Alert archive / Nebraska / Tornado Warnings in 2011

Tornado Warning 12, NWS North Platte, NE

May 30, 2011Boyd County, Nebraska

NWS North Platte, NE issued this tornado warning at May 30, 2011, 7:13 PM CDT for Boyd 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: May 30, 2011, 7:13 PM CDT (00:13 UTC)
Expired: May 30, 2011, 7:30 PM CDT
In force: 17 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon

County Boyd County, NE

The radar

The Sioux Falls radar (KFSD), 160 km from the middle of the area, began a volume at 00:16 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.

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

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 0.2 hours before the alert went out and 231 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: 1125 J/kg
Mixed-layer CIN: -258 J/kg
Mixed-layer LCL: 775 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 174 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -1.0

Open this sounding in Storm Lab

The text

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

392 
WFUS53 KLBF 310013
TORLBF
NEC015-310030-
/O.NEW.KLBF.TO.W.0012.110531T0013Z-110531T0030Z/

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

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN BOYD COUNTY IN NORTH CENTRAL NEBRASKA...

* UNTIL 730 PM CDT

* AT 711 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED NEAR LYNCH...OR 15 MILES EAST OF SPENCER...AND
  MOVING NORTHEAST AT 50 MPH.

* THIS DANGEROUS STORM WILL AFFECT MAINLY RURAL AREAS OF SOUTHEASTERN
  BOYD 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 4276 9830 4277 9839 4278 9839 4277 9847
      4280 9862 4294 9844 4292 9836 4288 9830
TIME...MOT...LOC 0013Z 225DEG 45KT 4285 9838

$$

POWER

1 follow-up statement

374 
WWUS53 KLBF 310023
SVSLBF

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

NEC015-310033-
/O.EXP.KLBF.TO.W.0012.000000T0000Z-110531T0030Z/
BOYD NE-
723 PM CDT MON MAY 30 2011

...THE TORNADO WARNING FOR SOUTHEASTERN BOYD COUNTY WILL EXPIRE AT
730 PM CDT/630 PM MDT/...

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

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 9 PM CDT.

LAT...LON 4276 9830 4277 9839 4278 9839 4277 9847
      4280 9862 4294 9844 4292 9836 4288 9830
TIME...MOT...LOC 0023Z 225DEG 45KT 4294 9826

$$

POWER

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, 7:18 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
May 30, 8:14 PM CDT	Tornado Warning	LBF	Custer	31 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.