Alert archive / Wyoming / Tornado Warnings in 1987
Tornado Warning 4, NWS Cheyenne, WY
NWS Cheyenne, WY issued this tornado warning at Jun 7, 1987, 7:35 PM MDT for Platte County, Wyoming. It was in force for 55 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jun 7, 1987, 7:35 PM MDT (01:35 UTC)
- Expired
- Jun 7, 1987, 8:30 PM MDT
- In force
- 55 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
County Platte County, WY
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 7, 8:30 PM MDT | Hail 1.75 | Platte, WY |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Rapid City, SD (KRAP), launched 00:00Z, 1.6 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.
- Mixed-layer CAPE
- 651 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 1311 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- -17 m²/s²
- 0-3 km storm-relative helicity
- 98 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.3
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KCYS 080135 TORCYS WYC031-080230- BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 735 PM MDT SUN JUN 7 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING EFFECTIVE UNTIL 830 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTY OF SOUTHEAST WYOMING...SOUTHERN PLATTE COUNTY AT 730 PM THE SHERIFF DEPAETMENT REPORTED A TORNADO 20 MILES SOUTH OF WHEATLAND. THERE WAS NO DIRECTION OF MOVEMENT REPORTED. HOWEVER THE PARENT THUNDERSTORM WAS MOVING TO THE SOUTHEAST AT FIVE MILES AN HOUR. 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. PEOPLE IN THE TOWNS OF SLATER AND CHUGWATER ARE NEXT IN THE PATH OF THIS DANGEROUS STORM.
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 7, 3:11 PM MDT, 4 hours 24 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 300 PM MDT SUN JUN 7 1987 ...STRONG THUNDERSTORMS CONTINUE IN SOUTH ALBANY COUNTY WYOMING... AT 300 PM MDT...A VERY STRONG THUNDERSTORM WAS OVER SOUTH ALBANY COUNTY WYOMING...20 MILES WEST OF LARAMIE. THIS STORM PRODUCED VERY HEAVY RAIN IN ALBANY WYOMING AROUND 230 PM. AT 250 PM...THE ALBANY COUNTY SHERIFF REPORTED PEA SIZE HAIL COVERING HIGHWAY 11 JUST NORTHWEST OF ALBANY. THE STORM WAS MOVING NORTHEAST AT 15 TO 20 MILES AN HOUR. IT WILL LIKELY PASS JUST NORTHWEST OF LARAMIE THE DURING THE NEXT HOUR. ANOTHER STRONG THUNDERSTORM WAS IN NORTH ALBANY COUNTY...45 MILES SOUTHEAST OF CASPER. THUNDERSTORMS WILL CONTINUE OVER SOUTHEAST WYOMING INTO THE EVENING HOURS...DISSIPATING AROUND SUNSET. BRIEF HEAVY RAIN...GUSTY WIND AND SMALL HAIL CAN BE EXPECTED WITH THESE STORMS. JPK
Special weather statement, Jun 7, 6:14 PM MDT, 1 hour 21 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 612 PM MDT SUN JUN 7 1987 ...SEVERE THUNDERSTORM WARNING FOR NORTHWEST ALBANY AND CENTRAL PLATTE COUNTIES UNTIL 630 PM... AT 547 PM A SEVERE THUNDERSTORM WAS LOCATED OVER THE RIDGE OF THE LARAMIE RANGE...25 MILES EAST OF GARRETT OR 40 MILES SOUTHEAST OF DOUGLAS. THIS SEVERE THUNDERSTORM WAS STATIONARY...CREATING THE POTENTIAL FOR FLASH FLOODING. RADAR INDICATED THAT THIS THUNDERSTORM ALSO HAS THE POTENTIAL TO PRODUCE LARGE DAMAGING HAIL. RAIN FROM THIS SEVERE THUNDERSTORM WILL FEED INTO THE NORTH LARAMIE RIVER BASIN. PERSONS IN THE TOWN OF UVA...59 MILES NORTH OF CHEYENNE ...SHOULD BE ON THE WATCH FOR POSSIBLE FLASH FLOODING. LARGE HAIL...VERY HEAVY RAIN AND DAMAGING HAIL ARE POSSIBLE WITH SEVERE THUNDERSTORMS. IF FLASH FLOODING IS OBSERVED...ACT QUICKLY. MOVE TO ESCAPE THE FLOOD WATERS. DO NOT STAY IN AREAS PRONE TO FLOODING IF WATERS START TO RAISE. W IF YOU EXPERIENCE SEVERE WEATHER...REPORT IT TO THE NATIONAL WEATHER SERVICE OR TO THE NEAREST LAW ENFORCEMENT AGENCY AS SOON AS POSSIBLE. ML
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 7, 6:30 PM MDT | Severe Thunderstorm Warning | CYS | Albany, Platte | 60 min |
| Jun 7, 7:25 PM MDT | Severe Thunderstorm Warning | CYS | Platte | 65 min |
| Jun 7, 8:30 PM MDT | Severe Thunderstorm Warning | CYS | Laramie, Platte | 60 min |
| Jun 7, 9:03 PM MDT | Flash Flood Warning | CYS | Platte | 3 hr |
| Jun 7, 9:33 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 57 min |
| Jun 7, 10:04 PM MDT | Tornado Warning | CYS | Goshen | 56 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.