Alert archive / Wyoming / Tornado Warnings in 2011
Tornado Warning 5, NWS Riverton, WY
NWS Riverton, WY issued this tornado warning at Jun 12, 2011, 3:28 PM MDT for Washakie County, Wyoming. It was in force for 32 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
- Jun 12, 2011, 3:28 PM MDT (21:28 UTC)
- Expired
- Jun 12, 2011, 4:00 PM MDT
- In force
- 32 min
- Issued by
- NWS Riverton, WY
- Area
- Storm-based polygon
County Washakie County, WY
The radar
The Riverton/Lander radar (KRIW), 114 km from the middle of the area, began a volume at 21:30 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, 4:07 PM MDT | HAIL 1 | 17 S Ten Sleep, WY |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Riverton, WY (KRIW), launched 12:00Z, 9.5 hours before the alert went out and 111 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
- 8 J/kg
- Mixed-layer CIN
- -204 J/kg
- Mixed-layer LCL
- 1656 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 82 m²/s²
- 0-3 km storm-relative helicity
- 230 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
936 WFUS55 KRIW 122128 TORRIW WYC043-122200- /O.NEW.KRIW.TO.W.0005.110612T2128Z-110612T2200Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE RIVERTON WY 328 PM MDT SUN JUN 12 2011 THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A * TORNADO WARNING FOR... CENTRAL WASHAKIE COUNTY IN NORTH CENTRAL WYOMING... * UNTIL 400 PM MDT * AT 325 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED 9 MILES NORTHEAST OF STATE HWY 172 MILE MARKER 10...OR 13 MILES SOUTH OF WORLAND...AND MOVING EAST AT 25 MPH. * THIS DANGEROUS STORM WILL AFFECT MAINLY RURAL AREAS OF CENTRAL WASHAKIE COUNTY. 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. && REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4406 10751 4377 10740 4374 10792 4391 10797 TIME...MOT...LOC 2128Z 258DEG 23KT 4383 10783 $$ MEUNIER
2 follow-up statements
549 WWUS55 KRIW 122142 SVSRIW SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 342 PM MDT SUN JUN 12 2011 WYC043-122200- /O.CON.KRIW.TO.W.0005.000000T0000Z-110612T2200Z/ WASHAKIE WY- 342 PM MDT SUN JUN 12 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR CENTRAL WASHAKIE COUNTY UNTIL 400 PM MDT... AT 339 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED 13 MILES SOUTH OF U.S. HWY 16 MILE MARKER 20...OR 16 MILES SOUTHWEST OF TEN SLEEP...MOVING EAST AT 35 MPH. LOCATIONS IMPACTED INCLUDE... U.S. HWY 16 MILE MARKER 20. PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS. && REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4406 10751 4377 10740 4374 10792 4391 10797 TIME...MOT...LOC 2142Z 255DEG 30KT 4386 10761 $$ MEUNIER
101 WWUS55 KRIW 122155 SVSRIW SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 355 PM MDT SUN JUN 12 2011 WYC043-122205- /O.EXP.KRIW.TO.W.0005.000000T0000Z-110612T2200Z/ WASHAKIE WY- 355 PM MDT SUN JUN 12 2011 ...THE TORNADO WARNING FOR CENTRAL WASHAKIE COUNTY WILL EXPIRE AT 400 PM MDT... THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED OUT OF THE WARNED AREA. HOWEVER SMALL HAIL AND HEAVY RAIN ARE STILL POSSIBLE WITH THIS THUNDERSTORM. REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4406 10751 4377 10740 4374 10792 4391 10797 TIME...MOT...LOC 2155Z 255DEG 30KT 4389 10746 $$ MEUNIER
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 12, 11:27 AM MDT | Areal Flood Advisory | RIW | Fremont, Hot Springs, Lincoln, Park, Sublette, Teton | 15 hr |
| Jun 12, 12:36 PM MDT | Special Weather Statement | RIW | Sublette | 39 min |
| Jun 12, 1:58 PM MDT | Special Weather Statement | RIW | Johnson | 62 min |
| Jun 12, 2:21 PM MDT | Special Weather Statement | RIW | Fremont | 39 min |
| Jun 12, 2:40 PM MDT | Special Weather Statement | RIW | Washakie | 50 min |
| Jun 12, 4:16 PM MDT | Special Weather Statement | RIW | Johnson | 44 min |
| Jun 12, 4:57 PM MDT | Special Weather Statement | RIW | Johnson | 33 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.