Tornadoes · United States · Iowa · 2011
EF1 tornado, New Sharon, Iowa, June 20, 2011
This EF1 tornado ran 0.3 miles across Mahaska County on June 20, 2011, touching down at 4:59 AM CDT and reaching 75 yards wide. It killed nobody, and did $150,000 of property damage.
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 mph
Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.
EF186 to 110 mphthis tornado
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
- EF1
- Date
- June 20, 2011
- Touchdown
- 4:59 AM CDT (09:59 UTC)
- Lifted
- 5:01 AM CDT (10:01 UTC)
- On the ground
- 2 minutes
- Path length
- 0.3 miles (0.6 km)
- Path width
- 75 yards (69 m)
- Deaths
- 0
- Injuries
- 0
- Property damage
- $150,000
- Crop damage
- $3,000
- County
- Mahaska County
- Touchdown point
- 41.462, -92.653
- Lift-off point
- 41.463, -92.646
- Record number
- 1106200359-01
What the Weather Service recorded
A strong warm front was located to the south of Iowa as a very strong push of warm and moist air was driven north into the area by a 60 kt low level jet. The airmass was very unstable with CAPE greater than 5000 J/kg with lifted indices near -10 just to the south of the front. The airmass was relatively capped with 700 mb temperatures around +15 C. Precipitable water values increased to near 2 inches. Convection developed rapidly over southwest Iowa during the late evening The activity became severe quickly, producing hail of quarter to ping pong ball in size. Intense rainfall also occurred with the storms with rainfall of one to three inches per hour reported. As the storm system evolved, the storms began to turn into wind producing storms over southern Iowa. Winds of around 60 MPH blew across the southern two tiers of counties, causing damage to trees, power lines, and some minor damage to outbuildings in the area. One of the stronger storms blew the awning off of a camper and ripped siding from part of a house northeast of Russell in Lucas County. As the night progressed, thunderstorms continued to develop and wind became more of an issue. High winds also caused damage in Cass County at Atlantic. Numerous locations reported winds of 50 MPH with the storms as well. One tornado touched down in Mahaska County near New Sharon. It was a small tornado with damage embedded in a narrow path of straight line wind damage. Most of the damage was to trees and occurred on the south side of New Sharon and 2 miles to the west and east. The tornado destroyed one quarter of a rental building and carried it up to one quarter of a miles across a cemetery and part of the high school track. At least 40 gravestones were toppled by the wind and carried debris.
Winds estimated at 110 MPH. Numerous trees downed with some trees on top of houses. Power lines down and storage shed shifted from its foundation and cars pushed into a ditch.
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 Des Moines, IA wrote its last area forecast discussion before the tornado touched down at Jun 20, 3:30 AM CDT, 1 hour 29 minutes earlier.
Area forecast discussion, Jun 20, 3:30 AM CDT, 1 hour 29 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DES MOINES IA 330 AM CDT MON JUN 20 2011 .DISCUSSION... BUSY MORNING WITH STRONG WAA AND THETA-E ADVECTION INTO THE STATE WITH +60KTS LLJ FOCUSED INTO THE STATE. WIDESPREAD CONVECTION HAS BEEN ONGOING AND WILL CONTINUE INTO THE MORNING AS THUNDERSTORMS ADVECT IN FROM NEBRASKA. HAVE EXPANDED THE FLASH FLOOD WATCH ANOTHER ROW OF COUNTIES TO THE NORTH AS THE LINE FOCUSES IN ON THE I80 CORRIDOR. SEVERE WEATHER WITH LARGE HAIL AND DAMAGING WINDS WILL ALSO REMAIN THROUGH THE MORNING WITH THESE STORMS. SOME BREAK FORESEEN BY MIDDAY INTO THE AFTERNOON ACRS MUCH OF THE AREA AS EML MOVES ACRS MUCH OF THE STATE. HOWEVER...AS UPPER LOW APPROACHES LATE IN THE DAY...CAP SHOULD ERODE WITH THUNDERSTORMS OVERSPREADING THE STATE FROM WEST TO EAST THIS EVENING. SUBSTANTIAL SHEAR AND INSTABILITY WILL MAKE ALL MODES OF SEVERE WEATHER POSSIBLE THIS EVENING INCLUDING SOME TORNADOES...ESPECIALLY IN WESTERN IA. SYSTEM LIKELY TO EVOLVE INTO A LINEAR FORMATION WITH WIND AND HAIL BECOMING MORE LIKELY INTO THE OVERNIGHT. SYSTEM THEN GRADUALLY CUTSOFF WITH UPPER LOW LINGERING ACRS THE UPPER MIDWEST THROUGH THURSDAY. WILL STILL SEE THE THREAT FOR SOME SEVERE CONVECTION INTO TUESDAY AS SFC LOW STAYS JUST WEST OF THE AREA. THE LINGERING THREAT OF PRECIPITATION WILL REMAIN INTO WEDNESDAY AND EVEN THURSDAY...BUT WITH LESS INSTABILITY AND THUNDERSTORMS BECOMING MORE ISOLATED. NO CHANGES BEYOND THIS POINT DUE TO THE ONGOING ACTIVITY. && .AVIATION...20/06Z THUNDERSTORMS WILL MOVE ACROSS CENTRAL IOWA MONDAY MORNING PRODUCING MVFR TO IFR CONDITIONS IN AND AROUND THE THUNDERSTORMS. SFC WINDS WILL INCREASE FROM THE EAST AS A WARM FRONT APPROACHES SOUTHERN IOWA. SURFACE WIND GUSTS IN EXCESS OF 40KTS WILL OCCUR NEAR THUNDERSTORMS AS WELL WITH THE CONVECTION ON MONDAY MORNING. && .DMX WATCHES/WARNINGS/ADVISORIES... FLASH FLOOD WATCH UNTIL 1 PM CDT THIS AFTERNOON FOR ADAIR-ADAMS-APPANOOSE-AUDUBON-CASS-CLARKE-DALLAS-DAVIS-DECATUR- GUTHRIE-JASPER-LUCAS-MADISON-MAHASKA-MARION-MONROE-POLK-POWESHIEK- RINGGOLD-TAYLOR-UNION-WAPELLO-WARREN-WAYNE. && DISCUSSION..COGIL AVIATION...COGIL
Hazardous weather outlook, Jun 19, 10:03 PM CDT, 6 hours 56 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 1003 PM CDT SUN JUN 19 2011 IAZ033>039-044>050-057>062-070>075-081>086-092>097-210315- SAC-CALHOUN-WEBSTER-HAMILTON-HARDIN-GRUNDY-BLACK HAWK-CRAWFORD- CARROLL-GREENE-BOONE-STORY-MARSHALL-TAMA-AUDUBON-GUTHRIE-DALLAS-POLK- JASPER-POWESHIEK-CASS-ADAIR-MADISON-WARREN-MARION-MAHASKA-ADAMS- UNION-CLARKE-LUCAS-MONROE-WAPELLO-TAYLOR-RINGGOLD-DECATUR-WAYNE- APPANOOSE-DAVIS- 1003 PM CDT SUN JUN 19 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA. .DAY ONE...TONIGHT SEVERE THUNDERSTORMS ARE EXPECTED TO ACROSS SOUTHERN AND CENTRAL IOWA MUCH OF THE NIGHT. GOLF BALL SIZE HAIL AND DAMAGING WINDS TO 70 MPH ARE THE MAIN THREATS. A FEW TORNADOES WILL ALSO BE POSSIBLE THROUGH 2 AM PRIMARILY ACROSS THE SOUTHERN HALF OF IOWA. LOCALIZED HEAVY RAINFALL WILL ALSO BE POSSIBLE. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY A SIGNIFICANT SEVERE THUNDERSTORM OUTBREAK APPEARS LIKELY MONDAY EVENING THROUGH MONDAY NIGHT IN CENTRAL IOWA. GOLF BALL SIZE OR LARGER HAIL...DAMAGING WIND TO 75 MPH AND A FEW TORNADOES WILL BE POSSIBLE. LOCALIZED HEAVY RAINFALL IS ALSO EXPECTED. THIS EVENT HAS THE POTENTIAL FOR SUBSTANTIAL SEVERE STORMS TO CONTINUE THROUGH MONDAY NIGHT WITH THE POTENTIAL FOR A FEW OVERNIGHT TORNADOES. ADDITIONAL THUNDERSTORMS ARE EXPECTED INTO TUESDAY AND WEDNESDAY AS WELL AS LATE FRIDAY INTO SATURDAY. THE THREAT FOR SEVERE STORMS APPEARS LOW AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS EXPECTED THIS EVENING INTO TONIGHT AS WELL AS MONDAY EVENING AND NIGHT. AN EMERGENCY MANAGERS CONFERENCE CALL WILL LIKELY BE NEEDED MONDAY. IAZ004-005-024-210315- EMMET-KOSSUTH-HUMBOLDT- 1003 PM CDT SUN JUN 19 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA. .DAY ONE...TONIGHT SCATTERED SEVERE THUNDERSTORMS ARE EXPECTED TONIGHT. PING PONG BALL SIZED HAIL AND DAMAGING WINDS TO 60 MPH ARE THE MAIN THREATS. LOCALIZED HEAVY RAINFALL IS ALSO POSSIBLE. RIVER FLOOD WARNINGS ARE IN EFFECT FOR PORTIONS OF THE UPPER DES MOINES RIVER BASIN. PLEASE REFER TO THE NATIONAL WEATHER SERVICE WEBSITE AT WEATHER.GOV/DESMOINES FOR FURTHER DETAILS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY A SIGNIFICANT SEVERE THUNDERSTORM OUTBREAK APPEARS LIKELY MONDAY EVENING INTO MONDAY NIGHT IN CENTRAL IOWA. GOLF BALL SIZE HAIL AND DAMAGING WIND TO 70 MPH AND A FEW TORNADOES WILL BE POSSIBLE. LOCALIZED HEAVY RAINFALL IS ALSO EXPECTED. THIS EVENT HAS THE POTENTIAL FOR SUBSTANTIAL SEVERE STORMS TO CONTINUE THROUGH MONDAY NIGHT WITH THE POTENTIAL FOR A FEW OVERNIGHT TORNADOES. ADDITIONAL THUNDERSTORMS ARE EXPECTED INTO TUESDAY AND WEDNESDAY AS WELL AS LATE FRIDAY INTO SATURDAY. THE THREAT FOR SEVERE STORMS APPEARS LOW AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL BE LIKELY TONIGHT AND WILL BE NEEDED MONDAY EVENING INTO MONDAY NIGHT. AN EMERGENCY MANAGERS CONFERENCE CALL WILL LIKELY BE NEEDED MONDAY AS THE SITUATION EVOLVES. IAZ006-007-015>017-023-025>028-210315- WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO-POCAHONTAS-WRIGHT- FRANKLIN-BUTLER-BREMER- 1003 PM CDT SUN JUN 19 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA. .DAY ONE...TONIGHT SCATTERED THUNDERSTORMS ARE EXPECTED TONIGHT WITH PING PONG BALL SIZED HAIL AND DAMAGING WIND GUSTS TO 60 MPH THE MAIN THREATS. LOCALIZED HEAVY RAINFALL IS ALSO POSSIBLE. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY A SIGNIFICANT SEVERE THUNDERSTORM OUTBREAK APPEARS LIKELY MONDAY EVENING INTO MONDAY NIGHT IN CENTRAL IOWA. GOLF BALL SIZED HAIL AND DAMAGING WIND TO 70 MPH ALONG WITH A FEW TORNADOES WILL ALL BE POSSIBLE. LOCALIZED HEAVY RAINFALL IS ALSO EXPECTED. THIS EVENT HAS THE POTENTIAL FOR SUBSTANTIAL SEVERE STORMS TO CONTINUE THROUGH MONDAY NIGHT WITH THE POTENTIAL FOR A FEW OVERNIGHT TORNADOES. ADDITIONAL THUNDERSTORMS ARE EXPECTED INTO TUESDAY AND WEDNESDAY AS WELL AS LATE FRIDAY INTO SATURDAY. THE THREAT FOR SEVERE STORMS APPEARS LOW AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL BE LIKELY TONIGHT AND WILL BE NEEDED MONDAY EVENING INTO MONDAY NIGHT. AN EMERGENCY MANAGERS CONFERENCE CALL WILL LIKELY BE NEEDED MONDAY AS THE SITUATION EVOLVES. FAB
In the hours before
Local storm report, Jun 20, 2:37 AM CDT, 2 hours 22 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
237 AM CDT MON JUN 20 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0231 AM HAIL MURRAY 41.04N 93.95W
06/20/2011 E0.88 INCH CLARKE IA TRAINED SPOTTER
&&
BFSpecial weather statement, Jun 20, 2:37 AM CDT, 2 hours 22 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 237 AM CDT MON JUN 20 2011 IAZ072-073-083-200800- CLARKE-MADISON-WARREN- 237 AM CDT MON JUN 20 2011 ...NICKEL HAIL POSSIBLE... AT 234 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER CENTRAL CLARKE COUNTY...MOVING NORTHEAST AT 25 MPH. NICKEL SIZE HAIL...ARE POSSIBLE WITH THIS STORM. * THE THUNDERSTORM WILL BE NEAR... TRURO BY 255 AM CDT... NEW VIRGINIA AND 7 MILES SOUTH OF ST. CHARLES BY 300 AM CDT... SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED. BEERENDS
Special weather statement, Jun 20, 4:02 AM CDT, 57 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 402 AM CDT MON JUN 20 2011 IAZ060-073-074-084-200930- LUCAS-MARION-POLK-WARREN- 402 AM CDT MON JUN 20 2011 ...NICKEL HAIL POSSIBLE... AT 401 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 14 MILES WEST OF DES MOINES TO 27 MILES SOUTHEAST OF INDIANOLA...MOVING NORTHEAST AT 45 MPH. NICKEL SIZE HAIL...BRIEF MODERATE DOWNPOURS...ARE POSSIBLE WITH THESE STORMS. LOCATIONS IMPACTED INCLUDE... DES MOINES INT AIRPORT... SANDYVILLE... KNOXVILLE AIRPORT... PLEASANTVILLE... KNOXVILLE... HARTFORD... DES MOINES... CARLISLE... SWAN... RUNNELLS... PLEASANT HILL... LAKE RED ROCK... HARVEY... SEEK SHELTER IN A STURDY STRUCTURE UNTIL THESE STORMS HAVE PASSED. BEERENDS
Special weather statement, Jun 20, 4:27 AM CDT, 32 minutes before
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</html>Special weather statement, Jun 20, 4:41 AM CDT, 18 minutes before
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</html>Special weather statement, Jun 20, 4:43 AM CDT, 16 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 443 AM CDT MON JUN 20 2011 IAZ058-059-071-072-201015- ADAIR-DALLAS-GUTHRIE-MADISON- 443 AM CDT MON JUN 20 2011 ...GUSTY WINDS POSSIBLE... AT 438 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER SOUTH CENTRAL GUTHRIE COUNTY...MOVING EAST AT 55 MPH. ONE HALF INCH DIAMETER HAIL...WINDS UP TO 50 MPH...BRIEF MODERATE DOWNPOURS...ARE POSSIBLE WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... STUART... PANORA... LINDEN... DEXTER... REDFIELD... GUSTY WINDS MAY CAUSE SMALL BRANCHES TO BE BLOWN DOWN...AND LOOSE OBJECTS TO BLOW AROUND. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED. BEERENDS
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.
Davenport, (KDVN), 00:00Z
10.0 hours before the tornado, 180 km from the path. June 20, 2011.
- Mixed-layer CAPE
- 2723 J/kg
- Mixed-layer CIN
- -5 J/kg
- Surface CAPE
- 5196 J/kg
- Mixed-layer LCL
- 881 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 88 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 6.0
- 0-3 km lapse rate
- 6.1 K/km
Davenport, (KDVN), 12:00Z
2.0 hours after it, 180 km from the path. June 20, 2011.
- Mixed-layer CAPE
- 739 J/kg
- Mixed-layer CIN
- -240 J/kg
- Surface CAPE
- 18 J/kg
- Mixed-layer LCL
- 1198 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km bulk shear
- 3 kt
- 0-1 km storm-relative helicity
- -14 m²/s²
- 0-3 km storm-relative helicity
- 43 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
- 0-3 km lapse rate
- 4.1 K/km
The surface observations
Pella (PEA), 25 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 Des Moines radar (KDMX), 94 km away, was scanning. The volume nearest the touchdown began at 10:01 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 trackEvery 2011 tornado in IowaEvery tornado in Iowa since 1950Warnings in force in Iowa nowThe forecast where you are
The other tornadoes of June 20, 2011
37 more were confirmed in the United States that day.
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|---|---|---|---|---|---|---|---|
| June 20 | 6:14 AM CDT | EF0 | Kankakee, IL | 2.4 | 100 | $100,000 | ||
| June 20 | 12:55 PM CDT | EF0 | Gove, KS | 1.1 | 25 | |||
| June 20 | 1:00 PM CDT | EF0 | Gove, KS | 2.7 | 25 | |||
| June 20 | 1:12 PM CDT | EF0 | Graham, KS | 4.8 | 25 | |||
| June 20 | 1:54 PM CDT | EF3 | Graham, KS | 11.9 | 600 | $6.0 million | ||
| June 20 | 1:57 PM CDT | EF1 | Graham, KS | 0.6 | 25 | $500,000 | ||
| June 20 | 2:04 PM CDT | EF1 | Graham, KS | 0.9 | 25 | $500,000 | ||
| June 20 | 2:15 PM CDT | EF0 | Norton, KS | 1.8 | 20 | |||
| June 20 | 2:22 PM CDT | EF0 | McLean, ND | 0.3 | 10 | |||
| June 20 | 2:25 PM CDT | EF3 | Norton, KS | 3.9 | 100 | $350,000 | ||
| June 20 | 2:26 PM CDT | EF1 | Norton, KS | 0.3 | 25 | $10,000 | ||
| June 20 | 2:30 PM CDT | EF2 | Norton, KS | 4.0 | 75 | $300,000 | ||
| June 20 | 2:35 PM CDT | EF0 | Norton, KS | 1.6 | 20 | |||
| June 20 | 2:41 PM CDT | EF3 | Norton, KS | 8.4 | 100 | $10 million | ||
| June 20 | 2:42 PM CDT | EF0 | Morton, ND | 0.3 | 30 | |||
| June 20 | 3:00 PM CDT | EF1 | Harlan, NE | 12.5 | 100 | $250,000 | ||
| June 20 | 3:35 PM CDT | EF0 | Phelps, NE | 4.8 | 300 | $750,000 | ||
| June 20 | 3:51 PM CDT | EF2 | Buffalo, NE | 4.0 | 440 | 1 | $750,000 | |
| June 20 | 4:09 PM CDT | EF3 | Buffalo, NE | 10.0 | 1,320 | $6.0 million | ||
| June 20 | 4:35 PM CDT | EF0 | Buffalo, NE | 3.6 | 50 | |||
| June 20 | 4:46 PM CDT | EF2 | Sherman, NE | 2.5 | 200 | $100,000 | ||
| June 20 | 5:05 PM CDT | EF0 | Howard, NE | 0.1 | 50 | $80,000 | ||
| June 20 | 5:25 PM CDT | EF2 | Hamilton, NE | 9.4 | 440 | $2.5 million | ||
| June 20 | 5:27 PM CDT | EF0 | Sheridan, KS | 0.5 | 10 | |||
| June 20 | 5:35 PM CDT | EF1 | Valley, NE | 1.0 | 100 | $50,000 | ||
| June 20 | 5:40 PM CDT | EF2 | York, NE | 15.3 | 440 | $3.5 million | ||
| June 20 | 6:02 PM CDT | EF3 | Polk, NE | 9.5 | 880 | $4.0 million | ||
| June 20 | 6:25 PM CDT | EF0 | Decatur, KS | 0.5 | 10 | |||
| June 20 | 6:44 PM CDT | EF0 | Norton, KS | 0.5 | 10 | |||
| June 20 | 6:45 PM CDT | EF0 | Decatur, KS | 0.5 | 10 | |||
| June 20 | 7:27 PM CDT | EF1 | Pierce, NE | 12.0 | 400 | |||
| June 20 | 8:00 PM CDT | EF1 | Dodge, NE | 6.5 | 700 | $280,000 | ||
| June 20 | 8:09 PM CDT | EF1 | Washington, NE | 7.3 | 850 | |||
| June 20 | 8:45 PM CDT | EF1 | Monona, IA | 7.1 | 300 | |||
| June 20 | 8:46 PM CDT | EF0 | Stephens, TX | 0.0 | 30 | |||
| June 20 | 9:40 PM CDT | EF0 | Plymouth, IA | 0.9 | 100 | $20,000 | ||
| June 20 | 11:22 PM CDT | EF1 | Kossuth, IA | 1.2 | 75 | $200,000 |
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.