Alert archive / Wyoming / Tornado Warnings in 2011
Tornado Warning 15, NWS Cheyenne, WY
NWS Cheyenne, WY issued this tornado warning at Jul 2, 2011, 3:50 PM MDT for Converse County, Niobrara County, Wyoming. It was in force for 40 min. 1 report 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
- Jul 2, 2011, 3:50 PM MDT (21:50 UTC)
- Expired
- Jul 2, 2011, 4:30 PM MDT
- In force
- 40 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
Counties Converse County, WY, Niobrara County, WY
The radar
The Cheyenne radar (KCYS), 177 km from the middle of the area, began a volume at 21:53 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 |
|---|---|---|---|
| Jul 2, 4:25 PM MDT | HAIL 1 | Lost Springs, 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 |
|---|---|---|---|
| Jul 2, 2:13 PM MDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Rapid City, SD (KUNR), launched 12:00Z, 9.8 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.
- Mixed-layer CAPE
- 829 J/kg
- Mixed-layer CIN
- -69 J/kg
- Mixed-layer LCL
- 993 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- -3 m²/s²
- 0-3 km storm-relative helicity
- 41 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
The text
As transmitted, in the capitals the NWS used until 2016.
057
WFUS55 KCYS 022150
TORCYS
WYC009-027-022230-
/O.NEW.KCYS.TO.W.0015.110702T2150Z-110702T2230Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
350 PM MDT SAT JUL 2 2011
THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A
* TORNADO WARNING FOR...
EAST CENTRAL CONVERSE COUNTY IN EAST CENTRAL WYOMING...
SOUTHWESTERN NIOBRARA COUNTY IN EAST CENTRAL WYOMING...
* UNTIL 430 PM MDT
* AT 349 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
STORM WAS LOCATED 11 MILES WEST OF KEELINE...OR 21 MILES EAST OF
DOUGLAS...AND MOVING EAST AT 20 MPH.
* LOCATIONS IMPACTED INCLUDE...
KEELINE...MANVILLE AND LOST SPRINGS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 4283 10450 4261 10456 4260 10466 4270 10511
4287 10507
TIME...MOT...LOC 2150Z 280DEG 16KT 4277 10497
$$
MAZUR2 follow-up statements
019
WWUS55 KCYS 022207
SVSCYS
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
407 PM MDT SAT JUL 2 2011
WYC009-027-022230-
/O.CON.KCYS.TO.W.0015.000000T0000Z-110702T2230Z/
NIOBRARA WY-CONVERSE WY-
407 PM MDT SAT JUL 2 2011
...A TORNADO WARNING REMAINS IN EFFECT FOR EAST CENTRAL CONVERSE AND
EXTREME SOUTHWESTERN NIOBRARA COUNTIES UNTIL 430 PM MDT...
AT 402 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
STORM WAS LOCATED 14 MILES WEST OF KEELINE...OR 20 MILES EAST OF
DOUGLAS...MOVING SOUTHEAST AT 10 MPH.
LOCATIONS IMPACTED INCLUDE...
MAINLY RURAL AREAS OF SOUTHEASTERN CONVERSE AND SOUTHWESTERN
NIOBRARA COUNTIES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.
&&
LAT...LON 4279 10504 4282 10485 4264 10483 4268 10501
4270 10511 4271 10511
TIME...MOT...LOC 2207Z 337DEG 8KT 4270 10501
$$
MAZUR358
WWUS55 KCYS 022223
SVSCYS
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
423 PM MDT SAT JUL 2 2011
WYC009-027-022233-
/O.EXP.KCYS.TO.W.0015.000000T0000Z-110702T2230Z/
NIOBRARA WY-CONVERSE WY-
423 PM MDT SAT JUL 2 2011
...THE TORNADO WARNING FOR EAST CENTRAL CONVERSE AND SOUTHWESTERN
NIOBRARA COUNTIES WILL EXPIRE AT 430 PM MDT...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA. HOWEVER SMALL HAIL AND GUSTY WINDS ARE STILL POSSIBLE WITH
THIS THUNDERSTORM.
IN ADDITION...STRONG THUNDERSTORMS MAY REDEVELOP...AND A TORNADO
WATCH REMAINS IN EFFECT UNTIL 10 PM MDT.
LAT...LON 4279 10504 4282 10485 4264 10483 4268 10501
4270 10511 4271 10511
TIME...MOT...LOC 2223Z 337DEG 8KT 4267 10499
$$
MAZURThe office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 2, 3:15 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Laramie, Platte | 25 min |
| Jul 2, 4:22 PM MDT | Tornado Warning | CYS | Converse, Platte | 38 min |
| Jul 2, 4:29 PM MDT | Severe Thunderstorm Warning | CYS | Converse, Niobrara | 46 min |
| Jul 2, 4:42 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Niobrara, Platte | 48 min |
| Jul 2, 5:01 PM MDT | Tornado Warning | CYS | Platte | 31 min |
| Jul 2, 5:30 PM MDT | Severe Thunderstorm Warning | CYS | Converse, Goshen, Niobrara, Platte | 45 min |
| Jul 2, 5:40 PM MDT | Severe Thunderstorm Warning | CYS | Niobrara | 37 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.