Alert archive / Wyoming / Tornado Warnings in 2011
Tornado Warning 2, NWS Riverton, WY
NWS Riverton, WY issued this tornado warning at Jun 8, 2011, 6:39 PM MDT for Natrona County, Wyoming. It was in force for 36 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 8, 2011, 6:39 PM MDT (00:39 UTC)
- Expired
- Jun 8, 2011, 7:15 PM MDT
- In force
- 36 min
- Issued by
- NWS Riverton, WY
- Area
- Storm-based polygon
County Natrona County, WY
The radar
The Riverton/Lander radar (KRIW), 146 km from the middle of the area, began a volume at 00:40 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 8, 7:25 PM MDT | FUNNEL CLOUD | 15 W Casper, WY | TWO REPORTS OF FUNNEL CLOUDS APPROXIMATELY 15 MILES WEST OF CASPER. REPORTED BY NATRONA COUNTY DISPATCH. |
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 00:00Z, 0.7 hours before the alert went out and 140 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
- 78 J/kg
- Mixed-layer CIN
- -112 J/kg
- Mixed-layer LCL
- 1730 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 89 m²/s²
- 0-3 km storm-relative helicity
- 234 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
112 WFUS55 KRIW 090039 TORRIW WYC025-090115- /O.NEW.KRIW.TO.W.0002.110609T0039Z-110609T0115Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE RIVERTON WY 639 PM MDT WED JUN 8 2011 THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A * TORNADO WARNING FOR... CENTRAL NATRONA COUNTY IN CENTRAL WYOMING... * UNTIL 715 PM MDT * AT 636 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED 12 MILES SOUTH OF POWDER RIVER...OR 29 MILES WEST OF CASPER...AND MOVING EAST AT 30 MPH. * THIS DANGEROUS STORM WILL BE NEAR... U.S. HWY 20/26 MILE MARKER 20 AROUND 705 PM MDT. EMIGRANT GAP AROUND 710 PM MDT. OTHER LOCATIONS IMPACTED BY THIS DANGEROUS STORM INCLUDE U.S. HWY 20/26 BETWEEN MILEPOSTS 10 AND 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 4308 10651 4278 10642 4275 10700 4297 10703 TIME...MOT...LOC 0039Z 258DEG 27KT 4287 10687 $$ JONES
1 follow-up statement
495 WWUS55 KRIW 090051 SVSRIW SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 651 PM MDT WED JUN 8 2011 WYC025-090115- /O.CON.KRIW.TO.W.0002.000000T0000Z-110609T0115Z/ NATRONA WY- 651 PM MDT WED JUN 8 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR CENTRAL NATRONA COUNTY UNTIL 715 PM MDT... AT 650 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED 8 MILES SOUTHWEST OF U.S. HWY 20/26 MILE MARKER 20...OR 23 MILES WEST OF CASPER...MOVING EAST AT 30 MPH. THIS DANGEROUS STORM WILL BE NEAR... U.S. HWY 20/26 MILE MARKER 20 AROUND 700 PM MDT. EMIGRANT GAP AROUND 710 PM MDT. OTHER LOCATIONS IMPACTED BY THIS DANGEROUS STORM INCLUDE U.S. HWY 20/26 BETWEEN MILEPOSTS 10 AND 20. PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS. && REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4277 10687 4299 10691 4308 10651 4278 10642 TIME...MOT...LOC 0051Z 258DEG 27KT 4290 10674 $$ JONES
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 8, 6:25 PM MDT | Severe Thunderstorm Warning | RIW | Natrona | 65 min |
| Jun 8, 6:54 PM MDT | Special Weather Statement | RIW | 51 min | |
| Jun 8, 7:15 PM MDT | Tornado Warning | RIW | Natrona | 30 min |
| Jun 8, 7:33 PM MDT | Special Weather Statement | RIW | Fremont | 27 min |
| Jun 8, 7:42 PM MDT | Severe Thunderstorm Warning | RIW | Natrona | 33 min |
| Jun 8, 7:46 PM MDT | Tornado Warning | RIW | Natrona | 29 min |
| Jun 8, 8:02 PM MDT | Special Weather Statement | RIW | Fremont | 43 min |
| Jun 8, 8:47 PM MDT | Special Weather Statement | RIW | Fremont | 43 min |
| Jun 8, 10:21 PM MDT | Special Weather Statement | RIW | 39 min | |
| Jun 8, 10:31 PM MDT | Severe Thunderstorm Warning | RIW | Natrona | 29 min |
| Jun 9, 12:19 AM MDT | Special Weather Statement | RIW | Johnson | 26 min |
| Jun 9, 1:02 PM MDT | Special Weather Statement | RIW | Fremont | 43 min |
| Jun 9, 1:40 PM MDT | Special Weather Statement | RIW | Fremont | 50 min |
| Jun 9, 2:06 PM MDT | Special Weather Statement | RIW | Hot Springs | 39 min |
| Jun 9, 2:32 PM MDT | Special Weather Statement | RIW | Washakie | 43 min |
| Jun 9, 2:56 PM MDT | Special Weather Statement | RIW | Washakie | 49 min |
| Jun 9, 3:07 PM MDT | Flash Flood Warning | RIW | Hot Springs, Washakie | 113 min |
| Jun 9, 5:17 PM MDT | Areal Flood Advisory | RIW | Hot Springs, Washakie | 19 hr |
| Jun 9, 5:43 PM MDT | Special Weather Statement | RIW | Fremont | 47 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.