Alert archive / Utah / Flash Flood Warnings in 1990

Flash Flood Warning 3, NWS Salt Lake City, UT

September 2, 1990Grand County, San Juan County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Sep 2, 1990, 4:15 PM MDT for Grand County, San Juan County, Utah. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
Sep 2, 1990, 4:15 PM MDT (22:15 UTC)
Expired
Sep 2, 1990, 6:15 PM MDT
In force
2 hr
Issued by
NWS Salt Lake City, UT
Area
Whole counties

Counties Grand County, UT, 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, 10.3 hours before the alert went out and 138 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 1990-09-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 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 1990-09-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 2 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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1257 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
2 m²/s²
0-3 km storm-relative helicity
219 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 022217
FFWSLC
UTC019-037-030015-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
415 PM MDT SUN SEP 2 1990
 
THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL 615 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN EAST CENTRAL UTAH
 
   ...SOUTHERN GRAND COUNTY
 
IN SOUTHEAST UTAH
 
   ...NORTHERN SAN JUAN COUNTY
 
A WEATHER SPOTTER FROM HOLE-IN-THE-ROCK REPORTED RECEIVING 1.00 INCH
OF RAIN IN LESS THAN 10 MINUTES WITH CONTINUED VERY HEAVY RAIN.
CANYONLANDS NATIONAL PARK RANGERS REPORTED SOME FLOODING IN THE
NEEDLES AREA OF THE PARK WITH CONTINUED VERY HEAVY RAIN.
 
THESE RAINS ARE COMING FROM A BAND OF STRONG THUNDERSTORMS MOVING
SLOWLY NORTHWARD THROUGH UTAH.  VERY HEAVY RAIN AND FLOODING WILL BE
POSSIBLE IN THE WARNING AREA FOR THE NEXT TWO 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.
 
SMITH 2216Z

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 2, 4:49 PM MDTFlash Flood WarningSLCEmery, Grand, San Juan116 min
Sep 2, 4:49 PM MDTFlash Flood WarningSLCCarbon, Uintah116 min

Nearby

Flash Flood Warnings in Utah, 1990Every flash flood warning in 1990

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.