Alert archive / Nebraska / Tornado Warnings in 2017

Tornado Warning 24, NWS Cheyenne, WY

June 12, 2017Banner County, Morrill County, Scotts Bluff County, Nebraska

NWS Cheyenne, WY issued this tornado warning at Jun 12, 2017, 7:10 PM MDT for Banner County, Morrill County, Scotts Bluff County, Nebraska. It was in force for 35 min. 6 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: Jun 12, 2017, 7:10 PM MDT (01:10 UTC)
Expired: Jun 12, 2017, 7:45 PM MDT
In force: 35 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Tornado: Observed
Damage threat: Considerable
Hail: 0.75 in

Counties Banner County, NE, Morrill County, NE, Scotts Bluff County, NE

The radar

The Cheyenne radar (KCYS), 137 km from the middle of the area, began a volume at 01:11 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
Jun 12, 7:15 PM MDT	TSTM WND DMG	4 Nne Bayard, NE	TREES AND POWER LINES DOWN. TIME BASED ON RADAR.
Jun 12, 7:15 PM MDT	TSTM WND DMG	Bayard, NE	TREES AND POWER LINES DOWN IN BAYARD. TIME BASED ON RADAR.
Jun 12, 7:15 PM MDT	TORNADO	4 Nne Bayard, NE	TREES AND POWER LINES DOWN. HOUSES SEVERELY DAMAGED. A STORAGE SHED AND TRACTOR WERE SWEPT AWAY. POWER LINES SNAPPED. TIME BASED ON RADAR.
Jun 12, 7:15 PM MDT	TORNADO	4 Nne Bayard, NE	TREES AND POWER LINES DOWN. TIME BASED ON RADAR.
Jun 12, 7:15 PM MDT	TORNADO	Bayard, NE	LARGE TREES DOWN. ROOF LIFTED OFF A BUILDING ON THE SCHOOL PROPERTY.
Jun 12, 7:15 PM MDT	TORNADO	Bayard, NE	LARGE TREES DOWN. ROOF LIFTED OFF SCHOOL. EXTENSIVE HAIL DAMAGE.

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
Jun 12, 1:11 PM MDT	Tornado Watch PDS	SPC	8 hr

The nearest sounding before it

Denver, CO (KDEN), launched 00:00Z, 1.2 hours before the alert went out and 207 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: 108 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 3977 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 155 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

679 
WFUS55 KCYS 130110
TORCYS
NEC007-123-157-130145-
/O.NEW.KCYS.TO.W.0024.170613T0110Z-170613T0145Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Cheyenne WY
710 PM MDT MON JUN 12 2017

The National Weather Service in Cheyenne has issued a

* Tornado Warning for...
  Southeastern Scotts Bluff County in the Panhandle of Nebraska...
  West central Morrill County in the Panhandle of Nebraska...
  Northeastern Banner County in the Panhandle of Nebraska...

* Until 745 PM MDT

* At 709 PM MDT, a confirmed large and extremely dangerous tornado
  was located near Chimney Rock State Park, or 15 miles southeast of
  Scottsbluff, moving east at 25 mph.

  THIS IS A PARTICULARLY DANGEROUS SITUATION. IF IN MCGREW AND 
  BAYARD...TAKE COVER NOW! 

  HAZARD...Damaging tornado. 

  SOURCE...Weather spotters confirmed large tornado southwest of 
           Mcgrew. 

  IMPACT...You are in a life-threatening situation. Flying debris 
           may be deadly to those caught without shelter. Mobile 
           homes will be destroyed. Considerable damage to homes, 
           businesses, and vehicles is likely and complete 
           destruction is possible. 

* The tornado will be near...
  Chimney Rock State Park around 715 PM MDT. 
  Bayard and South Bayard Junction around 720 PM MDT. 
  Moomaws Corner around 725 PM MDT. 
  The Intersection Of Highway 385 And L62 around 745 PM MDT. 

Other locations impacted by this tornadic thunderstorm include
McGrew.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a large, extremely dangerous and potentially deadly
tornado is on the ground. To protect your life, TAKE COVER NOW! Move
to a basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

&&

LAT...LON 4166 10348 4177 10352 4187 10319 4169 10307
TIME...MOT...LOC 0109Z 248DEG 23KT 4173 10342 

TORNADO...OBSERVED
TORNADO DAMAGE THREAT...CONSIDERABLE
HAIL...<.75IN

$$

Hammer

The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 12, 6:06 PM MDT	Tornado Warning	CYS	Banner, Scotts Bluff	24 min
Jun 12, 6:12 PM MDT	Severe Thunderstorm Warning	CYS	Dawes, Sioux	33 min
Jun 12, 6:26 PM MDT	Tornado Warning	CYS	Scotts Bluff	34 min
Jun 12, 6:30 PM MDT	Tornado Warning Tornado observed	CYS	Banner, Scotts Bluff	30 min
Jun 12, 6:34 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	41 min
Jun 12, 6:57 PM MDT	Tornado Warning	CYS	Box Butte, Morrill, Scotts Bluff	33 min
Jun 12, 6:59 PM MDT	Tornado Warning	CYS	Banner, Morrill, Scotts Bluff	31 min
Jun 12, 7:28 PM MDT	Tornado Warning	CYS	Box Butte, Morrill, Scotts Bluff	47 min
Jun 12, 7:58 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Morrill	47 min
Jun 12, 8:07 PM MDT	Tornado Warning	CYS	Box Butte, Morrill	21 min
Jun 12, 10:02 PM MDT	Severe Thunderstorm Warning	CYS	Sioux	28 min
Jun 12, 10:23 PM MDT	Tornado Warning	CYS	Dawes, Sioux	37 min
Jun 12, 11:24 PM MDT	Special Weather Statement	CYS	Dawes	51 min
Jun 13, 12:10 AM MDT	Special Weather Statement	CYS	Dawes	50 min

Nearby

Tornado Warnings in Nebraska, 2017 Every tornado warning in 2017 Tornadoes in 2017

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.