Alert archive / Wyoming / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 21, NWS Riverton, WY

June 14, 1997Washakie County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jun 14, 1997, 6:00 PM MDT for Washakie County, Wyoming. It was in force for 30 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 14, 1997, 6:00 PM MDT (00:00 UTC)
Expired
Jun 14, 1997, 6:30 PM MDT
In force
30 min
Issued by
NWS Riverton, WY
Area
Whole counties

County Washakie County, WY

The radar

The Riverton/Lander radar (KRIW), 113 km from the middle of the area, began a volume at 00:06 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 00:00Z, 0.0 hours before the alert went out and 109 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 1997-06-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 17 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 1997-06-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -7 square meters per square second.193958Sfc1 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
17 J/kg
Mixed-layer CIN
-185 J/kg
Mixed-layer LCL
2337 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
-7 m²/s²
0-3 km storm-relative helicity
-34 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.

000 
TTAA00 KRIW 150000 RRA
SVRRIW
WYC043-150030-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE RIVERTON WY
600 PM MDT SAT JUN 14 1997

* SEVERE THUNDERSTORM WARNING FOR
  NORTHERN WASHAKIE COUNTY - NORTH CENTRAL WYOMING

* UNTIL 630 PM MDT
 
* SOME LOCATIONS AFFECTED

  WORLAND
  TEN SLEEP

* AT 540 PM MDT WEATHER OBSERVERS AT THE WORLAND AIRPORT HAIL
  3/4 INCH IN DIAMETER 3 MILES SOUTHEAST OF WORLAND MOVING MOVING
  NORTHEAST AT 20 MPH.

* THE STORM WILL BE NORTH OF TEN SLEEP AT 620 PM.

AS THE STORM APPROACHES GO INSIDE A STURDY SHELTER THAT IS AWAY FROM
LOW LYING AREA PRONE TO FLOODING.

STRONG GUSTY WINDS...FREQUENT LIGHTNING...VERY HEAVY RAINFALL AND LARGE
HAIL MAY ACCOMPANY THIS STORM.
 
WCJIN-WYNW

SHEETS

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 14, 9:02 PM MDTFlash Flood WarningRIWPark3 hr
Jun 14, 9:26 PM MDTFlash Flood WarningRIWPark2 hr

Nearby

Severe Thunderstorm Warnings in Wyoming, 1997Every severe thunderstorm warning 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.