Alert archive / Utah / Flash Flood Warnings in 1994

Flash Flood Warning 8, NWS Salt Lake City, UT

August 11, 1994Garfield County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Aug 11, 1994, 3:55 PM MDT for Garfield County, Utah. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
Aug 11, 1994, 3:55 PM MDT (21:55 UTC)
Expired
Aug 11, 1994, 6:00 PM MDT
In force
2 hr
Issued by
NWS Salt Lake City, UT
Area
Whole counties

County Garfield County, UT

The nearest sounding before it

Grand Junction, CO (KGJT), launched 12:00Z, 9.9 hours before the alert went out and 293 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 1994-08-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 15 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, Grand Junction, CO at 12:00Z on 1994-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 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
15 J/kg
Mixed-layer CIN
-264 J/kg
Mixed-layer LCL
2207 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
117 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 112155
FFWSLC
UTC055-031-017-112300-

BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
355 PM MDT THU AUG 11 1994

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  600 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...

IN SOUTHERN UTAH

   ...SEVIER...WAYNE...GARFIELD

VERY HEAVY RAINFALL HAS BEEN REPORTED FROM THE TOWN OF SEVIER IN SEVIER COUNTY
AND HANKSVILLE IN WAYNE COUNTY. FLOODING WAS REPORTED OVER SECTIONS OF HIGHWAY
89 IN SEVIER COUNTY. THE STORMS ARE MOVING TO THE EAST AT 10-15 MPH.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT.  MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILE$S.  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.

DUNN..2155Z

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 10, 6:10 PM MDTSevere Thunderstorm WarningSLCBox Elder, Tooele65 min
Aug 10, 6:12 PM MDTFlash Flood WarningSLCDavis, Morgan, Salt Lake2 hr
Aug 10, 6:12 PM MDTFlash Flood WarningSLCSummit2 hr
Aug 11, 3:55 PM MDTFlash Flood WarningSLCSevier, Wayne2 hr

Nearby

Flash Flood Warnings in Utah, 1994Every flash flood warning in 1994

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.