Alert archive / South Dakota / Severe Thunderstorm Watches in 2014

Severe Thunderstorm Watch 341

June 21, 201420 counties in Nebraska; 34 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jun 21, 2014, 1:56 PM MDT for 20 counties in Nebraska; 34 counties in South Dakota. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Jun 21, 2014, 1:56 PM MDT (19:56 UTC)
Expired: Jun 21, 2014, 9:00 PM MDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2.5 in
Strongest gust expected: 60 kt

All 54 counties

Arthur County, NE, Banner County, NE, Box Butte County, NE, Brown County, NE, Cherry County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Garden County, NE, Grant County, NE, Hooker County, NE, Keith County, NE, Keya Paha County, NE, Kimball County, NE, McPherson County, NE, Morrill County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Thomas County, NE, Bennett County, SD, Brown County, SD, Buffalo County, SD, Campbell County, SD, Clark County, SD, Codington County, SD, Corson County, SD, Custer County, SD, Day County, SD, Dewey County, SD, Edmunds County, SD, Fall River County, SD, Faulk County, SD, Haakon County, SD, Hamlin County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jackson County, SD, Jones County, SD, Lyman County, SD, Marshall County, SD, McPherson County, SD, Meade County, SD, Mellette County, SD, Pennington County, SD, Potter County, SD, Spink County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD, Walworth County, SD, Ziebach County, SD

The radar

The Rapid City radar (KUDX), 141 km from the middle of the area, began a volume at 19:58 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: 10%
One or more EF2 to EF5 tornadoes: 2%
Ten or more severe wind reports: 70%
One or more gusts of 65 knots or more: 10%
Ten or more severe hail reports: 70%
One or more hailstones of 2 inches or more: 50%
Six or more combined severe hail and wind reports: 90%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 21, 2:24 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	36 min
Jun 21, 2:27 PM MDT	Severe Thunderstorm Warning	ABR	Campbell, Edmunds, McPherson, Walworth	48 min
Jun 21, 2:43 PM MDT	Severe Thunderstorm Warning	UNR		62 min
Jun 21, 3:12 PM MDT	Severe Thunderstorm Warning	ABR	Campbell, Edmunds, McPherson, Walworth	63 min
Jun 21, 3:21 PM MDT	Severe Thunderstorm Warning	ABR	McPherson	39 min
Jun 21, 3:51 PM MDT	Severe Thunderstorm Warning	ABR	Edmunds, Faulk, McPherson, Walworth	54 min
Jun 21, 3:57 PM MDT	Severe Thunderstorm Warning	UNR	Bennett, Jackson, Mellette, Todd	63 min
Jun 21, 4:20 PM MDT	Severe Thunderstorm Warning	UNR	Haakon, Jackson	40 min
Jun 21, 4:43 PM MDT	Severe Thunderstorm Warning	ABR	Edmunds	47 min
Jun 21, 4:44 PM MDT	Severe Thunderstorm Warning	ABR	Stanley	46 min
Jun 21, 4:52 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Cheyenne, Kimball	45 min
Jun 21, 4:56 PM MDT	Severe Thunderstorm Warning	UNR	Haakon	41 min
Jun 21, 5:03 PM MDT	Severe Thunderstorm Warning	UNR	Pennington	47 min
Jun 21, 5:17 PM MDT	Severe Thunderstorm Warning	ABR	Brown, Edmunds, Faulk, Spink	43 min
Jun 21, 5:18 PM MDT	Severe Thunderstorm Warning	ABR	Dewey, Potter, Stanley, Sully	57 min
Jun 21, 5:23 PM MDT	Severe Thunderstorm Warning	UNR	Lawrence, Pennington	67 min
Jun 21, 5:29 PM MDT	Severe Thunderstorm Warning	ABR	McPherson	46 min
Jun 21, 5:45 PM MDT	Severe Thunderstorm Warning	ABR	Brown, Edmunds, Faulk, Spink	45 min
Jun 21, 5:47 PM MDT	Severe Thunderstorm Warning	ABR	Dewey, Potter, Sully, Walworth	58 min
Jun 21, 5:50 PM MDT	Severe Thunderstorm Warning	ABR	Dewey	22 min
Jun 21, 5:56 PM MDT	Severe Thunderstorm Warning	ABR	Edmunds, Faulk, Spink	49 min
Jun 21, 6:07 PM MDT	Severe Thunderstorm Warning	ABR	Edmunds, McPherson	53 min
Jun 21, 6:17 PM MDT	Severe Thunderstorm Warning	ABR	Corson, Dewey	58 min
Jun 21, 6:20 PM MDT	Severe Thunderstorm Warning	UNR	Lawrence, Pennington	55 min
Jun 21, 6:31 PM MDT	Severe Thunderstorm Warning	ABR	Dewey, Potter, Walworth	44 min
Jun 21, 6:34 PM MDT	Tornado Warning Tornado observed	ABR	Dewey	18 min
Jun 21, 6:36 PM MDT	Severe Thunderstorm Warning	UNR	Haakon, Meade, Pennington, Ziebach	54 min
Jun 21, 6:38 PM MDT	Severe Thunderstorm Warning	ABR	Edmunds, Faulk, Potter, Walworth	52 min
Jun 21, 6:42 PM MDT	Severe Thunderstorm Warning	ABR	Faulk, Hand, Spink	48 min
Jun 21, 6:43 PM MDT	Severe Thunderstorm Warning	ABR	Campbell, Corson, Dewey, Walworth	62 min
Jun 21, 6:46 PM MDT	Severe Thunderstorm Warning	ABR	Edmunds, Faulk, Hand, Hyde, Potter, Sully and 1 more	44 min
Jun 21, 6:59 PM MDT	Severe Thunderstorm Warning	ABR	Corson, Dewey, Potter, Walworth	45 min
Jun 21, 7:10 PM MDT	Severe Thunderstorm Warning	ABR	Buffalo, Hand, Hughes, Hyde, Lyman, Stanley and 1 more	25 min
Jun 21, 7:14 PM MDT	Tornado Warning	ABR	Faulk, Hand	31 min
Jun 21, 7:14 PM MDT	Severe Thunderstorm Warning	UNR	Tripp	38 min
Jun 21, 7:16 PM MDT	Severe Thunderstorm Warning	UNR	Lawrence, Meade	59 min
Jun 21, 7:25 PM MDT	Flash Flood Warning	ABR	Faulk	12 hr
Jun 21, 7:26 PM MDT	Severe Thunderstorm Warning	UNR	Meade, Ziebach	38 min
Jun 21, 7:29 PM MDT	Severe Thunderstorm Warning	ABR	Faulk, Hand, Spink	61 min
Jun 21, 7:40 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Pennington	32 min
Jun 21, 8:15 PM MDT	Severe Thunderstorm Warning	ABR	Clark, Codington, Hamlin, Spink	60 min
Jun 21, 8:28 PM MDT	Flash Flood Warning	ABR	Edmunds, McPherson	12 hr

Discussions around it

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

The nearest sounding before it

Rapid City, SD (KRAP), launched 12:00Z, 7.9 hours before the alert went out and 137 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 219 J/kg
Mixed-layer CIN: -328 J/kg
Mixed-layer LCL: 2000 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 79 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 20, 6:05 PM MDT	Mesoscale Discussion	SPC	Adams, Arthur, Blaine, Brown, Buffalo, Chase and 36 more	85 min
Jun 20, 7:29 PM MDT	Mesoscale Discussion	SPC	Adams, Antelope, Boone, Buffalo, Burt, Butler and 55 more	91 min
Jun 20, 7:51 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Antelope, Boone, Buffalo, Butler, Cass and 41 more	6 hr
Jun 20, 10:28 PM MDT	Mesoscale Discussion	SPC	Adams, Burt, Butler, Cass, Clay, Colfax and 29 more	92 min
Jun 21, 12:57 AM MDT	Mesoscale Discussion	SPC	Adams, Buffalo, Cass, Clay, Dawson, Fillmore and 20 more	63 min
Jun 21, 1:23 PM MDT	Mesoscale Discussion	SPC	Box Butte, Dawes, Garden, Morrill, Scotts Bluff, Sheridan and 1 more	67 min
Jun 21, 2:43 PM MDT	Mesoscale Discussion	SPC	Dundy	2 hr
Jun 21, 4:49 PM MDT	Mesoscale Discussion	SPC	Cherry, Grant, Hooker	86 min

Nearby

Severe Thunderstorm Watches in South Dakota, 2014 Severe Thunderstorm Watches in Nebraska, 2014 Every severe thunderstorm watch in 2014

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.