Alert archive / Wyoming / Flash Flood Warnings in 1986

Flash Flood Warning 2, NWS Cheyenne, WY

June 10, 1986Platte County, Wyoming

NWS Cheyenne, WY issued this flash flood warning at Jun 10, 1986, 11:00 AM MDT for Platte County, Wyoming. It was in force for 20 hr.

The area

The counties it named.

The facts

Issued
Jun 10, 1986, 11:00 AM MDT (17:00 UTC)
Expired
Jun 11, 1986, 7:00 AM MDT
In force
20 hr
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.

The nearest sounding before it

Rapid City, SD (KRAP), launched 12:00Z, 5.0 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.

Skew-T log-pSkew-T log-p diagram, Rapid City, SD at 12:00Z on 1986-06-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 33 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Rapid City, SD at 12:00Z on 1986-06-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 21 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
33 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
523 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
21 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

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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

Special weather statement, Jun 10, 6:20 AM MDT, 4 hours 40 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
620 AM MDT TUE JUN 10 1986

THE NORMALLY SEMIARID NEBRASKA PANHANDLE HAS BECOME A SEA OF WATER
IN MINATURE.

HEAVY RAINFALLS HAVE BEEN COMMON FOR MANY PARTS OF THE NEBRASKA
PANHANDLE. THE TWO DAY RAINFALLS THROUGH 5 AM MDT THIS MORNING RANGED
FROM AROUND TWO AND A HALF INCHES IN KIMBALL TO OVER FOUR INCHES AT
CRAWFORD OR 25 MILES WEST OF CHADRON.

IN ADDITION...RAIN CONTINUED OVER MOST OF THE NEBRASKA PANHANDLE WITH
LARGE PATCHES OF MODERATE RAINS AND ISOLATED HEAVY RAINS THIS MORNING.

TO MAKE MATTERS WORSE...MANY PARTS OF EASTERN WYOMING HAVE ALSO
RECEIVED HEAVY RAINS THAT CONTINUED THIS MORNING. THIS RAIN WILL MOVE
DOWN NORMALLY DRY WASHES CREEKBEDS INTO THE NEBRASKA PANHANDLE TO ADD
TO THE PROBLEMS.
<
WHILE NO SERIOUS FLASH FLOOD PROBLEMS HAVE BEEN REPORTED...MANY
FIELDS ARE FLOODED, NORMALLY DRY WASHES HAVE RUNNING WATER, THE
SMALL CREEKS AND RIVERS CONTINUE TO RISE AND THE NORTH PLATTE
RIVER HAS RISEN SHARPLY THROUGH THIS MORNING. ALSO...MANY ROADS
HAVE STANDING WATER AND SOME HAVE SOME RUNNING WATER. MANY
COUNTY ROADS ARE A MESS WITH THE WATER AND MUD COMBINED.

THE HARDIEST HIT COUNTIES HAVE BEEN CHEYENNE, KIMBALL, BANNER,
SCOTTS BLUFF, MORRILL, GARDEN, SIOUX AND WEST DAWES.

PEOPLE ARE URGED TO AVOID LOW AREAS, NORMALLY DRY WASHES AND
CREEKS, AND THE LOWLAND AREAS NEAR THE NORTH PLATTE RIVER TODAY.

ALSO...MOTORIST ARE URGED TO USE CAUTION AND STAY ON PAVED
HIGHWAYS. IF YOU ARE NOT FAMILIAR OR USED TO DRIVING ON THE DIRT
ROADS, PLEASE STAY OFF THEM. WITH THE MUD AND WATER ON THESE DIRT
ROADS, YOU COULD BECOME STUCK OR EVEN WORSE, LOSE CONTROL OF YOUR
VEHICLE AND HAVE A SERIOUS ACCIDENT. IT IS NOT A GOOD DAY TO GO
SIGHTSEEING ON THE BACK ROADS OF THE NEBRASKA PANHANDLE.
MOTORISTS SHOULD ALSO BE ON THE LOOKOUT FOR STANDING OR RUNNING
WATER ESPECIALLY IN LOW AREAS AND UNDERPASSES.

THE CAUSE FOR ALL THE RAIN WAS LOW PRESSURE SYSTEM CENTERED IN
SOUTHWEST NEBRASKA. THIS SYSTEM WILL FINALLY BE MOVING OFF TO THE
EAST TODAY AND THE HEAVIER RAINFALLS SHOULD TAPER AROUND NOON
TODAY.

AGAIN...PLEASE USE CAUTION NEAR WASHES, CREEKS, RIVERS, LOW AREAS
AND AVOID THE DIRT ROADS IN THE NEBRASKA PANHANDLE IF AT ALL
POSSIBLE.
KARR

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 10, 3:00 AM MDTFlash Flood WarningCYSLaramie4 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.