Alert archive / Nebraska / Tornado Warnings in 2012

Tornado Warning 7, NWS North Platte, NE

April 12, 2012Perkins County, Nebraska

NWS North Platte, NE issued this tornado warning at Apr 12, 2012, 5:55 PM MDT for Perkins 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: Apr 12, 2012, 5:55 PM MDT (23:55 UTC)
Expired: Apr 12, 2012, 6:30 PM MDT
In force: 35 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon

County Perkins County, NE

The radar

The North Platte radar (KLNX), 146 km from the middle of the area, began a volume at 23:55 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
Apr 12, 12:47 PM MDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.9 hours before the alert went out and 83 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 665 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 179 m²/s²
0-3 km storm-relative helicity: 130 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.

874 
WFUS53 KLBF 122355
TORLBF
NEC135-130030-
/O.NEW.KLBF.TO.W.0007.120412T2355Z-120413T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
555 PM MDT THU APR 12 2012

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* TORNADO WARNING FOR...
  EASTERN PERKINS COUNTY IN SOUTHWEST NEBRASKA...

* UNTIL 630 PM MDT

* AT 550 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED 8 MILES SOUTHEAST OF GRANT...AND MOVING NORTHEAST
  AT 30 MPH.

* THIS DANGEROUS STORM WILL BE NEAR...
  MADRID AROUND 605 PM MDT.
  ELSIE AROUND 615 PM MDT.

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 4071 10179 4100 10161 4100 10139 4100 10126
      4070 10128
TIME...MOT...LOC 2355Z 216DEG 28KT 4078 10161

$$

STOPPKOTTE

1 follow-up statement

010 
WWUS53 KLBF 130018
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
718 PM CDT THU APR 12 2012

NEC135-130030-
/O.CON.KLBF.TO.W.0007.000000T0000Z-120413T0030Z/
PERKINS NE-
618 PM MDT THU APR 12 2012

...A TORNADO WARNING REMAINS IN EFFECT FOR EASTERN PERKINS COUNTY
UNTIL 630 PM MDT...

AT 613 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR ELSIE...OR 14 MILES EAST OF GRANT...MOVING
NORTHEAST AT 35 MPH.

IN ADDITION...AT 550 PM MDT TENNIS BALL SIZED HAIL WAS REPORTED 3 
MILES EAST OF GRANT WITH THIS STORM.

THIS DANGEROUS STORM WILL AFFECT MAINLY RURAL AREAS OF EASTERN
PERKINS 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 4071 10179 4100 10161 4100 10139 4100 10126
      4070 10128
TIME...MOT...LOC 0016Z 214DEG 30KT 4085 10144

$$

STOPPKOTTE

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 12, 3:36 PM MDT	Severe Thunderstorm Warning	LBF	Deuel, Garden	39 min
Apr 12, 3:39 PM MDT	Severe Thunderstorm Warning	LBF	Arthur, Keith	38 min
Apr 12, 3:43 PM MDT	Severe Thunderstorm Warning	LBF	Keith	47 min
Apr 12, 4:12 PM MDT	Severe Thunderstorm Warning	LBF	Arthur, Keith	33 min
Apr 12, 4:44 PM MDT	Severe Thunderstorm Warning	LBF	Arthur, Keith, McPherson	31 min
Apr 12, 5:13 PM MDT	Severe Thunderstorm Warning	LBF	Keith, Perkins	47 min
Apr 12, 5:14 PM MDT	Severe Thunderstorm Warning	LBF	McPherson	46 min

Nearby

Tornado Warnings in Nebraska, 2012 Every tornado warning in 2012 Tornadoes in 2012

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.