Alert archive / Wyoming / Tornado Warnings in 1997

Tornado Warning 4, NWS Riverton, WY

June 13, 1997Big Horn County, Wyoming

NWS Riverton, WY issued this tornado warning at Jun 13, 1997, 7:32 PM MDT for Big Horn County, Wyoming. It was in force for 33 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 13, 1997, 7:32 PM MDT (01:32 UTC)
Expired
Jun 13, 1997, 8:05 PM MDT
In force
33 min
Issued by
NWS Riverton, WY
Area
Whole counties

County Big Horn County, WY

The radar

The Billings radar (KBLX), 155 km from the middle of the area, began a volume at 01:32 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.

What was reported inside it

TimeReportWhereRemark
Jun 13, 7:35 PM MDTTornado F0Basin, WY
Jun 13, 7:40 PM MDTHail 0.75Basin, 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 nearest sounding before it

Riverton, WY (KRIW), launched 00:00Z, 1.5 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-pSkew-T log-p diagram, Riverton, WY at 00:00Z on 1997-06-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 54 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Riverton, WY at 00:00Z on 1997-06-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 73 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
54 J/kg
Mixed-layer CIN
-51 J/kg
Mixed-layer LCL
1256 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
73 m²/s²
0-3 km storm-relative helicity
143 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

124 
WFUS01 KRIW 140138
TORRIW
WYC003-140205-

BULLETIN - EAS ACTIVATION
TORNADO WARNING...CORRECTED
NATIONAL WEATHER SERVICE RIVERTON WY
732 PM MDT FRI JUN 13 1997

* TORNADO WARNING FOR
  CENTRAL BIG HORN COUNTY - NORTH CENTRAL WYOMING

* UNTIL 805 PM MDT

* SOME LOCATIONS AFFECTED

  BASIN
  GREYBULL

* AT 725 PM MDT LOCAL LAW ENFORCEMENT REPORTED A TORNADO JUST SOUTH OF
  THE CITY OF BASIN MOVING MOVING NORTH AT ABOUT 20 MPH.

* THE STORM WITH THE TORNADO WILL BE NEAR THE TOWN OF GREYBULL BY 745
  PM.

IF YOU ARE NEAR THIS DANGEROUS STORM, TAKE COVER IMMEDIATELY IN THE
LOWEST FLOOR AND INNERMOST ROOM OF A BUILDING.

WCJIN-WYNW
AR

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 14, 2:15 PM MDTFlash Flood WarningRIWJohnson45 min
Jun 14, 2:15 PM MDTSevere Thunderstorm WarningRIWJohnson45 min
Jun 14, 4:25 PM MDTFlash Flood WarningRIWHot Springs115 min

Nearby

Tornado Warnings in Wyoming, 1997Every tornado warning in 1997Tornadoes in 1997

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; radar from the NEXRAD Level II archive.