Alert archive / Utah / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 91, NWS Salt Lake City, UT

September 2, 1997Box Elder County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Sep 2, 1997, 11:23 PM MDT for Box Elder County, Utah. It was in force for 57 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
Sep 2, 1997, 11:23 PM MDT (05:23 UTC)
Expired
Sep 3, 1997, 12:20 AM MDT
In force
57 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties

County Box Elder County, UT

The nearest sounding before it

Elko, NV (KLKN), launched 00:00Z, 5.4 hours before the alert went out and 118 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, Elko, NV at 00:00Z on 1997-09-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 83 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, Elko, NV at 00:00Z on 1997-09-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 18 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
83 J/kg
Mixed-layer CIN
-37 J/kg
Mixed-layer LCL
1929 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
18 m²/s²
0-3 km storm-relative helicity
10 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 030523 RRA
SVRSLC
UTC003-030620-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1123 PM MDT TUE SEP 2 1997

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY UT HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1220 AM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN NORTHWESTERN UTAH

   ...NORTHWESTERN BOX ELDER COUNTY
 
AT 1120 PM MDT DOPPLER RADAR CONTINUED TO TRACK A LARGE
SEVERE THUNDERSTORM OVER NORTHWESTERN BOX ELDER COUNTY.  THIS STORM
IS 50 MILES WIDE AND IS MOVING NORTHEASTWARD AT 35 MPH.  THIS IS A
DANGEROUS STORM BUT SO FAR IT CONTINUES TO REMAIN OVER RURAL AREAS.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 57n MPH...
DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.


BURCH

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 2, 9:29 PM MDTSevere Thunderstorm WarningSLCBox Elder, Tooele51 min
Sep 2, 10:26 PM MDTSevere Thunderstorm WarningSLCBox Elder59 min
Sep 3, 12:24 AM MDTSevere Thunderstorm WarningSLCBox Elder61 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.