Alert archive / Wyoming / Tornado Warnings in 2017
Tornado Warning 8, NWS Riverton, WY
NWS Riverton, WY issued this tornado warning at Jun 12, 2017, 6:19 PM MDT for Big Horn County, Washakie County, Wyoming. It was in force for 26 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, 2017, 6:19 PM MDT (00:19 UTC)
- Expired
- Jun 12, 2017, 6:45 PM MDT
- In force
- 26 min
- Issued by
- NWS Riverton, WY
- Area
- Storm-based polygon
- Tornado
- Observed
- Hail
- 1.5 in
Counties Big Horn County, WY, Washakie County, WY
The radar
The Riverton/Lander radar (KRIW), 147 km from the middle of the area, began a volume at 00:22 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, 6:21 PM MDT | TORNADO | 4 W Burlington, WY | PHOTO RECEIVED OF ROPE TORNADO WEST OF BURLINGTON |
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 |
|---|---|---|---|
| Jun 12, 2:45 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Riverton, WY (KRIW), launched 00:00Z, 0.3 hours before the alert went out and 147 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
- 804 J/kg
- Mixed-layer CIN
- -131 J/kg
- Mixed-layer LCL
- 2386 m above ground
- 0-6 km bulk shear
- 65 kt
- 0-1 km storm-relative helicity
- -26 m²/s²
- 0-3 km storm-relative helicity
- 76 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
The text
As transmitted.
163
WFUS55 KRIW 130019
TORRIW
WYC003-043-130045-
/O.NEW.KRIW.TO.W.0008.170613T0019Z-170613T0045Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Riverton WY
619 PM MDT MON JUN 12 2017
The National Weather Service in Riverton has issued a
* Tornado Warning for...
Southwestern Big Horn County in central Wyoming...
Northwestern Washakie County in central Wyoming...
* Until 645 PM MDT
* At 618 PM MDT, a confirmed tornado was located 14 miles southwest
of Otto, which is 21 miles east of Meeteetse, moving north at 45
mph.
HAZARD...Damaging tornado and ping pong ball size hail.
SOURCE...Weather spotters confirmed tornado.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* The tornado will be near...
Otto around 635 PM MDT.
Other locations impacted by this tornadic thunderstorm include Rocky
Mountain High School, Emblem and Burlington.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Riverton.
&&
LAT...LON 4476 10814 4413 10833 4415 10855 4417 10855
4417 10857 4419 10858 4480 10852
TIME...MOT...LOC 0018Z 187DEG 38KT 4423 10844
TORNADO...OBSERVED
HAIL...1.50IN
$$
TL2 follow-up statements
791
WWUS55 KRIW 130032
SVSRIW
Severe Weather Statement
National Weather Service Riverton WY
632 PM MDT MON JUN 12 2017
WYC043-130040-
/O.CAN.KRIW.TO.W.0008.000000T0000Z-170613T0045Z/
Washakie-
632 PM MDT MON JUN 12 2017
...THE TORNADO WARNING FOR NORTHWESTERN WASHAKIE COUNTY IS
CANCELLED...
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled.
A severe thunderstorm watch remains in effect until 1000 PM MDT for
central Wyoming.
LAT...LON 4427 10830 4429 10855 4445 10855 4462 10854
4459 10819 4444 10824
TIME...MOT...LOC 0030Z 187DEG 38KT 4436 10842
$$
WYC003-130045-
/O.CON.KRIW.TO.W.0008.000000T0000Z-170613T0045Z/
Big Horn-
632 PM MDT MON JUN 12 2017
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 645 PM MDT FOR
SOUTHWESTERN BIG HORN COUNTY...
At 630 PM MDT, a confirmed tornado was located 7 miles west of Otto,
which is 18 miles west of Basin, moving north at 45 mph.
HAZARD...Damaging tornado and ping pong ball size hail.
SOURCE...Weather spotters confirmed tornado.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This tornado will be near...
Otto around 635 PM MDT.
Other locations impacted by this tornadic thunderstorm include Emblem
and Burlington.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.
If a tornado or other severe weather is spotted, report it to the
National Weather Service or your local nearest law enforcement agency
who will send your report. This act may save lives of others in the
path of dangerous weather.
&&
LAT...LON 4427 10830 4429 10855 4445 10855 4462 10854
4459 10819 4444 10824
TIME...MOT...LOC 0030Z 187DEG 38KT 4436 10842
TORNADO...OBSERVED
HAIL...1.50IN
$$
TL117
WWUS55 KRIW 130042
SVSRIW
Severe Weather Statement
National Weather Service Riverton WY
642 PM MDT MON JUN 12 2017
WYC003-130052-
/O.EXP.KRIW.TO.W.0008.000000T0000Z-170613T0045Z/
Big Horn-
642 PM MDT MON JUN 12 2017
...THE TORNADO WARNING FOR SOUTHWESTERN BIG HORN COUNTY WILL EXPIRE
AT 645 PM MDT...
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore the warning will be allowed to expire.
A severe thunderstorm watch remains in effect until 1000 PM MDT for
central Wyoming.
LAT...LON 4427 10830 4429 10855 4445 10855 4462 10854
4459 10819 4444 10824
TIME...MOT...LOC 0042Z 187DEG 38KT 4447 10840
$$
TLThe office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 12, 6:00 PM MDT | Tornado Warning | RIW | Johnson | 30 min |
| Jun 12, 6:02 PM MDT | Severe Thunderstorm Warning | RIW | Big Horn, Park | 19 min |
| Jun 12, 6:18 PM MDT | Severe Thunderstorm Warning | RIW | Natrona | 26 min |
| Jun 12, 6:19 PM MDT | Severe Thunderstorm Warning | RIW | Park | 15 min |
| Jun 12, 6:20 PM MDT | Special Weather Statement | RIW | Washakie | 25 min |
| Jun 12, 6:24 PM MDT | Special Weather Statement | RIW | Natrona | 36 min |
| Jun 12, 6:32 PM MDT | Tornado Warning | RIW | Johnson | 28 min |
| Jun 12, 6:35 PM MDT | Special Weather Statement | RIW | Natrona | 25 min |
| Jun 12, 6:36 PM MDT | Special Weather Statement | RIW | 24 min | |
| Jun 12, 6:40 PM MDT | Tornado Warning | RIW | Natrona | 35 min |
| Jun 12, 6:42 PM MDT | Special Weather Statement | RIW | Natrona | 33 min |
| Jun 12, 6:45 PM MDT | Special Weather Statement | RIW | Johnson | 30 min |
| Jun 12, 6:51 PM MDT | Special Weather Statement | RIW | Washakie | 24 min |
| Jun 12, 6:56 PM MDT | Severe Thunderstorm Warning | RIW | Big Horn, Johnson, Washakie | 34 min |
| Jun 12, 7:02 PM MDT | Severe Thunderstorm Warning | RIW | Johnson | 43 min |
| Jun 12, 7:07 PM MDT | Severe Thunderstorm Warning | RIW | Johnson, Natrona | 53 min |
| Jun 12, 7:12 PM MDT | Special Weather Statement | RIW | Johnson | 33 min |
| Jun 12, 7:16 PM MDT | Areal Flood Advisory | RIW | Johnson | 4 hr |
| Jun 12, 7:18 PM MDT | Severe Thunderstorm Warning | RIW | Johnson, Natrona | 27 min |
| Jun 12, 7:34 PM MDT | Severe Thunderstorm Warning | RIW | Big Horn, Johnson, Washakie | 19 min |
| Jun 12, 7:44 PM MDT | Severe Thunderstorm Warning | RIW | Johnson | 46 min |
| Jun 12, 7:46 PM MDT | Special Weather Statement | RIW | 29 min | |
| Jun 12, 7:49 PM MDT | Special Weather Statement | RIW | 26 min | |
| Jun 12, 8:02 PM MDT | Special Weather Statement | RIW | Johnson | 28 min |
| Jun 12, 8:03 PM MDT | Special Weather Statement | RIW | Johnson | 27 min |
| Jun 12, 8:13 PM MDT | Special Weather Statement | RIW | Big Horn | 32 min |
| Jun 12, 8:18 PM MDT | Special Weather Statement | RIW | Park | 27 min |
| Jun 12, 8:21 PM MDT | Special Weather Statement | RIW | Big Horn | 24 min |
| Jun 12, 8:31 PM MDT | Special Weather Statement | RIW | Johnson | 29 min |
| Jun 12, 8:45 PM MDT | Special Weather Statement | RIW | 45 min | |
| Jun 12, 8:47 PM MDT | Flash Flood Warning | RIW | Johnson | 4 hr |
| Jun 12, 8:52 PM MDT | Flash Flood Warning | RIW | Johnson | 4 hr |
| Jun 12, 8:57 PM MDT | Special Weather Statement | RIW | Johnson | 33 min |
| Jun 12, 9:27 PM MDT | Special Weather Statement | RIW | Johnson | 33 min |
| Jun 12, 10:56 PM MDT | High Wind Warning | RIW | Fremont, Natrona, Sweetwater | 22 hr |
| Jun 13, 12:22 AM MDT | Flash Flood Warning | RIW | Johnson | 4 hr |
Nearby
Tornado Warnings in Wyoming, 2017Every tornado warning in 2017Tornadoes in 2017
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.