Alert archive / Nebraska / Severe Thunderstorm Watches in 2013

Severe Thunderstorm Watch 337

June 21, 20134 states

The Storm Prediction Center issued this severe thunderstorm watch at Jun 21, 2013, 1:48 PM MDT for 4 states. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: Jun 21, 2013, 1:48 PM MDT (19:48 UTC)
Expired: Jun 21, 2013, 10:00 PM MDT
In force: 8 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 28 counties

Logan County, CO, Phillips County, CO, Sedgwick County, CO, Banner County, NE, Box Butte County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Garden County, NE, Kimball County, NE, Morrill County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Butte County, SD, Custer County, SD, Fall River County, SD, Harding County, SD, Lawrence County, SD, Meade County, SD, Pennington County, SD, Perkins County, SD, Campbell County, WY, Converse County, WY, Crook County, WY, Goshen County, WY, Niobrara County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 163 km from the middle of the area, began a volume at 19:50 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: 30%
One or more gusts of 65 knots or more: 10%
Ten or more severe hail reports: 50%
One or more hailstones of 2 inches or more: 30%
Six or more combined severe hail and wind reports: 80%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 21, 2:03 PM MDT	Severe Thunderstorm Warning	UNR	Lawrence, Pennington	57 min
Jun 21, 2:16 PM MDT	Severe Thunderstorm Warning	UNR	Lawrence, Meade	59 min
Jun 21, 2:38 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne	52 min
Jun 21, 2:52 PM MDT	Severe Thunderstorm Warning	CYS	Banner	53 min
Jun 21, 2:56 PM MDT	Severe Thunderstorm Warning	UNR	Lawrence, Pennington	64 min
Jun 21, 3:02 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara, Platte	43 min
Jun 21, 3:03 PM MDT	Tornado Warning Tornado observed	CYS	Cheyenne	27 min
Jun 21, 3:15 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	45 min
Jun 21, 3:22 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Cheyenne, Morrill	38 min
Jun 21, 3:30 PM MDT	Tornado Warning Tornado observed	CYS	Cheyenne, Morrill	30 min
Jun 21, 3:34 PM MDT	Flash Flood Warning	UNR	Weston	6 hr
Jun 21, 3:46 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	44 min
Jun 21, 3:48 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne	42 min
Jun 21, 3:56 PM MDT	Tornado Warning	CYS	Cheyenne	49 min
Jun 21, 3:56 PM MDT	Tornado Warning	CYS	Banner, Kimball	34 min
Jun 21, 4:00 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Sedgwick	30 min
Jun 21, 4:01 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	44 min
Jun 21, 4:11 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Washington	34 min
Jun 21, 4:18 PM MDT	Tornado Warning	BOU	Sedgwick	27 min
Jun 21, 4:21 PM MDT	Tornado Warning	BOU	Logan, Sedgwick	24 min
Jun 21, 4:22 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Pennington	53 min
Jun 21, 4:24 PM MDT	Severe Thunderstorm Warning	LBF	Deuel	51 min
Jun 21, 4:27 PM MDT	Flash Flood Warning	CYS	Cheyenne	6 hr
Jun 21, 4:28 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Cheyenne, Kimball, Morrill	47 min
Jun 21, 4:29 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	46 min
Jun 21, 4:36 PM MDT	Tornado Warning	BOU	Sedgwick	24 min
Jun 21, 4:37 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes	38 min
Jun 21, 4:42 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Fall River	33 min
Jun 21, 4:43 PM MDT	Severe Thunderstorm Warning	LBF	Sheridan	62 min
Jun 21, 4:45 PM MDT	Severe Thunderstorm Warning	UNR	Meade, Pennington	60 min
Jun 21, 4:57 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	48 min
Jun 21, 5:02 PM MDT	Severe Thunderstorm Warning	BOU	Sedgwick	43 min
Jun 21, 5:09 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Fall River	66 min
Jun 21, 5:11 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	49 min
Jun 21, 5:14 PM MDT	Severe Thunderstorm Warning	LBF	Deuel	61 min
Jun 21, 5:19 PM MDT	Severe Thunderstorm Warning	LBF	Cherry, Sheridan	56 min
Jun 21, 5:31 PM MDT	Severe Thunderstorm Warning	BOU	Sedgwick	29 min
Jun 21, 5:39 PM MDT	Tornado Warning Tornado observed	LBF	Cherry, Sheridan	36 min
Jun 21, 5:41 PM MDT	Severe Thunderstorm Warning	CYS	Sioux	49 min
Jun 21, 5:55 PM MDT	Tornado Warning	LBF	Sheridan	35 min
Jun 21, 5:58 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Fall River	62 min
Jun 21, 6:02 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	43 min
Jun 21, 6:13 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	47 min
Jun 21, 6:27 PM MDT	Severe Thunderstorm Warning	CYS	Scotts Bluff, Sioux	48 min
Jun 21, 6:36 PM MDT	Severe Thunderstorm Warning	CYS	Dawes, Sioux	54 min
Jun 21, 6:46 PM MDT	Severe Thunderstorm Warning	CYS	Converse	44 min
Jun 21, 6:59 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	46 min
Jun 21, 7:11 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	64 min
Jun 21, 7:30 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Niobrara	45 min
Jun 21, 8:12 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Niobrara	48 min
Jun 21, 8:58 PM MDT	Severe Thunderstorm Warning	CYS	Converse	47 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

Rapid City, SD (KUNR), launched 12:00Z, 7.8 hours before the alert went out and 155 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: 1809 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 494 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 287 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 21, 1:12 PM MDT	Mesoscale Discussion	SPC	Banner, Box Butte, Dawes, Garden, Grant, Morrill and 3 more	93 min
Jun 21, 4:59 PM MDT	Mesoscale Discussion	SPC	Arthur, Blaine, Brown, Cherry, Grant, Hooker and 4 more	91 min
Jun 21, 5:31 PM MDT	Severe Thunderstorm Watch	SPC	Arthur, Brown, Cherry, Deuel, Garden, Grant and 9 more	6 hr
Jun 20, 8:37 PM MDT	Mesoscale Discussion	SPC	Beadle, Brookings, Brown, Buffalo, Campbell, Clark and 19 more	23 min
Jun 21, 6:49 AM MDT	Mesoscale Discussion	SPC	Butte, Custer, Harding, Lawrence, Meade, Pennington and 2 more	56 min
Jun 21, 8:09 AM MDT	Severe Thunderstorm Watch	SPC	Aurora, Beadle, Bennett, Brown, Brule, Buffalo and 36 more	7 hr
Jun 21, 11:01 AM MDT	Mesoscale Discussion	SPC	Aurora, Beadle, Bennett, Brule, Buffalo, Butte and 29 more	89 min
Jun 21, 12:34 PM MDT	Mesoscale Discussion	SPC	Brookings, Clark, Codington, Deuel, Grant, Hamlin and 5 more	56 min
Jun 21, 12:58 PM MDT	Tornado Watch	SPC	Aurora, Beadle, Bon Homme, Brookings, Brule, Charles Mix and 27 more	7 hr
Jun 21, 2:49 PM MDT	Mesoscale Discussion	SPC	Brookings, Deuel, Grant, Lake, Moody	86 min

Nearby

Severe Thunderstorm Watches in Nebraska, 2013 Severe Thunderstorm Watches in South Dakota, 2013 Severe Thunderstorm Watches in Wyoming, 2013 Every severe thunderstorm watch in 2013

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.