Alert archive / Wyoming / Tornado Warnings in 2018
Tornado Warning 2, NWS Riverton, WY
NWS Riverton, WY issued this tornado warning at May 27, 2018, 12:45 PM MDT for Fremont County, Wyoming. It was in force for 30 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, 12:45 PM MDT (18:45 UTC)
- Expired
- May 27, 2018, 1:15 PM MDT
- In force
- 30 min
- Issued by
- NWS Riverton, WY
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 1.25 in
County Fremont County, WY
The radar
The Riverton/Lander radar (KRIW), 66 km from the middle of the area, began a volume at 18:45 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, 6.8 hours before the alert went out and 68 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.
444
WFUS55 KRIW 271845
TORRIW
WYC013-271915-
/O.NEW.KRIW.TO.W.0002.180527T1845Z-180527T1915Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Riverton WY
1245 PM MDT SUN MAY 27 2018
The National Weather Service in Riverton has issued a
* Tornado Warning for...
South central Fremont County in central Wyoming...
* Until 115 PM MDT
* At 1245 PM MDT, a severe thunderstorm capable of producing a
tornado was located near South Pass City, which is 26 miles south
of Lander, moving north at 15 mph.
HAZARD...Tornado and half dollar 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...
South Pass City and Atlantic City around 1255 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 4243 10853 4236 10879 4258 10892 4265 10858
TIME...MOT...LOC 1845Z 161DEG 13KT 4245 10874
TORNADO...RADAR INDICATED
HAIL...1.25IN
$$
Jones2 follow-up statements
851
WWUS55 KRIW 271857
SVSRIW
Severe Weather Statement
National Weather Service Riverton WY
1257 PM MDT SUN MAY 27 2018
WYC013-271915-
/O.CON.KRIW.TO.W.0002.000000T0000Z-180527T1915Z/
Fremont-
1257 PM MDT SUN MAY 27 2018
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 115 PM MDT FOR SOUTH
CENTRAL FREMONT COUNTY...
At 1256 PM MDT, a severe thunderstorm capable of producing a tornado
was located over South Pass City, which is 23 miles south of Lander,
moving north at 10 to 15 mph.
HAZARD...Tornado and half dollar size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This dangerous storm will cross State Highway 28 near the old US
Steel mine.
Other locations impacted by this tornadic thunderstorm include
Atlantic City and South Pass City.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4246 10854 4243 10882 4258 10892 4265 10858
TIME...MOT...LOC 1856Z 161DEG 13KT 4249 10876
TORNADO...RADAR INDICATED
HAIL...1.25IN
$$
CNJ901
WWUS55 KRIW 271909
SVSRIW
Severe Weather Statement
National Weather Service Riverton WY
109 PM MDT SUN MAY 27 2018
WYC013-271918-
/O.EXP.KRIW.TO.W.0002.000000T0000Z-180527T1915Z/
Fremont-
109 PM MDT SUN MAY 27 2018
...THE TORNADO WARNING FOR SOUTH CENTRAL FREMONT COUNTY WILL EXPIRE
AT 115 PM MDT...
The storm which prompted the warning has weakened and no longer
appears capable of producing a tornado. Therefore the tornado
warning will be allowed to expire.
However, heavy rain is still possible with thunderstorms across
Fremont County this afternoon
A severe thunderstorm watch remains in effect until 800 PM MDT for
central Wyoming.
LAT...LON 4246 10854 4243 10882 4258 10892 4265 10858
TIME...MOT...LOC 1908Z 161DEG 13KT 4253 10878
$$
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, 12:52 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, 2:13 PM MDT | Tornado Warning | RIW | Fremont, Sweetwater | 47 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.