Alert archive / Nebraska / Severe Thunderstorm Watches in 2017

Severe Thunderstorm Watch 390

July 2, 2017Phillips County, Sedgwick County, Yuma County, Colorado; 5 counties in Kansas; 25 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at Jul 2, 2017, 4:58 PM MDT for Phillips County, Sedgwick County, Yuma County, Colorado; 5 counties in Kansas; 25 counties in Nebraska. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jul 2, 2017, 4:58 PM MDT (22:58 UTC)
Expired
Jul 2, 2017, 11:00 PM MDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 33 counties

Phillips County, CO, Sedgwick County, CO, Yuma County, CO, Cheyenne County, KS, Decatur County, KS, Norton County, KS, Phillips County, KS, Rawlins County, KS, Arthur County, NE, Chase County, NE, Cherry County, NE, Custer County, NE, Dawson County, NE, Deuel County, NE, Dundy County, NE, Frontier County, NE, Furnas County, NE, Garden County, NE, Gosper County, NE, Grant County, NE, Harlan County, NE, Hayes County, NE, Hitchcock County, NE, Hooker County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Perkins County, NE, Phelps County, NE, Red Willow County, NE, Sheridan County, NE, Thomas County, NE

The radar

The North Platte radar (KLNX), 84 km from the middle of the area, began a volume at 22:59 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
10%
One or more EF2 to EF5 tornadoes
5%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
20%
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
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jul 2, 5:07 PM MDTSevere Thunderstorm WarningLBFMcPherson38 min
Jul 2, 5:16 PM MDTSevere Thunderstorm WarningLBFArthur, Grant, Hooker29 min
Jul 2, 5:21 PM MDTSevere Thunderstorm WarningLBFDeuel, Garden24 min
Jul 2, 5:26 PM MDTSevere Thunderstorm WarningLBFGarden34 min
Jul 2, 5:28 PM MDTSevere Thunderstorm WarningLBFCuster62 min
Jul 2, 5:29 PM MDTSevere Thunderstorm WarningBOULogan, Phillips, Sedgwick46 min
Jul 2, 5:37 PM MDTSevere Thunderstorm WarningLBFMcPherson23 min
Jul 2, 5:49 PM MDTTornado WarningLBFCuster26 min
Jul 2, 5:55 PM MDTSevere Thunderstorm WarningLBFLincoln50 min
Jul 2, 6:09 PM MDTSevere Thunderstorm WarningBOULogan, Phillips, Sedgwick20 min
Jul 2, 6:26 PM MDTSevere Thunderstorm WarningLBFCuster49 min
Jul 2, 6:30 PM MDTSevere Thunderstorm WarningLBFArthur, Keith, McPherson45 min
Jul 2, 6:34 PM MDTSevere Thunderstorm WarningLBFLincoln41 min
Jul 2, 6:58 PM MDTSevere Thunderstorm WarningLBFKeith, Lincoln, Perkins47 min
Jul 2, 7:02 PM MDTSevere Thunderstorm WarningLBFLincoln58 min
Jul 2, 7:06 PM MDTSevere Thunderstorm WarningLBFLincoln24 min
Jul 2, 7:07 PM MDTSevere Thunderstorm WarningGIDDawson38 min
Jul 2, 7:22 PM MDTSevere Thunderstorm WarningLBFFrontier38 min
Jul 2, 7:22 PM MDTSevere Thunderstorm WarningLBFChase, Hayes, Lincoln, Perkins38 min
Jul 2, 7:40 PM MDTSevere Thunderstorm WarningGIDDawson50 min
Jul 2, 7:45 PM MDTSevere Thunderstorm WarningLBFSheridan45 min
Jul 2, 7:58 PM MDTSevere Thunderstorm WarningLBFHayes, Lincoln47 min
Jul 2, 7:59 PM MDTSevere Thunderstorm WarningLBFFrontier46 min
Jul 2, 8:01 PM MDTSevere Thunderstorm WarningGLDDecatur, Norton59 min
Jul 2, 8:09 PM MDTSevere Thunderstorm WarningGIDFurnas, Gosper51 min
Jul 2, 8:24 PM MDTSevere Thunderstorm WarningGLDRawlins51 min
Jul 2, 8:41 PM MDTSevere Thunderstorm WarningLBFFrontier49 min
Jul 2, 8:53 PM MDTSevere Thunderstorm WarningGIDFurnas, Gosper52 min
Jul 2, 8:58 PM MDTSevere Thunderstorm WarningGLDDecatur, Graham, Norton, Rawlins, Sheridan, Thomas62 min
Jul 2, 9:14 PM MDTSevere Thunderstorm WarningGIDHarlan, Phelps46 min
Jul 2, 10:00 PM MDTSevere Thunderstorm WarningGLDDecatur, Gove, Graham, Norton, Rawlins, Sheridan and 1 more45 min
Jul 2, 10:04 PM MDTSevere Thunderstorm WarningGIDPhillips, Rooks41 min
Jul 2, 10:04 PM MDTSevere Thunderstorm WarningGLDCheyenne, Rawlins, Sherman, Thomas41 min
Jul 2, 10:35 PM MDTSevere Thunderstorm WarningGIDOsborne, Phillips, Rooks, Smith40 min
Jul 2, 10:44 PM MDTSevere Thunderstorm WarningGIDPhillips, Rooks32 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, 11.0 hours before the alert went out and 71 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 2017-07-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 535 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 2017-07-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 187 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
535 J/kg
Mixed-layer CIN
-338 J/kg
Mixed-layer LCL
1509 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
187 m²/s²
0-3 km storm-relative helicity
177 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 2, 2:16 PM MDTMesoscale DiscussionSPCAdams, Arthur, Blaine, Boone, Box Butte, Buffalo and 35 more119 min

Nearby

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