Alert archive / Utah / Flash Flood Warnings in 1986

Flash Flood Warning 12, NWS Salt Lake City, UT

August 29, 1986Iron County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Aug 29, 1986, 4:15 PM MDT for Iron County, Utah. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Aug 29, 1986, 4:15 PM MDT (22:15 UTC)
Expired
Aug 29, 1986, 7:00 PM MDT
In force
3 hr
Issued by
NWS Salt Lake City, UT
Area
Whole counties

County Iron County, UT

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

Ely/Yelland Fld, NV (KELY), launched 12:00Z, 10.3 hours before the alert went out and 205 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, Ely/Yelland Fld, NV at 12:00Z on 1986-08-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 327 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, Ely/Yelland Fld, NV at 12:00Z on 1986-08-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 11 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
327 J/kg
Mixed-layer CIN
-144 J/kg
Mixed-layer LCL
1592 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
11 m²/s²
0-3 km storm-relative helicity
48 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 KSLC 292237 COR
FFWSLC
UTC021-300215-

BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING...CORRECTION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
415 PM MDT FRI AUG 29 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL  700 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTIES:

IN SOUTHWEST UTAH
          ..SOUTHEASTERN IRON

FLOODING REPORTED BY THE HIGHWAY PATROL ACROSS STATE HIGHWAY 56 AND
ACROSS INTERSTATE 15 APPROXIMATELY 15 MILES SOUTH OF CEDAR CITY.
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY.  THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO
CROSS SAFELY.  VEHICLES CAUGHT IN RISING WATER SHOULD BE
ABANDONED QUICKLY.  MOVE TO HIGHER GROUND.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT.  MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES.  DO NOT
ATTEMPT TO CROSS BRIDGES, DIPS, OR LOW SPOTS IF WATER COVERS THE
ROADWAY.  NEVER TRY TO CROSS A FLOWING STREAM, EVEN A SMALL ONE,
ON FOOT.  TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND.

SEVERAL FEET OF WATER HAS BEEN REPORTED ACROSS PORTIONS OF STATE
HIGHWAY 56 AND INTERSTATE 15 10-15 MILES SOUTH OF CEDAR CITY.
THE FLOODING IS BEING CAUSED BY VERY HEAVY RAINFALL OCCURRING IN
THUNDERSTORMS MOVING ACROSS THE AREA.

END/DUVAL

Nearby

Flash Flood Warnings in Utah, 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.