Alert archive / Wyoming / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 17, NWS Cheyenne, WY

June 1, 1997Niobrara County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 1, 1997, 4:42 PM MDT for Niobrara County, Wyoming. It was in force for 63 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 1, 1997, 4:42 PM MDT (22:42 UTC)
Expired
Jun 1, 1997, 5:45 PM MDT
In force
63 min
Issued by
NWS Cheyenne, WY
Area
Whole counties

County Niobrara County, WY

The watch it was issued in

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

IssuedProductOfficeLasted
Jun 1, 2:45 PM MDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 10.7 hours before the alert went out and 171 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, Rapid City, SD at 12:00Z on 1997-06-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Rapid City, SD at 12:00Z on 1997-06-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 192 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
1 J/kg
Mixed-layer CIN
-382 J/kg
Mixed-layer LCL
2462 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
192 m²/s²
0-3 km storm-relative helicity
198 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 KCYS 012243 RRA
SVRCYS
WYC027-012345-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
442 PM MDT SUN JUN 1 1997

* SEVERE THUNDERSTORM WARNING FOR
  SOUTHERN NIOBRARA COUNTY IN EASTERN WYOMING

* UNTIL 545 PM MDT

* SOME LOCATIONS AFFECTED
  MANVILLE                             BY 507 PM MDT

* AT 440 PM MDT...A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
  RADAR 16 MILES SOUTHWEST OF LUSK OR 10 MILES SOUTHWEST OF MANVILLE
  MOVING EAST AT 15 MPH.


 
LARGE HAIL IS LIKELY WITH THIS STORM.  SEEK SHELTER INSIDE A STURDY
BUILDING AWAY FROM ALL WINDOWS UNTIL THE STORM PASSES.

JMH

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 1, 2:45 PM MDT, 1 hour 57 minutes before
WYZ059>060-020000-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
245 PM MDT SUN JUN 1 1997

...SEVERE THUNDERSTORM WATCH FOR EAST CENTRAL WYOMING UNTIL 9 PM THIS
EVENING...

A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR EAST CENTRAL WYOMING
AND IS VALID UNTIL 9 PM THIS SUNDAY EVENING.  THE COUNTIES IN EAST
CENTRAL WYOMING INCLUDED IN THIS WATCH ARE CONVERSE AND NIOBRARA.  SOME
TOWNS INCLUDED IN THE WATCH ARE DOUGLAS AND LUSK.

THE AIRMASS OVER EAST CENTRAL WYOMING IS MOIST AND UNSTABLE.  A COLD
FRONT APPROACHING THE AREA ALONG WITH GOOD SURFACE HEATING WILL HELP
LIFT THIS UNSTABLE AIR TO FORM STRONG THUNDERSTORMS THIS AFTERNOON AND
EVENING.  SOME OF THESE WILL LIKELY BECOME SEVERE...PRODUCING THREE
QUARTER INCH DIAMETER HAIL OR LARGER AND WIND GUSTS GREATER THAN 55
MPH.

PEOPLE IN EAST CENTRAL WYOMING SHOULD BE ALERT TO APPROACHING STORMS.
LISTEN TO NOAA WEATHER RADIO...LOCAL TELEVISION AND YOUR CABLE
TELEVISION PROVIDER FOR POSSIBLE WARNINGS AND BE PREPARED TO SEEK
SHELTER.  REPORT ANY LARGE DAMAGING HAIL OR DAMAGING WIND GUSTS TO THE
NEAREST LAW ENFORCEMENT AGENCY FOR RELAY TO THE NATIONAL WEATHER
SERVICE.

WCJIN-WYNE
JMH
Special weather statement, Jun 1, 2:49 PM MDT, 1 hour 53 minutes before
WYZ059>060-020000-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
245 PM MDT SUN JUN 1 1997

...SEVERE THUNDERSTORM WATCH FOR EAST CENTRAL WYOMING UNTIL 9 PM THIS
EVENING...

A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR EAST CENTRAL WYOMING
AND IS VALID UNTIL 9 PM THIS SUNDAY EVENING.  THE COUNTIES IN EAST
CENTRAL WYOMING INCLUDED IN THIS WATCH ARE CONVERSE AND NIOBRARA.  SOME
TOWNS INCLUDED IN THE WATCH ARE DOUGLAS AND LUSK.

THE AIRMASS OVER EAST CENTRAL WYOMING IS MOIST AND UNSTABLE.  A COLD
FRONT APPROACHING THE AREA ALONG WITH GOOD SURFACE HEATING WILL HELP
LIFT THIS UNSTABLE AIR TO FORM STRONG THUNDERSTORMS THIS AFTERNOON AND
EVENING.  SOME OF THESE WILL LIKELY BECOME SEVERE...PRODUCING THREE
QUARTER INCH DIAMETER HAIL OR LARGER AND WIND GUSTS GREATER THAN 55
MPH.

PEOPLE IN EAST CENTRAL WYOMING SHOULD BE ALERT TO APPROACHING STORMS.
LISTEN TO NOAA WEATHER RADIO...LOCAL TELEVISION AND YOUR CABLE
TELEVISION PROVIDER FOR POSSIBLE WARNINGS AND BE PREPARED TO SEEK
SHELTER.  REPORT ANY LARGE DAMAGING HAIL OR DAMAGING WIND GUSTS TO THE
NEAREST LAW ENFORCEMENT AGENCY FOR RELAY TO THE NATIONAL WEATHER
SERVICE.

WCJIN-WYNE
JMH

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 1, 3:58 PM MDTSevere Thunderstorm WarningCYSPlatte47 min
Jun 1, 4:25 PM MDTSevere Thunderstorm WarningCYSNiobrara45 min
Jun 1, 4:31 PM MDTSevere Thunderstorm WarningCYSGoshen, Laramie44 min
Jun 1, 5:07 PM MDTSevere Thunderstorm WarningCYSNiobrara48 min
Jun 1, 5:19 PM MDTSevere Thunderstorm WarningCYSLaramie46 min
Jun 1, 5:48 PM MDTTornado WarningCYSLaramie17 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.