Alert archive / South Dakota / Severe Thunderstorm Watches in 2018

Severe Thunderstorm Watch 145

June 1, 201828 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jun 1, 2018, 2:53 PM CDT for 28 counties in South Dakota. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jun 1, 2018, 2:53 PM CDT (19:53 UTC)
Expired
Jun 1, 2018, 10:00 PM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
60 kt
All 28 counties

Aurora County, SD, Bon Homme County, SD, Brule County, SD, Buffalo County, SD, Campbell County, SD, Charles Mix County, SD, Corson County, SD, Dewey County, SD, Douglas County, SD, Edmunds County, SD, Faulk County, SD, Gregory County, SD, Haakon County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jerauld County, SD, Jones County, SD, Lyman County, SD, McPherson County, SD, Mellette County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD, Walworth County, SD, Ziebach County, SD

The radar

The Aberdeen radar (KABR), 134 km from the middle of the area, began a volume at 19:55 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
10%
Ten or more severe wind reports
50%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
70%
One or more hailstones of 2 inches or more
70%
Six or more combined severe hail and wind reports
90%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 1, 3:37 PM CDTSevere Thunderstorm WarningUNRMellette, Todd19 min
Jun 1, 3:58 PM CDTSevere Thunderstorm WarningUNRTodd47 min
Jun 1, 4:15 PM CDTSevere Thunderstorm WarningUNRTripp30 min
Jun 1, 4:44 PM CDTSevere Thunderstorm WarningUNRMellette, Todd, Tripp61 min
Jun 1, 4:55 PM CDTSevere Thunderstorm WarningABRCorson50 min
Jun 1, 5:04 PM CDTSevere Thunderstorm WarningABRCorson, Dewey41 min
Jun 1, 5:42 PM CDTSevere Thunderstorm WarningABRCorson33 min
Jun 1, 5:44 PM CDTSevere Thunderstorm WarningABRCorson, Dewey46 min
Jun 1, 6:26 PM CDTSevere Thunderstorm WarningFSDBrule, Charles Mix, Gregory49 min
Jun 1, 6:28 PM CDTSevere Thunderstorm WarningABRCorson47 min
Jun 1, 6:47 PM CDTSevere Thunderstorm WarningFSDAurora, Brule, Charles Mix, Douglas, Gregory43 min
Jun 1, 7:00 PM CDTSevere Thunderstorm WarningABRCampbell, Corson, Dewey, Walworth60 min
Jun 1, 7:23 PM CDTSevere Thunderstorm WarningABRDewey, Potter, Sully, Walworth67 min
Jun 1, 7:24 PM CDTSevere Thunderstorm WarningFSDAurora, Charles Mix, Davison, Douglas, Hutchinson, Jerauld and 1 more36 min
Jun 1, 7:44 PM CDTSevere Thunderstorm WarningABRCampbell, Edmunds, McPherson, Walworth61 min
Jun 1, 8:00 PM CDTSevere Thunderstorm WarningFSDBon Homme, Charles Mix, Douglas, Gregory, Hutchinson45 min
Jun 1, 8:14 PM CDTSevere Thunderstorm WarningABREdmunds, Faulk, Hughes, Hyde, Lyman, Potter and 3 more46 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, 7.9 hours before the alert went out and 110 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 2018-06-01Temperature 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 2018-06-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 192 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
1621 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
192 m²/s²
0-3 km storm-relative helicity
255 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 1, 12:45 PM CDTSevere Thunderstorm WatchSPCButte, Harding, Lawrence, Meade, Perkins6 hr
Jun 1, 2:13 PM CDTMesoscale DiscussionSPCCampbell, Corson, Dewey, Haakon, Jones, Mellette and 5 more2 hr
Jun 1, 4:04 PM CDTMesoscale DiscussionSPCButte, Custer, Harding, Lawrence86 min
Jun 1, 6:32 PM CDTMesoscale DiscussionSPCAurora, Beadle, Bon Homme, Brule, Buffalo, Campbell and 22 more88 min

Nearby

Severe Thunderstorm Watches in South Dakota, 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.