Alert archive / Wyoming / Flash Flood Warnings in 1986

Flash Flood Warning 2, NWS Rapid City, SD

June 19, 1986Converse County, Natrona County, Wyoming

NWS Rapid City, SD issued this flash flood warning at Jun 19, 1986, 7:25 PM MDT for Converse County, Natrona County, Wyoming. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Jun 19, 1986, 7:25 PM MDT (01:25 UTC)
Expired
Jun 19, 1986, 10:00 PM MDT
In force
3 hr
Issued by
NWS Rapid City, SD
Area
Whole counties

Counties Converse County, WY, Natrona 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, 1.4 hours before the alert went out and 208 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 1986-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 494 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 1986-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 40 square meters per square second.19395878Sfc1 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
494 J/kg
Mixed-layer CIN
-108 J/kg
Mixed-layer LCL
2678 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
89 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.5

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 19, 3:36 PM MDT, 3 hours 49 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RAPID CITY  SD
335 PM MDT THU JUN 19 1986

...THUNDERSTORMS IN SOUTHWEST SOUTH DAKOTA...

AT 330 PM MDT THUNDERSTORMS CONTINUED ALONG THE EAST SLOPES OF THE
BLACK HILLS OF SOUTHWEST SOUTH DAKOTA..FROM JUST NORTH OF RAPID CITY
TO 40 MILES SOUTH OF RAPID CITY..NEAR CUSTER.

NO SEVERE WEATHER HAD BEEN REPORTED FROM THE THUNDERSTORMS..BUT SOME
SMALL HAIL HAD FALLEN NEAR CUSTER AND WINDS GUSTED TO 48 MILES AN
HOUR AT THE RAPID CITY REGIONAL AIRPORT..AT 311 PM MDT.

THE THUNDERSTORMS WILL PRODUCE GUSTY WINDS..DANGEROUS LIGHTNING..
AND SOME HAIL.

ALL PERSONS IN SOUTHWEST SOUTH DAKOTA SHOULD BE ALERT TO CHANGING
WEATHER CONDITIONS AND SEEK SHEcLTER IF THREATENING WEATHER APPROACHES.
DYRDAHL

The office that day

Everything else NWS Rapid City, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 19, 6:30 PM MDTSevere Thunderstorm WarningUNRConverse, Natrona60 min
Jun 19, 7:45 PM MDTSevere Thunderstorm WarningUNRConverse, Natrona45 min

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.