Alert archive / Utah / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 106, NWS Salt Lake City, UT

September 10, 1997Box Elder County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Sep 10, 1997, 11:14 PM MDT for Box Elder County, Utah. It was in force for 61 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 10, 1997, 11:14 PM MDT (05:14 UTC)
Expired
Sep 11, 1997, 12:15 AM MDT
In force
61 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties

County Box Elder County, UT

The radar

The Salt Lake City radar (KMTX), 60 km from the middle of the area, began a volume at 05:16 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Elko, NV (KLKN), launched 00:00Z, 5.2 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 1997-09-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 352 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 1997-09-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 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
352 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
2712 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
52 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 110513 RRA
SVRSLC
UTC003-110615-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1114 PM MDT WED SEP 10 1997

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY UT HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1215 AM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN NORTHWESTERN UTAH

   ...NORTHEASTERN BOX ELDER COUNTY
 
AT 1108 PM MDT...A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
RADAR 2 MILES SOUTHWEST OF PROMONTORY MOVING NORTHEAST AT 30 MPH.

THIS STORM CAN BE EXPECTED IN THE VICINITY OF...
PROMONTORY             AT AROUND 1115 PM MDT
HOWELL                 AT AROUND 1140 PM MDT
 
THIS THUNDERSTORM MAY PRODUCE STRONG GUSTY W6IND...LARGE HAIL...AND
FREQUENT LIGHTNING.  TAKE COVER WHEN THREATENING WEATHER APPROACHES.

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 10, 6:40 PM MDTFlash Flood WarningSLCGarfield85 min
Sep 11, 12:33 PM MDTFlash Flood WarningSLCKane47 min
Sep 11, 1:22 PM MDTFlash Flood WarningSLCKane58 min
Sep 11, 2:02 PM MDTSevere Thunderstorm WarningSLCBox Elder48 min
Sep 11, 2:38 PM MDTSevere Thunderstorm WarningSLCCache47 min
Sep 11, 3:01 PM MDTSevere Thunderstorm WarningSLCBox Elder49 min
Sep 11, 3:17 PM MDTSevere Thunderstorm WarningSLCKane, San Juan43 min
Sep 11, 3:46 PM MDTSevere Thunderstorm WarningSLCBox Elder44 min
Sep 11, 4:16 PM MDTSevere Thunderstorm WarningSLCCache34 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; radar from the NEXRAD Level II archive.