Alert archive / South Dakota / Severe Thunderstorm Watches in 2011

Severe Thunderstorm Watch 557

June 26, 201114 counties in Nebraska; 24 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jun 26, 2011, 1:03 PM CDT for 14 counties in Nebraska; 24 counties in South Dakota. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Jun 26, 2011, 1:03 PM CDT (18:03 UTC)
Expired: Jun 26, 2011, 8:00 PM CDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2.5 in
Strongest gust expected: 60 kt

All 38 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, Bennett County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Custer County, SD, Douglas County, SD, Gregory County, SD, Haakon County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jackson County, SD, Jerauld County, SD, Jones County, SD, Lyman County, SD, Meade County, SD, Mellette County, SD, Pennington County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD, Ziebach County, SD

The radar

The North Platte radar (KLNX), 124 km from the middle of the area, began a volume at 18:07 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: 5%
Ten or more severe wind reports: 30%
One or more gusts of 65 knots or more: 30%
Ten or more severe hail reports: 30%
One or more hailstones of 2 inches or more: 40%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 26, 1:19 PM CDT	Severe Thunderstorm Warning	UNR	Haakon, Jackson, Meade, Pennington	56 min
Jun 26, 1:29 PM CDT	Severe Thunderstorm Warning	LBF	Cherry	46 min
Jun 26, 1:37 PM CDT	Tornado Warning	LBF	Cherry	38 min
Jun 26, 1:55 PM CDT	Severe Thunderstorm Warning	UNR	Custer, Pennington	65 min
Jun 26, 2:02 PM CDT	Tornado Warning	LBF	Cherry	43 min
Jun 26, 2:14 PM CDT	Severe Thunderstorm Warning	LBF	Cherry	46 min
Jun 26, 2:54 PM CDT	Severe Thunderstorm Warning	UNR	Custer, Pennington	32 min
Jun 26, 2:58 PM CDT	Severe Thunderstorm Warning	LBF	Brown, Cherry	47 min
Jun 26, 3:15 PM CDT	Severe Thunderstorm Warning	UNR	Pennington	41 min
Jun 26, 3:18 PM CDT	Severe Thunderstorm Warning	LBF	Brown, Rock	42 min
Jun 26, 3:37 PM CDT	Severe Thunderstorm Warning	UNR	Meade, Pennington	53 min
Jun 26, 4:18 PM CDT	Severe Thunderstorm Warning	UNR	Meade, Pennington	57 min
Jun 26, 4:22 PM CDT	Severe Thunderstorm Warning	UNR	Haakon, Jackson, Pennington	53 min
Jun 26, 4:25 PM CDT	Severe Thunderstorm Warning	LBF	Garfield, Holt, Wheeler	50 min
Jun 26, 4:32 PM CDT	Tornado Warning	LBF	Garfield, Wheeler	28 min
Jun 26, 4:36 PM CDT	Severe Thunderstorm Warning	LBF	Boyd, Holt	39 min
Jun 26, 4:51 PM CDT	Severe Thunderstorm Warning	UNR	Haakon, Pennington, Ziebach	41 min
Jun 26, 4:58 PM CDT	Tornado Warning	LBF	Garfield, Wheeler	32 min
Jun 26, 5:07 PM CDT	Severe Thunderstorm Warning	LBF	Boyd, Holt	38 min
Jun 26, 5:12 PM CDT	Severe Thunderstorm Warning	UNR	Haakon, Jackson, Pennington	63 min
Jun 26, 5:13 PM CDT	Tornado Warning	LBF	Garfield, Holt, Wheeler	32 min
Jun 26, 5:32 PM CDT	Severe Thunderstorm Warning	UNR	Fall River	58 min
Jun 26, 5:45 PM CDT	Severe Thunderstorm Warning	LBF	Wheeler	15 min
Jun 26, 5:59 PM CDT	Severe Thunderstorm Warning	LBF	Sheridan	61 min
Jun 26, 6:38 PM CDT	Severe Thunderstorm Warning	LBF	Sheridan	52 min
Jun 26, 6:46 PM CDT	Severe Thunderstorm Warning	UNR	Custer, Fall River	59 min
Jun 26, 7:13 PM CDT	Severe Thunderstorm Warning	LBF	Cherry	47 min
Jun 26, 7:26 PM CDT	Severe Thunderstorm Warning	LBF	Sheridan	34 min
Jun 26, 7:53 PM CDT	Severe Thunderstorm Warning	LBF	Sheridan	37 min
Jun 26, 8:00 PM CDT	Severe Thunderstorm Warning	LBF	Cherry, Grant, Hooker	45 min

Discussions around it

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

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 25, 8:14 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Cherry, Keya Paha, Rock, Sheridan	6 hr
Jun 25, 11:27 PM CDT	Mesoscale Discussion	SPC	Brown, Cherry, Keya Paha	63 min
Jun 26, 6:08 AM CDT	Mesoscale Discussion	SPC	Cherry, Keya Paha	97 min
Jun 26, 6:16 AM CDT	Mesoscale Discussion	SPC	Antelope, Boone, Boyd, Brown, Burt, Butler and 40 more	59 min
Jun 26, 10:44 AM CDT	Mesoscale Discussion	SPC	Brown, Cherry, Grant, Hooker, Keya Paha, Sheridan and 1 more	2 hr
Jun 26, 2:30 PM CDT	Mesoscale Discussion	SPC	Antelope, Banner, Blaine, Boone, Box Butte, Boyd and 22 more	2 hr
Jun 26, 3:09 PM CDT	Mesoscale Discussion	SPC	Adams, Boone, Butler, Cass, Clay, Colfax and 20 more	2 hr
Jun 26, 4:56 PM CDT	Severe Thunderstorm Watch	SPC	Antelope, Boone, Burt, Butler, Cass, Cedar and 26 more	7 hr
Jun 26, 12:35 PM CDT	Mesoscale Discussion	SPC	Brown, Campbell, Corson, Dewey, Edmunds, Faulk and 10 more	85 min

Nearby

Severe Thunderstorm Watches in South Dakota, 2011 Severe Thunderstorm Watches in Nebraska, 2011 Every severe thunderstorm watch in 2011

Sources

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