Alert archive / Nebraska / Tornado Warnings in 2007

Tornado Warning 24, NWS North Platte, NE

April 21, 2007Garden County, Sheridan County, Nebraska

NWS North Platte, NE issued this tornado warning at Apr 21, 2007, 4:57 PM MDT for Garden County, Sheridan County, Nebraska. It was in force for 33 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Apr 21, 2007, 4:57 PM MDT (22:57 UTC)
Expired
Apr 21, 2007, 5:30 PM MDT
In force
33 min
Issued by
NWS North Platte, NE
Area
Counties, with a storm outline in the text

Counties Garden County, NE, Sheridan County, NE

The radar

The North Platte radar (KLNX), 158 km from the middle of the area, began a volume at 22:57 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.

What was reported inside it

TimeReportWhereRemark
Apr 21, 5:15 PM MDTHAIL 1.25Ellsworth, NE

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

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

IssuedProductOfficeLasted
Apr 21, 12:57 PM MDTTornado WatchSPC9 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.0 hours before the alert went out and 183 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 2007-04-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 58 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 12:00Z on 2007-04-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 284 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
58 J/kg
Mixed-layer CIN
-409 J/kg
Mixed-layer LCL
1516 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
284 m²/s²
0-3 km storm-relative helicity
277 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.

000 
WFUS53 KLBF 212257
TORLBF
NEC069-161-212330-
/O.NEW.KLBF.TO.W.0024.070421T2257Z-070421T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
457 PM MDT SAT APR 21 2007

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN GARDEN COUNTY IN THE PANHANDLE OF NEBRASKA...
  SOUTHERN SHERIDAN COUNTY IN THE PANHANDLE OF NEBRASKA...

* UNTIL 530 PM MDT

* AT 447 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR TRALNOR
  LAKE...OR ABOUT 26 MILES SOUTHEAST OF ALLIANCE...MOVING NORTH AT 20
  MPH.

* THE TORNADO WILL BE NEAR...
  8 MILES EAST OF MILES LAKE BY 505 PM MDT...
  HERMAN LAKE BY 515 PM MDT...
  PATTERSON LAKE BY 520 PM MDT...
  LAKESIDE BY 525 PM MDT...
  8 MILES EAST OF ANTIOCH AND 9 MILES WEST OF ELLSWORTH BY 530 PM
  MDT...

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING 
GOLF BALL SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS.

WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS
THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY
ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU
ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE
LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS. IF DRIVING...DO
NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

LAT...LON 4177 10259 4179 10238 4226 10217 4225 10272

$$

CDC/BT
1 follow-up statement
000 
WWUS53 KLBF 212314
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
614 PM CDT SAT APR 21 2007

NEC069-161-212330-
/O.CON.KLBF.TO.W.0024.000000T0000Z-070421T2330Z/
GARDEN NE-SHERIDAN NE-
514 PM MDT SAT APR 21 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM MDT FOR SOUTHERN
SHERIDAN AND NORTHWESTERN GARDEN COUNTIES...

AT 507 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A TORNADO.  THIS TORNADO WAS LOCATED NEAR HERMAN LAKE...OR
ABOUT 27 MILES SOUTHEAST OF ALLIANCE...MOVING NORTHEAST AT 30 MPH.

THE TORNADO WILL BE NEAR...
  7 MILES SOUTHEAST OF LAKESIDE BY 520 PM MDT...
  ELLSWORTH BY 525 PM MDT...
  KENNEDY LAKE AND 9 MILES SOUTH OF HIGHWAY 27 MILE MARKER 180 BY 530
  PM MDT...

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING 
GOLF BALL SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS.

WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS
THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY
ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU
ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE
LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS. IF DRIVING...DO
NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

LAT...LON 4177 10259 4179 10238 4226 10217 4225 10272

$$

CDC/BT

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 20, 6:36 PM MDTSevere Thunderstorm WarningLBFHayes, Lincoln54 min
Apr 20, 7:23 PM MDTSevere Thunderstorm WarningLBFFrontier, Lincoln67 min
Apr 20, 8:11 PM MDTSevere Thunderstorm WarningLBFLincoln64 min
Apr 20, 8:23 PM MDTTornado WarningLBFFrontier, Lincoln37 min
Apr 20, 8:50 PM MDTSevere Thunderstorm WarningLBFCuster40 min
Apr 20, 8:53 PM MDTTornado WarningLBFLincoln37 min
Apr 20, 9:00 PM MDTSevere Thunderstorm WarningLBFLincoln30 min
Apr 20, 9:19 PM MDTSevere Thunderstorm WarningLBFCuster26 min
Apr 20, 9:26 PM MDTTornado WarningLBFCuster34 min
Apr 20, 9:30 PM MDTSevere Thunderstorm WarningLBFMcPherson45 min
Apr 20, 9:52 PM MDTSevere Thunderstorm WarningLBFCuster53 min
Apr 20, 9:57 PM MDTTornado WarningLBFCuster48 min
Apr 20, 10:07 PM MDTSevere Thunderstorm WarningLBFLogan, McPherson, Thomas53 min
Apr 20, 10:12 PM MDTSevere Thunderstorm WarningLBFHooker33 min
Apr 20, 10:27 PM MDTSevere Thunderstorm WarningLBFCuster63 min
Apr 20, 10:35 PM MDTSevere Thunderstorm WarningLBFCherry55 min
Apr 20, 11:03 PM MDTSevere Thunderstorm WarningLBFCuster27 min
Apr 20, 11:27 PM MDTTornado WarningLBFCherry33 min
Apr 20, 11:58 PM MDTSevere Thunderstorm WarningLBFGarfield47 min
Apr 21, 2:54 AM MDTWind AdvisoryLBFBlaine, Boyd, Brown, Chase, Custer, Frontier and 13 more9 hr
Apr 21, 3:55 PM MDTSevere Thunderstorm WarningLBFCherry50 min
Apr 21, 3:59 PM MDTSevere Thunderstorm WarningLBFCherry46 min
Apr 21, 4:34 PM MDTTornado WarningLBFCherry26 min
Apr 21, 4:35 PM MDTTornado WarningLBFCherry25 min
Apr 21, 4:39 PM MDTSevere Thunderstorm WarningLBFBrown, Keya Paha51 min
Apr 21, 4:40 PM MDTSevere Thunderstorm WarningLBFDeuel50 min
Apr 21, 4:59 PM MDTSevere Thunderstorm WarningLBFCherry31 min
Apr 21, 5:00 PM MDTSevere Thunderstorm WarningLBFCherry60 min
Apr 21, 5:10 PM MDTSevere Thunderstorm WarningLBFGarden35 min
Apr 21, 5:26 PM MDTSevere Thunderstorm WarningLBFBrown, Keya Paha64 min
Apr 21, 5:27 PM MDTSevere Thunderstorm WarningLBFCherry48 min
Apr 21, 5:27 PM MDTTornado WarningLBFGarden, Sheridan33 min
Apr 21, 5:28 PM MDTSevere Thunderstorm WarningLBFDeuel32 min
Apr 21, 5:35 PM MDTSevere Thunderstorm WarningLBFArthur25 min
Apr 21, 5:53 PM MDTSevere Thunderstorm WarningLBFGrant52 min
Apr 21, 5:57 PM MDTSevere Thunderstorm WarningLBFDeuel, Garden, Keith63 min

Nearby

Tornado Warnings in Nebraska, 2007Every tornado warning in 2007Tornadoes in 2007

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.