Alert archive / Wyoming / Tornado Warnings in 2018

Tornado Warning 13, NWS Riverton, WY

June 29, 2018Washakie County, Wyoming

NWS Riverton, WY issued this tornado warning at Jun 29, 2018, 11:50 AM MDT for Washakie County, Wyoming. It was in force for 25 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 29, 2018, 11:50 AM MDT (17:50 UTC)
Expired
Jun 29, 2018, 12:15 PM MDT
In force
25 min
Issued by
NWS Riverton, WY
Area
Storm-based polygon
Tornado
Radar indicated
Hail
1.0 in

County Washakie County, WY

The radar

The Riverton/Lander radar (KRIW), 115 km from the middle of the area, began a volume at 17:51 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

TimeReportWhereRemark
Jun 29, 12:14 PM MDTFUNNEL CLOUD14 Nw Worland, WY

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 12:00Z, 5.8 hours before the alert went out and 115 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-pSkew-T log-p diagram, Riverton, WY at 12:00Z on 2018-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 256 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Riverton, WY at 12:00Z on 2018-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 59 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
256 J/kg
Mixed-layer CIN
-222 J/kg
Mixed-layer LCL
1500 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
59 m²/s²
0-3 km storm-relative helicity
84 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.3

Open this sounding in Storm Lab

The text

As transmitted.

656 
WFUS55 KRIW 291750
TORRIW
WYC043-291815-
/O.NEW.KRIW.TO.W.0013.180629T1750Z-180629T1815Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Riverton WY
1150 AM MDT FRI JUN 29 2018

The National Weather Service in Riverton has issued a

* Tornado Warning for...
  Northwestern Washakie County in central Wyoming...

* Until 1215 PM MDT.
    
* At 1150 AM MDT, a severe thunderstorm capable of producing a 
  tornado was located 20 miles south of Otto, or 20 miles west of 
  Worland, moving northeast at 15 to 20 mph.

  HAZARD...Tornado and quarter 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 4402 10846 4415 10853 4417 10844 4417 10816
      4407 10806
TIME...MOT...LOC 1750Z 242DEG 14KT 4411 10838 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

CNJ
1 follow-up statement
142 
WWUS55 KRIW 291803
SVSRIW

Severe Weather Statement
National Weather Service Riverton WY
1203 PM MDT FRI JUN 29 2018

WYC043-291815-
/O.CON.KRIW.TO.W.0013.000000T0000Z-180629T1815Z/
Washakie-
1203 PM MDT FRI JUN 29 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1215 PM MDT FOR
NORTHWESTERN WASHAKIE COUNTY...
    
At 1202 PM MDT, a severe thunderstorm capable of producing a tornado 
was located 17 miles northwest of Worland, moving east at 25 mph.

HAZARD...Tornado and quarter 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 around Platte Pipeline Road and 15 Mile 
Road.

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 4407 10833 4414 10837 4417 10834 4417 10816
      4407 10806
TIME...MOT...LOC 1802Z 254DEG 20KT 4413 10828 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

CNJ

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 28, 8:29 PM MDTSpecial Weather StatementRIWBig Horn46 min
Jun 29, 10:39 AM MDTSpecial Weather StatementRIWBig Horn36 min
Jun 29, 11:10 AM MDTSpecial Weather StatementRIWHot Springs35 min
Jun 29, 11:14 AM MDTTornado WarningRIWBig Horn, Washakie16 min
Jun 29, 11:28 AM MDTTornado WarningRIWBig Horn, Washakie32 min
Jun 29, 11:33 AM MDTSpecial Weather StatementRIWBig Horn42 min
Jun 29, 11:46 AM MDTSpecial Weather StatementRIWBig Horn44 min
Jun 29, 11:58 AM MDTTornado WarningRIWBig Horn32 min
Jun 29, 12:15 PM MDTTornado WarningRIWBig Horn, Washakie30 min
Jun 29, 12:25 PM MDTSpecial Weather StatementRIWJohnson35 min
Jun 29, 12:37 PM MDTSpecial Weather StatementRIWBig Horn23 min
Jun 29, 12:46 PM MDTSpecial Weather StatementRIWWashakie29 min
Jun 29, 12:55 PM MDTSpecial Weather StatementRIWJohnson35 min
Jun 29, 12:59 PM MDTSpecial Weather StatementRIWBig Horn46 min
Jun 29, 1:09 PM MDTSpecial Weather StatementRIWWashakie36 min
Jun 29, 1:12 PM MDTSpecial Weather StatementRIW33 min
Jun 29, 1:17 PM MDTSevere Thunderstorm WarningRIWBig Horn, Johnson43 min
Jun 29, 1:25 PM MDTSevere Thunderstorm WarningRIWJohnson35 min
Jun 29, 1:57 PM MDTSevere Thunderstorm WarningRIWJohnson33 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.