Alert archive / Utah / Flash Flood Warnings in 1992

Flash Flood Warning 4, NWS Salt Lake City, UT

May 25, 1992San Juan County, Utah

NWS Salt Lake City, UT issued this flash flood warning at May 25, 1992, 5:56 PM MDT for San Juan County, Utah. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued: May 25, 1992, 5:56 PM MDT (23:56 UTC)
Expired: May 25, 1992, 8:00 PM MDT
In force: 2 hr
Issued by: NWS Salt Lake City, UT
Area: Whole counties

County San Juan County, UT

The nearest sounding before it

Grand Junction, CO (KGJT), launched 12:00Z, 11.9 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 5 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 918 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 50 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 252357
FFWSLC
UTC037-260200-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
556 PM MDT MON MAY 25 1992
 
THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  800 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION......
 
IN SOUTHEAST UTAH
 
   ...SOUTHERN SAN JUAN COUNTY
 
THE FLASH FLOOD WARNING FOR SOUTHERN SAN JUAN COUNTY HAS BEEN EXTENDED
UNTIL 8OO PM THIS EVENING.
 
HEAVY RAIN IS STILL BEING REPORTED IN PARTS OF THE WARNING AREA.
NATURAL BRIDGES NATIONAL MONUMENT HAS HAD ANOTHER HALF INCH OF RAIN IN
THE 30 MINUTES ENDING AT ABOUT 545 PM.
 
THE KANE GULCH RANGER STATION REPORTS ROUTE 261 IS WASHED OUT AT
MILEPOST 17...A FEW MILES NORTH OF MEXICAN HAT.
 
ADDITIONAL THUNDERSTORMS ARE MOVING ACROSS THE COLORADO BORDER INTO
THE WARNING AREA AND WILL LIKELY CAUSE MORE HEAVY RAINFALL IN THE NEXT
COUPLE OF HOURS.
 
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.

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, May 25, 2:47 PM MDT, 3 hours 9 minutes before

UTZALL-260100-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
230 PM MDT MON MAY 25 1992

      ...THUNDERSTORMS OVER THE UTAH MOUNTAINS...

A LARGE AREA OF THUNDERSTORMS HAS DEVELOPED THIS AFTERNOON ALONG THE
MOUNTAINS IN CENTRAL AND SOUTHERN UTAH.  AT 2 PM THE MOST ACTIVE AREA
EXTENDED FROM NEAR PRICE SOUTHWEST TO NEAR ZION NATIONAL PARK.  A FEW
THUNDERSTORMS WERE ALSO NOTED IN SOUTHEASTERN UTAH AND ALONG THE
UTAH-NEVADA BORDER WEST OF CEDAR CITY.

THE THUNDERSTORMS ARE PRODUCING FREQUENT CLOUD TO GROUND LIGHTNING
AND BRIEF HEAVY SHOWERS.  ONE REPORT IN THE BOULDER AREA INDICATED
1/4 INCH OF RAIN IN 20 MINUTES.  ANOTHER REPORT FROM HENRIEVILLE
INDICATED HEAVY SHOWERS TO THE NORTH BUT NOTHING YET IN TOWN.

THE THUNDERSTORMS WILL BE MOVING TOWARD THE SOUTH OR SOUTHWEST AT
ABOUT 10-15 MPH.
SOME MINOR FLOODING OF NORMALLY DRY WASHES OR SMALL STREAMS IS
POSSIBLE THIS AFTERNOON.  CAMPERS AND HIKERS SHOULD AVOID ANY NARROW
STEEP-WALLED CANYONS.  IN ADDITION...ANYONE OUTDOORS SHOULD TAKE
COVER AS THE THUNDERSTORMS APPROACH.  LIGHTNING IS A PROVEN KILLER
AND COULD QUICKLY TURN A HOLIDAY OUTING INTO A TRAGEDY.

THE THUNDERSTORMS WILL WEAKEN RAPIDLY THIS EVENINGu AND SHOULD END IN
MOST AREAS BY SHORTLY AFTER SUNSET.

ADDITIONAL STATEMENTS WILL BE ISSUED AS NEEDED.

DRS...2045Z

The office that day

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

Issued	Product	Office	Counties	Lasted
May 25, 2:53 PM MDT	Flash Flood Warning	SLC	San Juan	3 hr
May 25, 4:22 PM MDT	Flash Flood Warning	SLC	San Juan	98 min
May 25, 4:24 PM MDT	Flash Flood Warning	SLC	Washington	66 min
May 25, 4:24 PM MDT	Severe Thunderstorm Warning	SLC	Washington	66 min
May 25, 5:11 PM MDT	Severe Thunderstorm Warning	SLC	Wayne	64 min
May 25, 5:15 PM MDT	Severe Thunderstorm Warning	SLC	Emery, Sevier	60 min
May 25, 5:30 PM MDT	Severe Thunderstorm Warning	SLC	Washington	60 min

Nearby

Flash Flood Warnings in Utah, 1992 Every flash flood warning in 1992

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.