Alert archive / Wyoming / Tornado Warnings in 1998

Tornado Warning 12, NWS Cheyenne, WY

June 13, 1998Laramie County, Wyoming

NWS Cheyenne, WY issued this tornado warning at Jun 13, 1998, 1:17 PM MDT for Laramie County, Wyoming. It was in force for 33 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 13, 1998, 1:17 PM MDT (19:17 UTC)
Expired
Jun 13, 1998, 1:50 PM MDT
In force
33 min
Issued by
NWS Cheyenne, WY
Area
Whole counties

County Laramie County, WY

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 7.3 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 1998-06-13Temperature 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°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 1998-06-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 square meters per square second.1939587897117Sfc1 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
2464 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
85 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 131915 RRA
TORCYS
WYC021-131950-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
117 PM MDT SAT JUN 13 1998

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTH CENTRAL LARAMIE COUNTY IN SOUTHEASTERN WYOMING

* UNTIL 150 PM MDT

* AT 113 PM MDT... SPOTTERS INDICATED A FUNNEL CLOUD OVER
CHEYENNE...MOVING NORTHEAST AT 15 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
  CHEYENNE NOW

GO TO THE BASEMENT OR A SMALL INTERIOR ROOM ON THE LOWEST FLOOR!

WCJIN-WYSE

JMR

What forecasters said that day

The local office's own words before this tornado 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 13, 9:50 AM MDT, 3 hours 27 minutes before
WYZ061>070-NEZ001>003-019>021-054-055-140000-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
950 AM MDT SAT JUN 13 1998

THE RISK OF SEVERE WEATHER OVER SOUTHEAST WYOMING IS LOW THIS AFTERNOON
AND HIGH IN THE WESTERN NEBRASKA PANHANDLE.

SPOTTER ACTIVATION WILL LIKELY BE REQUIRED ESPECIALLY FROM CHADRON TO
SIDNEY.

DISCUSSION...THUNDERSTORMS WILL BE NUMEROUS OVER SOUTHEAST WYOMING AND
THE WESTERN NEBRASKA PANHANDLE THIS AFTERNOON.  THE AIRMASS WILL BE
MOIST AND UNSTABLE AHEAD OF AN AREA OF LOW PRESSURE WHICH WILL MOVE
FROM NORTHWEST COLORADO TO NORTHWEST NEBRASKA BY THE EARLY EVENING.
FOR MOST OF SOUTHEAST WYOMING...THE THUNDERSTORMS WILL PRODUCE WIND
GUSTS TO NEAR 60 MPH AND ONLY LIGHT RAIN.  HOWEVER...FROM THE WYOMING
AND NEBRASKA BORDER AND THROUGH THE WESTERN NEBRASKA PANHANDLE...THE
STORMS WILL BE STRONG STARTING EARLY IN THE AFTERNOON.  IN THE AREA
FROM CHADRON TO SIDNEY...LARGE HAIL...STRONG WIND GUSTS ARE A GOOD
POSSIBILITY WITH THE THUNDERSTORMS.

WCJIN-WYSE-WYNE-
WEILAND
Special weather statement, Jun 13, 9:50 AM MDT, 3 hours 27 minutes before
WYZ061>070-NEZ001>003-019>021-054-055-140000-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
950 AM MDT SAT JUN 13 1998

THE RISK OF SEVERE WEATHER OVER SOUTHEAST WYOMING IS LOW THIS AFTERNOON
AND HIGH IN THE WESTERN NEBRASKA PANHANDLE.

SPOTTER ACTIVATION WILL LIKELY BE REQUIRED ESPECIALLY FROM CHADRON TO
SIDNEY.

DISCUSSION...THUNDERSTORMS WILL BE NUMEROUS OVER SOUTHEAST WYOMING AND
THE WESTERN NEBRASKA PANHANDLE THIS AFTERNOON.  THE AIRMASS WILL BE
MOIST AND UNSTABLE AHEAD OF AN AREA OF LOW PRESSURE WHICH WILL MOVE
FROM NORTHWEST COLORADO TO NORTHWEST NEBRASKA BY THE EARLY EVENING.
FOR MOST OF SOUTHEAST WYOMING...THE THUNDERSTORMS WILL PRODUCE WIND
GUSTS TO NEAR 60 MPH AND ONLY LIGHT RAIN.  HOWEVER...FROM THE WYOMING
AND NEBRASKA BORDER AND THROUGH THE WESTERN NEBRASKA PANHANDLE...THE
STORMS WILL BE STRONG STARTING EARLY IN THE AFTERNOON.  IN THE AREA
FROM CHADRON TO SIDNEY...LARGE HAIL...STRONG WIND GUSTS ARE A GOOD
POSSIBILITY WITH THE THUNDERSTORMS.

WCJIN-WYSE-WYNE-
WEILAND

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 13, 2:00 PM MDTSevere Thunderstorm WarningCYSGoshen45 min
Jun 13, 3:00 PM MDTTornado WarningCYSGoshen35 min
Jun 13, 3:32 PM MDTSevere Thunderstorm WarningCYSPlatte48 min

Nearby

Tornado Warnings in Wyoming, 1998Every tornado warning in 1998Tornadoes in 1998

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.