Alert archive / Wyoming / Tornado Warnings in 2011

Tornado Warning 7, NWS Riverton, WY

July 13, 2011Hot Springs County, Park County, Washakie County, Wyoming

NWS Riverton, WY issued this tornado warning at Jul 13, 2011, 1:54 PM MDT for Hot Springs County, Park County, Washakie County, Wyoming. It was in force for 36 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: Jul 13, 2011, 1:54 PM MDT (19:54 UTC)
Expired: Jul 13, 2011, 2:30 PM MDT
In force: 36 min
Issued by: NWS Riverton, WY
Area: Storm-based polygon

Counties Hot Springs County, WY, Park County, WY, Washakie County, WY

The radar

The Riverton/Lander radar (KRIW), 107 km from the middle of the area, began a volume at 19:56 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, 7.9 hours before the alert went out and 107 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: 197 J/kg
Mixed-layer CIN: -107 J/kg
Mixed-layer LCL: 953 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 33 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

112 
WFUS55 KRIW 131954
TORRIW
WYC017-029-043-132030-
/O.NEW.KRIW.TO.W.0007.110713T1954Z-110713T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE RIVERTON WY
154 PM MDT WED JUL 13 2011

THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A

* TORNADO WARNING FOR...
  NORTH CENTRAL HOT SPRINGS COUNTY IN CENTRAL WYOMING...
  EXTREME SOUTHEASTERN PARK COUNTY IN NORTHWEST WYOMING...
  NORTHWESTERN WASHAKIE COUNTY IN NORTH CENTRAL WYOMING...

* UNTIL 230 PM MDT

* AT 152 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED NEAR HWY JCT 431 AND 120...OR 18 MILES SOUTHEAST
  OF MEETEETSE...AND MOVING NORTHEAST AT 15 MPH.

* THIS DANGEROUS STORM WILL BE NEAR...
  HWY JCT 431 AND 120...GOOSEBERRY CREEK AND STATE HWY 120 MILE
  MARKER 40 AROUND 205 PM MDT.
  STATE HWY 120 MILE MARKER 30 AROUND 210 PM MDT.
  STATE HWY 431 MILE MARKER 20 AROUND 230 PM MDT.

OTHER LOCATIONS IMPACTED BY THIS DANGEROUS STORM INCLUDE STATE HWY
171 AND STATE HWY 431 MILE MARKER 30.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS TORNADO WARNING REPLACES THE SEVERE THUNDERSTORM WARNING THAT
WAS IN EFFECT FOR THE SAME AREA.

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
RIVERTON AT 1-800-211-1448.

LAT...LON 4401 10832 4382 10867 4396 10884 4417 10854
      4417 10852
TIME...MOT...LOC 1954Z 228DEG 13KT 4395 10866

$$

BERC

3 follow-up statements

334 
WWUS55 KRIW 132004
SVSRIW

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
204 PM MDT WED JUL 13 2011

WYC017-029-043-132030-
/O.CON.KRIW.TO.W.0007.000000T0000Z-110713T2030Z/
PARK WY-HOT SPRINGS WY-WASHAKIE WY-
204 PM MDT WED JUL 13 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN WASHAKIE...
NORTH CENTRAL HOT SPRINGS AND EXTREME SOUTHEASTERN PARK COUNTIES
UNTIL 230 PM MDT...

AT 201 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR HWY JCT 431 AND 120...OR 18 MILES SOUTHEAST OF
MEETEETSE...MOVING NORTHEAST AT 15 MPH.

IN ADDITION...AT 145 PM QUARTER SIZED HAIL WAS REPORTED WITH THIS 
STORM.

THIS DANGEROUS STORM WILL BE NEAR...
  STATE HWY 120 MILE MARKER 30 AROUND 210 PM MDT.
  STATE HWY 431 MILE MARKER 20 AROUND 230 PM MDT.

OTHER LOCATIONS IMPACTED BY THIS DANGEROUS STORM INCLUDE STATE HWY
431 MILE MARKER 30.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
RIVERTON AT 1-800-211-1448.

LAT...LON 4401 10832 4382 10867 4396 10884 4417 10854
      4417 10852
TIME...MOT...LOC 2004Z 228DEG 13KT 4397 10862

$$

BERC

702 
WWUS55 KRIW 132015
SVSRIW

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
215 PM MDT WED JUL 13 2011

WYC017-029-043-132030-
/O.CON.KRIW.TO.W.0007.000000T0000Z-110713T2030Z/
PARK WY-HOT SPRINGS WY-WASHAKIE WY-
215 PM MDT WED JUL 13 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN WASHAKIE...
NORTH CENTRAL HOT SPRINGS AND EXTREME SOUTHEASTERN PARK COUNTIES
UNTIL 230 PM MDT...

AT 215 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR HWY JCT 431 AND 120...OR 18 MILES SOUTHEAST OF
MEETEETSE...MOVING NORTHEAST AT 15 MPH.

THIS DANGEROUS STORM WILL BE NEAR...
  STATE HWY 431 MILE MARKER 20 AROUND 230 PM MDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
RIVERTON AT 1-800-211-1448.

LAT...LON 4401 10832 4382 10867 4396 10884 4417 10854
      4417 10852
TIME...MOT...LOC 2016Z 228DEG 13KT 4400 10857

$$

BERC

505 
WWUS55 KRIW 132028
SVSRIW

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
228 PM MDT WED JUL 13 2011

WYC017-029-043-132037-
/O.EXP.KRIW.TO.W.0007.000000T0000Z-110713T2030Z/
PARK WY-HOT SPRINGS WY-WASHAKIE WY-
228 PM MDT WED JUL 13 2011

...THE TORNADO WARNING FOR NORTHWESTERN WASHAKIE...NORTH CENTRAL HOT
SPRINGS AND EXTREME SOUTHEASTERN PARK COUNTIES WILL EXPIRE AT 230 PM
MDT...

THE TORNADO THREAT HAS DIMINISHED...THEREFORE THE TORNADO WARNING HAS
EXPIRED. HOWEVER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT
FOR THE AREA.  HOWEVER SMALL HAIL AND HEAVY RAIN ARE STILL POSSIBLE
WITH THIS THUNDERSTORM.

REMEMBER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR 
NORTHWEST WASHAKIE AND FAR SOUTHWEST BIG HORN COUNTIES UNTIL 315 PM.

REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
RIVERTON AT 1-800-211-1448.

LAT...LON 4401 10832 4382 10867 4396 10884 4417 10854
      4417 10852
TIME...MOT...LOC 2027Z 228DEG 13KT 4403 10853

$$

BERC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 6:00 PM MDT	Special Weather Statement	RIW	Big Horn	60 min
Jul 13, 1:13 PM MDT	Special Weather Statement	RIW	Hot Springs	47 min
Jul 13, 1:30 PM MDT	Special Weather Statement	RIW	Sublette	30 min
Jul 13, 1:37 PM MDT	Special Weather Statement	RIW	Hot Springs	38 min
Jul 13, 1:45 PM MDT	Severe Thunderstorm Warning	RIW	Big Horn, Hot Springs, Park, Washakie	45 min
Jul 13, 2:05 PM MDT	Special Weather Statement	RIW		40 min
Jul 13, 2:09 PM MDT	Special Weather Statement	RIW	Sweetwater	51 min
Jul 13, 2:25 PM MDT	Severe Thunderstorm Warning	RIW	Big Horn, Washakie	33 min
Jul 13, 2:33 PM MDT	Special Weather Statement	RIW	Natrona	42 min
Jul 13, 2:41 PM MDT	Special Weather Statement	RIW	Teton	49 min
Jul 13, 2:50 PM MDT	Special Weather Statement	RIW	Big Horn	40 min
Jul 13, 2:58 PM MDT	Special Weather Statement	RIW		47 min
Jul 13, 2:59 PM MDT	Special Weather Statement	RIW	Teton	46 min
Jul 13, 3:01 PM MDT	Special Weather Statement	RIW		44 min
Jul 13, 3:12 PM MDT	Special Weather Statement	RIW	Sublette	48 min
Jul 13, 3:21 PM MDT	Special Weather Statement	RIW	Hot Springs	39 min
Jul 13, 3:26 PM MDT	Special Weather Statement	RIW		34 min
Jul 13, 3:28 PM MDT	Special Weather Statement	RIW	Sweetwater	47 min
Jul 13, 3:33 PM MDT	Special Weather Statement	RIW	Hot Springs	27 min
Jul 13, 3:49 PM MDT	Special Weather Statement	RIW	Big Horn	41 min
Jul 13, 4:00 PM MDT	Special Weather Statement	RIW	Hot Springs	45 min
Jul 13, 4:07 PM MDT	Special Weather Statement	RIW		38 min
Jul 13, 4:36 PM MDT	Special Weather Statement	RIW	Sweetwater	39 min
Jul 13, 4:48 PM MDT	Special Weather Statement	RIW	Johnson	42 min
Jul 13, 5:27 PM MDT	Special Weather Statement	RIW		48 min
Jul 13, 5:33 PM MDT	Severe Thunderstorm Warning	RIW	Johnson	57 min
Jul 13, 5:42 PM MDT	Special Weather Statement	RIW	Natrona	48 min

Nearby

Tornado Warnings in Wyoming, 2011 Every tornado warning in 2011 Tornadoes in 2011

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.