Alert archive / Wyoming / Tornado Warnings in 2011
Tornado Warning 7, NWS Cheyenne, WY
NWS Cheyenne, WY issued this tornado warning at Jun 12, 2011, 2:56 PM MDT for Niobrara County, Wyoming. It was in force for 34 min. 3 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, 2011, 2:56 PM MDT (20:56 UTC)
- Expired
- Jun 12, 2011, 3:30 PM MDT
- In force
- 34 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
County Niobrara County, WY
The radar
The Rapid City radar (KUDX), 140 km from the middle of the area, began a volume at 20:59 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, 2:58 PM MDT | TORNADO | Mule Creek Junction, WY | |
| Jun 12, 3:10 PM MDT | TORNADO | 9 Se Mule Creek Junctio, WY | |
| Jun 12, 3:30 PM MDT | TORNADO | Mule Creek Junction, WY |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Rapid City, SD (KUNR), launched 12:00Z, 8.9 hours before the alert went out and 133 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.
- Mixed-layer CAPE
- 15 J/kg
- Mixed-layer CIN
- -237 J/kg
- Mixed-layer LCL
- 1880 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 48 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
066 WFUS55 KCYS 122056 TORCYS WYC027-122130- /O.NEW.KCYS.TO.W.0007.110612T2056Z-110612T2130Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 256 PM MDT SUN JUN 12 2011 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * TORNADO WARNING FOR... NORTHEASTERN NIOBRARA COUNTY IN EAST CENTRAL WYOMING... * UNTIL 330 PM MDT * AT 251 PM MDT...LOCAL LAW ENFORCEMENT REPORTED A TORNADO NEAR REDBIRD...OR 22 MILES WEST OF EDGEMONT. DOPPLER RADAR SHOWED THIS TORNADO MOVING EAST AT 10 MPH. * LOCATIONS IMPACTED INCLUDE... MULE CREEK JUNCTION. PRECAUTIONARY/PREPAREDNESS ACTIONS... TO REPEAT...A TORNADO IS ON THE GROUND. 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 4349 10408 4311 10405 4308 10431 4344 10434 TIME...MOT...LOC 2056Z 257DEG 7KT 4323 10424 $$ GRIFFITH
2 follow-up statements
599 WWUS55 KCYS 122112 SVSCYS SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 312 PM MDT SUN JUN 12 2011 WYC027-122130- /O.CON.KCYS.TO.W.0007.000000T0000Z-110612T2130Z/ NIOBRARA WY- 312 PM MDT SUN JUN 12 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHEASTERN NIOBRARA COUNTY UNTIL 330 PM MDT... AT 308 PM MDT...LOCAL LAW ENFORCEMENT REPORTED A TORNADO. THIS TORNADO WAS LOCATED NEAR NORTHEAST OF REDBIRD...OR 15 MILES WEST OF EDGEMONT...MOVING EAST AT 10 MPH. LOCATIONS IMPACTED INCLUDE... MULE CREEK JUNCTION. PRECAUTIONARY/PREPAREDNESS ACTIONS... TO REPEAT...A TORNADO IS ON THE GROUND. TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS. && LAT...LON 4349 10408 4311 10405 4308 10431 4344 10434 TIME...MOT...LOC 2112Z 257DEG 7KT 4324 10420 $$ TJT
306 WWUS55 KCYS 122128 SVSCYS SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 328 PM MDT SUN JUN 12 2011 WYC027-122137- /O.EXP.KCYS.TO.W.0007.000000T0000Z-110612T2130Z/ NIOBRARA WY- 328 PM MDT SUN JUN 12 2011 ...THE TORNADO WARNING FOR NORTHEASTERN NIOBRARA COUNTY WILL EXPIRE AT 330 PM MDT... THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED AREA. TO REPORT ANY SEVERE WEATHER THAT OCCURRED WITH THIS THUNDERSTORM...CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN CHEYENNE. LAT...LON 4349 10408 4311 10405 4308 10431 4344 10434 TIME...MOT...LOC 2127Z 257DEG 7KT 4325 10416 $$ TJT
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 12, 3:07 PM MDT | Tornado Warning | CYS | Niobrara | 27 min |
Nearby
Tornado Warnings in Wyoming, 2011Every tornado warning in 2011Tornadoes in 2011
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.