Alert archive / Wyoming / Tornado Warnings in 1987
Tornado Warning 12, NWS Cheyenne, WY
NWS Cheyenne, WY issued this tornado warning at Jun 20, 1987, 2:39 PM MDT for Laramie County, Wyoming. It was in force for 36 min.
The area
The counties it named.
The facts
- Issued
- Jun 20, 1987, 2:39 PM MDT (20:39 UTC)
- Expired
- Jun 20, 1987, 3:15 PM MDT
- In force
- 36 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
County Laramie County, WY
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Denver, CO (KDEN), launched 12:00Z, 8.7 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.
- Mixed-layer CAPE
- 791 J/kg
- Mixed-layer CIN
- -190 J/kg
- Mixed-layer LCL
- 1292 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 52 m²/s²
- 0-3 km storm-relative helicity
- 2 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KCYS 202040 TORCYS WYC021-202145- BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 239 PM MDT SAT JUN 20 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING EFFECTIVE UNTIL 345 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTY OF SOUTHEAST WYOMING...SOUTHEAST LARAMIE COUNTY THIS INCLUDES THE CITIES OF CARPERNTER...EGBERT...PINE BLUFFS AND BURNS. AT 235 PM A TORNADO WAS REPORTED ON THE GROUND 2 MILES EAST OF CARPENTER MOVING EAST. IF YOU ARE IN THE PATH OF THIS TORNADO...THE SAFEST PLACE IS A BASEMENT. GET UNDER A WORKBENCH OR PIECE OF STURDY FURNITURE. IF NO BASEMENT IS AVAILABLE...SEEK SHELTER IN AN INTERIOR ROOM ON THE LOWEST FLOOR. USE BLANKETS OR PILLOWS TO COVER YOUR BODY. DASELER
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 20, 1:53 PM MDT, 46 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 150 PM MDT SAT JUN 20 1987 SOME STRONG THUNDERSTORMS HAVE DEVELOPED IN THE CHEYENNE VICINITY SINCE NOONTIME. RADAR INDICATED A BAND OF THUNDERSTORMS JUST SOUTH OF THE CITY ALONG THE COLORADO BORDER. ANOTHER AREA OF STORMS WAS DEVELOPING JUST A FEW MILES NORTHEAST OF CHEYENNE AT 145 PM...ALL MOVING EAST. NO SEVERE WEATHER HAS BEEN REPORTED FROM THESE STORMS. WITH DRY AIR NEAR THE SURFACE...A LOT OF THE RAIN WAS EVAPORATING BEFORE IT REACHED THE GROUND. THIS HAS RESULTED IN RATHER OMINOUS LOOKING RAIN SHAFTS THAT HAVE A FUNNEL SHAPE. A FEW OF THE STORMS BY LATER THIS AFTERNOON COULD PRODUCE GUSTY WINDS AND POSSIcBLY SOME SMALL HAIL. IF A THREATENING THUNDERSTORM MOVES INTO YOUR AREA...GO TO A SAFE PLACE AND THEN REPORT ANY SIGNIFICANT WEATHER TO THE NATIONAL WEATHER SERVICE OR LAW ENFORCEMENT AGENCIES. DASELER
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 19, 6:15 PM MDT | Tornado Warning | CYS | Crook | 45 min |
| Jun 19, 7:28 PM MDT | Severe Thunderstorm Warning | CYS | Laramie, Platte | 62 min |
Nearby
Tornado Warnings in Wyoming, 1987Every tornado warning in 1987Tornadoes in 1987
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.