Alert archive / Wyoming / Tornado Warnings in 2016

Tornado Warning 2, NWS Riverton, WY

May 9, 2016Washakie County, Wyoming

NWS Riverton, WY issued this tornado warning at May 9, 2016, 4:36 PM MDT for Washakie County, Wyoming. It was in force for 39 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 9, 2016, 4:36 PM MDT (22:36 UTC)
Expired: May 9, 2016, 5:15 PM MDT
In force: 39 min
Issued by: NWS Riverton, WY
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.5 in

County Washakie County, WY

The radar

The Riverton/Lander radar (KRIW), 106 km from the middle of the area, began a volume at 22:36 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, 10.6 hours before the alert went out and 105 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1087 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 127 m²/s²
0-3 km storm-relative helicity: 166 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

059 
WFUS55 KRIW 092236
TORRIW
WYC043-092315-
/O.NEW.KRIW.TO.W.0002.160509T2236Z-160509T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE RIVERTON WY
436 PM MDT MON MAY 9 2016

THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN WASHAKIE COUNTY IN CENTRAL WYOMING...

* UNTIL 515 PM MDT
    
* AT 436 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED 13 MILES NORTHWEST OF WINCHESTER...WHICH IS 21
  MILES WEST OF WORLAND...MOVING EAST AT 10 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 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 4410 10808 4388 10813 4393 10843 4399 10843
      4399 10846 4406 10847
TIME...MOT...LOC 2236Z 272DEG 11KT 4397 10838 

TORNADO...RADAR INDICATED
HAIL...1.50IN

$$

21

2 follow-up statements

682 
WWUS55 KRIW 092255
SVSRIW

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
455 PM MDT MON MAY 9 2016

WYC043-092315-
/O.CON.KRIW.TO.W.0002.000000T0000Z-160509T2315Z/
WASHAKIE-
455 PM MDT MON MAY 9 2016

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 515 PM MDT FOR
NORTHWESTERN WASHAKIE COUNTY...
    
AT 453 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED 7 MILES NORTHWEST OF WINCHESTER...WHICH IS 15 MILES WEST
OF WORLAND...MOVING EAST AT 15 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...SOUTH OF HIGHWAY 431.

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 4388 10813 4393 10836 4396 10837 4398 10837
      4406 10836 4405 10809
TIME...MOT...LOC 2253Z 277DEG 14KT 4395 10825 

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

$$

21

864 
WWUS55 KRIW 092313
SVSRIW

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
513 PM MDT MON MAY 9 2016

WYC043-092323-
/O.EXP.KRIW.TO.W.0002.000000T0000Z-160509T2315Z/
WASHAKIE-
513 PM MDT MON MAY 9 2016

...THE TORNADO WARNING FOR NORTHWESTERN WASHAKIE COUNTY WILL EXPIRE
AT 515 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.

LAT...LON 4388 10813 4393 10836 4396 10837 4398 10837
      4406 10836 4405 10809
TIME...MOT...LOC 2311Z 272DEG 11KT 4395 10825 

$$

21

The office that day

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

Issued	Product	Office	Counties	Lasted
May 8, 6:03 PM MDT	Areal Flood Advisory	RIW	Lincoln, Sublette	6 hr
May 8, 6:18 PM MDT	Special Weather Statement	RIW	Teton	57 min
May 8, 8:02 PM MDT	Severe Thunderstorm Warning	RIW	Teton	28 min
May 8, 8:16 PM MDT	Severe Thunderstorm Warning	RIW	Teton	18 min
May 8, 8:41 PM MDT	Flash Flood Warning	RIW	Lincoln, Teton	3 hr
May 8, 9:00 PM MDT	Special Weather Statement	RIW	Lincoln	45 min
May 9, 4:09 PM MDT	Special Weather Statement	RIW	Hot Springs	51 min
May 9, 4:23 PM MDT	Severe Thunderstorm Warning	RIW	Hot Springs, Washakie	37 min
May 9, 5:10 PM MDT	Special Weather Statement	RIW	Hot Springs	50 min
May 9, 5:16 PM MDT	Special Weather Statement	RIW	Washakie	29 min
May 9, 5:23 PM MDT	Special Weather Statement	RIW	Big Horn	52 min
May 9, 5:39 PM MDT	Special Weather Statement	RIW	Natrona	51 min
May 9, 5:56 PM MDT	Special Weather Statement	RIW	Hot Springs	49 min

Nearby

Tornado Warnings in Wyoming, 2016 Every tornado warning in 2016 Tornadoes in 2016

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.