Alert archive / Nebraska / Severe Thunderstorm Watches in 2017

Severe Thunderstorm Watch 374

June 27, 201743 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at Jun 27, 2017, 8:56 PM CDT for 43 counties in Nebraska. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jun 27, 2017, 8:56 PM CDT (01:56 UTC)
Expired
Jun 28, 2017, 2:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
65 kt
All 43 counties

Adams County, NE, Antelope County, NE, Boone County, NE, Boyd County, NE, Buffalo County, NE, Butler County, NE, Cass County, NE, Cedar County, NE, Clay County, NE, Colfax County, NE, Dawson County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Garfield County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Holt County, NE, Howard County, NE, Kearney County, NE, Knox County, NE, Lancaster County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Otoe County, NE, Phelps County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Sherman County, NE, Stanton County, NE, Valley County, NE, Washington County, NE, Wayne County, NE, Wheeler County, NE, York County, NE

The radar

The North Platte radar (KLNX), 168 km from the middle of the area, began a volume at 01:59 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
60%
One or more gusts of 65 knots or more
50%
Ten or more severe hail reports
60%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 27, 9:40 PM CDTSevere Thunderstorm WarningGIDDawson, Gosper50 min
Jun 27, 9:48 PM CDTSevere Thunderstorm WarningLBFGarfield, Loup42 min
Jun 27, 9:54 PM CDTSevere Thunderstorm WarningGIDBuffalo, Dawson, Greeley, Howard, Sherman, Valley51 min
Jun 27, 10:06 PM CDTSevere Thunderstorm WarningGIDBuffalo, Dawson, Gosper, Kearney, Phelps39 min
Jun 27, 10:34 PM CDTSevere Thunderstorm WarningLBFHolt, Wheeler41 min
Jun 27, 10:40 PM CDTSevere Thunderstorm WarningGIDGreeley, Howard, Merrick, Nance, Sherman, Valley50 min
Jun 27, 10:42 PM CDTSevere Thunderstorm WarningGIDAdams, Buffalo, Dawson, Gosper, Hall, Kearney and 1 more48 min
Jun 27, 10:50 PM CDTSevere Thunderstorm WarningLBFHolt, Wheeler25 min
Jun 27, 11:06 PM CDTSevere Thunderstorm WarningOAXAntelope, Boone24 min
Jun 27, 11:20 PM CDTSevere Thunderstorm WarningGIDHamilton, Howard, Merrick, Nance, Polk, York40 min
Jun 27, 11:25 PM CDTSevere Thunderstorm WarningGIDAdams, Buffalo, Clay, Hall, Hamilton, Kearney38 min
Jun 28, 12:35 AM CDTSevere Thunderstorm WarningOAXButler, Lancaster, Saline, Saunders, Seward25 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 00:00Z, 1.9 hours before the alert went out and 191 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 00:00Z on 2017-06-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2312 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, N. Platte/Lee Bi, NE at 00:00Z on 2017-06-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 108 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
2312 J/kg
Mixed-layer CIN
-122 J/kg
Mixed-layer LCL
2154 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
108 m²/s²
0-3 km storm-relative helicity
303 m²/s²
Significant tornado parameter
0.0
Supercell composite
12.3

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 27, 7:35 PM CDTSevere Thunderstorm WatchSPCDakota, Dixon5 hr
Jun 27, 8:12 PM CDTMesoscale DiscussionSPCAntelope, Blaine, Boone, Boyd, Brown, Buffalo and 27 more93 min
Jun 27, 11:33 PM CDTMesoscale DiscussionSPCBurt, Cass, Dodge, Douglas, Lancaster, Otoe and 4 more57 min
Jun 28, 2:14 PM CDTMesoscale DiscussionSPCOtoe2 hr
Jun 28, 2:53 PM CDTTornado WatchSPCCass, Douglas, Nemaha, Otoe, Richardson, Sarpy9 hr
Jun 28, 4:07 PM CDTMesoscale DiscussionSPCBanner, Box Butte, Cheyenne, Dawes, Deuel, Garden and 5 more113 min
Jun 28, 5:29 PM CDTMesoscale DiscussionSPCNemaha91 min
Jun 28, 5:46 PM CDTMesoscale DiscussionSPCGage, Jefferson, Johnson, Pawnee, Richardson, Thayer89 min

Nearby

Severe Thunderstorm Watches in Nebraska, 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.