A series of Bering Sea storms will impact western Alaska this week, with elevated water levels, isolated coastal flooding, high surf, erosion, and strong winds. Heavy rain and snow are also expected for the West Coast into Interior Alaska. A multi-day flash flooding threat is forecast across parts of the southern High Plains and Southwest through the weekend. Surf remains high for Florida. 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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