Alert archive / Utah / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 100, NWS Salt Lake City, UT

September 6, 1997Box Elder County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Sep 6, 1997, 9:22 PM MDT for Box Elder County, Utah. It was in force for 58 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 6, 1997, 9:22 PM MDT (03:22 UTC)
Expired
Sep 6, 1997, 10:20 PM MDT
In force
58 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, 3.4 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 1997-09-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 604 joules per kilogram.LCLEL10008507005003002001001 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, Elko, NV at 00:00Z on 1997-09-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 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
604 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
2786 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
-5 m²/s²
0-3 km storm-relative helicity
46 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSLC 070324 RRA
SVRSLC
UTC003-070420-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
922 PM MDT SAT SEP 6 1997

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY UT HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1020 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN NORTHWESTERN UTAH

   ...EAST CENTRAL BOX ELDER COUNTY

A SEVERE THUNDERSTORM IS LOCATED JUST NORTH THE GREAT SALT LAKE
OVER PROMONTORY AND THE GOLDEN SPIKE NATIONAL HISTORIC SITE. THIS
STORM IS MOVING EAST AT 25 MPH AND WILL AFFECT THE AREA AROUND
PENROSE AND THATCHER IN 30-45 MINUTES. THIS IS A DANGEROUS STORM.
 
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 5N7 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
Sep 6, 7:15 PM MDTSevere Thunderstorm WarningSLCBox Elder60 min
Sep 6, 8:50 PM MDTFlash Flood WarningSLCGarfield, Kane55 min
Sep 6, 9:58 PM MDTFlash Flood WarningSLCKane2 hr
Sep 6, 10:19 PM MDTSevere Thunderstorm WarningSLCBox Elder, Cache61 min
Sep 7, 2:54 AM MDTSevere Thunderstorm WarningSLCUtah41 min
Sep 7, 5:58 AM MDTSevere Thunderstorm WarningSLCBox Elder, Weber47 min
Sep 7, 7:05 AM MDTSevere Thunderstorm WarningSLCDavis, Morgan30 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.