Alert archive / Utah / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 84, NWS Salt Lake City, UT

August 20, 1997Salt Lake County, Tooele County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Aug 20, 1997, 6:30 PM MDT for Salt Lake County, Tooele County, Utah. It was in force for 30 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Aug 20, 1997, 6:30 PM MDT (00:30 UTC)
Expired
Aug 20, 1997, 7:00 PM MDT
In force
30 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties

Counties Salt Lake County, UT, Tooele County, UT

What was reported inside it

TimeReportWhereRemark
Aug 20, 7:06 PM MDTThunderstorm Wind 59(Slc)Salt Lake City, UT

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 00:00Z, 0.5 hours before the alert went out and 58 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 00:00Z on 1997-08-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 13 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 00:00Z on 1997-08-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 55 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
13 J/kg
Mixed-layer CIN
-144 J/kg
Mixed-layer LCL
3378 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
55 m²/s²
0-3 km storm-relative helicity
82 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 210031
SVRSLC
UTC035-045-210100-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
630 PM MDT WED AUG 20 1997

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY UT HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 700 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...

IN NORTHWESTERN UTAH

   ...SOUTHERN SALT LAKE COUNTY
   ...SOUTHEASTERN TOOELE COUNTY

AT 627 PM MDT...A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
RADAR 29 MILES SOUTHWEST OF SALT LAKE CITY OR 9 MILES SOUTH OF
COPPERFIELD MOVING NORTHEAST AT 25 MPH.  STRONG WINDS TO 60
MPH...HEAVY RAIN AND HAIL WILL ACCOMPANY THIS STORM.
THIS STORM CAN BE EXPECTED IN THE VICINITY OF...
DRAPER                 AT AROUND 640 PM MDT
HERRIMAN               AT AROUND 645 PM MDT

THIS THUNDERSTORM MAY PRODUCE STRONG GUSTY WIND...HAIL...AND
FREQUENT LIGHTNING.  TAKE COVER WHEN THREATENING WEATHER APPROACHES.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 20, 7:12 PM MDTSevere Thunderstorm WarningSLCDavis, Morgan, Salt Lake48 min
Aug 21, 5:15 PM MDTFlash Flood WarningSLCWayne90 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.