Alert archive / Wyoming / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 9, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at May 26, 1987, 2:21 PM MDT for Laramie County, Wyoming. It was in force for 54 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
- May 26, 1987, 2:21 PM MDT (20:21 UTC)
- Expired
- May 26, 1987, 3:15 PM MDT
- In force
- 54 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 26, 2:25 PM MDT | Hail 0.75 | Laramie, 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
Denver, CO (KDEN), launched 12:00Z, 8.4 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
- 10 J/kg
- Mixed-layer CIN
- -187 J/kg
- Mixed-layer LCL
- 1049 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- -82 m²/s²
- 0-3 km storm-relative helicity
- 2 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KCYS 262021 SVRCYS WYC021-262115- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 221 PM MDT TUE MAY 26 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 315 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTY OF SOUTHEAST WYOMING...LARAMIE COUNTY THIS INCLUDES THE CITY OF CHEYENNE WYOMING...AT 215 PM MDT RADAR INDICATED A SEVERE THUNDERSTORM IN THE SOUTH PART OF THE CITY OF CHEYENNE MOVING TO THE NORTH AT 15 MILES AN HOUR. THREE QUARTER INCH HAIL WAS REPORTED WITH THIS STORM. THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD PREPARE FOR DAMAGING WIND IN EXCESS OF 60 MPH...LARGE HAIL...AN*D DEADLY LIGHTNING. BOATERS SHOULD MOVE OFF LAKES TO NEARBY SHELTER. PEOPLE OUTDOORS SHOULD MOVE INSIDE STRONG BUILDINGS. STAY AWAY FROM WINDOWS.
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, May 26, 1:07 PM MDT, 1 hour 14 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 105 PM MDT TUE MAY 26 1987 A LINE OF STRONG THUNDERSTORMS EXTENDED FROM SOUTH OF CASPER WYOMING... SOUTHEAST TO LARAMIE AND THEN DOWN ALONG THE FRONT RANGE IN COLORADO AT 1 PM. ANOTHER STRONG THUNDERSTORM WAS OCCURRING JUST SOUTH OF CHEYENNE. ALL OF THE THUNDERSTORMS WERE MOVING NORTH AT 15 MILES AN HOUR. PEOPLE IN SOUTHEAST WYOMING SHOULD BE PREPARED FOR BRIEF HEAVY RAIN... SMALL HAIL AND GUSTY WINDS WITH THE THUNDERSTORMS. IF THREATENING WEATHER APPROACHES...BE READY TO SEEK SHELTER IMMEDIATELY. HATTEN
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 26, 3:18 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 57 min |
| May 26, 4:23 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Platte | 62 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 1987Every severe thunderstorm warning 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.