Alert archive / Utah / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 59, NWS Salt Lake City, UT

August 10, 1997Iron County, Washington County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Aug 10, 1997, 5:38 AM MDT for Iron County, Washington County, Utah. It was in force for 42 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 10, 1997, 5:38 AM MDT (11:38 UTC)
Expired
Aug 10, 1997, 6:20 AM MDT
In force
42 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties

Counties Iron County, UT, Washington County, UT

The nearest sounding before it

Mercury/Desert R, NV (KDRA), launched 00:00Z, 11.6 hours before the alert went out and 254 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 00:00Z on 1997-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1466 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 1997-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 9 square meters per square second.193958Sfc1 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
1466 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
2607 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
9 m²/s²
0-3 km storm-relative helicity
45 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.

252 
WUUS1 KSLC 101140 RRA
SVRSLC
UTC021-053-101220-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
538 AM MDT SUN AUG 10 1997

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY UT HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 620 AM MDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...

IN SOUTHWESTERN UTAH

   ...SOUTHEASTERN IRON COUNTY
   ...NORTHEASTERN WASHINGTON COUNTY
 
AT 535 AM MDT...A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
RADAR ALONG I-15 17 MILES SOUTHWEST OF CEDAR CITY OR 10 MILES
SOUTHWEST OF KANARRAVILLE...WITH A SECOND SEVERE STORM JUST TO THE
EAST OF KANARRAVILLE.  MOVEMENT ON THESE STORMS IS TO THE NORTHEAST
AT 20-25 MPH.

THESE STORMS ARE EXPECTED TO MOVE INTO THE MOUNTAINS EAST OF
I-15.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...
DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.  FOR YOUR
PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 9, 6:10 PM MDTFlash Flood WarningSLCSevier110 min
Aug 9, 6:10 PM MDTFlash Flood WarningSLCSevier90 min
Aug 10, 7:28 AM MDTSevere Thunderstorm WarningSLCKane32 min
Aug 10, 5:26 PM MDTSevere Thunderstorm WarningSLCBox Elder, Tooele39 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.