Alert archive / Utah / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 70, NWS Salt Lake City, UT

August 11, 1997Garfield County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Aug 11, 1997, 5:59 PM MDT for Garfield County, Utah. It was in force for 46 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 11, 1997, 5:59 PM MDT (23:59 UTC)
Expired
Aug 11, 1997, 6:45 PM MDT
In force
46 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties

County Garfield County, UT

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 11, 1:45 PM MDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Grand Junction, CO (KGJT), launched 12:00Z, 12.0 hours before the alert went out and 293 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 1997-08-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3 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 1997-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 145 square meters per square second.19395878Sfc1 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
3 J/kg
Mixed-layer CIN
-197 J/kg
Mixed-layer LCL
1483 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
145 m²/s²
0-3 km storm-relative helicity
159 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.

440 
WUUS1 KSLC 120004 RRA
SVRSLC
UTC017-120045-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
559 PM MDT MON AUG 11 1997

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY UT HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 645 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN SOUTH CENTRAL UTAH

   ...NORTHWESTERN GARFIELD COUNTY
 
AT 556 PM MDT...A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
RADAR 6 MILES SOUTHEAST OF ANTIMONY MOVING EAST AT 20 MPH.

THIS STORM IS EXPECTED TO REMAIN IN RURAL AREAS

A FLASH FLOOD WARNING IS ALSO IN EFFECT FOR THIS AREA.
 
THESE STORMS MAY PRODUCE STRONG GUSTY WIND...LARGE HAIL...AND
FREQUENT LIGHTNING.  TAKE COVER WHEN THREATENING WEATHER APPROACHES.

HEAVY THUNDERSTORM RAINS CAN QUICKLY FLOOD ROADS.  DO NOT ATTEMPT TO
DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 10, 6:15 PM MDTSevere Thunderstorm WarningSLCBox Elder, Tooele55 min
Aug 10, 7:10 PM MDTSevere Thunderstorm WarningSLCBox Elder, Tooele
Aug 10, 7:10 PM MDTSevere Thunderstorm WarningSLCBox Elder, Tooele60 min
Aug 10, 7:29 PM MDTSevere Thunderstorm WarningSLCBox Elder61 min
Aug 10, 8:15 PM MDTSevere Thunderstorm WarningSLCBox Elder, Davis, Weber75 min
Aug 10, 9:33 PM MDTSevere Thunderstorm WarningSLCDavis, Morgan, Summit, Weber47 min
Aug 10, 10:03 PM MDTSevere Thunderstorm WarningSLCSalt Lake, Utah42 min
Aug 11, 3:34 PM MDTSevere Thunderstorm WarningSLCBox Elder46 min
Aug 11, 3:43 PM MDTFlash Flood WarningSLCGarfield3 hr
Aug 11, 5:59 PM MDTFlash Flood WarningSLCGarfield46 min

Nearby

Severe Thunderstorm Warnings in Utah, 1997Every severe thunderstorm warning in 1997

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.