Alert archive / Nebraska / Tornado Watches in 2012

Tornado Watch 167

April 14, 201213 counties in Nebraska

The Storm Prediction Center issued this tornado watch at Apr 14, 2012, 2:33 PM CDT for 13 counties in Nebraska. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
Apr 14, 2012, 2:33 PM CDT (19:33 UTC)
Expired
Apr 14, 2012, 11:00 PM CDT
In force
8 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
60 kt

Counties Blaine County, NE, Custer County, NE, Frontier County, NE, Garfield County, NE, Hayes County, NE, Holt County, NE, Hooker County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Thomas County, NE, Wheeler County, NE

The radar

The North Platte radar (KLNX), 69 km from the middle of the area, began a volume at 19:32 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
60%
One or more EF2 to EF5 tornadoes
50%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
70%
One or more hailstones of 2 inches or more
60%
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
Apr 14, 3:46 PM CDTSevere Thunderstorm WarningLBFFrontier, Lincoln44 min
Apr 14, 4:01 PM CDTSevere Thunderstorm WarningLBFLincoln, Logan, McPherson44 min
Apr 14, 4:13 PM CDTSevere Thunderstorm WarningLBFLogan, Thomas47 min
Apr 14, 4:20 PM CDTSevere Thunderstorm WarningLBFLincoln, Logan, McPherson25 min
Apr 14, 4:22 PM CDTSevere Thunderstorm WarningLBFLincoln, Logan38 min
Apr 14, 4:28 PM CDTTornado WarningLBFLogan, McPherson32 min
Apr 14, 4:45 PM CDTSevere Thunderstorm WarningLBFLincoln, Logan, McPherson30 min
Apr 14, 5:00 PM CDTSevere Thunderstorm WarningLBFLogan45 min
Apr 14, 5:08 PM CDTSevere Thunderstorm WarningLBFLincoln22 min
Apr 14, 5:19 PM CDTFlash Flood WarningLBFLogan4 hr
Apr 14, 5:19 PM CDTTornado WarningLBFLincoln26 min
Apr 14, 5:44 PM CDTTornado WarningLBFLincoln16 min
Apr 14, 6:01 PM CDTTornado WarningLBFLincoln29 min
Apr 14, 6:09 PM CDTSevere Thunderstorm WarningLBFCuster51 min
Apr 14, 6:09 PM CDTSevere Thunderstorm WarningLBFLincoln51 min
Apr 14, 6:19 PM CDTTornado WarningLBFLincoln41 min
Apr 14, 6:33 PM CDTSevere Thunderstorm WarningLBFLincoln, Logan27 min
Apr 14, 6:34 PM CDTTornado WarningLBFBlaine, Custer, Loup26 min
Apr 14, 6:41 PM CDTTornado WarningLBFLincoln33 min
Apr 14, 6:54 PM CDTFlash Flood WarningLBFLincoln, Logan4 hr
Apr 14, 6:55 PM CDTSevere Thunderstorm WarningLBFLincoln, Logan65 min
Apr 14, 7:01 PM CDTTornado WarningLBFBlaine, Loup16 min
Apr 14, 7:05 PM CDTSevere Thunderstorm WarningLBFBlaine, Custer40 min
Apr 14, 7:18 PM CDTSevere Thunderstorm WarningLBFLincoln42 min
Apr 14, 7:35 PM CDTSevere Thunderstorm WarningLBFCuster, Lincoln, Logan40 min
Apr 14, 7:41 PM CDTTornado WarningLBFBlaine, Custer, Loup34 min
Apr 14, 8:07 PM CDTTornado WarningLBFGarfield, Holt, Loup, Rock25 min
Apr 14, 8:13 PM CDTSevere Thunderstorm WarningLBFCuster47 min
Apr 14, 8:15 PM CDTSevere Thunderstorm WarningLBFCuster33 min
Apr 14, 8:29 PM CDTSevere Thunderstorm WarningLBFGarfield, Holt, Loup, Rock, Wheeler46 min
Apr 14, 8:39 PM CDTSevere Thunderstorm WarningLBFCuster, Garfield, Loup51 min
Apr 14, 8:47 PM CDTSevere Thunderstorm WarningLBFKeith, Lincoln, McPherson43 min
Apr 14, 9:32 PM CDTSevere Thunderstorm WarningLBFCuster43 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, 7.6 hours before the alert went out and 24 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 2012-04-14Temperature 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 2012-04-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 192 square meters per square second.1939587897117Sfc1 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
1610 m above ground
0-6 km bulk shear
69 kt
0-1 km storm-relative helicity
192 m²/s²
0-3 km storm-relative helicity
202 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

926 
WWUS20 KWNS 141929
SEL7
SPC WW 141929
NEZ000-150200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 167
NWS STORM PREDICTION CENTER NORMAN OK
130 PM MDT SAT APR 14 2012

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

       CENTRAL NEBRASKA

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 130 PM UNTIL
800 PM MDT.

TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 35 MILES WEST OF NORTH
PLATTE NEBRASKA TO 25 MILES SOUTHEAST OF BROKEN BOW NEBRASKA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU7).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

OTHER WATCH INFORMATION...CONTINUE...WW 165...WW 166...

DISCUSSION...THUNDERSTORMS ARE EXPECTED TO DEVELOP AND INTENSIFY
RAPIDLY IN THE NEXT COUPLE OF HOURS ACROSS PARTS OF NORTHWEST KS AND
WEST CENTRAL NEB.  THIS AREA IS NEAR SURFACE TRIPLE-POINT WHERE
SUBSTANTIALLY BACKED LOW LEVEL WINDS AND STEEP LOW LEVEL LAPSE RATES
WILL PROMOTE TORNADO THREAT.  SUPERCELLS CAPABLE OF LARGE HAIL AND
DAMAGING WINDS ARE ALSO EXPECTED.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
450. MEAN STORM MOTION VECTOR 22025.


...HART

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 14, 10:43 AM CDTTornado Watch PDSSPCHitchcock, Red Willow7 hr
Apr 14, 11:27 AM CDTMesoscale DiscussionSPCAdams, Buffalo, Clay, Fillmore, Franklin, Furnas and 19 more2 hr
Apr 14, 12:00 PM CDTTornado Watch PDSSPCAdams, Antelope, Boone, Buffalo, Burt, Butler and 46 more7 hr
Apr 14, 1:41 PM CDTMesoscale DiscussionSPCArthur, Custer, Dawson, Frontier, Garden, Grant and 9 more2 hr
Apr 14, 2:15 PM CDTMesoscale DiscussionSPCAdams, Burt, Butler, Cass, Clay, Colfax and 22 more90 min
Apr 14, 4:47 PM CDTMesoscale DiscussionSPCCass, Douglas, Gage, Johnson, Lancaster, Nemaha and 5 more58 min
Apr 14, 5:24 PM CDTTornado Watch PDSSPCHitchcock, Red Willow9 hr
Apr 14, 6:27 PM CDTTornado Watch PDSSPCAdams, Buffalo, Cass, Clay, Dawson, Fillmore and 30 more9 hr
Apr 14, 6:57 PM CDTMesoscale DiscussionSPCAdams, Buffalo, Butler, Cass, Clay, Douglas and 26 more63 min

Nearby

Tornado Watches in Nebraska, 2012Every tornado watch in 2012

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.