Tornadoes · United States · Kansas · 2015
EF1 tornado, Eudora to Olathe Cedar Park, Kansas, July 6, 2015
From Eudora to Olathe Cedar Park, this EF1 tornado ran 8.3 miles across Douglas and Johnson counties on July 6, 2015, touching down at 5:12 PM CDT and reaching 250 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 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
- July 6, 2015
- Touchdown
- 5:12 PM CDT (22:12 UTC)
- Lifted
- 5:23 PM CDT (22:23 UTC)
- On the ground
- 11 minutes
- Path length
- 8.3 miles (13.4 km)
- Path width
- 250 yards (229 m)
- Deaths
- 0
- Injuries
- 0
- Counties
- Douglas and Johnson counties
- Touchdown point
- 38.936, -95.122
- Lift-off point
- 38.942, -95.012
- Record number
- 1507061612-01
The damage survey
6 damage points were recorded along this path by NWS EAX and NWS TOP, in the Damage Assessment Toolkit the survey teams carry. The strongest indicator was rated EF1. The highest wind the damage implies is 93 mph.
- A line of trees all broken off at the base. Bases weakened prior to wind. All trees pointing northeast. Other trees unscathed.
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
A line of severe thunderstorms produced a small tornado that hit Eudora. The tornado tracked around 6.5 miles doing sporadic tree damage along its path. Some portions of the line produced severe wind gusts and caused damage. Heavy rainfall caused flash flooding in Jackson and Shawnee counties.
A slow moving cold front advanced into an extremely unstable air mass over eastern Kansas and northwestern and west central Missouri. Thunderstorms developed along the front producing extremely heavy rain, with some areas seeing up to 5, flash flooding, damaging winds and a few tornadoes.
Damage assessment survey found a path of sporadic tree damage extending approximately 6 miles along a line from Eudora to around 3 miles southwest of De Soto in Johnson County. This tornado did cross from Douglas County Kansas which is NWS Topeka's area into Johnson County Kansas which is NWS Kansas City's service area. EF1 tree damage was noted along the path. Width of damage estimated 250 yards maximum while majority of tornado damage path was more narrow on order of 50 to 100 yards.
This tornado entered Johnson County, KS from Douglas County, east of Eudora near K10 and continued to track east for over two miles before lifting. Winds were estimated to be between 100 and 107 mph.
A weak tornado with winds of 70-75 mph caused tree damage.
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 Topeka, KS wrote its last area forecast discussion before the tornado touched down at Jul 6, 3:19 PM CDT, 1 hour 53 minutes earlier.
Area forecast discussion, Jul 6, 3:19 PM CDT, 1 hour 53 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TOPEKA KS 319 PM CDT MON JUL 6 2015 .SHORT TERM...(THIS EVENING THROUGH TUESDAY) ISSUED AT 307 PM CDT MON JUL 6 2015 ONGOING THUNDERSTORMS ARE LIKELY TO CONTINUE TO PUSH QUICKLY EAST AND NORTHEAST AND ARE ALSO LIKELY TO GAIN INTENSITY THROUGH LATE AFTERNOON INTO EARLY EVENING AS THEY MOVE INTO AN INCREASINGLY UNSTABLE ENVIRONMENT. WIND SHEAR REMAINS MARGINAL FOR STORM ORGANIZATION BUT COLD POOLS ARE ORGANIZING WELL AND SURGING EAST WITH REPORTS TO 70 MPH ALREADY AND POCKETS OF 70 MPH OR STRONGER LIKELY TO PERSIST WITHIN THE STRONGEST STORMS. VERY HEAVY RAINFALL IS ALSO OCCURRING WITH THESE STORMS WITH REPORTS OF AT LEAST TEMPORARY RATES OF 1.25 INCHES IN 30 MINUTES. THIS RAIN INTENSITY IS ALSO LIKELY TO CONTINUE OR EVEN INTENSIFY WITH RAINFALL RATES POTENTIALLY EXCEEDING 2 INCHES PER HOUR AT TIMES. THE NEAR TERM FORECAST IS THE FOCUS OF THIS FORECAST PACKAGE AND WITH WARNINGS ONGOING, WILL FOCUS THE DISCUSSION ON THIS PERIOD. STORMS ARE LIKELY TO QUICKLY PUSH SOUTHEAST GIVEN THE COLD POOL ORGANIZATION AND PUSH OUT OF EAST CENTRAL KANSAS BY MID EVENING. WHILE SOME REDEVELOPMENT IS POSSIBLE IN AN ELEVATED NATURE BEHIND THE FRONT OVERNIGHT DO NOT EXPECT THE SEVERE THREAT TO CONTINUE MUCH BEYOND THE INITIAL SEVERE LINE. HOWEVER...THE HEAVY RAIN POTENTIAL WILL CONTINUE INTO THE OVERNIGHT HOURS MAINLY IN EAST CENTRAL KANSAS...MAINLY FOCUSED IN THE FLASH FLOOD WATCH AREA. .LONG TERM...(TUESDAY NIGHT THROUGH MONDAY) ISSUED AT 307 PM CDT MON JUL 6 2015 THE MID AND LONG TERM PERIOD HAS CHANGED LITTLE IN TERMS OF THE FORECAST. HAVE MAINTAINED THE LONG-LIVED FLASH FLOOD WATCH ALTHOUGH WITH LOWER END CONFIDENCE BEYOND TONIGHT. HOWEVER... IT APPEARS LIKELY THAT ONE OR MORE ROUNDS OF HEAVY RAIN WILL MOVE THROUGH THE AREA WITH THE BEST CHANCE FOR THESE IN EAST CENTRAL KANSAS COUNTIES. THE GFS IS THE DRY OUTLIER OF THE MODEL SUITE WITH THE TREND BEING SOUTH OF THE AREA WITH THE HEAVIEST PRECIPITATION BUT OTHER GUIDANCE IS PERSISTENT ENOUGH WITH BRINGING HEAVY RAIN INTO THE AREA THAT IT WARRANTS WATCH CONTINUATION. THE LONG TERM FORECAST LOOKS TO DRY OUT AND HEAT UP AS AN UPPER RIDGE GRADUALLY BUILDS INTO THE AREA. && .AVIATION...(FOR THE 18Z TAFS THROUGH 18Z TUESDAY AFTERNOON) ISSUED AT 1231 PM CDT MON JUL 6 2015 GUSTY SOUTHERLY AND SOUTHWESTERLY WINDS EARLY THIS AFTERNOON WITH POTENTIAL FOR SCATTERED THUNDERSTORMS BEFORE THE PUSH FROM THE COLD FRONT ARRIVES AT THE TERMINALS FROM 20-23Z TIME FRAME GENERALLY ADVANCING FROM NORTHWEST TO SOUTHEAST. AFTER THAT, MORE WIDESPREAD AND PROLONGED RAIN IS EXPECTED INTO THE OVERNIGHT HOURS. VARYING VIS/CIG CONDITIONS SHOULD BE EXPECTED WITH PERIODS OF MVFR TO IFR CONDITIONS POSSIBLE AND THEN A PERIOD OF IFR POSSIBLE IN THE MORNING EARLY BEFORE GENERALLY IMPROVING CONDITIONS CAN BE EXPECTED AFTER AROUND THE 14Z TIME FRAME. AFTER FROPA, WINDS SHOULD BE GUSTY FROM THE NORTH/NORTHWEST. && .TOP WATCHES/WARNINGS/ADVISORIES... FLASH FLOOD WATCH THROUGH WEDNESDAY EVENING FOR KSZ040-054>056- 058-059. && SHORT TERM...BARJENBRUCH/SANDERS LONG TERM...BARJENBRUCH AVIATION...DRAKE
Hazardous weather outlook, Jul 6, 4:35 PM CDT, 37 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TOPEKA KS 435 PM CDT MON JUL 6 2015 KSZ008>012-020>024-026-034>040-054>056-058-059-072145- REPUBLIC-WASHINGTON-MARSHALL-NEMAHA-BROWN-CLOUD-CLAY-RILEY- POTTAWATOMIE-JACKSON-JEFFERSON-OTTAWA-DICKINSON-GEARY-MORRIS- WABAUNSEE-SHAWNEE-DOUGLAS-LYON-OSAGE-FRANKLIN-COFFEY-ANDERSON- 435 PM CDT MON JUL 6 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL...NORTH CENTRAL AND NORTHEAST KANSAS. .DAY ONE...TONIGHT. THUNDERSTORMS WILL CONTINUE TO MOVE ACROSS THE AREA THROUGH THIS EVENING. SOME OF THESE STORMS WILL BE SEVERE...CAPABLE OF PRODUCING WINDS TO 70 MPH. TORRENTIAL RAINFALL IS ALSO LIKELY AND WILL PRODUCE AREAS OF FLASH FLOODING. THE AREA WITH THE GREATEST RISK FOR DAMAGING WINDS AND FLASH FLOODING IS SOUTH OF A COUNCIL GROVE TO HOLTON LINE THROUGH THE REMAINDER OF THE EVENING. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. A FLASH FLOOD WATCH CONTINUES THROUGH WEDNESDAY AFTERNOON ALONG AND SOUTH OF A LINE FROM EMPORIA TO LAWRENCE WITH MULTIPLE ROUNDS OF HEAVY RAINFALL EXPECTED MAINLY TUESDAY NIGHT AND WEDNESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THROUGH 10 PM. && MORE DETAILED INFORMATION CAN BE ACCESSED AT... HTTP://WWW.WEATHER.GOV/TOP/SITREP
In the hours before
Local storm report, Jul 6, 4:48 PM CDT, 24 minutes before
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</html>Special weather statement, Jul 6, 4:54 PM CDT, 18 minutes before
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</html>Local storm report, Jul 6, 4:56 PM CDT, 16 minutes before
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</html>Special weather statement, Jul 6, 5:00 PM CDT, 12 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TOPEKA KS
500 PM CDT MON JUL 6 2015
KSZ040-056-062245-
FRANKLIN-DOUGLAS-
500 PM CDT MON JUL 6 2015
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN DOUGLAS AND FRANKLIN
COUNTIES UNTIL 545 PM CDT...
AT 459 PM CDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM LAWRENCE TO POMONA...AND
MOVING EAST AT 35 MPH.
WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THESE STORMS.
LOCATIONS IMPACTED INCLUDE...
SOUTHERN LAWRENCE...OTTAWA...BALDWIN CITY...EUDORA...WELLSVILLE...
CENTROPOLIS...POMONA...LONE STAR...PRINCETON...LANE...RANTOUL...
PLEASANT GROVE...GLOBE AND VINLAND.
THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 173 AND 198.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.
&&
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT FOR
EAST CENTRAL KANSAS.
LAT...LON 3843 9507 3852 9551 3862 9551 3893 9533
3895 9506
TIME...MOT...LOC 2159Z 273DEG 31KT 3895 9526 3860 9544
SANDERSLocal storm report, Jul 6, 5:04 PM CDT, 8 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TOPEKA KS
504 PM CDT MON JUL 06 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0503 PM HEAVY RAIN 6 NE TALMAGE 39.09N 97.18W
07/06/2015 E1.11 INCH DICKINSON KS TRAINED SPOTTER
&&
BARJENBRUCHLocal storm report, Jul 6, 5:10 PM CDT, 2 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TOPEKA KS
510 PM CDT MON JUL 06 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0500 PM FLASH FLOOD 4 WNW HOYT 39.27N 95.78W
07/06/2015 JACKSON KS LAW ENFORCEMENT
SEVERAL ROADS IMPASSABLE OR WASHED OUT IN SOUTHERN
JACKSON COUNTY. THIS INCLUDES NEAR 118TH AND O...114TH
AND K...126TH AND K...110TH AND P4...AND K ROAD NORTH OF
110TH.
&&
BARJENBRUCHThe 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.
Topeka, KS (KFOE), 12:00Z
10.2 hours before the tornado, 50 km from the path. July 6, 2015.
- Mixed-layer CAPE
- 625 J/kg
- Mixed-layer CIN
- -194 J/kg
- Surface CAPE
- 1465 J/kg
- Mixed-layer LCL
- 1151 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 94 m²/s²
- 0-3 km storm-relative helicity
- 131 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
- 0-3 km lapse rate
- 4.4 K/km
The surface observations
Lawrence (LWC), 15 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 Pleasant Hill radar (KEAX), 71 km away, was scanning. The volume nearest the touchdown began at 22:09 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 2015 tornado in KansasEvery tornado in Kansas since 1950Warnings in force in Kansas nowThe forecast where you are
The other tornadoes of July 6, 2015
5 more were confirmed in the United States that day.
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.