Alert archive / Wyoming / Tornado Warnings in 2017

Tornado Warning 12, NWS Cheyenne, WY

June 12, 2017Laramie County, Wyoming

NWS Cheyenne, WY issued this tornado warning at Jun 12, 2017, 4:51 PM MDT for Laramie County, Wyoming. It was in force for 39 min. 10 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, 4:51 PM MDT (22:51 UTC)
Expired: Jun 12, 2017, 5:30 PM MDT
In force: 39 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Tornado: Observed
Hail: 2.75 in

County Laramie County, WY

The radar

The Cheyenne radar (KCYS), 48 km from the middle of the area, began a volume at 22:53 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, 5:00 PM MDT	HAIL 1.5	4 Nne Carpenter, WY
Jun 12, 5:00 PM MDT	TORNADO	2 E Carpenter, WY	POWER LINES DOWN. MAJOR GAS LINE BROKEN. CONSIDERABLE DAMAGE WITH WIDE DEBRIS FIELD. SHUT OFF POWER.
Jun 12, 5:05 PM MDT	HAIL 1.75	5 N Carpenter, WY	DELAYED REPORT.
Jun 12, 5:05 PM MDT	TORNADO	5 N Carpenter, WY
Jun 12, 5:10 PM MDT	TORNADO	11 E Carpenter, WY	POSSIBLE TORNADO. IRRIGATION PIVOT OVERTURNED. SMALL BUILDING DAMAGE. COUNTY RDS 203 AND 61. TIME BASED ON RADAR.
Jun 12, 5:19 PM MDT	FUNNEL CLOUD	5 W Pine Bluffs, WY
Jun 12, 5:20 PM MDT	FUNNEL CLOUD	5 S Pine Bluffs, WY	DELEYED REPORT.
Jun 12, 5:23 PM MDT	FUNNEL CLOUD	3 S Pine Bluffs, WY	DELAYED REPORT.
Jun 12, 5:30 PM MDT	HAIL 3	Pine Bluffs, WY	TIME BASED ON RADAR.
Jun 12, 5:33 PM MDT	HAIL 3	Pine Bluffs, WY

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 12:00Z, 10.9 hours before the alert went out and 166 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.

748 
WFUS55 KCYS 122251
TORCYS
WYC021-122330-
/O.NEW.KCYS.TO.W.0012.170612T2251Z-170612T2330Z/

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

The National Weather Service in Cheyenne has issued a

* Tornado Warning for...
  Southeastern Laramie County in southeastern Wyoming...

* Until 530 PM MDT

* At 450 PM MDT, a confirmed tornado was located over Hereford, or 28
  miles southeast of Cheyenne, moving north at 20 mph.

  HAZARD...Damaging tornado and baseball size hail. 

  SOURCE...Public confirmed tornado. 

  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. 

* The tornado will be near...
  Carpenter around 500 PM MDT. 
  Burns around 530 PM MDT. 

This includes Interstate 80 in Wyoming between mile markers 386 and
402.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. 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 4126 10434 4123 10405 4100 10405 4100 10440
TIME...MOT...LOC 2250Z 189DEG 18KT 4098 10430 

TORNADO...OBSERVED
HAIL...2.75IN

$$

Hammer

2 follow-up statements

681 
WWUS55 KCYS 122259
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
459 PM MDT MON JUN 12 2017

WYC021-122330-
/O.CON.KCYS.TO.W.0012.000000T0000Z-170612T2330Z/
Laramie WY-
459 PM MDT MON JUN 12 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM MDT FOR
SOUTHEASTERN LARAMIE COUNTY...
    
At 457 PM MDT, a confirmed large and extremely dangerous tornado was 
located near Carpenter, or 26 miles east of Cheyenne, moving north 
at 20 mph.

THIS IS PARTICULARLY DANGEROUS SITUATION. TAKE COVER NOW! THOSE ON 
THE EAST SIDE OF CARPENTER SHOULD SEEK SHELTER IMMEDIATELY! 

HAZARD...Damaging tornado. 

SOURCE...Weather spotters confirmed large wedge tornado. 

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...
  Carpenter Now!  
  Burns around 530 PM MDT. 

This includes Interstate 80 in Wyoming between mile markers 386 and
402.
 
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.

&&

LAT...LON 4126 10434 4123 10405 4100 10405 4100 10440
TIME...MOT...LOC 2257Z 188DEG 18KT 4102 10430 

TORNADO...OBSERVED
TORNADO DAMAGE THREAT...CONSIDERABLE
HAIL...2.75IN

$$

Hammer

230 
WWUS55 KCYS 122310
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
510 PM MDT MON JUN 12 2017

WYC021-122330-
/O.CON.KCYS.TO.W.0012.000000T0000Z-170612T2330Z/
Laramie WY-
510 PM MDT MON JUN 12 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM MDT FOR
SOUTHEASTERN LARAMIE COUNTY...
    
At 508 PM MDT, a confirmed large and extremely dangerous tornado was
located near Panorama Point, or 26 miles southwest of Kimball, 
moving north at 25 mph. A second tornado was confirmed north of 
Carpenter, also moving north.

THIS IS PARTICULARLY DANGEROUS SITUATION. TAKE COVER NOW! THOSE 
AROUND PINE BLUFFS...ESPECIALLY TO THE SOUTHWEST...SHOULD SEEK 
SHELTER NOW! 

HAZARD...Damaging tornado and baseball sized hail. 

SOURCE...Weather spotters confirmed tornado. 

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...
  Pine Bluffs around 530 PM MDT. 

This includes Interstate 80 in Wyoming between mile markers 386 and
402.
 
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.

&&

LAT...LON 4126 10434 4123 10405 4100 10405 4100 10440
TIME...MOT...LOC 2308Z 201DEG 21KT 4107 10413 

TORNADO...OBSERVED
TORNADO DAMAGE THREAT...CONSIDERABLE
HAIL...2.75IN

$$

Hammer

The office that day

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

Issued	Product	Office	Counties	Lasted
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, 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, 5:12 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara	48 min
Jun 12, 5:15 PM MDT	Tornado Warning	CYS	Goshen, Laramie	30 min
Jun 12, 5:21 PM MDT	Tornado Warning	CYS	Laramie	39 min
Jun 12, 5:34 PM MDT	Tornado Warning Tornado observed	CYS	Goshen, Niobrara	41 min
Jun 12, 5:39 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	36 min
Jun 12, 5:42 PM MDT	Tornado Warning	CYS	Goshen	33 min
Jun 12, 5:52 PM MDT	Tornado Warning	CYS	Goshen, Laramie	38 min

Nearby

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.