Alert archive / Nebraska / Severe Thunderstorm Watches in 2017

Severe Thunderstorm Watch 451

August 13, 20174 states

The Storm Prediction Center issued this severe thunderstorm watch at Aug 13, 2017, 3:00 PM MDT for 4 states. It was in force for 11 hr.

The area

The outline as issued.

The facts

Issued
Aug 13, 2017, 3:00 PM MDT (21:00 UTC)
Expired
Aug 14, 2017, 2:00 AM MDT
In force
11 hr
Issued by
the Storm Prediction Center
Largest hail expected
3 in
Strongest gust expected
60 kt
All 73 counties

Cheyenne County, CO, Kit Carson County, CO, Yuma County, CO, Cheyenne County, KS, Decatur County, KS, Gove County, KS, Graham County, KS, Greeley County, KS, Logan County, KS, Norton County, KS, Phillips County, KS, Rawlins County, KS, Rooks County, KS, Sheridan County, KS, Sherman County, KS, Thomas County, KS, Wallace County, KS, Wichita County, KS, Antelope County, NE, Blaine County, NE, Boone County, NE, Boyd County, NE, Brown County, NE, Buffalo County, NE, Cedar County, NE, Chase County, NE, Custer County, NE, Dawson County, NE, Dixon County, NE, Dundy County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Garfield County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Harlan County, NE, Hayes County, NE, Hitchcock County, NE, Holt County, NE, Howard County, NE, Kearney County, NE, Keith County, NE, Keya Paha County, NE, Knox County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Perkins County, NE, Phelps County, NE, Pierce County, NE, Red Willow County, NE, Rock County, NE, Sherman County, NE, Thomas County, NE, Valley County, NE, Wheeler County, NE, Bon Homme County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hutchinson County, SD, Lincoln County, SD, McCook County, SD, Minnehaha County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The North Platte radar (KLNX), 81 km from the middle of the area, began a volume at 21:01 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
10%
Ten or more severe hail reports
50%
One or more hailstones of 2 inches or more
50%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Aug 13, 3:20 PM MDTSevere Thunderstorm WarningFSDBon Homme, Charles Mix, Douglas, Hutchinson25 min
Aug 13, 3:24 PM MDTSevere Thunderstorm WarningFSDHanson, Hutchinson, McCook, Turner36 min
Aug 13, 3:33 PM MDTSevere Thunderstorm WarningLBFBlaine, Custer42 min
Aug 13, 3:39 PM MDTTornado WarningFSDBon Homme, Charles Mix36 min
Aug 13, 3:56 PM MDTSevere Thunderstorm WarningLBFCuster49 min
Aug 13, 3:58 PM MDTSevere Thunderstorm WarningLBFBlaine, Loup47 min
Aug 13, 4:02 PM MDTFlash Flood WarningLBFCuster6 hr
Aug 13, 4:15 PM MDTSevere Thunderstorm WarningFSDBon Homme, Charles Mix30 min
Aug 13, 4:40 PM MDTTornado WarningFSDBon Homme, Charles Mix35 min
Aug 13, 4:42 PM MDTSevere Thunderstorm WarningFSDMinnehaha33 min
Aug 13, 4:43 PM MDTSevere Thunderstorm WarningLBFCuster47 min
Aug 13, 4:52 PM MDTSevere Thunderstorm WarningFSDMinnehaha, Moody23 min
Aug 13, 5:23 PM MDTSevere Thunderstorm WarningLBFCuster52 min
Aug 13, 5:30 PM MDTSevere Thunderstorm WarningLBFCuster45 min
Aug 13, 5:32 PM MDTFlash Flood WarningLBFCuster8 hr
Aug 13, 5:34 PM MDTSevere Thunderstorm WarningOAXKnox41 min
Aug 13, 5:36 PM MDTSevere Thunderstorm WarningGLDGreeley39 min
Aug 13, 5:39 PM MDTSevere Thunderstorm WarningLBFCuster51 min
Aug 13, 5:39 PM MDTSevere Thunderstorm WarningFSDBon Homme21 min
Aug 13, 5:44 PM MDTSevere Thunderstorm WarningLBFBlaine, Loup46 min
Aug 13, 5:44 PM MDTSevere Thunderstorm WarningFSDMcCook, Minnehaha31 min
Aug 13, 5:58 PM MDTTornado WarningFSDMcCook17 min
Aug 13, 6:05 PM MDTTornado WarningLBFCuster40 min
Aug 13, 6:08 PM MDTSevere Thunderstorm WarningOAXKnox52 min
Aug 13, 6:14 PM MDTSevere Thunderstorm WarningFSDMcCook, Minnehaha, Turner31 min
Aug 13, 6:16 PM MDTSevere Thunderstorm WarningLBFCuster44 min
Aug 13, 6:25 PM MDTSevere Thunderstorm WarningLBFCuster50 min
Aug 13, 6:41 PM MDTSevere Thunderstorm WarningLBFCuster49 min
Aug 13, 6:43 PM MDTSevere Thunderstorm WarningGLDKit Carson, Yuma47 min
Aug 13, 6:48 PM MDTSevere Thunderstorm WarningLBFCuster42 min
Aug 13, 7:00 PM MDTSevere Thunderstorm WarningLBFCuster, Lincoln, Logan45 min
Aug 13, 7:21 PM MDTSevere Thunderstorm WarningOAXKnox, Pierce39 min
Aug 13, 7:28 PM MDTSevere Thunderstorm WarningGLDCheyenne, Kit Carson47 min
Aug 13, 7:28 PM MDTSevere Thunderstorm WarningLBFCuster47 min
Aug 13, 7:37 PM MDTSevere Thunderstorm WarningGIDBuffalo, Dawson38 min
Aug 13, 8:11 PM MDTSevere Thunderstorm WarningGIDBuffalo, Dawson49 min
Aug 13, 8:15 PM MDTSevere Thunderstorm WarningLBFCuster33 min
Aug 13, 8:34 PM MDTSevere Thunderstorm WarningGIDDawson41 min
Aug 13, 8:59 PM MDTSevere Thunderstorm WarningGIDBuffalo, Dawson46 min
Aug 13, 9:01 PM MDTSevere Thunderstorm WarningGIDDawson44 min
Aug 13, 9:24 PM MDTSevere Thunderstorm WarningGIDDawson, Gosper51 min
Aug 13, 9:48 PM MDTSevere Thunderstorm WarningLBFFrontier27 min
Aug 13, 9:59 PM MDTSevere Thunderstorm WarningGIDGosper46 min
Aug 13, 10:32 PM MDTSevere Thunderstorm WarningGIDFurnas, Gosper, Harlan, Phelps43 min
Aug 13, 10:40 PM MDTSevere Thunderstorm WarningLBFFrontier50 min
Aug 13, 11:09 PM MDTSevere Thunderstorm WarningGIDFurnas, Gosper, Harlan51 min
Aug 13, 11:30 PM MDTSevere Thunderstorm WarningLBFFrontier45 min
Aug 13, 11:41 PM MDTSevere Thunderstorm WarningGLDRed Willow34 min
Aug 13, 11:49 PM MDTSevere Thunderstorm WarningGIDFurnas, Gosper41 min
Aug 14, 12:22 AM MDTSevere Thunderstorm WarningGIDFurnas38 min
Aug 14, 12:29 AM MDTFlash Flood WarningGIDFurnas, Gosper6 hr
Aug 14, 12:37 AM MDTSevere Thunderstorm WarningGIDDawson38 min
Aug 14, 12:44 AM MDTFlash Flood WarningLBFFrontier6 hr
Aug 14, 12:52 AM MDTFlash Flood WarningLBFCuster5 hr
Aug 14, 1:13 AM MDTSevere Thunderstorm WarningGIDDawson47 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, 9.0 hours before the alert went out and 91 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 2017-08-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 439 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 12:00Z on 2017-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 83 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
439 J/kg
Mixed-layer CIN
-191 J/kg
Mixed-layer LCL
890 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
83 m²/s²
0-3 km storm-relative helicity
96 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 13, 1:50 PM MDTMesoscale DiscussionSPCBaca85 min
Aug 13, 2:41 PM MDTSevere Thunderstorm WatchSPCBaca, Bent, Crowley, Kiowa, Las Animas, Otero and 1 more8 hr
Aug 12, 7:41 PM MDTMesoscale DiscussionSPCBuffalo, Custer, Dawson, Frontier, Furnas, Gosper and 4 more94 min
Aug 13, 2:18 PM MDTMesoscale DiscussionSPCBlaine, Boyd, Brown, Buffalo, Custer, Dawson and 22 more117 min

Nearby

Severe Thunderstorm Watches in Nebraska, 2017Severe Thunderstorm Watches in Kansas, 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.