Alert archive / Utah / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 103, NWS Salt Lake City, UT

September 7, 1997Box Elder County, Weber County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Sep 7, 1997, 5:58 AM MDT for Box Elder County, Weber County, Utah. It was in force for 47 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 7, 1997, 5:58 AM MDT (11:58 UTC)
Expired
Sep 7, 1997, 6:45 AM MDT
In force
47 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties

Counties Box Elder County, UT, Weber County, UT

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 00:00Z, 12.0 hours before the alert went out and 85 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, Salt Lake City I, UT at 00:00Z on 1997-09-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 755 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, Salt Lake City I, UT at 00:00Z on 1997-09-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -1 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
755 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
2480 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
-1 m²/s²
0-3 km storm-relative helicity
99 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

Open this sounding in Storm Lab

The text

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

371 
WUUS1 KSLC 071159 RRA
SVRSLC
UTC003-057-071245-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
558 AM MDT SUN SEP 7 1997

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY UT HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 645 AM MDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...

IN NORTHWESTERN UTAH

   ...EXTREME SOUTHEASTERN BOX ELDER COUNTY
   ...WESTERN WEBER COUNTY
 
AT 554 AM MDT...A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
RADAR IN THE VICINITY OF OGDEN MOVING EAST AT 20 MPH.

THIS STORM CAN BE EXPECTED IN THE VICINITY OF...
HERMITAGE              AT AROUND 600 AM MDT
LIBERTY                AT AROUND 605 AM MDT
HUNTSVILLE             AT AROUND 620 AM MDT
 
THIS STORM MAY PRODUCE LARGE HAIL...STRONG WINDS...LOCAL HEAVY
RAIN AND FREQUENT LIGHTNING.  THIS IS A DANGEROUS STORM.  IF
THREATENING WEATHER APPROACHES TAKE COVER INDOORS.

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, 9:22 PM MDTSevere Thunderstorm WarningSLCBox Elder58 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, 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.