Alert archive / Wyoming / Tornado Warnings in 2018
Tornado Warning 4, NWS Riverton, WY
NWS Riverton, WY issued this tornado warning at May 27, 2018, 2:13 PM MDT for Fremont County, Sweetwater County, Wyoming. It was in force for 47 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
- May 27, 2018, 2:13 PM MDT (20:13 UTC)
- Expired
- May 27, 2018, 3:00 PM MDT
- In force
- 47 min
- Issued by
- NWS Riverton, WY
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 1.5 in
Counties Fremont County, WY, Sweetwater County, WY
The radar
The Riverton/Lander radar (KRIW), 113 km from the middle of the area, began a volume at 20:16 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 27, 12:05 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
The nearest sounding before it
Riverton, WY (KRIW), launched 12:00Z, 8.2 hours before the alert went out and 110 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
- 52 J/kg
- Mixed-layer CIN
- -196 J/kg
- Mixed-layer LCL
- 1809 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 145 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
474
WFUS55 KRIW 272013
TORRIW
WYC013-037-272100-
/O.NEW.KRIW.TO.W.0004.180527T2013Z-180527T2100Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Riverton WY
213 PM MDT SUN MAY 27 2018
The National Weather Service in Riverton has issued a
* Tornado Warning for...
Southeastern Fremont County in central Wyoming...
Northeastern Sweetwater County in south central Wyoming...
* Until 300 PM MDT
* At 212 PM MDT, a severe thunderstorm capable of producing a tornado
was located 13 miles southwest of Bairoil, which is 21 miles south
of Jeffrey City, moving north at 15 mph.
HAZARD...Tornado and ping pong ball size hail.
SOURCE...Radar indicated rotation.
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 dangerous storm will be near...
Crooks Gap around 300 PM MDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
&&
LAT...LON 4208 10761 4208 10793 4240 10799 4240 10758
TIME...MOT...LOC 2012Z 177DEG 15KT 4216 10780
TORNADO...RADAR INDICATED
HAIL...1.50IN
$$
Jones2 follow-up statements
385
WWUS55 KRIW 272041
SVSRIW
Severe Weather Statement
National Weather Service Riverton WY
241 PM MDT SUN MAY 27 2018
WYC013-037-272100-
/O.CON.KRIW.TO.W.0004.000000T0000Z-180527T2100Z/
Fremont-Sweetwater-
241 PM MDT SUN MAY 27 2018
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 300 PM MDT FOR
SOUTHEASTERN FREMONT AND NORTHEASTERN SWEETWATER COUNTIES...
At 239 PM MDT, a severe thunderstorm capable of producing a tornado
was located near Crooks Gap, which is 14 miles south of Jeffrey City,
moving northwest at 20 mph.
HAZARD...Tornado and ping pong ball size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This dangerous storm will be near...
Crooks Gap around 255 PM MDT.
Additional thunderstorms are developing north of this thunderstorm.
These new storms may also pose a tornado threat Sunday afternoon.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4215 10761 4215 10794 4240 10799 4240 10758
TIME...MOT...LOC 2039Z 155DEG 17KT 4228 10788
TORNADO...RADAR INDICATED
HAIL...1.50IN
$$
CNJ578
WWUS55 KRIW 272057
SVSRIW
Severe Weather Statement
National Weather Service Riverton WY
257 PM MDT SUN MAY 27 2018
WYC013-037-272105-
/O.EXP.KRIW.TO.W.0004.000000T0000Z-180527T2100Z/
Fremont-Sweetwater-
257 PM MDT SUN MAY 27 2018
...THE TORNADO WARNING FOR SOUTHEASTERN FREMONT AND NORTHEASTERN
SWEETWATER COUNTIES WILL EXPIRE AT 300 PM MDT...
The storm which prompted the warning has weakened and is no longer
appears capable of producing a tornado. Therefore the warning will
be allowed to expire at 300 PM.
However, one-quarter to one-half inch diameter hail and very heavy
rain are still likely with any thunderstorms this afternoon.
A severe thunderstorm watch remains in effect until 800 PM MDT for
central Wyoming.
LAT...LON 4215 10761 4215 10794 4240 10799 4240 10758
TIME...MOT...LOC 2055Z 177DEG 15KT 4233 10788
$$
CNJThe office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 26, 6:49 PM MDT | Special Weather Statement | RIW | Park | 41 min |
| May 26, 11:00 PM MDT | Areal Flood Warning | RIW | Big Horn | 12 hr |
| May 26, 11:21 PM MDT | Areal Flood Warning | RIW | Washakie | 12 hr |
| May 27, 1:46 AM MDT | Flash Flood Watch | RIW | Johnson, Natrona | 25 hr |
| May 27, 9:40 AM MDT | Areal Flood Warning | RIW | Fremont | 47 hr |
| May 27, 10:24 AM MDT | Special Weather Statement | RIW | Fremont | 36 min |
| May 27, 11:03 AM MDT | Special Weather Statement | RIW | Fremont | 42 min |
| May 27, 11:19 AM MDT | Flash Flood Warning | RIW | Fremont | 3 hr |
| May 27, 11:42 AM MDT | Special Weather Statement | RIW | 33 min | |
| May 27, 11:50 AM MDT | Special Weather Statement | RIW | 40 min | |
| May 27, 11:58 AM MDT | Special Weather Statement | RIW | Fremont | 47 min |
| May 27, 12:01 PM MDT | Flash Flood Warning | RIW | Fremont | 3 hr |
| May 27, 12:15 PM MDT | Special Weather Statement | RIW | 45 min | |
| May 27, 12:18 PM MDT | Tornado Warning | RIW | Fremont | 27 min |
| May 27, 12:39 PM MDT | Special Weather Statement | RIW | 51 min | |
| May 27, 12:45 PM MDT | Tornado Warning | RIW | Fremont | 30 min |
| May 27, 12:52 PM MDT | Severe Thunderstorm Warning | RIW | Fremont | 38 min |
| May 27, 12:54 PM MDT | Flash Flood Warning | RIW | Sweetwater | 3 hr |
| May 27, 1:01 PM MDT | Flash Flood Warning | RIW | Fremont | 3 hr |
| May 27, 1:07 PM MDT | Special Weather Statement | RIW | Fremont | 38 min |
| May 27, 1:13 PM MDT | Severe Thunderstorm Warning | RIW | Fremont | 62 min |
| May 27, 1:25 PM MDT | Special Weather Statement | RIW | 50 min | |
| May 27, 1:27 PM MDT | Severe Thunderstorm Warning | RIW | Sweetwater | 63 min |
| May 27, 1:38 PM MDT | Tornado Warning | RIW | Sweetwater | 37 min |
| May 27, 2:03 PM MDT | Special Weather Statement | RIW | Fremont | 42 min |
| May 27, 2:12 PM MDT | Special Weather Statement | RIW | 33 min | |
| May 27, 2:14 PM MDT | Special Weather Statement | RIW | Teton | 46 min |
| May 27, 2:24 PM MDT | Severe Thunderstorm Warning | RIW | Natrona | 51 min |
| May 27, 2:52 PM MDT | Special Weather Statement | RIW | Fremont | 38 min |
| May 27, 3:05 PM MDT | Special Weather Statement | RIW | 40 min | |
| May 27, 3:13 PM MDT | Special Weather Statement | RIW | Natrona | 47 min |
| May 27, 3:22 PM MDT | Special Weather Statement | RIW | Hot Springs | 53 min |
| May 27, 3:42 PM MDT | Severe Thunderstorm Warning | RIW | Natrona | 48 min |
| May 27, 3:44 PM MDT | Severe Thunderstorm Warning | RIW | Natrona | 46 min |
| May 27, 4:13 PM MDT | Tornado Warning | RIW | Natrona | 32 min |
| May 27, 4:18 PM MDT | Special Weather Statement | RIW | Hot Springs | 42 min |
| May 27, 4:29 PM MDT | Severe Thunderstorm Warning | RIW | Natrona | 46 min |
| May 27, 4:38 PM MDT | Severe Thunderstorm Warning | RIW | Big Horn, Hot Springs, Park, Washakie | 37 min |
| May 27, 4:46 PM MDT | Areal Flood Advisory | RIW | Natrona | 119 min |
| May 27, 5:21 PM MDT | Special Weather Statement | RIW | Big Horn | 39 min |
| May 27, 5:43 PM MDT | Severe Thunderstorm Warning | RIW | Big Horn, Park | 47 min |
Nearby
Tornado Warnings in Wyoming, 2018Every tornado warning in 2018Tornadoes in 2018
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.