Alert archive / Wyoming / Flash Flood Warnings in 1989

Flash Flood Warning 2, NWS Riverton, WY

August 6, 1989Park County, Wyoming

NWS Riverton, WY issued this flash flood warning at Aug 6, 1989, 6:56 PM MDT for Park County, Wyoming. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
Aug 6, 1989, 6:56 PM MDT (00:56 UTC)
Expired
Aug 6, 1989, 9:00 PM MDT
In force
2 hr
Issued by
NWS Riverton, WY
Area
Whole counties

County Park 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, 0.9 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, Lander/Hunt Fiel, WY at 00:00Z on 1989-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 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 1989-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -25 square meters per square second.1939Sfc1 km3 km6 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2234 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
-25 m²/s²
0-3 km storm-relative helicity
77 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, Aug 6, 5:37 PM MDT, 1 hour 19 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CASPER WY
537 PM MDT SUN AUG 6 1989

AT 530 PM...A LINE OF THUNDERSTORMS EXTENDED FROM 30 MILES SOUTHWEST
OF DOUGLAS WYOMING TO 20 MILES SOUTHEAST OF LUSK WYOMING. THE
STRONGEST THUNDERSTORM WAS 30 MILES SOUTH OF DOUGLAS. THE STORMS
CONTAIN HEAVY RAIN...SMALL HAIL...AND STRONG WINDS AND WERE MOVING
SOUTHEAST AT 25 MILES AN HOUR.

AROUND 4PM...THE NATIONAL WEATHER SERVICE OFFICE IN CASPER RECEIVED
JUST OVER A HALF INCH OF RAIN FROM A THUNDERSTORM IN ONLY FIFTEEN
MINUTES. AN OBSERVER SOUTHWEST OF CASPER REPORTED HAIL UP TO A QUARTER
OF AN INCH IN DIAMETER.

PEOPLE IN EASTERN WYOMING SHOULD STAY ALERT AND BE ON THE LOOKOUT
FOR THREATENING WEATHER.

RUBIN

Nearby

Flash Flood Warnings in Wyoming, 1989Every flash flood warning in 1989

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.