Alert archive / Nebraska / Tornado Warnings in 2017

Tornado Warning 17, NWS Cheyenne, WY

June 12, 2017Banner County, Scotts Bluff County, Nebraska; Goshen County, Wyoming

NWS Cheyenne, WY issued this tornado warning at Jun 12, 2017, 5:42 PM MDT for Banner County, Scotts Bluff County, Nebraska; Goshen County, Wyoming. It was in force for 33 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: Jun 12, 2017, 5:42 PM MDT (23:42 UTC)
Expired: Jun 12, 2017, 6:15 PM MDT
In force: 33 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.75 in

Counties Banner County, NE, Scotts Bluff County, NE, Goshen County, WY

The radar

The Cheyenne radar (KCYS), 98 km from the middle of the area, began a volume at 23:43 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
Jun 12, 1:11 PM MDT	Tornado Watch PDS	SPC	8 hr

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 11.7 hours before the alert went out and 210 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: 697 J/kg
Mixed-layer CIN: -160 J/kg
Mixed-layer LCL: 1130 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: 153 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

235 
WFUS55 KCYS 122342
TORCYS
NEC007-157-WYC015-130015-
/O.NEW.KCYS.TO.W.0017.170612T2342Z-170613T0015Z/

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

The National Weather Service in Cheyenne has issued a

* Tornado Warning for...
  Western Scotts Bluff County in the Panhandle of Nebraska...
  Northwestern Banner County in the Panhandle of Nebraska...
  Southeastern Goshen County in southeastern Wyoming...

* Until 615 PM MDT
    
* At 542 PM MDT, a severe thunderstorm capable of producing a tornado
  was located 10 miles east of La Grange, or 21 miles southwest of
  Scottsbluff, moving northeast at 25 mph.

  HAZARD...Tornado and golf ball size hail. 

  SOURCE...Radar indicated rotation. 

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely. 

* This dangerous storm will be near...
  Gering, Hubbard Hill and Scotts Bluff National Monument around 615 
  PM MDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Cheyenne.

&&

LAT...LON 4155 10393 4167 10410 4195 10384 4177 10358
TIME...MOT...LOC 2342Z 222DEG 22KT 4166 10397 

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

Levin

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 9:32 PM MDT	Special Weather Statement	CYS	Cheyenne	43 min
Jun 12, 5:12 PM MDT	Severe Thunderstorm Warning	CYS	Sioux	48 min
Jun 12, 5:15 PM MDT	Tornado Warning	CYS	Banner, Scotts Bluff	30 min
Jun 12, 5:21 PM MDT	Tornado Warning	CYS	Banner, Kimball	39 min
Jun 12, 5:34 PM MDT	Tornado Warning Tornado observed	CYS	Sioux	41 min
Jun 12, 5:52 PM MDT	Tornado Warning	CYS	Banner, Kimball	38 min
Jun 11, 7:26 PM MDT	Special Weather Statement	CYS	Converse	49 min
Jun 11, 9:19 PM MDT	Severe Thunderstorm Warning	CYS	Converse	26 min
Jun 12, 3:50 AM MDT	High Wind Watch	CYS	Albany, Carbon	23 hr
Jun 12, 2:05 PM MDT	Severe Thunderstorm Warning	CYS	Platte	25 min
Jun 12, 2:28 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Platte	47 min
Jun 12, 2:55 PM MDT	Tornado Warning	CYS	Platte	35 min
Jun 12, 3:10 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	65 min
Jun 12, 3:11 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Converse, Platte	34 min
Jun 12, 3:26 PM MDT	Tornado Warning	CYS	Goshen, Platte	34 min
Jun 12, 3:36 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Converse	27 min
Jun 12, 3:40 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Platte	34 min
Jun 12, 3:52 PM MDT	Tornado Warning	CYS	Goshen, Platte	23 min
Jun 12, 4:12 PM MDT	Tornado Warning	CYS	Goshen, Platte	33 min
Jun 12, 4:15 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	45 min
Jun 12, 4:22 PM MDT	Tornado Warning	CYS	Laramie	23 min
Jun 12, 4:26 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	34 min
Jun 12, 4:34 PM MDT	Tornado Warning	CYS	Laramie	41 min
Jun 12, 4:41 PM MDT	Tornado Warning	CYS	Goshen	34 min
Jun 12, 4:45 PM MDT	Tornado Warning Tornado observed	CYS	Laramie	20 min
Jun 12, 4:51 PM MDT	Tornado Warning Tornado observed	CYS	Laramie	39 min
Jun 12, 5:03 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Platte	42 min
Jun 12, 5:09 PM MDT	Tornado Warning	CYS	Laramie	36 min
Jun 12, 5:39 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	36 min

Nearby

Tornado Warnings in Nebraska, 2017 Tornado Warnings in Wyoming, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.