDAY
INTO SATURDAY. TAKING A QUICK GLANCE AT THE FINISHED FORECAST...IT
MAY SEEM LIKE SHOWERS AND THUNDERSTORMS WILL MAKE FOR A WET
WEEK...BUT JUST TO REITERATE THAT ASIDE FROM WEDNESDAY/NIGHT...THE
MOISTURE IS LIMITED WITH THE NORTHWEST FLOW AS PWATS GENERALLY
REMAIN LESS THAN AN INCH...WHICH IS NEAR THE CLIMATOLOGICAL AVERAGE.

&&

.AVIATION...(FOR THE 06Z TAFS THROUGH 06Z MONDAY NIGHT)
ISSUED AT 1150 PM CDT SUN JUN 21 2015

CURRENT RADAR TRENDS AND LOCAL MODELS DEPICT TWO AREAS OF
SHRA/TSRA DEVELOPING ACROSS WC/CENTRAL/SC MN BY 7-9Z...AND EC MN
BY 10-12Z. HIGH CONFIDENCE IN A SQUALL LINE MOVING ACROSS PARTS OF
SOUTHERN MN BY SUNRISE. THERE IS ALSO AN INDICATION OF SIGNIFICANT
STRONG EASTERLY OUTFLOW FROM THE THUNDERSTORM COMPLEX ONCE IT
MOVES OFF TO THE EAST BY 15Z. SOME ADJUSTMENTS WILL BE NEEDED
OVERNIGHT...BUT THERE WILL BE A PERIOD OF HEAVY RAINFALL AND
STRONG WINDS ON THE INITIAL TSRA COMPLEX. SOME MVFR CIGS ARE
POSSIBLE BEHIND THIS SYSTEM...WITH BREEZY WNW/NW WINDS DEVELOPING
BY THE AFTN.

KMSP...

SAME SCENARIO AS BEFORE AS A COMPLEX OF TSRA MOVES ACROSS THE
AIRPORT FIELD BETWEEN 12-14Z. SCATTERED TSRA ARE POSSIBLE BEFORE
12Z...BUT THE MAIN STORM WILL OCCUR AROUND 13Z. CONFIDENCE IS
INCREASING ON GUSTY WINDS ALONG AND BEHIND THIS TSRA COMPLEX. MVFR
CIGS IN THE MORNING WILL GIVE AWAY TO VFR AND GUSTY WNW WINDS BY
THE AFTN.

/OUTLOOK FOR KMSP/

TUE...VFR. WINDS NW TO W AT 5-10 KT.
WED...VFR. CHC OF TSRA. WINDS SE 5 KTS.
THU...VFR. WINDS N 5-10 KTS.

&&

.MPX WATCHES/WARNINGS/ADVISORIES...
MN...NONE.
WI...NONE.
&&

SHORT TERM...LS
LONG TERM...JRB
AVIATION...JLT

Hazardous weather outlook, Jun 22, 4:49 AM CDT, 2 hours 1 minute before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
449 AM CDT MON JUN 22 2015

MNZ041>045-047>070-073>078-082>085-091>093-WIZ014>016-023>028-
231000-
DOUGLAS-TODD-MORRISON-MILLE LACS-KANABEC-STEVENS-POPE-STEARNS-
BENTON-SHERBURNE-ISANTI-CHISAGO-LAC QUI PARLE-SWIFT-CHIPPEWA-
KANDIYOHI-MEEKER-WRIGHT-HENNEPIN-ANOKA-RAMSEY-WASHINGTON-
YELLOW MEDICINE-RENVILLE-MCLEOD-SIBLEY-CARVER-SCOTT-DAKOTA-
REDWOOD-BROWN-NICOLLET-LE SUEUR-RICE-GOODHUE-WATONWAN-BLUE EARTH-
WASECA-STEELE-MARTIN-FARIBAULT-FREEBORN-POLK-BARRON-RUSK-
ST. CROIX-PIERCE-DUNN-PEPIN-EAU CLAIRE-
449 AM CDT MON JUN 22 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL AND
SOUTHERN MINNESOTA... AND WEST CENTRAL WISCONSIN.

.DAY ONE...TODAY AND TONIGHT

TWO ROUNDS OF THUNDERSTORMS ARE EXPECTED TODAY.

THE FIRST WILL BE THIS MORNING. A COMPLEX OF STORMS WILL TRACK
ACROSS SOUTHERN MINNESOTA AND WILL HAVE THE POTENTIAL TO CREATE
WIND GUSTS IN EXCESS OF 70 MPH. SCATTERED STORMS OUT AHEAD OF THE
MAIN LINE COULD BECOME SEVERE AS WELL...WITH LARGE HAIL BEING THE
MAIN THREAT FROM STRONGER CELLS THAT DEVELOP AHEAD OF THE LINE.
THIS LINE OF STORMS WILL MOVE OUT OF THE OUTLOOK AREA BY 10 AM.

BEHIND THE MORNING LINE...A SECOND ROUND OF THUNDERSTORMS WILL BE
POSSIBLE FROM THE LATE MORNING THROUGH THE EARLY AFTERNOON FROM
EAST CENTRAL MINNESOTA INTO WEST CENTRAL WISCONSIN. A FEW OF THESE
STORMS COULD BE SEVERE AS WELL...WITH DAMAGING WIND GUSTS AND
LARGE HAIL BEING THE PRIMARY THREAT.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THUNDERSTORMS ARE POSSIBLE AGAIN PERIODICALLY FROM WEDNESDAY INTO
THE UPCOMING WEEKEND. AT THIS TIME...THE THREAT FOR SEVERE WEATHER
APPEARS LOW FOR THE LAST HALF OF THE WEEK.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTER ACTIVATION WILL LIKELY BE NEEDED.

In the hours before

Special weather statement, Jun 22, 5:10 AM CDT, 1 hour 40 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
510 AM CDT MON JUN 22 2015

MNZ083>085-092-093-221100-
FARIBAULT-WASECA-BLUE EARTH-FREEBORN-STEELE-
510 AM CDT MON JUN 22 2015

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT STEELE...SOUTHEASTERN
BLUE EARTH...NORTHEASTERN FARIBAULT...FREEBORN AND WASECA COUNTIES...

AT 509 AM CDT...A LINE OF STRONG THUNDERSTORMS WAS ALONG A LINE
EXTENDING FROM NEAR ALMA CITY TO AUSTIN...AND MOVING NORTHEAST AT 45
MPH.

WIND GUSTS OF 50 TO 55 MPH AND NICKEL SIZE HAIL ARE POSSIBLE WITH
THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
OWATONNA...ALBERT LEA...WASECA...JANESVILLE...BLOOMING PRAIRIE...
MAPLETON...NEW RICHLAND...ST. CLAIR...CLARKS GROVE...ELLENDALE...
MINNESOTA LAKE AND ALDEN.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 INTERSTATE 35 BETWEEN MILE MARKERS 1 AND 43.
 INTERSTATE 90 BETWEEN MILE MARKERS 146 AND 173.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 AM CDT FOR
SOUTH CENTRAL MINNESOTA.

LAT...LON 4397 9402 4419 9376 4420 9353 4404 9305
      4350 9305 4350 9335
TIME...MOT...LOC 1009Z 241DEG 39KT 4407 9371 4366 9298

LS

Special weather statement, Jun 22, 5:23 AM CDT, 1 hour 27 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
523 AM CDT MON JUN 22 2015

MNZ073-221215-
REDWOOD-
523 AM CDT MON JUN 22 2015

...VERY HEAVY RAIN AND LOCALIZED MINOR FLOODING EXPECTED...

VERY HEAVY RAIN WITH THE POTENTIAL FOR LOCALIZED FLOODING WILL AFFECT
THE FOLLOWING COUNTIES...

REDWOOD...

AT 517 AM CDT...VERY HEAVY RAIN WITH THE POTENTIAL FOR LOCALIZED
FLOODING WAS OVER PARTS OF REDWOOD COUNTY. 1 TO 3 INCHES OF RAIN
HAVE ALREADY FALLEN...WITH 1 TO 2 ADDITIONAL INCHES POSSIBLE.

LOCATIONS IMPACTED INCLUDE...
WALNUT GROVE...WABASSO...MILROY...LUCAN AND WANDA.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...AS WELL AS FARM AND COUNTRY ROADS. DO NOT
ATTEMPT TO TRAVEL ACROSS FLOODED ROADS. FIND ALTERNATE ROUTES.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

LAT...LON 4431 9559 4448 9559 4440 9513 4426 9512
      4423 9537 4419 9558 4421 9560
TIME...MOT...LOC 1017Z 240DEG 0KT 4436 9551

ADL

Local storm report, Jun 22, 5:48 AM CDT, 1 hour 2 minutes before

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Local storm report, Jun 22, 6:16 AM CDT, 34 minutes before

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Special weather statement, Jun 22, 6:20 AM CDT, 30 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
620 AM CDT MON JUN 22 2015

MNZ063-069-070-221145-
WASHINGTON-DAKOTA-SCOTT-
620 AM CDT MON JUN 22 2015

...A STRONG THUNDERSTORM WILL AFFECT WESTERN DAKOTA...SOUTHEASTERN
SCOTT AND SOUTHERN WASHINGTON COUNTIES...

AT 620 AM CDT...A STRONG THUNDERSTORM WAS OVER ELKO NEW MARKET...OR
11 MILES NORTHWEST OF NORTHFIELD...MOVING NORTHEAST AT 40 MPH.

WINDS IN EXCESS OF 40 MPH AND NICKEL SIZE HAIL ARE POSSIBLE WITH THIS
STORM.

LOCATIONS IMPACTED INCLUDE...
BLOOMINGTON...EAGAN...WOODBURY...BURNSVILLE...LAKEVILLE...APPLE
VALLEY...COTTAGE GROVE...INVER GROVE HEIGHTS...SAVAGE...ROSEMOUNT...
FARMINGTON AND SOUTH ST. PAUL.

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 75 AND 88.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 AM CDT FOR
SOUTHEASTERN MINNESOTA. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN
EFFECT UNTIL 1000 AM CDT FOR WEST CENTRAL WISCONSIN.

LAT...LON 4448 9328 4454 9328 4454 9339 4458 9345
      4481 9328 4484 9321 4487 9320 4489 9318
      4486 9276 4447 9326
TIME...MOT...LOC 1120Z 220DEG 34KT 4459 9329

JRB

Local storm report, Jun 22, 6:32 AM CDT, 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
632 AM CDT MON JUN 22 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0626 AM     HAIL             LAKEVILLE               44.65N 93.25W
06/22/2015  E0.88 INCH       DAKOTA             MN   PUBLIC

            REPORTED VIA TWITTER.

&&

ADL

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.

Minneapolis, MN (KMPX), 00:00Z

11.8 hours before the tornado, 69 km from the path. June 22, 2015.

Skew-T log-p

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.

Hodograph

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: 10 J/kg
Mixed-layer CIN: -11 J/kg
Surface CAPE: 251 J/kg
Mixed-layer LCL: 2425 m above ground
0-6 km bulk shear: 40 kt
0-1 km bulk shear: 6 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 97 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1
0-3 km lapse rate: 9.2 K/km

Open this sounding in Storm Lab

Minneapolis, MN (KMPX), 12:00Z

0.2 hours after it, 69 km from the path. June 22, 2015.

Skew-T log-p

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.

Hodograph

Mixed-layer CAPE: 156 J/kg
Mixed-layer CIN: -219 J/kg
Surface CAPE: 170 J/kg
Mixed-layer LCL: 1177 m above ground
0-6 km bulk shear: 51 kt
0-1 km bulk shear: 22 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 126 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0
0-3 km lapse rate: 5.0 K/km

Open this sounding in Storm Lab

The surface observations

Mankato (MKT), 17 km from the path, in the two hours either side.

Time (UTC)	Temp (°F)	Dew point (°F)	Wind	Gust (kt)	Pressure (mb)	Weather
00:00 UTC

From the Iowa Environmental Mesonet's archive of airport observations.

The radar

The Minneapolis radar (KMPX), 70 km away, was scanning. The volume nearest the touchdown began at 11:51 UTC.

Open the radar archive at this moment, over the track

Reflectivity and velocity, decoded from the Level II archive in the browser. Volumes take a few seconds to open the first time.

This ground now

The live radar over the track Every 2015 tornado in Minnesota Every tornado in Minnesota since 1950 Warnings in force in Minnesota now The forecast where you are

The other tornadoes of June 22, 2015

26 more were confirmed in the United States that day.

Date	Time	Rating	Where	Path (mi)	Width (yd)	Injuries	Damage
June 22	2:26 AM CDT	EF1	Mahnomen, MN	0.2	30
June 22	8:21 AM CDT	EF1	Fayette, IA	1.5	50	2	$100,000
June 22	8:50 AM CDT	EF0	Crawford, WI	1.3	35		$10,000
June 22	9:06 AM CDT	EF0	Crawford, WI	7.4	60		$34,000
June 22	2:30 PM EDT	EF1	Ionia, MI	4.6	100	5	$3.2 million
June 22	5:05 PM CDT	EF3	Marion, IA	11.1	575		$150,000
June 22	5:50 PM CDT	EF2	Monroe, IA	1.7	290		$125,000
June 22	7:14 PM EDT	EF0	Charlotte, FL	0.6	15
June 22	7:08 PM CDT	EF0	Gray, KS	0.6	50
June 22	7:14 PM CDT	EF1	Whiteside, IL	2.2	75
June 22	7:15 PM CDT	EF2	Rock Island, IL	4.2	440
June 22	7:16 PM CDT	EF0	Whiteside, IL	2.6	50
June 22	7:16 PM CDT	EF1	Whiteside, IL	1.7	50
June 22	7:28 PM CDT	EF1	Lee, IL	7.4	50
June 22	7:53 PM CDT	EF2	Lee, IL	7.8	880	7	$1.0 million
June 22	8:19 PM CDT	EF1	LaSalle, IL	1.5	150		$100,000
June 22	8:50 PM CDT	EF1	LaSalle, IL	6.0	150		$100,000
June 22	10:00 PM EDT	EF2	Saginaw, MI	11.3	250	2	$600,000
June 22	10:07 PM EDT	EF1	Tuscola, MI	22.9	250		$501,000
June 22	9:17 PM CDT	EF1	Grundy, IL	7.0	150		$50,000
June 22	9:43 PM CDT	EF1	Grundy, IL	0.8	100		$50,000
June 22	9:45 PM CDT	EF3	Grundy, IL	16.3	1,320	7	$25 million
June 22	10:08 PM CDT	EF1	Kankakee, IL	2.2	300
June 22	11:55 PM EDT	EF0	Saint Clair, MI	0.6	50		$10,000
June 22	11:46 PM CDT	EF0	Kankakee, IL	1.0	50
June 22	1:31 AM EDT	EF1	Washtenaw, MI	4.3	100		$300,000

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.