Alert archive / Wyoming / Tornado Warnings in 2011
Tornado Warning 27, NWS Cheyenne, WY
NWS Cheyenne, WY issued this tornado warning at Jul 12, 2011, 6:03 PM MDT for Goshen County, Laramie County, Platte County, Wyoming. It was in force for 30 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
- Jul 12, 2011, 6:03 PM MDT (00:03 UTC)
- Expired
- Jul 12, 2011, 6:33 PM MDT
- In force
- 30 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
Counties Goshen County, WY, Laramie County, WY, Platte County, WY
The radar
The Cheyenne radar (KCYS), 65 km from the middle of the area, began a volume at 00:05 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
Denver, CO (KDNR), launched 00:00Z, 0.1 hours before the alert went out and 250 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
- 596 J/kg
- Mixed-layer CIN
- -61 J/kg
- Mixed-layer LCL
- 1449 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- -12 m²/s²
- 0-3 km storm-relative helicity
- 256 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.2
The text
As transmitted, in the capitals the NWS used until 2016.
622 WFUS55 KCYS 130003 TORCYS WYC015-021-031-130045- /O.NEW.KCYS.TO.W.0027.110713T0003Z-110713T0045Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 603 PM MDT TUE JUL 12 2011 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * TORNADO WARNING FOR... SOUTHWESTERN GOSHEN COUNTY IN SOUTHEAST WYOMING... NORTH CENTRAL LARAMIE COUNTY IN SOUTHEAST WYOMING... SOUTHEASTERN PLATTE COUNTY IN SOUTHEAST WYOMING... * UNTIL 645 PM MDT * AT 601 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED 11 MILES SOUTHWEST OF CHUGWATER...OR 29 MILES SOUTH OF WHEATLAND...AND MOVING NORTHEAST AT 25 MPH. * LOCATIONS IMPACTED INCLUDE... CHUGWATER...I-25 EXIT 54 AND I-25 EXIT 65. THIS INCLUDES INTERSTATE 25 IN WYOMING BETWEEN MILE MARKERS 38 AND 69. 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. TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN CHEYENNE. && LAT...LON 4194 10499 4170 10440 4151 10489 4160 10510 TIME...MOT...LOC 0003Z 211DEG 22KT 4164 10493 $$ CLAYCOMB
2 follow-up statements
635 WWUS55 KCYS 130027 SVSCYS SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 627 PM MDT TUE JUL 12 2011 WYC015-021-031-130045- /O.CON.KCYS.TO.W.0027.000000T0000Z-110713T0045Z/ GOSHEN WY-LARAMIE WY-PLATTE WY- 627 PM MDT TUE JUL 12 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHEASTERN PLATTE... NORTH CENTRAL LARAMIE AND SOUTHWESTERN GOSHEN COUNTIES UNTIL 645 PM MDT... AT 623 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED 7 MILES SOUTH OF CHUGWATER...OR 28 MILES SOUTH OF WHEATLAND...MOVING NORTHEAST AT 30 MPH. LOCATIONS IMPACTED INCLUDE... CHUGWATER...I-25 EXIT 54 AND I-25 EXIT 65. PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS. TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN CHEYENNE. && LAT...LON 4167 10508 4194 10499 4170 10440 4157 10473 TIME...MOT...LOC 0026Z 206DEG 26KT 4168 10485 $$ CLAYCOMB
201 WWUS55 KCYS 130033 SVSCYS SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 633 PM MDT TUE JUL 12 2011 WYC015-021-031-130044- /O.CAN.KCYS.TO.W.0027.000000T0000Z-110713T0045Z/ GOSHEN WY-LARAMIE WY-PLATTE WY- 633 PM MDT TUE JUL 12 2011 ...THE TORNADO WARNING FOR SOUTHEASTERN PLATTE...NORTH CENTRAL LARAMIE AND SOUTHWESTERN GOSHEN COUNTIES IS CANCELLED... THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY. TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN CHEYENNE. LAT...LON 4167 10508 4194 10499 4170 10440 4157 10473 TIME...MOT...LOC 0034Z 206DEG 26KT 4173 10482 $$ CLAYCOMB
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 12, 6:03 PM MDT | Tornado Warning | CYS | Laramie | 27 min |
| Jul 12, 6:56 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 45 min |
| Jul 12, 7:09 PM MDT | Flash Flood Warning | CYS | Goshen, Laramie | 8 hr |
| Jul 12, 7:46 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 32 min |
| Jul 12, 10:26 PM MDT | Flash Flood Warning | CYS | Goshen, Laramie, Platte | 4 hr |
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.