Alert archive / Utah / Flash Flood Warnings in 1986

Flash Flood Warning 13, NWS Salt Lake City, UT

September 9, 1986San Juan County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Sep 9, 1986, 3:55 PM MDT for San Juan County, Utah. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
Sep 9, 1986, 3:55 PM MDT (21:55 UTC)
Expired
Sep 9, 1986, 6:00 PM MDT
In force
2 hr
Issued by
NWS Salt Lake City, UT
Area
Whole counties

County San Juan 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

Grand Junction, CO (KGJT), launched 12:00Z, 9.9 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, Grand Junction, CO at 12:00Z on 1986-09-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Grand Junction, CO at 12:00Z on 1986-09-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -25 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1560 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
-25 m²/s²
0-3 km storm-relative helicity
35 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 
TTAAOO KSLC 092155
FFWSLC
UTC037-100200-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
355 PM MDT TUE SEP  9 1986
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL  600 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTIES:
 
IN SOUTHEAST UTAH
          ..SOUTHEASTERN SAN JUAN

THIS WARNING INCLUDES THE TOWN OF ANETH..UTAH AND MC ELMO CREEK
BETWEEN THE UTAH BORDER AND THE SAN JUAN RIVER. FLASH FLOODING HAS
BEEN REPORTED ALONG MC ELMO CREEK IN EXTREME SOUTHWEST COLORADO WEST
OF CORTEZ SHORTLY BEFORE 330 PM MDT.
 
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.
 
MOST DEATHS IN FLASH FLOODING 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.

The office that day

Everything else NWS Salt Lake City, UT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 9, 10:59 AM MDTSevere Thunderstorm WarningSLCBox Elder, Weber2 hr
Sep 9, 10:59 AM MDTSevere Thunderstorm WarningSLCDavis, Salt Lake, Tooele2 hr
Sep 9, 12:05 PM MDTTornado WarningSLCDavis, Weber55 min

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.