Alert archive / Nebraska / Severe Thunderstorm Watches in 2012

Severe Thunderstorm Watch 414

June 19, 20124 states

The Storm Prediction Center issued this severe thunderstorm watch at Jun 19, 2012, 7:01 PM CDT for 4 states. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jun 19, 2012, 7:01 PM CDT (00:01 UTC)
Expired
Jun 20, 2012, 2:00 AM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 52 counties

Lyon County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Cottonwood County, MN, Jackson County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Antelope County, NE, Blaine County, NE, Boyd County, NE, Brown County, NE, Cedar County, NE, Custer County, NE, Dawson County, NE, Dixon County, NE, Garfield County, NE, Holt County, NE, Keya Paha County, NE, Knox County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Pierce County, NE, Rock County, NE, Thomas County, NE, Valley County, NE, Wayne County, NE, Wheeler County, NE, Bon Homme County, SD, Brookings County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hutchinson County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 157 km from the middle of the area, began a volume at 00:02 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
60%
One or more gusts of 65 knots or more
50%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
40%
Six or more combined severe hail and wind reports
60%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 19, 10:53 PM CDTSevere Thunderstorm WarningLBFLogan, McPherson, Thomas57 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 00:00Z, 0.0 hours before the alert went out and 200 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 00:00Z on 2012-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 322 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 2012-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 105 square meters per square second.19395878Sfc1 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
322 J/kg
Mixed-layer CIN
-368 J/kg
Mixed-layer LCL
663 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
105 m²/s²
0-3 km storm-relative helicity
206 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.2

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 20, 2:10 PM CDTMesoscale DiscussionSPCBuena Vista, Butler, Cerro Gordo, Chickasaw, Clay, Dickinson and 15 more95 min
Jun 20, 3:24 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Boone, Carroll, Cass and 19 more96 min
Jun 19, 9:12 PM CDTMesoscale DiscussionSPCAnoka, Benton, Big Stone, Chippewa, Chisago, Douglas and 22 more93 min
Jun 19, 9:17 PM CDTMesoscale DiscussionSPCAitkin, Becker, Cass, Clay, Crow Wing, Hubbard and 7 more88 min
Jun 19, 11:20 PM CDTSevere Thunderstorm WatchSPCBig Stone, Traverse5 hr
Jun 19, 11:37 PM CDTMesoscale DiscussionSPCAitkin, Benton, Big Stone, Carlton, Cass, Chippewa and 22 more83 min
Jun 20, 4:00 AM CDTMesoscale DiscussionSPCLac qui Parle60 min
Jun 20, 5:27 AM CDTMesoscale DiscussionSPCAitkin, Carlton, Crow Wing, Mille Lacs, Morrison2 hr
Jun 20, 9:40 AM CDTMesoscale DiscussionSPCAnoka, Benton, Chisago, Isanti, Kanabec, Mille Lacs and 3 more95 min
Jun 19, 8:50 PM CDTMesoscale DiscussionSPCArthur, Box Butte, Cherry, Dawes, Garden, Grant and 7 more85 min
Jun 19, 11:59 PM CDTMesoscale DiscussionSPCBox Butte, Dawes, Garden, Grant, Morrill, Sheridan91 min
Jun 20, 12:57 AM CDTSevere Thunderstorm WatchSPCBlaine, Boyd, Brown, Cherry, Garden, Grant and 7 more3 hr

Nearby

Severe Thunderstorm Watches in Nebraska, 2012Severe Thunderstorm Watches in South Dakota, 2012Severe Thunderstorm Watches in Minnesota, 2012Every severe thunderstorm watch in 2012

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.