Alert archive / Nebraska / Tornado Warnings in 2011

Tornado Warning 42, NWS North Platte, NE

August 10, 2011Cherry County, Nebraska

NWS North Platte, NE issued this tornado warning at Aug 10, 2011, 6:21 PM MDT for Cherry County, Nebraska. It was in force for 24 min. 4 reports 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
Aug 10, 2011, 6:21 PM MDT (00:21 UTC)
Expired
Aug 10, 2011, 6:45 PM MDT
In force
24 min
Issued by
NWS North Platte, NE
Area
Storm-based polygon

County Cherry County, NE

The radar

The North Platte radar (KLNX), 86 km from the middle of the area, began a volume at 00:22 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
Aug 10, 6:30 PM MDTHAIL 122 S Cody, NE
Aug 10, 6:40 PM MDTFUNNEL CLOUD20 Wsw Merritt Reservoi, NE
Aug 10, 6:40 PM MDTHAIL 1.7520 Wsw Merritt Reservoi, NE
Aug 10, 6:40 PM MDTHAIL 1.7527 S Cody, NEREPORTED SEEING A ROTATING WALL CLOUD JUST TO THE NORTH OF THE LOCATION.

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
Aug 10, 4:03 PM MDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 0.4 hours before the alert went out and 164 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 2011-08-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 765 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 2011-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 95 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
765 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
1073 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
95 m²/s²
0-3 km storm-relative helicity
271 m²/s²
Significant tornado parameter
1.0
Supercell composite
11.0

Open this sounding in Storm Lab

The text

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

386 
WFUS53 KLBF 110021
TORLBF
NEC031-110045-
/O.NEW.KLBF.TO.W.0042.110811T0021Z-110811T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
621 PM MDT WED AUG 10 2011

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL CHERRY COUNTY IN NORTH CENTRAL NEBRASKA...

* UNTIL 645 PM MDT

* AT 617 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED 5 MILES SOUTHWEST OF SCHOOLHOUSE LAKE...OR 43
  MILES WEST OF VALENTINE...AND MOVING SOUTH AT 20 MPH.

* THIS DANGEROUS STORM WILL AFFECT MAINLY RURAL AREAS OF CENTRAL
  CHERRY 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 4238 10118 4237 10149 4271 10146 4271 10122
TIME...MOT...LOC 0021Z 359DEG 16KT 4262 10134

$$

POWER
2 follow-up statements
702 
WWUS53 KLBF 110037
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
637 PM MDT WED AUG 10 2011

NEC031-110045-
/O.CON.KLBF.TO.W.0042.000000T0000Z-110811T0045Z/
CHERRY NE-
637 PM MDT WED AUG 10 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR CENTRAL CHERRY COUNTY
UNTIL 645 PM MDT...

AT 631 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS 
STORM WAS LOCATED 9 MILES SOUTHWEST OF SCHOOLHOUSE LAKE...OR 28 
MILES SOUTH OF CODY OR 37 MILES NORTHEAST OF WHITMAN...MOVING SOUTH 
AT 20 MPH.

THIS DANGEROUS STORM WILL AFFECT MAINLY RURAL AREAS OF CENTRAL CHERRY
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 4238 10118 4237 10149 4271 10146 4271 10122
TIME...MOT...LOC 0035Z 359DEG 16KT 4256 10134

$$

POWER
923 
WWUS53 KLBF 110044
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
644 PM MDT WED AUG 10 2011

NEC031-110054-
/O.EXP.KLBF.TO.W.0042.000000T0000Z-110811T0045Z/
CHERRY NE-
644 PM MDT WED AUG 10 2011

...THE TORNADO WARNING FOR CENTRAL CHERRY COUNTY WILL EXPIRE AT 645
PM MDT...

THE TORNADO THREAT HAS DIMINISHED...THEREFORE THE TORNADO WARNING HAS
EXPIRED. HOWEVER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT 
FOR THE AREA. 


LAT...LON 4238 10118 4237 10149 4271 10146 4271 10122
TIME...MOT...LOC 0044Z 359DEG 16KT 4252 10134

$$

POWER

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 10, 6:55 PM MDTSevere Thunderstorm WarningLBFCherry50 min
Aug 10, 7:44 PM MDTSevere Thunderstorm WarningLBFCherry, Hooker46 min
Aug 10, 8:29 PM MDTSevere Thunderstorm WarningLBFHooker, McPherson46 min
Aug 10, 8:42 PM MDTAreal Flood AdvisoryLBFHooker3 hr
Aug 10, 9:15 PM MDTSevere Thunderstorm WarningLBFMcPherson30 min

Nearby

Tornado Warnings in Nebraska, 2011Every tornado warning in 2011Tornadoes in 2011

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.