Alert archive / Wyoming / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 79, NWS Cheyenne, WY

July 10, 1997Platte County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 10, 1997, 12:34 PM MDT for Platte 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
Jul 10, 1997, 12:34 PM MDT (18:34 UTC)
Expired
Jul 10, 1997, 1:20 PM MDT
In force
46 min
Issued by
NWS Cheyenne, WY
Area
Whole counties

County Platte County, WY

The radar

The Cheyenne radar (KCYS), 110 km from the middle of the area, began a volume at 18:34 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

Rapid City, SD (KUNR), launched 12:00Z, 6.6 hours before the alert went out and 274 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 1997-07-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 779 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 1997-07-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 147 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
779 J/kg
Mixed-layer CIN
-487 J/kg
Mixed-layer LCL
1898 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
147 m²/s²
0-3 km storm-relative helicity
151 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.

535 
WUUS1 KCYS 101833 RRA
SVRCYS
WYC031-101920-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
1234 PM MDT THU JUL 10 1997

* SEVERE THUNDERSTORM WARNING FOR
  CENTRAL PLATTE COUNTY IN SOUTHEASTERN WYOMING

* UNTIL 120 PM MDT

* SOME LOCATIONS AFFECTED
  I-25 AT BORDEAUX ROAD                BY 1259 PM MDT
  INTERSECTION OF I-25 AND U.S.34      BY 103 PM MDT
  WHEATLAND                            BY 116 PM MDT

* AT 1231 PM MDT...A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
  RADAR AND SPOTTER REPORTS 12 MILES SOUTHWEST OF WHEATLAND OR 10
  MILES WEST OF INTERSECTION OF I-25 AND U.S.34 MOVING NORTHEAST AT
  15 MPH.
 
AIR FORCE PERSONNEL REPORTED A WIND GUST AROUND 80 MPH JUST SOUTHEAST
OF WHEATLAND.
 
STRONG WINDS WITH THIS STORM MAY CAUSE INJURY OR DAMAGE.  TAKE SHELTER
INSIDE A STURDY BUILDING AWAY FROM ALL DOORS AND WINDOWS.

WCJIN-WYSE
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, Jul 10, 9:59 AM MDT, 2 hours 35 minutes before
WYZ059>070-NEZ001>003-019>021-054-055-110000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1000 AM MDT THU JUL 10 1997

THE SEVERE WEATHER POTENTIAL IN THE CHEYENNE NWS COUNTY WARNING AREA
IS LOW THIS AFTERNOON AND EVENING.

SPOTTER ACTIVATION WILL NOT BE REQUIRED TODAY.

DISCUSSION....VERY WARM AIR WILL CONTINUE OVER THE AREA TODAY.  THIS
WILL SERVE TO CAP THUNDERSTORM DEVELOPMENT...WITH ONLY ISOLATED STORMS
STORMS EXPECTED LAzTE THIS AFTERNOON AND EVENING.

WCJIN-WYNE-WYSE

JLH
Special weather statement, Jul 10, 10:00 AM MDT, 2 hours 34 minutes before
WYZ059>070-NEZ001>003-019>021-054-055-110000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1000 AM MDT THU JUL 10 1997

THE SEVERE WEATHER POTENTIAL IN THE CHEYENNE NWS COUNTY WARNING AREA
IS LOW THIS AFTERNOON AND EVENING.

SPOTTER ACTIVATION WILL NOT BE REQUIRED TODAY.

DISCUSSION....VERY WARM AIR WILL CONTINUE OVER THE AREA TODAY.  THIS
WILL SERVE TO CAP THUNDERSTORM DEVELOPMENT...WITH ONLY ISOLATED STORMS
STORMS EXPECTED LATE THIS AFTERNOON AND EVENING.

WCJIN-WYNE-WYSE

JLH
Special weather statement, Jul 10, 11:30 AM MDT, 1 hour 4 minutes before
WYZ059>070-NEZ001>003-019>021-054-055-110000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1130 AM MDT THU JUL 10 1997

THE SEVERE WEATHER POTENTIAL IN THE CHEYENNE NWS COUNTY WARNING AREA
IS LOW THIS AFTERNOON AND EVENING.

SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY.

DISCUSSION....A WARM AND SLIGHTLY UNSTABLE AIR MASS WILL BE OVER THE
AREA TODAY.  A WEAK UPPER LEVEL WEATHER DISTURBANCE WILL TRIGGER
WIDELY SCATTERED THUNDERSTORMS.  WHILE NO SEVERE WEATHER IS EXPECTED...
A FEW OF THESE THUNDERSTORMS WILL PRODUCE WIND GUSTS TO 40 MPH.

WCJIN-WYNE-WYSE

JLH
Special weather statement, Jul 10, 11:31 AM MDT, 1 hour 3 minutes before
WYZ059>070-NEZ001>003-019>021-054-055-110000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1130 AM MDT THU JUL 10 1997

THE SEVERE WEATHER POTENTIAL IN THE CHEYENNE NWS COUNTY WARNING AREA
IS LOW THIS AFTERNOON AND EVENING.

SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY.

DISCUSSION....A WARM AND SLIGHTLY UNSTABLE AIR MASS WILL BE OVER THE
AREA TODAY.  A WEAK UPPER LEVEL WEATHER DISTURBANCE WILL TRIGGER
WIDELY SCATTERED THUNDERST0ORMS.  WHILE NO SEVERE WEATHER IS EXPECTED...
A FEW OF THESE THUNDERSTORMS WILL PRODUCE WIND GUSTS TO 40 MPH.

WCJIN-WYNE-WYSE

JLH

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.