Alert archive / Nebraska / Tornado Warnings in 2017

Tornado Warning 13, NWS North Platte, NE

August 12, 2017Perkins County, Nebraska

NWS North Platte, NE issued this tornado warning at Aug 12, 2017, 6:44 PM MDT for Perkins County, Nebraska. It was in force for 17 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 12, 2017, 6:44 PM MDT (00:44 UTC)
Expired
Aug 12, 2017, 7:01 PM MDT
In force
17 min
Issued by
NWS North Platte, NE
Area
Storm-based polygon
Tornado
Radar indicated
Hail
1.0 in

County Perkins County, NE

The radar

The North Platte radar (KLNX), 161 km from the middle of the area, began a volume at 00:48 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 12, 2:59 PM MDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 0.7 hours before the alert went out and 117 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 2017-08-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 815 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°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 2017-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 78 square meters per square second.1939587897Sfc1 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
815 J/kg
Mixed-layer CIN
-18 J/kg
Mixed-layer LCL
1218 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
78 m²/s²
0-3 km storm-relative helicity
240 m²/s²
Significant tornado parameter
0.5
Supercell composite
6.6

Open this sounding in Storm Lab

The text

As transmitted.

630 
WFUS53 KLBF 130044
TORLBF
NEC135-130115-
/O.NEW.KLBF.TO.W.0013.170813T0044Z-170813T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service North Platte NE
644 PM MDT SAT AUG 12 2017

The National Weather Service in North Platte has issued a

* Tornado Warning for...
  Northwestern Perkins County in southwestern Nebraska...

* Until 715 PM MDT

* At 644 PM MDT, a severe thunderstorm capable of producing a tornado
  was located 8 miles southeast of Big Springs, moving southeast at
  10 mph.

  HAZARD...Tornado and quarter size hail. 

  SOURCE...Weather spotters reported funnel cloud. 

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely. 

* This tornadic thunderstorm will remain over mainly rural areas of
  northwestern Perkins County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4100 10205 4101 10199 4100 10196 4090 10178
      4083 10205
TIME...MOT...LOC 0044Z 304DEG 9KT 4096 10199 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

CDC
2 follow-up statements
956 
WWUS53 KLBF 130054
SVSLBF

Severe Weather Statement
National Weather Service North Platte NE
654 PM MDT SAT AUG 12 2017

NEC135-130115-
/O.CON.KLBF.TO.W.0013.000000T0000Z-170813T0115Z/
Perkins NE-
654 PM MDT SAT AUG 12 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM MDT FOR
NORTHWESTERN PERKINS COUNTY...
    
At 654 PM MDT, a severe thunderstorm capable of producing a tornado
was located 10 miles south of Brule, or 11 miles northwest of Grant,
moving east at 25 mph.

HAZARD...Tornado and quarter size hail. 

SOURCE...Radar indicated rotation. 

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely. 

This tornadic thunderstorm will remain over mainly rural areas of
northwestern Perkins County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4100 10196 4090 10178 4085 10196
TIME...MOT...LOC 0054Z 274DEG 22KT 4095 10189 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

CDC
649 
WWUS53 KLBF 130101
SVSLBF

Severe Weather Statement
National Weather Service North Platte NE
701 PM MDT SAT AUG 12 2017

NEC135-130111-
/O.CAN.KLBF.TO.W.0013.000000T0000Z-170813T0115Z/
Perkins NE-
701 PM MDT SAT AUG 12 2017

...THE TORNADO WARNING FOR NORTHWESTERN PERKINS COUNTY IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore the warning has been cancelled.  However gusty winds are
still possible with this thunderstorm.

A severe thunderstorm watch remains in effect until 1100 PM MDT for
southwestern Nebraska.

LAT...LON 4100 10196 4090 10178 4085 10196
TIME...MOT...LOC 0059Z 304DEG 9KT 4094 10187 

$$

CDC

The office that day

Everything else NWS North Platte, NE issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 12, 6:00 PM MDTSevere Thunderstorm WarningLBFBrown45 min
Aug 12, 6:05 PM MDTTornado WarningLBFCuster25 min
Aug 12, 6:14 PM MDTSevere Thunderstorm WarningLBFLoup, Rock31 min
Aug 12, 6:23 PM MDTSpecial Weather StatementLBFKeith, Lincoln52 min
Aug 12, 6:25 PM MDTSevere Thunderstorm WarningLBFCuster50 min
Aug 12, 6:40 PM MDTSevere Thunderstorm WarningLBFBlaine, Brown50 min
Aug 12, 6:52 PM MDTSpecial Weather StatementLBFHayes53 min
Aug 12, 7:06 PM MDTSevere Thunderstorm WarningLBFCuster39 min
Aug 12, 7:08 PM MDTSevere Thunderstorm WarningLBFLincoln52 min
Aug 12, 7:13 PM MDTAreal Flood AdvisoryLBFLincoln2 hr
Aug 12, 7:15 PM MDTAreal Flood AdvisoryLBFCuster2 hr
Aug 12, 7:18 PM MDTSpecial Weather StatementLBFLoup42 min
Aug 12, 7:23 PM MDTFlash Flood WarningLBFHayes6 hr
Aug 12, 7:30 PM MDTAreal Flood AdvisoryLBFCuster2 hr
Aug 12, 7:37 PM MDTAreal Flood AdvisoryLBFCuster113 min
Aug 12, 7:41 PM MDTSevere Thunderstorm WarningLBFCuster49 min
Aug 12, 7:50 PM MDTSpecial Weather StatementLBFLoup40 min
Aug 12, 7:53 PM MDTSpecial Weather StatementLBFLincoln52 min
Aug 12, 8:08 PM MDTSevere Thunderstorm WarningLBFCuster39 min
Aug 12, 8:19 PM MDTSevere Thunderstorm WarningLBFBlaine, Custer, Loup41 min
Aug 12, 8:24 PM MDTFlash Flood WarningLBFCuster6 hr
Aug 13, 6:09 AM MDTDense Fog AdvisoryLBFChase, Deuel, Frontier, Hayes, Keith, Lincoln and 1 more3 hr
Aug 13, 3:17 PM MDTSpecial Weather StatementLBFBlaine43 min
Aug 13, 3:33 PM MDTSevere Thunderstorm WarningLBFBlaine, Custer42 min
Aug 13, 3:37 PM MDTSpecial Weather StatementLBFLogan38 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, 4:28 PM MDTSpecial Weather StatementLBFPerkins47 min
Aug 13, 4:37 PM MDTSpecial Weather StatementLBFLogan38 min
Aug 13, 4:40 PM MDTSpecial Weather StatementLBFLoup50 min
Aug 13, 4:43 PM MDTSevere Thunderstorm WarningLBFCuster47 min
Aug 13, 4:56 PM MDTSpecial Weather StatementLBFLoup49 min
Aug 13, 5:02 PM MDTSpecial Weather StatementLBFLogan43 min
Aug 13, 5:23 PM MDTSevere Thunderstorm WarningLBFCuster52 min
Aug 13, 5:26 PM MDTSpecial Weather StatementLBFLoup49 min
Aug 13, 5:30 PM MDTSevere Thunderstorm WarningLBFCuster45 min
Aug 13, 5:32 PM MDTFlash Flood WarningLBFCuster8 hr
Aug 13, 5:39 PM MDTSevere Thunderstorm WarningLBFCuster51 min
Aug 13, 5:44 PM MDTSevere Thunderstorm WarningLBFBlaine, Loup46 min
Aug 13, 5:49 PM MDTSpecial Weather StatementLBFBoyd41 min

Nearby

Tornado Warnings in Nebraska, 2017Every tornado warning in 2017Tornadoes 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.