Alert archive / Wyoming / Flash Flood Warnings in 1987

Flash Flood Warning 2, NWS Cheyenne, WY

June 8, 1987Big Horn County, Washakie County, Wyoming

NWS Cheyenne, WY issued this flash flood warning at Jun 8, 1987, 9:41 PM MDT for Big Horn County, Washakie County, Wyoming. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Jun 8, 1987, 9:41 PM MDT (03:41 UTC)
Expired
Jun 9, 1987, 1:30 AM MDT
In force
4 hr
Issued by
NWS Cheyenne, WY
Area
Whole counties

Counties Big Horn County, WY, Washakie 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

Lander/Hunt Fiel, WY (KLND), launched 00:00Z, 3.7 hours before the alert went out and 170 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, Lander/Hunt Fiel, WY at 00:00Z on 1987-06-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 292 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lander/Hunt Fiel, WY at 00:00Z on 1987-06-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 8 square meters per square second.193958Sfc1 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
292 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
1240 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
8 m²/s²
0-3 km storm-relative helicity
11 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KCYS 090341
FFWCYS
WYC003-043-090730-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
941 PM MDT MON JUN 8 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING 
EFFECTIVE UNTIL 130 AM MDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF

NORTH CENTRAL WYOMING...SOUTHERN BIG HORN COUNTY AND WASHAKIE COUNTY

THIS FLASH FLOOD WARNING INCLUDES THE FOLLOWING CITIES AND TOWNS...
BASIN...MANDERSON AND WORLAND.   AN INTENSE THUNDERSTORM REMAINED
NEARLY STATIONARY NORTH OF WORLAND FOR SEVERAL HOURS WITH HEAVY
RAINFALL REPORTED TO HAVE CAUSED FLSAH FLOODING ALONG WEST RIVER
ROAD..US 433..AND URBAN FLOODING IN THE NORTHERN END OF WO>RLAND.

PEOPLE IN SOUTHERN BIG HORN COUNTY AND WASHAKIE COUNTY OF
WYOMING SHOULD BE ALERT FOR POSSIBLE FLASH FLOODING AND CLIMB TO
HIGHER GROUND IMMEDIATELY IF THREATENNED BY RISING WATER.
LAUZE

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Local storm report, Jun 8, 4:58 PM MDT, 4 hours 43 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
458 PM MDT MON JUN 8 1987

SELS MKC OMA A BFF

TIME         EVENT
251 PM MDT   FUNNEL CLOUD REPORTED BY DEUEL COUNTY SHERIFF 7 MILES
             NORTHEAST OF CHAPPELL NEBRASKA...OR 30 MILES EAST OF
             SIDNEY NEBRASKA.
300 PM MDT   TORNADO REPORTED ON THE GROUND BY THE DEUEL COUNTY SHERIFF
             10 MILES NORTHEAST OF CHAPPELL NEBRASKA...OR 34 MILES EAST
             OF SIDNEY NEBRASKA.
HONTON

Nearby

Flash Flood Warnings in Wyoming, 1987Every flash flood 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; the sounding from the Mesonet's radiosonde archive.