Alert archive / Wyoming / Tornado Warnings in 2001

Tornado Warning 2, NWS Riverton, WY

June 26, 2001Big Horn County, Wyoming

NWS Riverton, WY issued this tornado warning at Jun 26, 2001, 6:50 PM MDT for Big Horn County, Wyoming. It was in force for 25 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jun 26, 2001, 6:50 PM MDT (00:50 UTC)
Expired: Jun 26, 2001, 7:15 PM MDT
In force: 25 min
Issued by: NWS Riverton, WY
Area: Whole counties

County Big Horn County, WY

What was reported inside it

Time	Report	Where	Remark
Jun 26, 6:56 PM MDT	Tornado F1	Greybull, WY
Jun 26, 7:02 PM MDT	Hail 0.75	Greybull, WY

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 26, 5:00 PM MDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Riverton, WY (KRIW), launched 00:00Z, 0.8 hours before the alert went out and 165 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: 145 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 3130 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

095 
WFUS55 KRIW 270052
TORRIW
WYC003-270115-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE RIVERTON WY
650 PM MDT TUE JUN 26 2001

THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN BIG HORN COUNTY IN NORTH CENTRAL WYOMING

* UNTIL 715 PM MDT

* AT 650 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS WITH POSSIBLE TORNADOES FROM 18 MILES SOUTHWEST OF
  OTTO TO 14 MILES EAST OF GREYBULL...OR FROM 26 MILES SOUTHWEST     
  OF BASIN TO 14 MILES EAST OF GREYBULL...MOVING NORTH AT 20 MPH.

  AT 645 PM MDT THE PUBLIC REPORTED A BRIEF TORNADO ABOUT 10 MILES
  SOUTHWEST OF BASIN. 

THIS IS A DANGEROUS STORM SITUATION. ACT QUICKLY. IF YOU ARE IN THE
PATH OF THIS TORNADO MOVE TO A SHELTER BELOW GROUND IF AVAILABLE.
OTHERWISE... GO TO A SMALL INTERIOR ROOM ON THE LOWEST FLOOR. AVOID
WINDOWS AND DOORS. ABANDON CARS AND MOBILE HOMES FOR A STURDIER
BUILDING OR GET INTO A DITCH OR CULVERT.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN RIVERTON.

$$
LAT...LON 4419 10854 4476 10858 4473 10779 4419 10777

NOLL

WCJIN-WYNW

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 26, 7:13 PM MDT	Severe Thunderstorm Warning	RIW	Big Horn	47 min
Jun 26, 7:15 PM MDT	Tornado Warning	RIW	Big Horn	45 min
Jun 27, 2:05 PM MDT	Severe Thunderstorm Warning	RIW	Big Horn, Washakie	40 min
Jun 27, 2:28 PM MDT	Severe Thunderstorm Warning	RIW	Hot Springs, Washakie	32 min

Nearby

Tornado Warnings in Wyoming, 2001 Every tornado warning in 2001 Tornadoes in 2001

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.