Alert archive / Utah / Flash Flood Warnings in 1991

Flash Flood Warning 3, NWS Salt Lake City, UT

August 2, 1991Grand County, Uintah County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Aug 2, 1991, 4:40 PM MDT for Grand County, Uintah County, Utah. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
Aug 2, 1991, 4:40 PM MDT (22:40 UTC)
Expired
Aug 2, 1991, 7:00 PM MDT
In force
2 hr
Issued by
NWS Salt Lake City, UT
Area
Whole counties

Counties Grand County, UT, Uintah County, UT

The nearest sounding before it

Grand Junction, CO (KGJT), launched 12:00Z, 10.7 hours before the alert went out and 101 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 1991-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 48 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 1991-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -42 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
48 J/kg
Mixed-layer CIN
-232 J/kg
Mixed-layer LCL
1344 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
-42 m²/s²
0-3 km storm-relative helicity
31 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 022240
FFWSLC
UTC019-047-030100-

BULLETIN...IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
440 PM MDT FRI AUG 2 1991

THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE
UNTIL 7 PM TONIGHT FOR THE SOUTHERN HALF OF UINTAH COUNTY AND THE
NORTHERN QUARTER OF GRAND COUNTY.  THESE COUNTIES ARE IN EAST
CENTRAL UTAH.

A FLASH FLOOD WARNING MEANS FLASH FLOODING IS OCCURRING OR IsS IMMINENT.
SATELLITE IMAGERY INDICATES HEAVY RAINFALL IS OCCURRING NORTHWEST
GRAND COUNTY AND MOVING NORTHEASTWARD INTO UINTAH COUNTY.

HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE
WATER IS COVERING THE ROAD.

EC...2237Z

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 1, 10:40 PM MDTFlash Flood WarningSLCSevier80 min

Nearby

Flash Flood Warnings in Utah, 1991Every flash flood warning in 1991

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.