Back-to-back powerful Pacific storm systems to impact the Pacific Northwest and northern California through the end of this week with heavy rain, flooding, strong winds, and higher elevation mountain snow. A strong, long-duration atmospheric river will accompany the Pacific storms, bringing excessive rainfall and flash flooding to southwest Oregon and northwest California through the week. Read More >
Overview
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Conditions were favorable for severe thunderstorms during the afternoon of June 1st, 2018, as a warm and very unstable air mass over South Dakota interacted with a cold front. An area of low pressure in northwest South Dakota that morning moved northeast into central North Dakota, dragging a cold front east across South Dakota. Thunderstorms developed ahead of the front and to the west of the Missouri River, producing strong winds and very large hail. There were several reports of hail larger than golf balls around Timber Lake and between 1-1.5” hail in eastern Corson County. As the storms moved east, additional smaller reports of hail were reported in Walworth County, along with a brief tornado near Glenham. Leading up to the event, conditions were warm and generally dry in the James River Valley during May. Those conditions combined with strong winds from decaying thunderstorms in south central South Dakota to produce a dust storm. South winds of 50 to 80 mph kicked up a significant amount of dirt/dust as the winds moved north, leading to visibilities being reduced to below ¼ mile in many locations. The reduced visibilities caused a few traffic incidents and the winds knocked down trees, tree branches, and powerlines. |
 Surface Map from 7am June 1 to 7am June 2, 2018 |
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Severe Storms:
Large hail was produced in a storm over northern Dewey county. The largest measured stones were up to 2" in diameter.
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Three miles south of Timber Lake, SD. Photo courtesy of Nina Schumacher |
Timber Lake, SD Photo courtesy of Grady Kraft |
Timber Lake, SD Photo courtesy of Austin Stover |
Timber Lake, SD Photo courtesy of Kyle Nilson |
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Severe storm in Corson County. Photo from NWS Employee |
Smoke from a fire likely sparked by a lightning strike near Mobridge. Photo from NWS Employee |
Tornado 5 miles southeast of Glenham Photo Courtesy of Spencer Gosh |
Scud cloud developing in the shape of a funnel in Corson County Photo from NWS Employee |
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Cumulonimbus in Corson County. Photo from NWS Employee |
Dust Storm
An outflow boundary ahead of a line of thunderstorms led to winds gusting as high as 80 mph. Due to the high winds and very dry soils, dust storms were seen across parts of northeastern and north central South Dakota. Visibility was reduced to less than 1/4 mile in localized areas.
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Five miles northwest of Aberdeen Photo courtesy of Maggie and Ryan Jett |
RWIS Site 1 mile west northwest of Mellette |
RWIS site 17 miles north of Polo |
RWIS site 5 miles south of Miranda at 7:53 pm |
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4 miles north of Cresbard during the dust storm. Photo courtesy of John Batteen |
Near Ipswich Photo from NWS Employee |
Time lapse of dust in at the NWS Aberdeen office from 8:40 to 9:30 pm |
Detailed radar analysis of dust and other features on radar from 7-10 pm
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Storm Reports
Local Storm Reports from evening of June 1, 2018 ..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON... ..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.... ..REMARKS.. 0840 PM Hail Java 45.50N 99.89W 06/01/2018 E1.00 inch Walworth SD Law Enforcement 0759 PM Tstm Wnd Gst 2 E Lowry 45.31N 99.94W 06/01/2018 M56 MPH Walworth SD Mesonet 0730 PM Hail 3 SW Glenham 45.49N 100.31W 06/01/2018 E1.00 inch Walworth SD Public 0800 PM Non-Tstm Wnd Gst Chelsea 45.16N 98.75W 06/01/2018 E60 MPH Faulk SD Trained Spotter Estimated 60 mph winds and blowing dust. Visibility reduced below a quarter mile. 0602 PM Hail 9 ENE Timber Lake 45.49N 100.92W 06/01/2018 M1.50 inch Corson SD Public LIKELY LARGER STONES IN YARD. 0630 PM Hail Trail City 45.47N 100.73W 06/01/2018 M1.50 inch Corson SD Public 0552 PM Hail 3 E Bullhead 45.77N 101.02W 06/01/2018 E1.25 inch Corson SD Public Radar estimated time. 0640 PM Tstm Wnd Gst 1 SSE Mahto 45.74N 100.66W 06/01/2018 E62 MPH Corson SD Mesonet From SDSU mesonet site near Mahto. 0926 PM Non-Tstm Wnd Gst Aberdeen Rgnl AP 45.46N 98.41W 06/01/2018 M58 MPH Brown SD ASOS Blowing dust causing reduced visibility to a mile or less at times, ASOS station ABR, Aberdeen Rgnl AP. 0655 PM Hail 3 WSW Indian Creek Rec 45.50N 100.44W 06/01/2018 E1.00 inch Corson SD Law Enforcement 0704 PM Non-Tstm Wnd Gst 1 NE Hayes 44.38N 101.02W 06/01/2018 M68 MPH Stanley SD Mesonet Winds are from an outflow boundary. 0715 PM Hail 1 SW Indian Memorial Re 45.56N 100.50W 06/01/2018 E0.50 inch Corson SD Trained Spotter REPORTED AT GRAND RIVER CASINO & RESORT. 0736 PM Tornado Glenham 45.53N 100.27W 06/01/2018 Walworth SD Public Law enforcement relayed a public report of a brief tornado northeast of Glenham. 0744 PM Tstm Wnd Gst 16 W Polo 44.78N 99.44W 06/01/2018 M62 MPH Hyde SD Mesonet 0759 PM Tstm Wnd Gst 2 ENE Pierre 44.38N 100.28W 06/01/2018 M65 MPH Hughes SD ASOS 0635 PM Hail 3 NNE Little Eagle 45.72N 100.76W 06/01/2018 E1.00 inch Corson SD Public WINDS ESTIMATED AT 65 TO 70 MPH. 0520 PM Hail 5 E Timber Lake 45.43N 100.97W 06/01/2018 E1.75 inch Dewey SD Law Enforcement 0820 PM Tstm Wnd Gst 2 N Mansfield 45.27N 98.56W 06/01/2018 E46 MPH Brown SD Trained Spotter Visibility reduced to 1/2 mile. 0834 PM Tstm Wnd Gst 1 WNW Mellette 45.16N 98.51W 06/01/2018 M74 MPH Spink SD Mesonet 0510 PM Hail 2 NNE Little Moreau Rec 45.38N 101.07W 06/01/2018 M2.00 inch Dewey SD Public ACTUAL MEASUREMENT WAS TWO AND A QUARTER INCH. 0845 PM Tstm Wnd Gst 1 S Chelsea 45.15N 98.74W 06/01/2018 E80 MPH Faulk SD Trained Spotter 1/8 mile visibility in blowing dust, tree toppled. 0900 PM Dust Storm 1 WNW Ashton 45.00N 98.51W 06/01/2018 Spink SD Law Enforcement Traffic accident due to reduced visibility from blowing dust. 0903 PM Tstm Wnd Gst 1 SSW Richmond Lake Rec 45.53N 98.62W 06/01/2018 E45 MPH Brown SD Public 100 feet visibility in blowing dust. 0903 PM Dust Storm 2 NW Aberdeen 45.49N 98.52W 06/01/2018 Brown SD Public Reduced visibility due to blowing dust. 0912 PM Non-Tstm Wnd Gst Aberdeen 6.5 W 45.47N 98.62W 06/01/2018 M62 MPH Brown SD Mesonet Mesonet station E2245, Aberdeen 6.5 W. 0914 PM Non-Tstm Wnd Gst Aberdeen 7 W 45.47N 98.64W 06/01/2018 M60 MPH Brown SD Mesonet Mesonet station E5307, Aberdeen 7 W. 0917 PM Dust Storm 2 SSE Richmond Lake Rec 45.52N 98.60W 06/01/2018 Brown SD Trained Spotter Car in ditch due to reduced visibility from dust storm. 0944 PM Non-Tstm Wnd Dmg Richmond Lake Rec Area 45.55N 98.62W 06/01/2018 Brown SD Law Enforcement Downed power lines caused trees to start on fire.
Rain Reports (Radar Estimated)
On the heals of the 7th driest May on record in Aberdeen (0.52"), only a trace of rain was measured at the airport on June 1st. Rain gauges had more dust than rain in/on them at Mina.
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