Alert archive / Nebraska / Tornado Warnings in 2013

Tornado Warning 20, NWS North Platte, NE

June 21, 2013Sheridan County, Nebraska

NWS North Platte, NE issued this tornado warning at Jun 21, 2013, 5:55 PM MDT for Sheridan County, Nebraska. It was in force for 35 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
Jun 21, 2013, 5:55 PM MDT (23:55 UTC)
Expired
Jun 21, 2013, 6:30 PM MDT
In force
35 min
Issued by
NWS North Platte, NE
Area
Storm-based polygon
Tornado
Radar indicated
Hail
1.5 in

County Sheridan County, NE

The radar

The Rapid City radar (KUDX), 145 km from the middle of the area, began a volume at 23:57 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
Jun 21, 1:48 PM MDTSevere Thunderstorm WatchSPC8 hr
Jun 21, 5:31 PM MDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 11.9 hours before the alert went out and 140 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, Rapid City, SD at 12:00Z on 2013-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1809 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, Rapid City, SD at 12:00Z on 2013-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 66 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
1809 J/kg
Mixed-layer CIN
-22 J/kg
Mixed-layer LCL
494 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
66 m²/s²
0-3 km storm-relative helicity
287 m²/s²
Significant tornado parameter
0.6
Supercell composite
3.1

Open this sounding in Storm Lab

The text

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

242 
WFUS53 KLBF 212355
TORLBF
NEC161-220030-
/O.NEW.KLBF.TO.W.0020.130621T2355Z-130622T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
555 PM MDT FRI JUN 21 2013

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* TORNADO WARNING FOR...
  NORTH CENTRAL SHERIDAN COUNTY IN THE PANHANDLE OF NEBRASKA...

* UNTIL 630 PM MDT

* AT 551 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR CLINTON...AND MOVING SOUTHWEST AT 5 MPH.

  HAZARD...TORNADO AND PING PONG BALL SIZE HAIL.

  SOURCE...RADAR INDICATED ROTATION.

  IMPACT...MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE TO
           ROOFS...WINDOWS AND VEHICLES WILL OCCUR. FLYING DEBRIS
           WILL BE DEADLY TO PEOPLE AND ANIMALS. TREE DAMAGE IS
           LIKELY.

* LOCATIONS IMPACTED INCLUDE...
  CLINTON.

THIS INCLUDES HIGHWAY 20 BETWEEN MILE MARKERS 97 AND 99.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4295 10239 4292 10217 4274 10235 4277 10253
TIME...MOT...LOC 2355Z 053DEG 3KT 4282 10239

TORNADO...RADAR INDICATED
HAIL...1.50IN

$$

ROBERG
2 follow-up statements
340 
WWUS53 KLBF 220006
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
706 PM CDT FRI JUN 21 2013

NEC161-220030-
/O.CON.KLBF.TO.W.0020.000000T0000Z-130622T0030Z/
SHERIDAN NE-
606 PM MDT FRI JUN 21 2013

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTH CENTRAL SHERIDAN
COUNTY UNTIL 630 PM MDT...

AT 600 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED 5 MILES NORTHWEST OF CLINTON...AND MOVING NORTH AT 5 MPH.

HAZARD...TORNADO AND HALF DOLLAR SIZE HAIL.

SOURCE...RADAR INDICATED ROTATION.

IMPACT...MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE TO
         ROOFS...WINDOWS AND VEHICLES WILL OCCUR. FLYING DEBRIS WILL
         BE DEADLY TO PEOPLE AND ANIMALS. TREE DAMAGE IS LIKELY.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF NORTHERN SHERIDAN COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4277 10234 4281 10250 4295 10239 4292 10217
TIME...MOT...LOC 0006Z 188DEG 5KT 4283 10239

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

ROBERG
031 
WWUS53 KLBF 220019
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
719 PM CDT FRI JUN 21 2013

NEC161-220030-
/O.CAN.KLBF.TO.W.0020.000000T0000Z-130622T0030Z/
SHERIDAN NE-
619 PM MDT FRI JUN 21 2013

...THE TORNADO WARNING FOR NORTH CENTRAL SHERIDAN COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED OUT OF
THE WARNED AREA.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 9 PM MDT.

LAT...LON 4277 10234 4281 10250 4295 10239 4292 10217
TIME...MOT...LOC 0020Z 188DEG 5KT 4285 10239

$$

ROBERG

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 20, 8:22 PM MDTSevere Thunderstorm WarningLBFFrontier38 min
Jun 21, 12:25 AM MDTSevere Thunderstorm WarningLBFFrontier50 min
Jun 21, 4:24 PM MDTSevere Thunderstorm WarningLBFDeuel51 min
Jun 21, 4:43 PM MDTSevere Thunderstorm WarningLBFSheridan62 min
Jun 21, 5:14 PM MDTSevere Thunderstorm WarningLBFDeuel61 min
Jun 21, 5:19 PM MDTSevere Thunderstorm WarningLBFCherry, Sheridan56 min
Jun 21, 5:39 PM MDTTornado Warning Tornado observedLBFCherry, Sheridan36 min
Jun 21, 5:56 PM MDTSevere Thunderstorm WarningLBFKeith, Perkins49 min

Nearby

Tornado Warnings in Nebraska, 2013Every tornado warning in 2013Tornadoes in 2013

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.