Alert archive / Wyoming / Tornado Warnings in 2015

Tornado Warning 10, NWS Cheyenne, WY

June 25, 2015Goshen County, Niobrara County, Wyoming

NWS Cheyenne, WY issued this tornado warning at Jun 25, 2015, 10:36 AM MDT for Goshen County, Niobrara County, Wyoming. It was in force for 24 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 25, 2015, 10:36 AM MDT (16:36 UTC)
Expired: Jun 25, 2015, 11:00 AM MDT
In force: 24 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Goshen County, WY, Niobrara County, WY

The radar

The Cheyenne radar (KCYS), 156 km from the middle of the area, began a volume at 16:36 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 nearest sounding before it

Rapid City, SD (KRAP), launched 12:00Z, 4.6 hours before the alert went out and 211 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: 404 J/kg
Mixed-layer CIN: -133 J/kg
Mixed-layer LCL: 876 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 112 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

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

236 
WFUS55 KCYS 251636
TORCYS
WYC015-027-251700-
/O.NEW.KCYS.TO.W.0010.150625T1636Z-150625T1700Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
1036 AM MDT THU JUN 25 2015

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN NIOBRARA COUNTY IN EAST CENTRAL WYOMING...
  NORTH CENTRAL GOSHEN COUNTY IN SOUTHEASTERN WYOMING...

* UNTIL 1100 AM MDT
    
* AT 1036 AM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR JAY EM...OR 15 MILES SOUTH OF LUSK...
  MOVING SOUTHEAST AT 40 MPH.

  HAZARD...TORNADO AND QUARTER 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...
  JAY EM AROUND 1045 AM MDT.
  PRAIRIE CENTER AROUND 1050 AM 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 IN A MOBILE
HOME...A VEHICLE OR OUTDOORS...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 4256 10453 4261 10448 4257 10411 4232 10430
TIME...MOT...LOC 1636Z 311DEG 33KT 4254 10441 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

CLAYCOMB

2 follow-up statements

157 
WWUS55 KCYS 251653
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1053 AM MDT THU JUN 25 2015

WYC027-251703-
/O.CAN.KCYS.TO.W.0010.000000T0000Z-150625T1700Z/
NIOBRARA WY-
1053 AM MDT THU JUN 25 2015

...THE TORNADO WARNING FOR SOUTHERN NIOBRARA COUNTY IS CANCELLED...
    
THE TORNADIC THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED OUT 
OF THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.

LAT...LON 4251 10448 4258 10446 4253 10416 4232 10430
TIME...MOT...LOC 1653Z 309DEG 21KT 4247 10434 

$$

WYC015-251700-
/O.CON.KCYS.TO.W.0010.000000T0000Z-150625T1700Z/
GOSHEN WY-
1053 AM MDT THU JUN 25 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1100 AM MDT FOR NORTH
CENTRAL GOSHEN COUNTY...
    
AT 1053 AM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED OVER JAY EM...OR 20 MILES SOUTH OF LUSK...MOVING
SOUTHEAST AT 25 MPH.

HAZARD...TORNADO AND QUARTER 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 TORNADIC THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF
NORTH CENTRAL GOSHEN COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

&&

LAT...LON 4251 10448 4258 10446 4253 10416 4232 10430
TIME...MOT...LOC 1653Z 309DEG 21KT 4247 10434 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

CLAYCOMB

078 
WWUS55 KCYS 251658
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1058 AM MDT THU JUN 25 2015

WYC015-251707-
/O.EXP.KCYS.TO.W.0010.000000T0000Z-150625T1700Z/
GOSHEN WY-
1058 AM MDT THU JUN 25 2015

...THE TORNADO WARNING FOR NORTH CENTRAL GOSHEN COUNTY WILL EXPIRE AT
1100 AM MDT...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER APPEARS CAPABLE OF PRODUCING A TORNADO.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.  HOWEVER HEAVY RAIN 
IS STILL POSSIBLE WITH THIS THUNDERSTORM. THIS STORM HAS A HISTORY 
OF WEAKENING AND THEN REINTENSIFYING...SO FURTHER WARNINGS MAY BE 
NEEDED LATER.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
CHEYENNE.

LAT...LON 4251 10448 4258 10446 4253 10416 4232 10430
TIME...MOT...LOC 1654Z 311DEG 33KT 4247 10434 

$$

CLAYCOMB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 24, 6:32 PM MDT	Special Weather Statement	CYS	Converse	43 min
Jun 24, 7:11 PM MDT	Special Weather Statement	CYS	Converse	34 min
Jun 24, 8:14 PM MDT	Special Weather Statement	CYS	Platte	46 min
Jun 24, 10:06 PM MDT	Special Weather Statement	CYS	Goshen	24 min
Jun 24, 10:13 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	27 min
Jun 25, 1:27 AM MDT	Special Weather Statement	CYS	Converse	63 min
Jun 25, 2:12 AM MDT	Special Weather Statement	CYS	Converse	48 min
Jun 25, 2:27 AM MDT	Severe Thunderstorm Warning	CYS	Converse, Niobrara	63 min
Jun 25, 2:47 AM MDT	Special Weather Statement	CYS	Converse	43 min
Jun 25, 3:35 AM MDT	Special Weather Statement	CYS	Niobrara	40 min
Jun 25, 7:42 AM MDT	Severe Thunderstorm Warning	CYS	Converse	33 min
Jun 25, 8:08 AM MDT	Severe Thunderstorm Warning	CYS	Converse	52 min
Jun 25, 8:46 AM MDT	Severe Thunderstorm Warning	CYS	Converse	44 min
Jun 25, 9:23 AM MDT	Severe Thunderstorm Warning	CYS	Converse, Niobrara	37 min
Jun 25, 9:58 AM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara, Platte	47 min
Jun 25, 2:02 PM MDT	Special Weather Statement	CYS	Laramie	28 min
Jun 25, 2:31 PM MDT	Special Weather Statement	CYS	Laramie	29 min
Jun 25, 2:33 PM MDT	Special Weather Statement	CYS	Laramie	27 min
Jun 25, 2:57 PM MDT	Special Weather Statement	CYS	Laramie	33 min
Jun 25, 3:01 PM MDT	Special Weather Statement	CYS	Niobrara	44 min
Jun 25, 3:29 PM MDT	Special Weather Statement	CYS	Platte	46 min
Jun 25, 4:07 PM MDT	Severe Thunderstorm Warning	CYS	Platte	38 min
Jun 25, 4:23 PM MDT	Special Weather Statement	CYS	Goshen	52 min
Jun 25, 4:46 PM MDT	Special Weather Statement	CYS	Platte	44 min
Jun 25, 4:51 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	24 min

Nearby

Tornado Warnings in Wyoming, 2015 Every tornado warning in 2015 Tornadoes in 2015

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.