Overview
An unseasonable strong storm system and rich moisture from the Gulf of Mexico produced severe thunderstorms across the Missouri Ozarks during the afternoon and evening hours of August 19th, 2018. A total of eight tornadoes were confirmed including six EF-0 tornadoes and two EF-1 tornadoes. The tornadoes near Diggins, Aurora, and Ritchey, Missouri were produced by low-topped (or mini) supercell thunderstorms. In contrast, the tornadoes over northern Barton and southern Vernon Counties in Missouri were associated with a line of thunderstorms referred to as a quasi-linear convective system (QLCS).
Tornadoes:
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Tornado - Diggins
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Tornado - Verdella
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Tornado - Southeast Sheldon
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Tornado - Sheldon
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Tornado - North Milford
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Tornado - South of Aurora
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Tornado - 4 NNE Ritchey MO
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Tornado - 5 WNW Jerico Springs MO
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The Enhanced Fujita (EF) Scale classifies tornadoes into the following categories:
EF0 Weak 65-85 mph |
EF1 Moderate 86-110 mph |
EF2 Significant 111-135 mph |
EF3 Severe 136-165 mph |
EF4 Extreme 166-200 mph |
EF5 Catastrophic 200+ mph |
Radar:
Reflectivity and storm relative motion radar images of low-topped supercell producing a tornado near Aurora, MO. | Reflectivity and storm relative motion radar images of line of thunderstorms around time of tornado just southeast of Sheldon, MO. | Radar detecting debris in the air near Sheldon, MO. | Reflectivity and storm relative motion radar images of line of thunderstorms around time of tornado near Verdella, MO. |
Storm Reports
PRELIMINARY LOCAL STORM REPORT...SUMMARY NATIONAL WEATHER SERVICE SPRINGFIELD MO 629 PM CDT MON AUG 20 2018 ..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON... ..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.... ..REMARKS.. 0332 PM TORNADO 1 S DIGGINS 37.15N 92.85W 08/19/2018 WEBSTER MO NWS STORM SURVEY NWS STORM SURVEY FOUND LIMITED DAMAGE TO LIMBS AND ONE UPROOTED TREE WITHIN THE REGION WHERE SPOTTERS REPORTED DEBRIS AND ROTATION IN THE AIR. PATH FROM SPOTTERS EXTENDED FROM NN NORTHEASTWARD ACROSS HIGHWAY 60 NEAR BONNET RD WHERE DEBRIS WAS REPORTED TO HAVE BLOCKED THE HIGHWAY, CONTINUING TO NEAR THE FARM AUCTION BARN, AND ENDING APPROXIMATELY NEAR GENTRY ROAD AND THE JAMES RIVER. TIME ESTIMATED BY RADAR. ESTIMATED BY RADAR. 0447 PM TSTM WND GST 3 WNW REEDS 37.14N 94.21W 08/19/2018 E60 MPH JASPER MO TRAINED SPOTTER CORRECTS PREVIOUS TSTM WND GST REPORT FROM 3 WNW REEDS. 0540 PM TORNADO VERDELLA 37.61N 94.43W 08/19/2018 BARTON MO NWS STORM SURVEY CORRECTS PREVIOUS TSTM WND GST REPORT FROM VERDELLA TO A TORNADO REPORT. NWS STORM SURVEY REPORTED A BRIEF EF-0 TORNADO TOUCHDOWN THAT BLEW OVER A CENTER-PIVOT IRRIGATION SYSTEM IN A FARM FIELD OFF OF WEST HWY V IN VERDELLA. TIME ESTIMATED FROM RADAR. 0554 PM TORNADO 3 SE SHELDON 37.63N 94.26W 08/19/2018 BARTON MO NWS STORM SURVEY A BRIEF EF-0 TORNADO TOUCHED DOWN NEAR THE INTERSECTION OF NE 90TH ROAD AND NE 20TH LANE. MAX WINDS ESTIMATED AT 61 MPH, WIDTH OF 25 YARDS, AND A PATH LENGTH OF 0.1 MILES. THERE WERE LARGE BRANCHES BROKEN. STARTED AT 5:54 PM AND ENDED AROUND 5:55 PM. TIME ESTIMATED FROM RADAR. 0557 PM TORNADO 2 ESE SHELDON 37.65N 94.27W 08/19/2018 VERNON MO NWS STORM SURVEY EF-1 TORNADO STARTING 1.5 SE OF SHELDON, MO WITH DAMAGE TO FARM OUTBUILDINGS. THE TORNADO CONTINUED ON THE GROUND FOR 2 MINUTES TO THE NORTHEAST UPROOTING TREES ALONG THE TORNADO PATH BEFORE LIFTING 1 E OF SHELDON, MO. MAX WINDS ESTIMATED AT 95 MPH, WIDTH OF 75 YARDS, AND DISTANCE OF 1.0 MILES. STARTED AT 5:57 PM AND ENDED AROUND 5:59 PM. 0559 PM TORNADO 3 NNW MILFORD 37.63N 94.18W 08/19/2018 BARTON MO NWS STORM SURVEY A BRIEF EF-0 TORNADO TOUCHED DOWN NEAR HWY N MO-A. THE TORNADO WAS SHORT-LIVED LASTING NEARLY 2 MINUTES BEFORE ENDING NEAR THE INTERSECTION OF HWY N MO-A AND NE 90TH ROAD. MAX WINDS ESTIMATED AT 74 MPH, WIDTH OF 25 YARDS, AND A PATH LENGTH OF 0.16 MILES. THERE WERE LARGE TREE LIMBS BROKEN ALONG THE SHORT PATH. STARTED AT 5:59 PM AND ENDED AROUND 6:01 PM. TIME ESTIMATED FROM RADAR. 0628 PM TORNADO 1 NW MCDOWELL 36.84N 93.81W 08/19/2018 BARRY MO TRAINED SPOTTER CORRECTS PREVIOUS TORNADO REPORT FROM 1 NW MCDOWELL. SPOTTER CONFIRMS TORNADO ON THE GROUND 3 MILES SOUTH OF AURORA, MO. 0636 PM TORNADO 7 S AURORA 36.88N 93.74W 08/19/2018 BARRY MO NWS STORM SURVEY CORRECTS PREVIOUS TORNADO REPORT FOR 1 WNW OF MADRY. EF1 TORNADO STARTING JUST SOUTHWEST OF HWY Z AND 39 APPROXIMATELY 7 MILES SOUTH OF AURORA AND ENDING 1.5 MILES SOUTHWEST OF MARIONVILLE. MAX WINDS ESTIMATED 90MPH, WIDTH 100 YARDS AND DISTANCE 9 MILES. NUMEROUS OUTBUILDINGS DAMAGED, TREES UPROOTED, SOME POWER LINES DOWN, AND TWO MOBILE HOMES WITH PARTIAL ROOFS REMOVED. STARTED AT 6:36 PM AND ENDED AROUND 7:01 PM. 0657 PM TORNADO 4 S MARIONVILLE 36.95N 93.63W 08/19/2018 LAWRENCE MO TRAINED SPOTTER TORNADO ON THE GROUND AND DAMAGE NEAR FARM ROAD 2230 EAST OF HIGHWAY 39. 0703 PM TSTM WND DMG 2 WSW REPUBLIC 37.11N 93.51W 08/19/2018 GREENE MO PUBLIC MULTIPLE TREE LIMBS DOWN WITH MINOR DAMAGE TO OUTBUILDINGS. TIME ESTIMATED BY RADAR. 0721 PM TSTM WND DMG 1 SSW REPUBLIC 37.10N 93.49W 08/19/2018 GREENE MO TRAINED SPOTTER SPOTTER REPORTS DOWNED POWER LINES AT THE INTERSECTION OF SOUTH ILLINOIS AVE AND MELODY LANE SOUTHWEST OF REPUBLIC. SPOTTER ALSO SEES SEVERAL LARGE TREE BRANCHES, AND SMALL TREE BLOWN DOWN IN THAT SAME AREA. 6-10" IN DIAMETER. TIME ESTIMATED FROM RADAR. 0723 PM TSTM WND GST 1 WSW REPUBLIC 37.12N 93.50W 08/19/2018 E60 MPH GREENE MO TRAINED SPOTTER SPOTTER REPORTED AN ESTIMATED 60MPH WIND GUST AND A LARGE TREE DOWN BLOCKING A ROADWAY. TIME ESTIMATED FROM RADAR. 0726 PM TSTM WND DMG 1 S BOLIVAR 37.60N 93.41W 08/19/2018 POLK MO PUBLIC LARGE TREE LIMB DOWN ON CAR. TIME ESTIMATED BY RADAR. 0729 PM TSTM WND DMG 4 S HALF WAY 37.56N 93.25W 08/19/2018 POLK MO EMERGENCY MNGR REPORT OF BARN ROOF BLOWN OFF AT SOUTH 210TH AND HIGHWAY YY. 0940 PM TSTM WND DMG 5 SE HARTVILLE 37.18N 92.46W 08/19/2018 WRIGHT MO PUBLIC OUTBUILDING DESTROYED, SIDING DISLODGED ON HOUSE, OTHER DEBRIS THROWN ABOUT.
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