Alert archive / Wyoming / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 36, NWS Cheyenne, WY

June 18, 1997Laramie County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 18, 1997, 2:59 PM MDT for Laramie County, Wyoming. It was in force for 46 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 18, 1997, 2:59 PM MDT (20:59 UTC)
Expired
Jun 18, 1997, 3:45 PM MDT
In force
46 min
Issued by
NWS Cheyenne, WY
Area
Whole counties

County Laramie County, WY

The radar

The Cheyenne radar (KCYS), 20 km from the middle of the area, began a volume at 21:00 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

Denver, CO (KDNR), launched 12:00Z, 9.0 hours before the alert went out and 202 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, Denver, CO at 12:00Z on 1997-06-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Denver, CO at 12:00Z on 1997-06-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 86 square meters per square second.1939Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2353 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
86 m²/s²
0-3 km storm-relative helicity
100 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.

653 
WUUS1 KCYS 182101
SVRCYS
WYC021-182145-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
259 PM MDT WED JUN 18 1997

* SEVERE THUNDERSTORM WARNING FOR
  SOUTHEASTERN LARAMIE COUNTY IN SOUTHEASTERN WYOMING

* UNTIL 345 PM MDT

* SOME AFFECTED LOCATIONS INCLUDE
  HILLSDALE       300 PM
  BURNS           315 PM
  PINE BLUFFS     330 PM

* AT 259 PM MDT...A SEVERE THUNDERSTORM WAS LOCATED 15 MILES EAST OF
  CHEYENNE OVER HILLSDALE.  THIS STORM WAS MOVING EAST AT 15 MPH
  ALONG I-80.  THIS STORM HAS A HISTORY OF 1 1/2 INCH SIZED HAIL.
 
 
TAKE SHELTER INSIDE A STRONG BUILDING.  DO NOT STAND BY WINDOWS.

WCJIN-WYSE
DMM

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jun 18, 10:05 AM MDT, 4 hours 54 minutes before
WYZ059>070-NEZ001>003-019>021-054-055-190000-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
1005 AM MDT WED JUN 18 1997

THE SEVERE WEATHER POTENTIAL IN THE CHEYENNE NWS COUNTY WARNING AREA

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 18, 2:03 PM MDTTornado WarningCYSLaramie32 min
Jun 18, 2:38 PM MDTTornado WarningCYSLaramie32 min
Jun 18, 3:45 PM MDTSevere Thunderstorm WarningCYSLaramie30 min

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.