Alert archive / Wyoming / Tornado Warnings in 2001

Tornado Warning 3, NWS Riverton, WY

June 26, 2001Big Horn County, Wyoming

NWS Riverton, WY issued this tornado warning at Jun 26, 2001, 7:15 PM MDT for Big Horn County, Wyoming. It was in force for 45 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 26, 2001, 7:15 PM MDT (01:15 UTC)
Expired: Jun 26, 2001, 8:00 PM MDT
In force: 45 min
Issued by: NWS Riverton, WY
Area: Whole counties

County Big Horn County, WY

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, 1.3 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.

302 
WUUS55 KRIW 270123
TORRIW
WYC003-270200-

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

THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A

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

* UNTIL 800 PM MDT

* AT 721 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  A POSSIBLE TORNADO 4 MILES NORTHEAST OF GREYBULL...MOVING NORTH AT  
  20 MPH.

* THE TORNADO WILL BE...
  6 MILES NORTHEAST OF GREYBULL AROUND 725 PM MDT

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD PREPARE 
FOR DAMAGING WINDS IN EXCESS OF 55 MPH...LARGE HAIL...AND DEADLY 
LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY 
INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. 
REMEMBER...SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE 
TORNADOES WITH LITTLE OR NO ADVANCE WARNING. REMAIN CALM BUT BE 
ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS.

$$
LAT...LON 4432 10845 4432 10783 4496 10790 4498 10853

SULLIVAN

WCJIN-WYNW

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 26, 6:50 PM MDT	Tornado Warning	RIW	Big Horn	25 min
Jun 26, 7:13 PM MDT	Severe Thunderstorm Warning	RIW	Big Horn	47 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; the sounding from the Mesonet's radiosonde archive.