Alert archive / Wyoming / Tornado Warnings in 2018

Tornado Warning 9, NWS Riverton, WY

June 8, 2018Hot Springs County, Washakie County, Wyoming

NWS Riverton, WY issued this tornado warning at Jun 8, 2018, 2:37 PM MDT for Hot Springs County, Washakie County, Wyoming. It was in force for 23 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: Jun 8, 2018, 2:37 PM MDT (20:37 UTC)
Expired: Jun 8, 2018, 3:00 PM MDT
In force: 23 min
Issued by: NWS Riverton, WY
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Hot Springs County, WY, Washakie County, WY

The radar

The Riverton/Lander radar (KRIW), 100 km from the middle of the area, began a volume at 20:39 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 nearest sounding before it

Riverton, WY (KRIW), launched 12:00Z, 8.6 hours before the alert went out and 99 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 60 J/kg
Mixed-layer CIN: -336 J/kg
Mixed-layer LCL: 1894 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: -48 m²/s²
0-3 km storm-relative helicity: -55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

598 
WFUS55 KRIW 082037
TORRIW
WYC017-043-082100-
/O.NEW.KRIW.TO.W.0009.180608T2037Z-180608T2100Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Riverton WY
237 PM MDT FRI JUN 8 2018

The National Weather Service in Riverton has issued a

* Tornado Warning for...
  North central Hot Springs County in central Wyoming...
  Northwestern Washakie County in central Wyoming...

* Until 300 PM MDT.
    
* At 236 PM MDT, a severe thunderstorm capable of producing a tornado
  was located 11 miles northwest of Winchester, or 19 miles west of
  Worland, moving northeast at 20 mph.

  HAZARD...Tornado.

  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 tornadic thunderstorm will remain over mainly rural areas of
  north central Hot Springs and northwestern Washakie Counties.

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 4385 10836 4399 10850 4413 10818 4396 10804
TIME...MOT...LOC 2036Z 239DEG 16KT 4395 10835 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

TL

2 follow-up statements

993 
WWUS55 KRIW 082050
SVSRIW

Severe Weather Statement
National Weather Service Riverton WY
250 PM MDT FRI JUN 8 2018

WYC017-082059-
/O.CAN.KRIW.TO.W.0009.000000T0000Z-180608T2100Z/
Hot Springs-
250 PM MDT FRI JUN 8 2018

...THE TORNADO WARNING FOR NORTH CENTRAL HOT SPRINGS COUNTY IS
CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

LAT...LON 4413 10818 4396 10804 4387 10831 4390 10831
      4391 10839 4401 10844
TIME...MOT...LOC 2049Z 239DEG 16KT 4398 10828 

$$

WYC043-082100-
/O.CON.KRIW.TO.W.0009.000000T0000Z-180608T2100Z/
Washakie-
250 PM MDT FRI JUN 8 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 300 PM MDT FOR
NORTHWESTERN WASHAKIE COUNTY...
    
At 249 PM MDT, a severe thunderstorm capable of producing a tornado
was located 10 miles northwest of Winchester, or 16 miles west of
Worland, moving northeast at 20 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 tornadic thunderstorm will remain over mainly rural areas of
northwestern Washakie County.

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 4413 10818 4396 10804 4387 10831 4390 10831
      4391 10839 4401 10844
TIME...MOT...LOC 2049Z 239DEG 16KT 4398 10828 

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

TL

529 
WWUS55 KRIW 082057
SVSRIW

Severe Weather Statement
National Weather Service Riverton WY
257 PM MDT FRI JUN 8 2018

WYC043-082106-
/O.EXP.KRIW.TO.W.0009.000000T0000Z-180608T2100Z/
Washakie-
257 PM MDT FRI JUN 8 2018

...THE TORNADO WARNING FOR NORTHWESTERN WASHAKIE COUNTY WILL EXPIRE
AT 300 PM MDT...
    
The tornado threat has diminished and the Tornado Warning has been
cancelled. However, large hail and damaging winds remain likely and a
Severe Thunderstorm Warning remains in effect for the area.  

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Riverton.

Remember, a Severe Thunderstorm Warning still remains in effect for
western portions of Washakie County.

LAT...LON 4413 10818 4396 10804 4387 10831 4390 10831
      4391 10839 4401 10844
TIME...MOT...LOC 2056Z 239DEG 16KT 4398 10829 

$$

TL

The office that day

Everything else NWS Riverton, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 7, 6:02 PM MDT	Special Weather Statement	RIW	Johnson	28 min
Jun 7, 6:06 PM MDT	Special Weather Statement	RIW	Johnson	39 min
Jun 7, 6:33 PM MDT	Special Weather Statement	RIW	Johnson	27 min
Jun 7, 6:38 PM MDT	Severe Thunderstorm Warning	RIW	Johnson	52 min
Jun 7, 6:51 PM MDT	Special Weather Statement	RIW	Johnson	39 min
Jun 7, 7:17 PM MDT	Special Weather Statement	RIW	Johnson	28 min
Jun 8, 2:24 PM MDT	Special Weather Statement	RIW	Hot Springs	36 min
Jun 8, 3:00 PM MDT	Severe Thunderstorm Warning	RIW	Washakie	30 min
Jun 8, 3:22 PM MDT	Special Weather Statement	RIW	Park	38 min
Jun 8, 3:34 PM MDT	Special Weather Statement	RIW	Washakie	26 min
Jun 8, 4:04 PM MDT	Special Weather Statement	RIW		26 min
Jun 8, 4:49 PM MDT	Special Weather Statement	RIW	Big Horn	26 min
Jun 8, 5:06 PM MDT	Special Weather Statement	RIW	Johnson	39 min
Jun 8, 5:25 PM MDT	Severe Thunderstorm Warning	RIW	Johnson	50 min

Nearby

Tornado Warnings in Wyoming, 2018 Every tornado warning in 2018 Tornadoes 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.