Alert archive / Wyoming / Flash Flood Warnings in 1986

Flash Flood Warning 1, NWS Cheyenne, WY

June 10, 1986Laramie County, Wyoming

NWS Cheyenne, WY issued this flash flood warning at Jun 10, 1986, 3:00 AM MDT for Laramie County, Wyoming. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Jun 10, 1986, 3:00 AM MDT (09:00 UTC)
Expired
Jun 10, 1986, 7:00 AM MDT
In force
4 hr
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 00:00Z, 9.0 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 00:00Z on 1986-06-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 56 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, Denver, CO at 00:00Z on 1986-06-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -84 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
56 J/kg
Mixed-layer CIN
-35 J/kg
Mixed-layer LCL
1077 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
-84 m²/s²
0-3 km storm-relative helicity
-38 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 100916 COR
FFWCYS
WYC021-101300-

BULLETIN - EBS ACTIVATION REQUESTED...CORRECTION COUNTY CODE
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHEYENNE WYOMING
300 AM MST TUE JUN 10 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL 7 AM MST FOR PEOPLE IN THE FOLLOWING COUNTIES OF
SOUTHEAST WYOMING..LARAMIE

AT 245 AM AN OBSERVER NEAR GRANIT RESERVOIR 24 MILES WEST OF CHEYENNE
REPORTED HEAVY RAINS WITH 2 INCHES MEASURED SINCE MIDNIGHT.  WATER
WAS REPORTED SEEPING INTO THE LABORATORY DOOR.  CRYSTAL LAKE ROAD IS
PROBABLY WASHED OUT  AND FLOODING IS PROBABLE ALONG CROW CREEK DOWN TO
GILCREST SCHOOL.

MODERATE TO OCCASIONAL HEAVY RAINS ARE EXPECTED TO PERSIST IN THE AREA
FOR THE NEXT SEVERAL HOURS WITH ANOTHER TWO INCHES OF RAIN POSSIBLE BY
6 AM THIS TUESDAY MORNING.
<
PEOPLE LIVING ALONG CROW CREEK FROM GRANIT RESERVOIR THROUGH THE CITY
OF CHEYENNE SHOULD PREPARE FOR FLASH FLOODING.  IF YOUR HOME IS CLOSE
TO CROW CREEK AND PRONE TO FLOODING..EVACUATE YOUR HOME AND MOVE TO
HIGHER GROUND.  NEVER ATTEMPT TO DRIVE ACROSS A FLOODED ROAD..AS
SWIFTLY MOVING WATER CAN EASILY SWEEP A VEHICLE OFF THE ROAD AND DOWN
STREAM.
LAUZE

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 10, 11:00 AM MDTFlash Flood WarningCYSPlatte20 hr
Jun 10, 11:30 AM MDTFlash Flood WarningCYSAlbany, Carbon19 hr

Nearby

Flash Flood Warnings in Wyoming, 1986Every flash flood warning in 1986

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.