Alert archive / Utah / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 71, NWS Salt Lake City, UT

August 11, 1997Kane County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Aug 11, 1997, 10:48 PM MDT for Kane County, Utah. It was in force for 62 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, 10:48 PM MDT (04:48 UTC)
Expired
Aug 11, 1997, 11:50 PM MDT
In force
62 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties

County Kane County, UT

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 4.8 hours before the alert went out and 229 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, Flgstf/Belemont, AZ at 00:00Z on 1997-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 377 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Flgstf/Belemont, AZ at 00:00Z on 1997-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 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
377 J/kg
Mixed-layer CIN
-35 J/kg
Mixed-layer LCL
1525 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
36 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KSLC 120450 RRA
SVRSLC
UTC025-120550-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1048 PM MDT MON AUG 11 1997

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY UT HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1150 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN SOUTH CENTRAL UTAH

   ...EAST CENTRAL KANE COUNTY
 
THIS THUNDERSTORM IS NORTHEAST OF BIG WATER IS IS HEADING INTO THE
RUGGED CANYON COUNTRY JUST NORTH OF LAKE POWELL. LARGE HAIL...HEAVY
RAIN AND WINDS IN EXCESS OF 60 MPH CAN BE EXPECTED WITH THIS STORM.
  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 12, 1:20 PM MDTSevere Thunderstorm WarningSLCEmery35 min
Aug 12, 3:13 PM MDTSevere Thunderstorm WarningSLCGarfield47 min
Aug 12, 3:59 PM MDTSevere Thunderstorm WarningSLCGarfield46 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.