Alert archive / Wyoming / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 37, NWS Cheyenne, WY

June 18, 1997Laramie County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 18, 1997, 3:45 PM MDT for Laramie 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 18, 1997, 3:45 PM MDT (21:45 UTC)
Expired
Jun 18, 1997, 4:15 PM MDT
In force
30 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 21:45 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 watch it was issued in

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

IssuedProductOfficeLasted
Jun 18, 3:15 PM MDTTornado WatchSPC6 hr

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 9.8 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.

000 
TTAA00 KCYS 182147 RRA
SVRCYS
WYC021-182215-

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

* SEVERE THUNDERSTORM WARNING FOR
  SOUTHEASTERN LARAMIE COUNTY IN SOUTHEASTERN WYOMING

* UNTIL 415 PM MDT

* SOME AFFECTED LOCATIONS INCLUDE
  CARPENTER    345 PM

* AT 345 PM...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER
  CARPENTER.  MOVEMENT WAS EAST AT 20 MPH.  THIS STORM IS LIKELY
  PRODUCING 1 1/2 INCH DIAMETER HAIL.

A TORNADO WATCH IS ALSO IN EFFECT.  SEVERE THUNDERSTORMS CAN PRODUCE
TORNADOES. THIS IS A DANGEROUS STORM.  DO NOT GO OUTDOORS.

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, 5 hours 40 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
Special weather statement, Jun 18, 3:40 PM MDT, 5 minutes before
WYZ060-068>070-NEZ001>003-019>021-054-055-190300-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
340 PM MDT WED JUN 18 1997

A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR THE NEBRASKA
PANHANDLE AND PARTS OF SOUTHEAST WYOMING AND IS VALID UNTIL 9 PM.

COUNTIES IN THE PANHANDLE INCLUDE SIOUX...DAWES...BOX BUTTE...MORRILL
...CHEYENNE...SCOTTS BLUFF...BANNER AND KIMBALL.  SOME CITIES INCLUDED
IN THE PANHANDLE ARE HARRISON...CHADRON...ALLIANCE...BRIDGEPORT...
SIDNEY...KIMBALL...AND SCOTTSBLUFF/GERING.

COUNTIES IN WYOMING INCLUDED IN THE WATCH ARE GOSHEN...SOUTHERN
NIOBRARA AND CENTRAL AND EASTERN LARAMIE COUNTY.  SOME CITIES INCLUDED
IN SOUTHEAST WYOMING ARE LUSK...TORRINGTON...CHEYENNE AND PINE BLUFFS.

A MOIST AND UNSTABLE AIRMASS IS IN PLACE OVER SOUTHEAST WYOMING AND THE
NEBRASKA PANHANDLE.  AN UPPER LEVEL DISTURBANCE MOVING THROUGH THE AREA
THIS AFTERNOON AND EVENING WILL HELP LIFT THIS AIR...PRODUCING STRONG
THUNDERSTORMS.   SOME OF THESE STORMS COULD PRODUCE LARGE HAIL
AND TORNADOES ALONG WITH HEAVY RAIN.  THUNDERSTORMS WILL DIMINISH
LATER THIS EVENING FROM WEST TO EAST AS THE UPPER LEVEL DISTURBANCE
MOVES EAST OF THE AREA.

PEOPLE IN THE WATCH AREA SHOULD BE ALERT TO APPROACHING STORMS AND
BE PREPARED TO SEEK SHELTER.  LISTEN TO NOAA WEATHER RADIO OR YOUR
LOCAL TELEVISION AND RADIO STATIONS AS WELL AS YOUR CABLE TELEVISION
PROVIDER FOR LATER STATEMENTS AND WARNING.

WCJIN-WYNE-WYSE
JMH
Special weather statement, Jun 18, 3:42 PM MDT, 3 minutes before
WYZ060-068>070-NEZ001>003-019>021-054-055-190300-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
340 PM MDT WED JUN 18 1997

A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR THE NEBRASKA
PANHANDLE AND PARTS OF SOUTHEAST WYOMING AND IS VALID UNTIL 9 PM.

COUNTIES IN THE PANHANDLE INCLUDE SIOUX...DAWES...BOX BUTTE...MORRILL
...CHEYENNE...SCOTTS BLUFF...BANNER AND KIMBALL.  SOME CITIES INCLUDED
IN THE PANHANDLE ARE HARRISON...CHADRON...ALLIANCE...BRIDGEPORT...
SIDNEY...KIMBALL...AND SCOTTSBLUFF/GERING.

COUNTIES IN WYOMING INCLUDED IN THE WATCH ARE GOSHEN...SOUTHERN
NIOBRARA AND CENTRAL AND EASTERN LARAMIE COUNTY.  SOME CITIES INCLUDED
IN SOUTHEAST WYOMING ARE LUSK...TORRINGTON...CHEYENNE AND PINE BLUFFS.

A MOIST AND UNSTABLE AIRMASS IS IN PLACE OVER SOUTHEAST WYOMING AND THE
NEBRASKA PANHANDLE.  AN UPPER LEVEL DISTURBANCE MOVING THROUGH THE AREA
THIS AFTERNOON AND EVENING WILL HELP LIFT THIS AIR...PRODUCING STRONG
THUNDERSTORMS.   SOME OF THESE STORMS COULD PRODUCE LARGE HAIL
AND TORNADOES ALONG WITH HEAVY RAIN.  THUNDERSTORMS WILL DIMINISH
LATER THIS EVENING FROM WEST TO EAST AS THE UPPER LEVEL DISTURBANCE
MOVES EAST OF THE AREA.

PEOPLE IN THE WATCH AREA SHOULD BE ALERT TO APPROACHING STORMS AND
BE PREPARED TO SEEK SHELTER.  LISTEN TO NOAA WEATHER RADIO OR YOUR
LOCAL TELEVISION AND RADIO STATIONS AS WELL AS YOUR CABLE TELEVISION
PROVIDER FOR LATER STATEMENTS AND WARNING.

WCJIN-WYNE-WYSE
JMH
Special weather statement, Jun 18, 3:44 PM MDT, 1 minute before
WYZ060-068>070-NEZ001>003-019>021-054-055-190300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
340 PM MDT WED JUN 18 1997

A TORNADO WATCH HAS BEEN ISSUED FOR THE NEBRASKA PANHANDLE AND PARTS
OF SOUTHEAST WYOMING AND IS VALID UNTIL 9 PM.

COUNTIES IN THE PANHANDLE INCLUDE SIOUX...DAWES...BOX BUTTE...MORRILL
...CHEYENNE...SCOTTS BLUFF...BANNER AND KIMBALL.  SOME CITIES INCLUDED
IN THE PANHANDLE ARE HARRISON...CHADRON...ALLIANCE...BRIDGEPORT...
SIDNEY...KIMBALL...AND SCOTTSBLUFF/GERING.

COUNTIES IN WYOMING INCLUDED IN THE WATCH ARE GOSHEN...SOUTHERN
NIOBRARA AND CENTRAL AND EASTERN LARAMIE COUNTY.  SOME CITIES INCLUDED
IN SOUTHEAST WYOMING ARE LUSK...TORRINGTON...CHEYENNE AND PINE BLUFFS.

A MOIST AND UNSTABLE AIRMASS IS IN PLACE OVER SOUTHEAST WYOMING AND THE
NEBRASKA PANHANDLE.  AN UPPER LEVEL DISTURBANCE MOVING THROUGH THE AREA
THIS AFTERNOON AND EVENING WILL HELP LIFT THIS AIR...PRODUCING STRONG
THUNDERSTORMS.   SOME OF THESE STORMS COULD PRODUCE LARGE HAIL
AND TORNADOES ALONG WITH HEAVY RAIN.  THUNDERSTORMS WILL DIMINISH
LATER THIS EVENING FROM WEST TO EAST AS THE UPPER LEVEL DISTURBANCE
MOVES EAST OF THE AREA.

PEOPLE IN THE WATCH AREA SHOULD BE ALERT TO APPROACHING STORMS AND
BE PREPARED TO SEEK SHELTER.  LISTEN TO NOAA WEATHER RADIO OR YOUR
LOCAL TELEVISION AND RADIO STATIONS AS WELL AS YOUR CABLE TELEVISION
PROVIDER FOR LATER STATEMENTS AND WARNING.

WCJIN-WYNE-WYSE
JMH

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, 2:59 PM MDTSevere Thunderstorm WarningCYSLaramie46 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.