Alert archive / Utah / Flash Flood Warnings in 1990

Flash Flood Warning 7, NWS Salt Lake City, UT

September 4, 1990Morgan County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Sep 4, 1990, 5:46 PM MDT for Morgan County, Utah. It was in force for 59 min.

The area

The counties it named.

The facts

Issued
Sep 4, 1990, 5:46 PM MDT (23:46 UTC)
Expired
Sep 4, 1990, 6:45 PM MDT
In force
59 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties

County Morgan 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

Salt Lake City I, UT (KSLC), launched 12:00Z, 11.8 hours before the alert went out and 44 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, Salt Lake City I, UT at 12:00Z on 1990-09-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 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, Salt Lake City I, UT at 12:00Z on 1990-09-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 10 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1847 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
10 m²/s²
0-3 km storm-relative helicity
32 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 042348
FFWSLC
UTC029-050045-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
546 PM MDT TUE SEP 4 1990
 
THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL 645 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION......
 
IN NORTH CENTRAL UTAH
 
   ...MORGAN COUNTY
 
THE MORGAN COUNTY SHERIFFS OFFICE REPORTS FLOODING IN THE CITY OF
MORGAN. WEATHER SPOTTERS IN MORGAN CITY REPORT 1.25 INCHES OF RAIN IN
THE LAST HALF HOUR.
 
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.

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 3, 7:01 PM MDTFlash Flood WarningSLCIron, Washington71 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.