Lake-effect snow will continue downwind of Lakes Erie and Ontario through Friday. In the Western U.S., rain and higher elevation snow will continue over the Great Basin through Friday. A front will move over the Pacific Northwest Thursday afternoon and produce light rain and higher elevation snow over the Cascades through Saturday. Read More >
Overview
Low pressure moved across the region triggering storms shortly before 5 PM CDT. Some of these storms became severe and produced two confirmed EF-0 tornadoes, as well as hail larger than tea cups (3"). One of the tornadoes lasted for nine minutes and caused minor damage to the west side of a ranch 18.4 miles NNW of Highmore. The tornado also flattened about a half mile of corn stalks with a maximum path width of 50 yards.
Tornadoes:
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Tornado - 18.4 miles NNW of Highmore
Track Map  
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Tornado - 19.0 miles N of Highmore, SD
Track Map  |
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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 |
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Photos & Video:
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| Tornado over northern Hyde County, courtesy of Staci and Oliver Aesoph | Tornado over northern Hyde County, courtesy of Staci and Oliver Aesoph | Tornado over northern Hyde County, courtesy of Staci and Oliver Aesoph | Funnel cloud captured by a Northern Hyde resident |
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| Tornado path through a corn field in northern Hyde County, courtesy of Staci and Oliver Aesoph | Wall cloud near Orient, courtesy of Derek Thompson | Cumulonimbus cloud south of Seneca, courtesy of Derek Thompson | Shelf cloud near Redfield, courtesy of Alex Resel |
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| Tornado path through a corn field in northern Hyde County, with person for size perspective | Thunderstorm over Redfield, courtesy of Alex Resel | Very large hail observed 4 miles NW of Hoven, courtesy of Derek Rausch | Very large hail observed 4 miles NW of Hoven, courtesy of Derek Rausch |
Radar:
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| Radar reflectivity event overview from 4:50 to 10:00 PM | Radar reflectivity/storm relative velocity at 6:18 pm, at the start of the tornado 18.4 mi NNW of Highmore | Radar reflectivity/storm relative velocity at 6:29 pm during the time of the tornado 19.2 mi N of Highmore | Radar reflectivity of the 3" hail-producing left-splitting supercell 4 mi NW of Hoven at 6:03 pm |
Rainfall, Storm Reports
Radar estimated rainfall totals
Rainfall Reports
LOCATION AMOUNT TIME/DATE POLO 7 W 2.30 IN 0817 PM 08/23 EUREKA 13 ENE 2.09 IN 1215 PM 08/24 ORIENT 1.91 IN 0800 AM 08/24 MANSFIELD 1.74 IN 0700 AM 08/24 WEBSTER 1.30 IN 0800 AM 08/24 WALKER 1 W 1.20 IN 0800 AM 08/24 HERREID 3 ESE 1.05 IN 0700 AM 08/24 4 W ROCKHAM 1.05 IN 0700 AM 08/24 MELLETTE 1.04 IN 1000 AM 08/24 BATH 5 SSW 1.01 IN 0700 AM 08/24 MOBRIDGE 8 NNW 0.92 IN 0800 AM 08/24 EUREKA 11 WSW 0.87 IN 0700 AM 08/24 FAULKTON 1 NW 0.87 IN 0800 AM 08/24 GROTON 0.78 IN 1241 PM 08/24 LEOLA 9 W 0.74 IN 1205 PM 08/24 HIGHMORE 12 N 0.72 IN 0700 AM 08/24 2 SE ROSLYN 0.66 IN 0600 AM 08/24 ROSCOE 6 W 0.65 IN 0800 AM 08/24 1 NE ABERDEEN 0.62 IN 0700 AM 08/24 MOBRIDGE 0.61 IN 0800 AM 08/24 SELBY 0.60 IN 1250 PM 08/24 ABERDEEN 1 WSW 0.60 IN 0700 AM 08/24 LILY 6 ENE 0.55 IN 0700 AM 08/24 EUREKA 0.5 S 0.54 IN 1254 PM 08/24 BATH 1 NE 0.54 IN 0800 AM 08/24 EUREKA 0.53 IN 0800 AM 08/24 LEOLA 0.53 IN 0700 AM 08/24 EUREKA 0.53 IN 0800 AM 08/24 GRENVILLE 6 ENE 0.51 IN 0800 AM 08/24 HECLA 5 NE 0.50 IN 0700 AM 08/24 GRENVILLE 7 ENE 0.48 IN 0800 AM 08/24 BRITTON 0.46 IN 0700 AM 08/24 MOBRIDGE MUNI AP 0.46 IN 0652 AM 08/24 EUREKA 0.44 IN 1250 PM 08/24 SISSETON 3 W 0.44 IN 0700 AM 08/24 SISSETON 3 W 0.44 IN 0700 AM 08/24 SELBY 4 W 0.43 IN 0800 AM 08/24 ANDOVER 0.40 IN 1200 PM 08/24 ABERDEEN 1 SSW 0.38 IN 0700 AM 08/24 ABERDEEN RGNL AP 0.36 IN 0653 AM 08/24 SISSETON MUNI AP 0.36 IN 0656 AM 08/24 OKATON 3 NW 0.35 IN 0730 AM 08/24 LAKE CITY 4 SE 0.34 IN 0700 AM 08/24 BROWNS VALLEY 6 N 0.33 IN 0700 AM 08/24 HIGHMORE 19 NNW 0.33 IN 0700 AM 08/24 MILLER 0.32 IN 0721 AM 08/24 EUREKA 15 SE 0.31 IN 0900 AM 08/24 1 ESE ABERDEEN 0.31 IN 0700 AM 08/24 KIDDER 0.30 IN 0700 AM 08/24 CLAREMONT 2 SSE 0.29 IN 0600 AM 08/24 ASHTON 0.29 IN 1245 PM 08/24 ABERDEEN 0.5 SE 0.28 IN 1247 PM 08/24 SELBY 0.27 IN 0700 AM 08/24 ABERDEEN 6.5 W 0.27 IN 1245 PM 08/24 BATH 4 WNW 0.27 IN 0700 AM 08/24 ABERDEEN 0.5 NW 0.26 IN 1252 PM 08/24 HIGHMORE 17 N 0.26 IN 0800 AM 08/24 PRESHO 7 N 0.26 IN 0800 AM 08/24 VIVIAN 7 NW 0.26 IN 1105 AM 08/24 MINA 7 S 0.25 IN 0800 AM 08/24 ROSCOE 0.25 IN 0700 AM 08/24 FREDERICK 9 W 0.24 IN 1230 PM 08/24 LOYALTON 5 NE 0.23 IN 1255 PM 08/24 WESTOVER 2 SSW 0.23 IN 0900 AM 08/24 VEBLEN 8 W 0.22 IN 0700 AM 08/24 LITTLE EAGLE 1 SW 0.20 IN 1215 PM 08/24 ABERDEEN 0.5 E 0.20 IN 1245 PM 08/24 ABERDEEN 7.5 NNE 0.19 IN 0700 AM 08/24 LOYALTON 5 NE 0.19 IN 0700 AM 08/24 CHELSEA 1 S 0.17 IN 0700 AM 08/24 WESTPORT 2 NW 0.15 IN 0600 AM 08/24 FREDERICK 8 SW 0.14 IN 0700 AM 08/24 MINA 2 NE 0.14 IN 0600 AM 08/24 VIVIAN 5 SSW 0.14 IN 0800 AM 08/24 BARNARD 5 W 0.13 IN 1252 PM 08/24 VIVIAN 4 N 0.13 IN 0800 AM 08/24 HILLHEAD 3 WSW 0.13 IN 1159 AM 08/24 GANN VALLEY 0.12 IN 0800 AM 08/24 HECLA 7 WNW 0.11 IN 0800 AM 08/24 MINA 0.10 IN 0800 AM 08/24 PIERRE MUNI AP 0.03 IN 0653 AM 08/24
Storm Reports: https://www.spc.noaa.gov/climo/gmf.php?rpt=180823_rpts_filtered
Listing of Reports
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0603 PM HAIL 3 NW HOVEN 45.28N 99.83W
08/23/2018 M3.00 INCH WALWORTH SD PUBLIC
REPORT WITH PHOTOS. RADAR ESTIMATED TIME.
0601 PM HAIL 2 N HOVEN 45.27N 99.78W
08/23/2018 E1.75 INCH WALWORTH SD PUBLIC
MOST HAILSTONES WERE AROUND NICKLE SIZED,
BUT A COUPLE TO GOLF BALL DIAMETER WERE ALSO
OBSERVED. RADAR ESTIMATED TIME.
0531 PM HAIL 5 W LEBANON 45.07N 99.87W
08/23/2018 E1.75 INCH POTTER SD PUBLIC
0716 PM HAIL 1 W WALKER 45.91N 101.11W
08/23/2018 E1.25 INCH CORSON SD TRAINED SPOTTER
MOSTLY SMALLER WITH A FEW HAILSTONES TO HALF
DOLLAR SIZE, 1.20 INCHES OF RAIN. RADAR
ESTIMATED TIME.
0700 PM HAIL 6 E MCINTOSH 45.92N 101.23W
08/23/2018 E1.25 INCH CORSON SD PUBLIC
0747 PM HAIL 3 SW POLO 44.75N 99.15W
08/23/2018 E1.00 INCH HAND SD TRAINED SPOTTER
2.50 INCHES OF RAIN AND CROP DAMAGE AS WELL.
0817 PM HEAVY RAIN 7 W POLO 44.78N 99.25W
08/23/2018 M2.30 INCH HAND SD LAW ENFORCEMENT
0815 AM HEAVY RAIN EUREKA 13 ENE 45.88N 99.41W
08/24/2018 M2.09 INCH MCPHERSON SD MESONET
MESONET STATION LLKS2, EUREKA 13 ENE.
0800 AM HEAVY RAIN ORIENT 44.90N 99.09W
08/24/2018 M1.91 INCH FAULK SD PUBLIC
0700 AM HEAVY RAIN MANSFIELD 45.24N 98.56W
08/24/2018 M1.74 INCH BROWN SD COCORAHS
COCORAHS STATION SD-BR-12, MANSFIELD.
0800 AM HEAVY RAIN WEBSTER 45.33N 97.53W
08/24/2018 M1.30 INCH DAY SD CO-OP OBSERVER
CO-OP OBSERVER STATION WBRS2, WEBSTER.
0700 AM HEAVY RAIN HERREID 3 ESE 45.82N 100.01W
08/24/2018 M1.05 INCH CAMPBELL SD COCORAHS
COCORAHS STATION SD-CP-6, HERREID 3 ESE.
0700 AM HEAVY RAIN 4 W ROCKHAM 44.90N 98.90W
08/24/2018 M1.05 INCH FAULK SD COCORAHS
COCORAHS STATION SD-FK-3, 4 W ROCKHAM.
1000 AM HEAVY RAIN MELLETTE 45.15N 98.50W
08/24/2018 M1.04 INCH SPINK SD PUBLIC
RELAYED VIA SOCIAL MEDIA.
0700 AM HEAVY RAIN BATH 5 SSW 45.39N 98.37W
08/24/2018 M1.01 INCH BROWN SD COCORAHS
COCORAHS STATION SD-BR-23, BATH 5 SSW.
0629 PM TORNADO 19 S SENECA 44.79N 99.50W
08/23/2018 HYDE SD NWS STORM SURVEY
A BRIEF TORNADO OCCURRED IN AN OPEN FIELD ON
THE NORTH SIDE OF 180TH STREET. NO DAMAGE
FOUND.
0618 PM TORNADO 18 N HOLABIRD 44.77N 99.54W
08/23/2018 HYDE SD NWS STORM SURVEY
TORNADO STARTED ON WEST SIDE OF A RANCH,
CAUSING MINOR DAMAGE. IT TRACKED TO THE
NORTHEAST FOR 1.82 MILES AND HAD A MAXIMUM
PATH WIDTH OF 50 YARDS. CORN STALKS WERE
FLATTENED FOR A HALF MILE BEFORE THE TORNADO
DISSIPATED IN A OPEN FIELD.
RADAR ESTIMATED TIME.
0651 PM TSTM WND GST 2 S MURDO 43.86N 100.71W
08/23/2018 M70 MPH JONES SD MESONET
UPDATES PREVIOUS TSTM WND GST REPORT FROM 2
S MURDO.
0735 PM TSTM WND GST 13 N VIVIAN 44.12N 100.29W
08/23/2018 M62 MPH LYMAN SD MESONET
RADAR ESTIMATED TIME.
0743 PM TSTM WND GST 11 SSW PRESHO 43.75N 100.14W
08/23/2018 E60 MPH LYMAN SD TRAINED SPOTTER
50-60 MPH WIND GUST. RADAR ESTIMATED TIME.
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