Alert archive / Wyoming / Tornado Warnings in 2015

Tornado Warning 2, NWS Riverton, WY

May 16, 2015Park County, Wyoming

NWS Riverton, WY issued this tornado warning at May 16, 2015, 1:14 PM MDT for Park County, Wyoming. It was in force for 31 min. 3 reports 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: May 16, 2015, 1:14 PM MDT (19:14 UTC)
Expired: May 16, 2015, 1:45 PM MDT
In force: 31 min
Issued by: NWS Riverton, WY
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Park County, WY

What was reported inside it

Time	Report	Where	Remark
May 16, 1:15 PM MDT	TORNADO	17 E Cody, WY	ROPE TORNADO ON GROUND IN OPEN SPACE FROM ABOUT 115 PM TO 122 PM.
May 16, 1:20 PM MDT	FUNNEL CLOUD	16 E Cody, WY	SEVERAL FUNNEL CLOUDS IN THE STORM EAST OF CODY...NEARLY STATIONARY.
May 16, 1:26 PM MDT	HAIL 0.88	17 E Cody, WY	HAIL UP TO THE SIZE OF NICKELS COVERED US HIGHWAY 16 TO A DEPTH OF AT LEAST A FEW INCHES NEAR MILEPOST 71.

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, 7.2 hours before the alert went out and 155 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: 1603 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: 48 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.

713 
WFUS55 KRIW 161914
TORRIW
WYC029-161945-
/O.NEW.KRIW.TO.W.0002.150516T1914Z-150516T1945Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE RIVERTON WY
114 PM MDT SAT MAY 16 2015

THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A

* TORNADO WARNING FOR...
  EAST CENTRAL PARK COUNTY IN CENTRAL WYOMING...

* UNTIL 145 PM MDT

* AT 112 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR HWY 14/16/20 MILE MARKER 70...AND MOVING
  SOUTHEAST AT 10 MPH.

  HAZARD...TORNADO.

  SOURCE...WEATHER SPOTTERS REPORTED FUNNEL CLOUD.

  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...
  HWY 14/16/20 MILE MARKER 70 AROUND 120 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 4446 10856 4436 10857 4429 10879 4454 10891
      4461 10867
TIME...MOT...LOC 1914Z 337DEG 7KT 4449 10874

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

$$

BRAUN

3 follow-up statements

224 
WWUS55 KRIW 161928
SVSRIW

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
128 PM MDT SAT MAY 16 2015

WYC029-161945-
/O.CON.KRIW.TO.W.0002.000000T0000Z-150516T1945Z/
PARK WY-
128 PM MDT SAT MAY 16 2015

...A TORNADO WARNING REMAINS IN EFFECT FOR EAST CENTRAL PARK COUNTY
UNTIL 145 PM MDT...

AT 124 PM MDT...A CONFIRMED TORNADO WAS LOCATED NEAR HWY 14/16/20
MILE MARKER 70...AND MOVING SOUTHEAST AT 10 MPH.

HAZARD...TORNADO.

SOURCE...LAW ENFORCEMENT CONFIRMED TORNADO.

IMPACT...EXPECT DAMAGE TO MOBILE HOMES...ROOFS AND VEHICLES.

THIS TORNADIC STORM WILL AFFECT MAINLY RURAL AREAS OF EAST CENTRAL
PARK COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPEAT...A TORNADO IS ON THE GROUND. 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 4446 10856 4436 10857 4429 10879 4454 10891
      4461 10867
TIME...MOT...LOC 1928Z 337DEG 7KT 4446 10873

TORNADO...OBSERVED
HAIL...<.75IN

$$

BRAUN

871 
WWUS55 KRIW 161934
SVSRIW

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
134 PM MDT SAT MAY 16 2015

WYC029-161945-
/O.CON.KRIW.TO.W.0002.000000T0000Z-150516T1945Z/
PARK WY-
134 PM MDT SAT MAY 16 2015

...A TORNADO WARNING REMAINS IN EFFECT FOR EAST CENTRAL PARK COUNTY
UNTIL 145 PM MDT...

AT 122 PM MDT...A CONFIRMED TORNADO WAS LOCATED NEAR HWY 14/16/20 
MILE MARKER 70...AND MOVING SOUTHEAST AT 10 MPH. 

HAZARD...TORNADO.

SOURCE...LAW ENFORCEMENT CONFIRMED TORNADO.

IMPACT...EXPECT DAMAGE TO MOBILE HOMES...ROOFS AND VEHICLES.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF EASTERN PARK COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPEAT...A TORNADO IS ON THE GROUND. 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 4446 10856 4436 10857 4429 10879 4454 10891
      4461 10867
TIME...MOT...LOC 1934Z 337DEG 7KT 4445 10872

TORNADO...OBSERVED
HAIL...<.75IN

$$

BRAUN

017 
WWUS55 KRIW 161943
SVSRIW

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
143 PM MDT SAT MAY 16 2015

WYC029-161953-
/O.EXP.KRIW.TO.W.0002.000000T0000Z-150516T1945Z/
PARK WY-
143 PM MDT SAT MAY 16 2015

...THE TORNADO WARNING FOR EAST CENTRAL PARK COUNTY WILL EXPIRE AT
145 PM MDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
HOWEVER...SMALL HAIL AND HEAVY RAIN ARE STILL POSSIBLE WITH THIS 
THUNDERSTORM.

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

LAT...LON 4446 10856 4436 10857 4429 10879 4454 10891
      4461 10867
TIME...MOT...LOC 1943Z 337DEG 7KT 4443 10871

$$

BRAUN

The office that day

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

Issued	Product	Office	Counties	Lasted
May 16, 1:05 PM MDT	Special Weather Statement	RIW		40 min
May 16, 1:11 PM MDT	Special Weather Statement	RIW		49 min
May 16, 1:46 PM MDT	Special Weather Statement	RIW	Big Horn	29 min
May 16, 5:43 PM MDT	Special Weather Statement	RIW	Sheridan	32 min

Nearby

Tornado Warnings in Wyoming, 2015 Every tornado warning in 2015 Tornadoes in 2015

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.