Alert archive / Nebraska / Severe Thunderstorm Watches in 2017

Severe Thunderstorm Watch 372

June 27, 201722 counties in Nebraska; 10 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jun 27, 2017, 4:07 PM MDT for 22 counties in Nebraska; 10 counties in South Dakota. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jun 27, 2017, 4:07 PM MDT (22:07 UTC)
Expired
Jun 27, 2017, 10:00 PM MDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
65 kt
All 32 counties

Arthur County, NE, Blaine County, NE, Brown County, NE, Chase County, NE, Cherry County, NE, Custer County, NE, Deuel County, NE, Frontier County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Hooker County, NE, Keith County, NE, Keya Paha County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Perkins County, NE, Rock County, NE, Sheridan County, NE, Thomas County, NE, Bennett County, SD, Custer County, SD, Fall River County, SD, Haakon County, SD, Jackson County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Todd County, SD, Tripp County, SD

The radar

The North Platte radar (KLNX), 93 km from the middle of the area, began a volume at 22:07 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
10%
One or more EF2 to EF5 tornadoes
2%
Ten or more severe wind reports
60%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 27, 4:27 PM MDTSevere Thunderstorm WarningLBFSheridan48 min
Jun 27, 4:44 PM MDTSevere Thunderstorm WarningLBFGarden30 min
Jun 27, 4:47 PM MDTSevere Thunderstorm WarningUNRCuster, Fall River, Oglala Lakota, Pennington58 min
Jun 27, 5:05 PM MDTSevere Thunderstorm WarningLBFDeuel, Garden40 min
Jun 27, 5:26 PM MDTSevere Thunderstorm WarningUNRBennett, Jackson, Oglala Lakota79 min
Jun 27, 5:34 PM MDTSevere Thunderstorm WarningUNRMeade, Pennington56 min
Jun 27, 5:41 PM MDTSevere Thunderstorm WarningUNRCuster, Jackson, Oglala Lakota, Pennington64 min
Jun 27, 5:42 PM MDTSevere Thunderstorm WarningLBFArthur, Deuel, Garden, Keith48 min
Jun 27, 6:13 PM MDTSevere Thunderstorm WarningLBFArthur, Keith, Perkins47 min
Jun 27, 6:21 PM MDTSevere Thunderstorm WarningUNRHaakon, Jackson, Meade, Mellette, Pennington54 min
Jun 27, 7:10 PM MDTSevere Thunderstorm WarningLBFLincoln35 min
Jun 27, 7:37 PM MDTSevere Thunderstorm WarningLBFCuster, Lincoln, Logan23 min
Jun 27, 8:01 PM MDTSevere Thunderstorm WarningLBFCuster44 min
Jun 27, 8:11 PM MDTSevere Thunderstorm WarningLBFBlaine, Custer, Loup34 min
Jun 27, 8:17 PM MDTSevere Thunderstorm WarningLBFGarden, Sheridan43 min
Jun 27, 8:44 PM MDTSevere Thunderstorm WarningLBFCuster31 min
Jun 27, 8:48 PM MDTSevere Thunderstorm WarningLBFGarfield, Loup42 min
Jun 27, 8:50 PM MDTSevere Thunderstorm WarningLBFFrontier29 min
Jun 27, 8:53 PM MDTSevere Thunderstorm WarningLBFArthur, Cherry, Garden, Grant, Hooker, Sheridan67 min
Jun 27, 9:38 PM MDTSevere Thunderstorm WarningLBFCherry, Hooker, Logan, McPherson, Thomas52 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

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 10.1 hours before the alert went out and 127 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, N. Platte/Lee Bi, NE at 12:00Z on 2017-06-27Temperature 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, N. Platte/Lee Bi, NE at 12:00Z on 2017-06-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 110 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
845 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
110 m²/s²
0-3 km storm-relative helicity
329 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.5

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 27, 2:48 PM MDTMesoscale DiscussionSPCCheyenne, Kit Carson, Logan, Morgan, Phillips, Washington and 1 more117 min
Jun 27, 2:04 PM MDTMesoscale DiscussionSPCBanner, Box Butte, Cheyenne, Dawes, Deuel, Garden and 5 more2 hr

Nearby

Severe Thunderstorm Watches in Nebraska, 2017Severe Thunderstorm Watches in South Dakota, 2017Every severe thunderstorm watch in 2017

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.