Tornadoes · United States · Arkansas · 2013

EF1 tornado, Rushing to Fox, Arkansas, April 10, 2013

From Rushing to Fox, this EF1 tornado ran 4.1 miles across Stone County on April 10, 2013, touching down at 5:07 PM CDT and reaching 300 yards wide. It killed nobody, and did $200,000 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.

  1. EF065 to 85 mph

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

  2. EF186 to 110 mphthis tornado

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

  3. 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.

  4. 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.

  5. EF4166 to 200 mph

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

  6. 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.

  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
EF1
Date
April 10, 2013
Touchdown
5:07 PM CDT (22:07 UTC)
Lifted
5:14 PM CDT (22:14 UTC)
On the ground
7 minutes
Path length
4.1 miles (6.7 km)
Path width
300 yards (274 m)
Deaths
0
Injuries
0
Property damage
$200,000
County
Stone County
Touchdown point
35.749, -92.284
Lift-off point
35.807, -92.262
Record number
1304101607-01

The damage survey

22 damage points were recorded along this path by NWS LZK, in the Damage Assessment Toolkit the survey teams carry. The strongest indicator was rated EF2. The highest wind the damage implies is 135 mph.

  • Roof off wood house; shop building destroyed.
  • Trees uprooted and power lines down.
  • Old church building being used as a house destroyed; foundation intact. Vehicles overturned.
  • Metal church building destroyed.

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

Severe storms developed ahead of an advancing cold front on the afternoon and evening of the 10th. A few tornadoes occurred, and there were also reports of large hail and damaging winds.

An EF1 tornado blew down several hay barns and some unused chicken houses. Numerous trees and some power lines were also blown down.

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 Little Rock, AR wrote its last area forecast discussion before the tornado touched down at Apr 10, 2:41 PM CDT, 2 hours 26 minutes earlier.

Area forecast discussion, Apr 10, 2:41 PM CDT, 2 hours 26 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LITTLE ROCK AR
241 PM CDT WED APR 10 2013

.DISCUSSION...

MAIN CONCERNS THIS FORECAST CYCLE ARE CHANCES OF SEVERE WEATHER
AHEAD OF THE FRONT...THEN CONVECTION BEHIND THE FRONT.
TEMPERATURE FORECAST IS ALSO CHALLENGING WITH STRONG TEMP DROP
ASSOCIATED WITH THE COLD FRONT.

18Z UPPER AIR SOUNDING CONTINUED TO INDICATE A WEAKER INVERSION
AROUND 10K FEET...QUITE MOIST WITH A PRECIP WATER VALUE OF 1.42
INCHES...LI OF -8...CAPE 3500 J/KG AND A VEERING PROFILE. TORNADO
WATCH WENT OUT AROUND 120 PM FOR PARTS OF WESTERN AR...MUCH OF CENTRAL
AND EASTERN AR THROUGH 9 PM. THIS AFTERNOON HAVE ONLY SEEN
ISOLATED STORMS AHEAD OF THE COLD FRONT...NOW MAINLY IN A CORRIDOR
OVER SW TO WEST AR...ASSOCIATED WITH LOW LEVEL JET AND MOISTURE
INFLUX. SOME CONVECTION HAS CONTINUED WEST OF THE COLD FRONT OVER
OK TO E KS AND SW MO. THE UPPER PATTERN REMAINS CLOSE TO PARALLEL
TO THE FRONTAL BOUNDARY...AND LIFT IS GOING NNE AROUND THE UPPER
LOW OVER THE NEB PANHANDLE. THE COLD FRONT HAS WAFFLED AROUND
KHRO...NEAR CLARKSVILLE AND RUSSELLVILLE...STILL WEST OF
KMEZ...THEN TO NEAR THE SE CORNER OF OK. WILL STILL SEE SOME
WAFFLING OF THE FRONT THIS AFTERNOON TO EVENING BEFORE IT
GRADUALLY DRIFTS EAST LATER THIS EVENING AND OVERNIGHT. THE MAIN
SEVERE STORM THREAT WILL BE LARGE HAIL AND DAMAGING WINDS...WHILE
ISOLATED TORNADOES WILL STILL BE POSSIBLE OVER CENTRAL TO EASTERN
AR.

AREAS OF HEAVY RAIN WILL BE SEEN WITH SOME POTENTIAL FOR
LOCALIZED FLASH FLOODING. RAIN AMOUNTS ARE STILL EXPECTED TO BE 1
TO 2 INCHES WITH ISOLATED HIGHER TO 3 INCHES THROUGH THURSDAY
MORNING DUE TO HIGH PRECIP WATER VALUES. TEMPERATURE FORECAST HAS
ALSO BECOME TRICKY WITH THE COLD FRONT. 70S AHEAD OF THE FRONT
WHILE 50S TO SOME 40S BEHIND IT. SOUTH WINDS REMAIN ELEVATED OVER
AR AHEAD OF THE FRONT AND A LAKE WIND ADVISORY IS IN EFFECT UNTIL
10 PM.

&&

.SHORT TERM...TONIGHT THROUGH SATURDAY NIGHT

PER CURRENT TRENDS...WILL HAVE HIGH POP...CHANCE OF ISOLATED
SEVERE STORMS...AND HEAVY RAIN RISK IN THE FIRST TO SECOND
PERIODS. ISOLATED STRONG TO SEVERE STORMS WILL BE POSSIBLE AHEAD
OF THE COLD FRONT AS CAP WEAKENS AND SOME UPPER LEVEL SHORT WAVE
ENERGY MOVES OVER AR. MODELS INDICATE THE COLD FRONT WILL SLOWLY
MOVE EAST AFTER SUNSET WITH PLENTY OF CONVECTION AHEAD OF IT. THE
FRONT IS EXPECTED TO BE IN EASTERN AR AROUND SUNRISE OR A BIT
EARLY ON THURSDAY. SOME ADDITIONAL ENERGY IS EXPECTED TO ROTATE
AROUND THE UPPER LOW AND WILL SEE SOME LIGHTER CONVECTION UNTIL
THE UPPER LOW AND TROUGH CLEAR THE STATE ON THURSDAY. TEMPS WILL
FALL QUICKLY BEHIND THE FRONT AND LOWER TO THE 50S AND EVEN SOME
40S IN NW AR BY THURSDAY AM. 60S OUT AHEAD OF THE FRONT. THURSDAY
WILL GRADUALLY BECOME DRY AND CLOUDS THIN FROM WEST TO EAST. SOME
CLOUDS WILL HOLD OVER NORTHERN AREAS THROUGH MUCH OF DAY. THEN DRY
WEATHER IS EXPECTED FRIDAY AND SATURDAY WITH MODERATING TEMPS BACK
TO NORMAL LEVELS ON SUNDAY.

&&

.LONG TERM...SUNDAY THROUGH WEDNESDAY

SUNDAY THROUGH WEDNESDAY...

SRLY FLOW WILL HAVE RETURNED TO THE REGION AT THE START OF THE LONG
TERM AS SFC HIGH PRESSURE MOVES EAST OF THE AREA. A WEAK UPPER WAVE
WILL PASS SOUTH OF THE AREA...WITH SOME SLIGHT POTENTIAL FOR PRECIP
FOR SRN SECTIONS OF THE STATE EARLY IN THE PERIOD. EARLY NEXT
WEEK...FLOW ALOFT WILL BE MAINLY FROM THE SW...WITH WARMING TEMPS
EXPECTED THROUGH ABOUT MID WEEK. PRECIP CHANCES WILL REMAIN FAIRLY
LOW THROUGH TUE. HOWEVER...A STORM SYSTEM WILL DEVELOP ACROSS THE
PLAINS DURING THE MIDDLE OF NEXT WEEK...WITH A COLD FRONT DROPPING
SOUTH TOWARDS AR WED. PRECIP CHANCES WILL INCREASE AS A
RESULT...MAINLY ACROSS NRN SECTIONS OF THE STATE BY THE END OF THE
FORECAST PERIOD.

&&

.PRELIMINARY POINT TEMPS/POPS...
BATESVILLE AR     46  60  38  62 /  80  20  10  10
CAMDEN AR         48  64  38  69 /  90  20  10  10
HARRISON AR       38  53  32  57 / 100  10  10  10
HOT SPRINGS AR    43  60  37  67 /  90  20  10  10
LITTLE ROCK   AR  47  62  40  66 /  80  20  10  10
MONTICELLO AR     55  65  42  69 / 100  40  10  10
MOUNT IDA AR      40  59  37  65 /  90  10  10  10
MOUNTAIN HOME AR  41  55  34  60 /  90  20  10  10
NEWPORT AR        51  62  40  62 / 100  30  10  10
PINE BLUFF AR     52  63  42  67 / 100  30  10  10
RUSSELLVILLE AR   41  58  37  63 /  90  10  10  10
SEARCY AR         49  61  39  64 /  80  20  10  10
STUTTGART AR      53  62  42  65 / 100  30  10  10
&&

.LZK WATCHES/WARNINGS/ADVISORIES...
LAKE WIND ADVISORY UNTIL 10 PM CDT THIS EVENING FOR ARKANSAS-
BAXTER-BOONE-BRADLEY-CALHOUN-CLARK-CLEBURNE-CLEVELAND-CONWAY-
DALLAS-DESHA-DREW-FAULKNER-FULTON-GARLAND-GRANT-HOT SPRING-
INDEPENDENCE-IZARD-JACKSON-JEFFERSON-JOHNSON-LINCOLN-LOGAN-
LONOKE-MARION-MONROE-MONTGOMERY-NEWTON-OUACHITA-PERRY-PIKE-POLK-
POPE-PRAIRIE-PULASKI-SALINE-SCOTT-SEARCY-SHARP-STONE-VAN BUREN-
WHITE-WOODRUFF-YELL.

&&

SHORT TERM...59 / LONG TERM...62
Hazardous weather outlook, Apr 10, 2:49 PM CDT, 2 hours 18 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE LITTLE ROCK AR
249 PM CDT WED APR 10 2013

ARZ003>007-012>016-021>025-030>034-037>047-052>057-062>069-111000-
ARKANSAS-BAXTER-BOONE-BRADLEY-CALHOUN-CLARK-CLEBURNE-CLEVELAND-
CONWAY-DALLAS-DESHA-DREW-FAULKNER-FULTON-GARLAND-GRANT-HOT SPRING-
INDEPENDENCE-IZARD-JACKSON-JEFFERSON-JOHNSON-LINCOLN-LOGAN-LONOKE-
MARION-MONROE-MONTGOMERY-NEWTON-OUACHITA-PERRY-PIKE-POLK-POPE-
PRAIRIE-PULASKI-SALINE-SCOTT-SEARCY-SHARP-STONE-VAN BUREN-WHITE-
WOODRUFF-YELL-
249 PM CDT WED APR 10 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR A LARGE PART OF ARKANSAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT

BREEZY SOUTHERLY WINDS WILL BE SEEN ACROSS PORTIONS OF ARKANSAS
ONCE AGAIN TODAY...WITH WINDS OF 15 TO 25 MPH EXPECTED AHEAD OF A
COLD FRONT TO THE WEST. SOME GUSTS OVER 3O MPH WILL ALSO BE
POSSIBLE.

A COLD FRONT WILL BEGIN SLOWLY SHIFTING EAST ACROSS ARKANSAS THIS
AFTERNOON. SHOWERS AND THUNDERSTORMS WILL BECOME LIKELY LATE THIS
AFTERNOON INTO THE EVENING HOURS AS THE FRONT INTERACTS WITH WARM
AND VERY MOIST AIR ALREADY IN PLACE. SOME STRONG TO SEVERE
THUNDERSTORMS WILL BE POSSIBLE...WITH DAMAGING WINDS AND LARGE
HAIL THE MAIN THREATS WITH THE STRONGEST STORMS. A FEW WEAK
TORNADOES MAY ALSO BE POSSIBLE AHEAD OF THE COLD FRONT.

LOCALIZED FLASH FLOODING WILL ALSO BE A THREAT WITH THIS COLD
FRONT AS IT GRADUALLY SHIFTS EAST ACROSS THE STATE LATE THIS
AFTERNOON AND THROUGH THIS EVENING. EXPECT WIDESPREAD RAINFALL
AMOUNTS OF 1 TO 2 INCHES...WITH LOCALLY HIGHER AMOUNTS OF OVER 3
INCHES POSSIBLE. EXPECT THE HEAVIEST RAINFALL TO BE ACROSS EASTERN
SECTIONS OF THE STATE.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THE COLD FRONT WILL BE MOVING EAST OF THE STATE THURSDAY
MORNING...WITH THE THREAT FOR HAZARDOUS WEATHER BECOMING VERY LOW
INTO NEXT WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND EVENING.

&&

VISIT NWS LITTLE ROCK ON THE WEB. GO TO HTTP://WEATHER.GOV AND
CLICK ON CENTRAL ARKANSAS.

62

In the hours before

Local storm report, Apr 10, 3:42 PM CDT, 1 hour 25 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
342 PM CDT WED APR 10 2013

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

0320 PM     HAIL             ATKINS                  35.24N 92.95W
04/10/2013  E0.75 INCH       POPE               AR   TRAINED SPOTTER

            THE REPORT TIME IS BASED OFF RADAR...AND WAS RELAYED BY
            BROADCAST MEDIA.

&&

57
Special weather statement, Apr 10, 3:44 PM CDT, 1 hour 23 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
344 PM CDT WED APR 10 2013

ARZ003-004-102105-
BOONE AR-MARION AR-
344 PM CDT WED APR 10 2013

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN BOONE AND
NORTHWESTERN MARION COUNTIES UNTIL 400 PM CDT...

AT 342 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 4 MILES SOUTHWEST OF CLARK HILL...OR 12 MILES
EAST OF HARRISON...MOVING NORTHEAST AT 55 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THIS STORM.

* LOCATIONS IMPACTED INCLUDE...
  WININGTON...          WILLIS...             PYATT...
  LEAD HILL...          LAKEWAY...            DODD CITY...
  DIAMOND CITY...       CLARK HILL...         BERGMAN...
  ZINC...               SOUTH LEAD HILL...    PEEL...
  MONARCH...            TATER KNOB...         SYCAMORE...
  SUGARLOAF KNOB...     SHORT MTN...          PINE MTN...

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

LAT...LON 3650 9267 3621 9284 3629 9305 3651 9294
TIME...MOT...LOC 2045Z 204DEG 50KT 3634 9290

56
Special weather statement, Apr 10, 3:51 PM CDT, 1 hour 16 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
351 PM CDT WED APR 10 2013

ARZ022-031-038-039-102120-
CONWAY AR-PERRY AR-POPE AR-YELL AR-
351 PM CDT WED APR 10 2013

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN YELL...SOUTHERN
POPE...WESTERN PERRY AND SOUTHWESTERN CONWAY COUNTIES UNTIL 415 PM
CDT...

AT 346 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR NIMROD LAKE...OR 11 MILES SOUTHEAST OF
DANVILLE...MOVING NORTHEAST AT 50 MPH.

HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM.

* LOCATIONS IMPACTED INCLUDE...
  RUSSELLVILLE...       DARDANELLE...         TARAL...
  POTTSVILLE...         PLAINVIEW...
  PETIT JEAN RIVER WMA...                     OLA...
  NIMROD LAKE...        MOSLEY...             LAKE ATKINS...
  GALLA CREEK WMA...    DOVER...
  DARDANELLE LOCK AND DAM...                  CARDEN BOTTOMS...
  ATKINS...             PONTOON...            MORELAND...
  GUM LOG...

THIS INCLUDES INTERSTATE 40 BETWEEN MILE MARKERS 78 AND 96.

THIS STORM MAY INTENSIFY....AND A TORNADO WATCH IS IN EFFECT FOR THIS
AREA. BE CERTAIN TO MONITOR LOCAL RADIO AND TV STATIONS...AS WELL AS
LOCAL CABLE TV OUTLETS....FOR ADDITIONAL INFORMATION AND POSSIBLE
WARNINGS FROM THE NATIONAL WEATHER SERVICE.

LAT...LON 3543 9316 3531 9284 3491 9313 3499 9333
TIME...MOT...LOC 2051Z 205DEG 42KT 3503 9319

224
Local storm report, Apr 10, 4:05 PM CDT, 1 hour 2 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
405 PM CDT WED APR 10 2013

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

0359 PM     TSTM WND DMG     WONDERVIEW              35.32N 92.73W
04/10/2013                   CONWAY             AR   AMATEUR RADIO

            A ROOF WAS BLOWN OFF A BARN. A FUNNEL CLOUD WAS
            SIGHTED...SO THIS MAY BE A BRIEF TORNADO TOUCHDOWN.

&&

28
Local storm report, Apr 10, 4:31 PM CDT, 36 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
431 PM CDT WED APR 10 2013

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

0421 PM     TORNADO          SCOTLAND                35.52N 92.62W
04/10/2013                   VAN BUREN          AR   LAW ENFORCEMENT

            LAW ENFORCEMENT HAS REPORTED A TORNADO ON THE GROUND IN
            SCOTTLAND.

&&

224
Local storm report, Apr 10, 4:56 PM CDT, 11 minutes before
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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.

Springfield, MO (KSGF), 12:00Z

10.1 hours before the tornado, 185 km from the path. April 10, 2013.

Skew-T log-pSkew-T log-p diagram, Springfield, MO at 12:00Z on 2013-04-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 268 joules per kilogram, CIN -83, lifted condensation level 507 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, Springfield, MO at 12:00Z on 2013-04-10The 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 145 square meters per square second, 0 to 6 km bulk shear 50 knots.19395878Sfc1 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
268 J/kg
Mixed-layer CIN
-83 J/kg
Surface CAPE
0 J/kg
Mixed-layer LCL
507 m above ground
0-6 km bulk shear
50 kt
0-1 km bulk shear
26 kt
0-1 km storm-relative helicity
145 m²/s²
0-3 km storm-relative helicity
194 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.2
0-3 km lapse rate
4.3 K/km

Open this sounding in Storm Lab

The surface observations

Clinton (CCA), 26 km from the path, in the two hours either side.

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

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

The radar

The Little Rock radar (KLZK), 105 km away, was scanning. The volume nearest the touchdown began at 22:05 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 2013 tornado in ArkansasEvery tornado in Arkansas since 1950Warnings in force in Arkansas nowThe forecast where you are

The other tornadoes of April 10, 2013

8 more were confirmed in the United States that day.

DateTimeRatingWherePath (mi)Width (yd)DeathsInjuriesDamage
April 104:20 PM CDTEF2Van Buren, AR17.38005$3.5 million
April 105:44 PM CDTEF2Izard, AR1.2100$350,000
April 107:38 PM CDTEF1Franklin, MO1.3200
April 108:00 PM CDTEF2Saint Louis, MO6.85002$4.0 million
April 108:10 PM CDTEF0City of Saint Louis, MO0.350
April 108:26 PM CDTEF1Lincoln, AR6.7400$500,000
April 108:58 PM CDTEF0Butler, MO1.775$20,000
April 109:05 PM CDTEF0Stoddard, MO1.550$40,000

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.