Alert archive / Nebraska / Tornado Warnings in 2011

Tornado Warning 13, NWS North Platte, NE

May 30, 2011Custer County, Nebraska

NWS North Platte, NE issued this tornado warning at May 30, 2011, 8:14 PM CDT for Custer County, Nebraska. It was in force for 31 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: May 30, 2011, 8:14 PM CDT (01:14 UTC)
Expired: May 30, 2011, 8:45 PM CDT
In force: 31 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon

County Custer County, NE

The radar

The Grand Island radar (KUEX), 126 km from the middle of the area, began a volume at 01:15 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

Time	Report	Where	Remark
May 30, 8:20 PM CDT	TSTM WND DMG	3 Se Ansley, NE	CUSTER COUNTY EMERGENCY MANAGER REPORTED SEVERAL EMPTY GRAIN BINS BLOWN DOWN. SHERIFF SAW A BRIEF GUSTNADO TOUCHDOWN IN SAME AREA. IRRIGATION PIPES WERE STREWN ABOUT.

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.

Issued	Product	Office	Lasted
May 30, 2:08 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 1.2 hours before the alert went out and 111 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 634 J/kg
Mixed-layer CIN: -231 J/kg
Mixed-layer LCL: 2144 m above ground
0-6 km bulk shear: 79 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 144 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -1.1

Open this sounding in Storm Lab

The text

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

388 
WFUS53 KLBF 310114
TORLBF
NEC041-310145-
/O.NEW.KLBF.TO.W.0013.110531T0114Z-110531T0145Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
814 PM CDT MON MAY 30 2011

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN CUSTER COUNTY IN CENTRAL NEBRASKA...

* UNTIL 845 PM CDT

* AT 811 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED NEAR INTERSECTION OF HIGHWAY 183 AND CUMRO
  ROAD...OR 21 MILES SOUTHEAST OF BROKEN BOW...AND MOVING NORTHEAST
  AT 45 MPH.

* THIS DANGEROUS STORM WILL BE NEAR...
  MASON CITY AND ANSLEY AROUND 820 PM CDT.

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 4106 9935 4119 9949 4147 9921 4144 9920
      4139 9919 4117 9920
TIME...MOT...LOC 0114Z 222DEG 39KT 4120 9935

$$

TAYLOR

2 follow-up statements

537 
WWUS53 KLBF 310123
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
823 PM CDT MON MAY 30 2011

NEC041-310145-
/O.CON.KLBF.TO.W.0013.000000T0000Z-110531T0145Z/
CUSTER NE-
823 PM CDT MON MAY 30 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHEASTERN CUSTER COUNTY
UNTIL 845 PM CDT...

AT 820 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR MASON CITY...OR 23 MILES SOUTHEAST OF BROKEN
BOW...MOVING NORTHEAST AT 45 MPH.

THIS DANGEROUS STORM WILL AFFECT MAINLY RURAL AREAS OF SOUTHEASTERN
CUSTER 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 4106 9935 4119 9949 4147 9921 4144 9920
      4139 9919 4117 9920
TIME...MOT...LOC 0124Z 227DEG 41KT 4127 9921

$$

TAYLOR

650 
WWUS53 KLBF 310143
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
843 PM CDT MON MAY 30 2011

NEC041-310153-
/O.EXP.KLBF.TO.W.0013.000000T0000Z-110531T0145Z/
CUSTER NE-
843 PM CDT MON MAY 30 2011

...THE TORNADO WARNING FOR SOUTHEASTERN CUSTER COUNTY WILL EXPIRE AT
845 PM CDT/745 PM MDT/...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.  HOWEVER HEAVY RAIN IS STILL POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 4106 9935 4119 9949 4147 9921 4144 9920
      4139 9919 4117 9920
TIME...MOT...LOC 0143Z 227DEG 41KT 4142 9900

$$

TAYLOR

The office that day

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

Issued	Product	Office	Counties	Lasted
May 30, 7:00 PM CDT	Severe Thunderstorm Warning	LBF	Custer	45 min
May 30, 7:13 PM CDT	Tornado Warning	LBF	Boyd	17 min
May 30, 7:18 PM CDT	Severe Thunderstorm Warning	LBF	Custer, Loup	42 min
May 30, 7:39 PM CDT	Severe Thunderstorm Warning	LBF	Custer	51 min
May 30, 7:45 PM CDT	Severe Thunderstorm Warning	LBF	Custer	45 min
May 30, 7:52 PM CDT	Severe Thunderstorm Warning	LBF	Garfield, Wheeler	23 min
May 30, 7:55 PM CDT	Severe Thunderstorm Warning	LBF	Custer	50 min
May 30, 8:03 PM CDT	Severe Thunderstorm Warning	LBF	Custer	42 min

Nearby

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