Alert archive / Utah / Flash Flood Warnings in 1998

Flash Flood Warning 41, NWS Salt Lake City, UT

August 22, 1998Duchesne County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Aug 22, 1998, 1:30 PM MDT for Duchesne County, Utah. It was in force for 60 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 22, 1998, 1:30 PM MDT (19:30 UTC)
Expired
Aug 22, 1998, 2:30 PM MDT
In force
60 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties

County Duchesne County, UT

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 12:00Z, 7.5 hours before the alert went out and 136 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 1998-08-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 66 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 1998-08-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 202 square meters per square second.1939587897Sfc1 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
66 J/kg
Mixed-layer CIN
-285 J/kg
Mixed-layer LCL
2651 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
202 m²/s²
0-3 km storm-relative helicity
205 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 221937
FFWSLC
UTC013-222000-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
130 PM MDT SAT AUG 22 1998

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

   * FLASH FLOOD WARNING FOR...
     SOUTHEASTERN DUCHESNE COUNTY IN UTAH

   * UNTIL 230 PM MDT

   * AT 130 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
A SEVERE THUNDERSTORM OVER SOUTHEASTERN DUCHESNE COUNTY...OR ABOUT  
15 MILES SOUTH OF MYTON...MOVING EAST AT 20 MILES PER HOUR.

THIS STORM HAS PRODUCED FLASH FLOODING...WASHING OUT THE 
ANTELOPE CANYON ROAD SOUTHEAST OF DUCHESNE.

ADDITIONAL FLASH FLOODING IS LIKELY FROM THIS STORM.

DO NOT DRIVE ACROSS FLOODED ROADWAtYS AS MOST FLASH FLOOD DEATHS 
OCCUR IN AUTOMOBILES..

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 21, 6:12 PM MDTFlash Flood WarningSLCEmery78 min
Aug 21, 8:39 PM MDTFlash Flood WarningSLCSan Juan66 min
Aug 21, 9:48 PM MDTFlash Flood WarningSLCSan Juan57 min
Aug 22, 1:23 PM MDTSevere Thunderstorm WarningSLCDuchesne37 min

Nearby

Flash Flood Warnings in Utah, 1998Every flash flood warning in 1998

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.