Alert archive / Wyoming / Tornado Warnings in 2011
Tornado Warning 3, NWS Riverton, WY
NWS Riverton, WY issued this tornado warning at Jun 8, 2011, 7:15 PM MDT for Natrona County, Wyoming. It was in force for 30 min. 2 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 8, 2011, 7:15 PM MDT (01:15 UTC)
- Expired
- Jun 8, 2011, 7:45 PM MDT
- In force
- 30 min
- Issued by
- NWS Riverton, WY
- Area
- Storm-based polygon
County Natrona County, WY
The radar
The Riverton/Lander radar (KRIW), 176 km from the middle of the area, began a volume at 01:18 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, 7:37 PM MDT | HAIL 1.25 | Natrona County Airport, WY | REPORTED BY TV METEOROLOGIST NEAR THE CASPER-NATRONA COUNTY INTERNATIONAL AIRPORT. |
| Jun 8, 7:45 PM MDT | HAIL 2 | 4 N Bar Nunn, WY | TRAINED SPOTTER AND OFF-DUTY NWS METEOROLOGIST EACH REPORTED 2 INCH DIAMETER HAIL NEAR MILEPOST 195 ON INTERSTATE 25. |
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, 1.3 hours before the alert went out and 170 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.
787 WFUS55 KRIW 090115 TORRIW WYC025-090145- /O.NEW.KRIW.TO.W.0003.110609T0115Z-110609T0145Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE RIVERTON WY 715 PM MDT WED JUN 8 2011 THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A * TORNADO WARNING FOR... EAST CENTRAL NATRONA COUNTY IN CENTRAL WYOMING... * UNTIL 745 PM MDT * AT 714 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED NEAR NATRONA COUNTY AIRPORT...OR 12 MILES NORTHWEST OF CASPER...AND MOVING EAST AT 30 MPH. A FUNNEL CLOUD AND ROTATION HAS BEEN NOTED WITH THIS STORM. * THIS DANGEROUS STORM WILL BE NEAR... NATRONA COUNTY AIRPORT AROUND 720 PM MDT. BAR NUNN...HOMA HILLS AROUND 730 PM MDT. I25 EXIT 197 AND I25 MILE MARKER 200 AROUND 735 PM MDT. EVANSVILLE AROUND 740 PM MDT. OTHER LOCATIONS IMPACTED BY THIS DANGEROUS STORM INCLUDE U.S. HWY 20/26 MILE MARKER 10 AND CASPER EVENTS CENTER. THIS INCLUDES INTERSTATE 25 IN WYOMING BETWEEN MILE MARKERS 189 AND 202. 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 4310 10608 4287 10608 4284 10664 4299 10668 TIME...MOT...LOC 0115Z 258DEG 28KT 4292 10653 $$ JONES
2 follow-up statements
237 WWUS55 KRIW 090125 SVSRIW SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 725 PM MDT WED JUN 8 2011 WYC025-090145- /O.CON.KRIW.TO.W.0003.000000T0000Z-110609T0145Z/ NATRONA WY- 725 PM MDT WED JUN 8 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR EAST CENTRAL NATRONA COUNTY UNTIL 745 PM MDT... AT 722 PM MDT...TRAINED WEATHER SPOTTERS REPORTED A FUNNEL CLOUD AND ROTATION IN ASSOCIATION WITH THE WARNED THUNDERSTORM. THE STORM WAS LOCATED NEAR CASPER-NATRONA COUNTY INTERNATIONAL AIRPORT...MOVING EAST AT 30 MPH. IN ADDITION...HAIL OF ONE-HALF TO ONE INCH IN DIAMETER WAS REPORTED ON HIGHWAY 20/26 WEST OF THE CASPER AIRPORT. THE TORNADO WILL BE NEAR... BAR NUNN AND HOMA HILLS AROUND 730 PM MDT. OTHER LOCATIONS IMPACTED BY THE TORNADO INCLUDE INTERSTATE 25 BETWEEN MILEPOSTS 191 AND 210. PRECAUTIONARY/PREPAREDNESS ACTIONS... TO REPEAT...A TORNADO IS ON THE GROUND. TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS. && REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4285 10655 4300 10658 4310 10608 4287 10608 TIME...MOT...LOC 0122Z 258DEG 28KT 4293 10646 $$ JONES
489 WWUS55 KRIW 090135 SVSRIW SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 735 PM MDT WED JUN 8 2011 WYC025-090145- /O.CON.KRIW.TO.W.0003.000000T0000Z-110609T0145Z/ NATRONA WY- 735 PM MDT WED JUN 8 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR EAST CENTRAL NATRONA COUNTY UNTIL 745 PM MDT... AT 731 PM MDT...TRAINED WEATHER SPOTTERS REPORTED A FUNNEL CLOUD. A TORNADO MAY DEVELOP AT ANY TIME. THIS DANGEROUS STORM WAS LOCATED NEAR HOMA HILLS...OR 9 MILES NORTH OF CASPER...MOVING EAST AT 30 MPH. HAIL OF ONE INCH IN DIAMETER HAS ALSO BEEN REPORTED WITH THIS STORM. THIS DANGEROUS STORM WILL BE NEAR... HOMA HILLS AND INTERSTATE 25 MILEPOST 195 UNTIL 745 PM MDT. 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 4288 10643 4302 10649 4310 10608 4291 10608 TIME...MOT...LOC 0133Z 252DEG 25KT 4296 10637 $$ 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, 6:39 PM MDT | Tornado Warning | RIW | Natrona | 36 min |
| Jun 8, 6:54 PM MDT | Special Weather Statement | RIW | 51 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.