Alert archive / Nebraska / Severe Thunderstorm Watches in 2018

Severe Thunderstorm Watch 81

May 10, 201846 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at May 10, 2018, 7:59 PM CDT for 46 counties in Nebraska. It was in force for 9 hr.

The area

The outline as issued.

The facts

Issued
May 10, 2018, 7:59 PM CDT (00:59 UTC)
Expired
May 11, 2018, 5:00 AM CDT
In force
9 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 46 counties

Adams County, NE, Arthur County, NE, Blaine County, NE, Brown County, NE, Buffalo County, NE, Chase County, NE, Cherry County, NE, Clay County, NE, Custer County, NE, Dawson County, NE, Dundy County, NE, Fillmore County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Garfield County, NE, Gosper County, NE, Grant County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Hayes County, NE, Hitchcock County, NE, Holt County, NE, Hooker County, NE, Howard County, NE, Kearney County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Merrick County, NE, Nance County, NE, Perkins County, NE, Phelps County, NE, Polk County, NE, Red Willow County, NE, Rock County, NE, Sherman County, NE, Thomas County, NE, Valley County, NE, Webster County, NE, Wheeler County, NE, York County, NE

The radar

The North Platte radar (KLNX), 55 km from the middle of the area, began a volume at 00:59 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
2%
Ten or more severe wind reports
50%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
50%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
90%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 10, 8:05 PM CDTSevere Thunderstorm WarningLBFChase, Perkins40 min
May 10, 8:16 PM CDTSevere Thunderstorm WarningLBFHooker, Logan, McPherson, Thomas44 min
May 10, 8:29 PM CDTSevere Thunderstorm WarningLBFKeith, Lincoln, Perkins46 min
May 10, 8:42 PM CDTSevere Thunderstorm WarningLBFPerkins48 min
May 10, 8:47 PM CDTSevere Thunderstorm WarningLBFCherry, Logan, McPherson, Thomas43 min
May 10, 9:28 PM CDTSevere Thunderstorm WarningLBFLincoln, Perkins47 min
May 10, 9:41 PM CDTSevere Thunderstorm WarningLBFLincoln49 min
May 10, 10:05 PM CDTSevere Thunderstorm WarningLBFBlaine, Custer, Lincoln55 min
May 10, 10:09 PM CDTSevere Thunderstorm WarningLBFLincoln51 min
May 10, 10:13 PM CDTSevere Thunderstorm WarningLBFLincoln, Perkins62 min
May 10, 10:17 PM CDTSevere Thunderstorm WarningGIDDawson58 min
May 10, 10:57 PM CDTSevere Thunderstorm WarningGIDBuffalo, Sherman, Valley63 min
May 10, 10:58 PM CDTSevere Thunderstorm WarningLBFCuster62 min
May 10, 11:01 PM CDTSevere Thunderstorm WarningLBFLincoln29 min
May 10, 11:13 PM CDTSevere Thunderstorm WarningGIDDawson47 min
May 10, 11:25 PM CDTSevere Thunderstorm WarningLBFFrontier, Lincoln50 min
May 10, 11:30 PM CDTSevere Thunderstorm WarningLBFKeith, Perkins45 min
May 10, 11:44 PM CDTSevere Thunderstorm WarningGIDBuffalo, Dawson, Gosper, Kearney, Phelps, Sherman61 min
May 10, 11:59 PM CDTSevere Thunderstorm WarningLBFCuster31 min
May 11, 12:06 AM CDTSevere Thunderstorm WarningGIDAdams, Buffalo, Franklin, Gosper, Greeley, Hall and 6 more39 min
May 11, 12:12 AM CDTSevere Thunderstorm WarningLBFKeith, Lincoln48 min
May 11, 12:35 AM CDTSevere Thunderstorm WarningGIDAdams, Clay, Franklin, Hall, Hamilton, Howard and 4 more40 min
May 11, 12:41 AM CDTSevere Thunderstorm WarningLBFFrontier, Lincoln49 min
May 11, 12:44 AM CDTSevere Thunderstorm WarningGIDBuffalo, Dawson, Hall, Kearney, Phelps46 min
May 11, 12:53 AM CDTSevere Thunderstorm WarningLBFKeith, Lincoln52 min
May 11, 1:13 AM CDTSevere Thunderstorm WarningGIDClay, Fillmore, Hamilton, Nuckolls, Thayer, Webster and 1 more62 min
May 11, 1:43 AM CDTSevere Thunderstorm WarningGIDAdams, Buffalo, Hall, Kearney47 min
May 11, 1:44 AM CDTSevere Thunderstorm WarningLBFKeith, Lincoln46 min
May 11, 2:17 AM CDTSevere Thunderstorm WarningGIDBuffalo, Dawson, Phelps43 min
May 11, 2:26 AM CDTSevere Thunderstorm WarningGIDAdams, Clay, Hamilton31 min
May 11, 2:27 AM CDTSevere Thunderstorm WarningLBFLincoln, Logan, McPherson48 min
May 11, 2:28 AM CDTSevere Thunderstorm WarningGIDAdams, Buffalo, Hall, Kearney30 min
May 11, 3:12 AM CDTSevere Thunderstorm WarningLBFLincoln, Logan63 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, 1.0 hours before the alert went out and 80 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 2018-05-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1050 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 2018-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 144 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
1050 J/kg
Mixed-layer CIN
-108 J/kg
Mixed-layer LCL
1982 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
144 m²/s²
0-3 km storm-relative helicity
446 m²/s²
Significant tornado parameter
0.0
Supercell composite
8.2

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 10, 7:06 PM CDTMesoscale DiscussionSPCDundy114 min
May 10, 7:39 PM CDTMesoscale DiscussionSPCAdams, Arthur, Blaine, Buffalo, Chase, Custer and 25 more2 hr
May 10, 11:16 PM CDTMesoscale DiscussionSPCAdams, Antelope, Boone, Buffalo, Chase, Custer and 19 more89 min
May 11, 1:13 AM CDTMesoscale DiscussionSPCButler, Cass, Douglas, Gage, Jefferson, Johnson and 7 more92 min
May 11, 1:50 AM CDTSevere Thunderstorm WatchSPCButler, Cass, Gage, Jefferson, Johnson, Lancaster and 6 more3 hr
May 11, 4:24 AM CDTMesoscale DiscussionSPCAdams, Butler, Cass, Clay, Colfax, Douglas and 22 more66 min
May 11, 3:02 PM CDTSevere Thunderstorm WatchSPCBanner, Kimball, Scotts Bluff, Sioux7 hr
May 11, 6:39 PM CDTMesoscale DiscussionSPCBanner, Kimball, Scotts Bluff, Sioux96 min

Nearby

Severe Thunderstorm Watches in Nebraska, 2018Every severe thunderstorm watch in 2018

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.