Alert archive / Utah / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 121, NWS Salt Lake City, UT

October 2, 1997Washington County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Oct 2, 1997, 4:56 PM MDT for Washington County, Utah. It was in force for 44 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
Oct 2, 1997, 4:56 PM MDT (22:56 UTC)
Expired
Oct 2, 1997, 5:40 PM MDT
In force
44 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties

County Washington County, UT

The nearest sounding before it

Mercury/Desert R, NV (KDRA), launched 12:00Z, 10.9 hours before the alert went out and 234 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, Mercury/Desert R, NV at 12:00Z on 1997-10-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Mercury/Desert R, NV at 12:00Z on 1997-10-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1979 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
137 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.

050 
WUUS1 KSLC 022258 RRA
SVRSLC
UTC053-022340-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
456 PM MDT THU OCT 2 1997

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY UT HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 540 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN SOUTHWESTERN UTAH

   ...EASTERN WASHINGTON COUNTY
 
AT 452 PM MDT...A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
RADAR 20 MILES EAST OF ST GEORGE OR 17 MILES SOUTHWEST OF ZION
NATIONAL PARK MOVING NORTHEAST AT 30 MPH.

THIS STORM CAN BE EXPECTED IN THE VICINITY OF...
ZION NATIONAL PARK     AT AROUND 525 PM MDT
HURRICANE              AT AROUND 500 PM MDT
LA VERKIN              AT AROUND 505 PM MDT
 
THIS THUNDERSTORM MAY PRODUCE STRONG GUSTY WIND...LARGE 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
Oct 2, 2:45 PM MDTSevere Thunderstorm WarningSLCGarfield60 min
Oct 2, 3:38 PM MDTSevere Thunderstorm WarningSLCKane, Washington62 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.