Alert archive / South Dakota / Severe Thunderstorm Watches in 2018

Severe Thunderstorm Watch 164

June 8, 201814 counties in Nebraska; 21 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jun 8, 2018, 5:55 PM CDT for 14 counties in Nebraska; 21 counties in South Dakota. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jun 8, 2018, 5:55 PM CDT (22:55 UTC)
Expired
Jun 9, 2018, 1:00 AM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
60 kt
All 35 counties

Blaine County, NE, Boyd County, NE, Brown County, NE, Cherry County, NE, Garfield County, NE, Grant County, NE, Holt County, NE, Hooker County, NE, Keya Paha County, NE, Loup County, NE, Rock County, NE, Sheridan County, NE, Thomas County, NE, Wheeler County, NE, Aurora County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hughes County, SD, Hutchinson County, SD, Jerauld County, SD, Jones County, SD, Lake County, SD, Lyman County, SD, McCook County, SD, Mellette County, SD, Miner County, SD, Sanborn County, SD, Stanley County, SD, Todd County, SD, Tripp County, SD

The radar

The North Platte radar (KLNX), 88 km from the middle of the area, began a volume at 22:55 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
20%
One or more EF2 to EF5 tornadoes
2%
Ten or more severe wind reports
60%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
60%
One or more hailstones of 2 inches or more
40%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

26 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jun 8, 5:57 PM CDTSevere Thunderstorm WarningUNRJackson, Mellette63 min
Jun 8, 6:34 PM CDTSevere Thunderstorm WarningUNRBennett, Mellette, Todd56 min
Jun 8, 7:04 PM CDTSevere Thunderstorm WarningUNRBennett, Todd56 min
Jun 8, 7:26 PM CDTSevere Thunderstorm WarningUNRBennett, Mellette, Todd64 min
Jun 8, 7:44 PM CDTSevere Thunderstorm WarningLBFCherry46 min
Jun 8, 7:54 PM CDTSevere Thunderstorm WarningUNRBennett, Todd66 min
Jun 8, 8:20 PM CDTSevere Thunderstorm WarningUNRMellette, Todd, Tripp55 min
Jun 8, 8:25 PM CDTSevere Thunderstorm WarningLBFCherry50 min
Jun 8, 8:25 PM CDTSevere Thunderstorm WarningABRJones, Lyman50 min
Jun 8, 8:28 PM CDTSevere Thunderstorm WarningLBFCherry62 min
Jun 8, 8:47 PM CDTSevere Thunderstorm WarningLBFCherry, Sheridan58 min
Jun 8, 9:02 PM CDTSevere Thunderstorm WarningLBFSheridan58 min
Jun 8, 9:04 PM CDTSevere Thunderstorm WarningABRLyman26 min
Jun 8, 9:14 PM CDTSevere Thunderstorm WarningLBFCherry46 min
Jun 8, 9:14 PM CDTSevere Thunderstorm WarningUNRTodd, Tripp61 min
Jun 8, 9:18 PM CDTSevere Thunderstorm WarningFSDBrule, Charles Mix, Gregory57 min
Jun 8, 9:29 PM CDTSevere Thunderstorm WarningABRBuffalo, Lyman46 min
Jun 8, 9:30 PM CDTSevere Thunderstorm WarningLBFCherry, Keya Paha60 min
Jun 8, 9:56 PM CDTSevere Thunderstorm WarningLBFCherry49 min
Jun 8, 10:09 PM CDTSevere Thunderstorm WarningFSDAurora, Brule, Jerauld51 min
Jun 8, 10:13 PM CDTSevere Thunderstorm WarningABRBuffalo20 min
Jun 8, 10:28 PM CDTSevere Thunderstorm WarningLBFBrown, Cherry47 min
Jun 8, 10:35 PM CDTSevere Thunderstorm WarningFSDAurora, Brule, Charles Mix, Douglas, Gregory55 min
Jun 9, 12:10 AM CDTSevere Thunderstorm WarningFSDDouglas, Hutchinson50 min
Jun 9, 12:37 AM CDTSevere Thunderstorm WarningFSDHanson, Hutchinson38 min
Jun 9, 12:38 AM CDTSevere Thunderstorm WarningLBFGarfield, Holt, Wheeler52 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 10.9 hours before the alert went out and 288 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Aberdeen, SD at 12:00Z on 2018-06-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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.
HodographHodograph, Aberdeen, SD at 12:00Z on 2018-06-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 8 square meters per square second.193958Sfc1 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.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
778 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
8 m²/s²
0-3 km storm-relative helicity
-4 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 8, 2:01 PM CDTMesoscale DiscussionSPCArthur, Banner, Box Butte, Dawes, Garden, Grant and 4 more119 min
Jun 8, 2:39 PM CDTSevere Thunderstorm WatchSPCBox Butte, Dawes, Sioux8 hr
Jun 8, 5:02 PM CDTMesoscale DiscussionSPCCherry, Keya Paha88 min
Jun 7, 10:04 PM CDTMesoscale DiscussionSPCHarding, Perkins86 min

Nearby

Severe Thunderstorm Watches in South Dakota, 2018Severe Thunderstorm Watches in Nebraska, 2018Every severe thunderstorm watch in 2018

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.