Alert archive / Utah / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 74, NWS Salt Lake City, UT

August 12, 1997Garfield County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Aug 12, 1997, 3:59 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 12, 1997, 3:59 PM MDT (21:59 UTC)
Expired
Aug 12, 1997, 4:45 PM MDT
In force
46 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties

County Garfield County, UT

The nearest sounding before it

Grand Junction, CO (KGJT), launched 12:00Z, 10.0 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 1997-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 8 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 1997-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 77 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
8 J/kg
Mixed-layer CIN
-269 J/kg
Mixed-layer LCL
1458 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
77 m²/s²
0-3 km storm-relative helicity
106 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 122201 RRA
SVRSLC
UTC017-122245-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
359 PM MDT TUE AUG 12 1997

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY UT HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 445 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN SOUTH CENTRAL UTAH

   ...NORTH CENTRAL GARFIELD COUNTY
 
AT 355 PM MDT...A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
RADAR 13 MILES NORTHEAST OF ESCALANTE OR 1 MILE WEST OF
BOULDER MOVING NORTH AT 15 MPH.  A SECOND THUNDERSTORM CENTER IS
LOCATED 10 MILES NORTHWEST OF ESCALANTE MOVING THE SAME DIRECTION
AND SPEED.

THESE STORMS ARE EXPECTED TO REMAIN IN RURAL AREAS BUT MAY IMPACT
HIGHWAY 12 IN THE BOULDER MOUNTAIN AREA.
 
PERSONS PLANNING OUTDOOR ACTIVITIES SHOULD BE ALERT FOR STRONG
WINDS...HEAVY SHOWERS...AND HAIL.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 11, 10:48 PM MDTSevere Thunderstorm WarningSLCKane62 min
Aug 12, 1:20 PM MDTSevere Thunderstorm WarningSLCEmery35 min
Aug 12, 3:13 PM MDTSevere Thunderstorm WarningSLCGarfield47 min
Aug 12, 4:48 PM MDTSevere Thunderstorm WarningSLCJuab, Tooele62 min
Aug 12, 5:51 PM MDTSevere Thunderstorm WarningSLCTooele64 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.