Alert archive / Utah / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 33, NWS Salt Lake City, UT

June 11, 1997Box Elder County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Jun 11, 1997, 4:32 PM MDT for Box Elder County, Utah. It was in force for 33 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
Jun 11, 1997, 4:32 PM MDT (22:32 UTC)
Expired
Jun 11, 1997, 5:05 PM MDT
In force
33 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 22:32 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 12:00Z, 10.5 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 12:00Z on 1997-06-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 10 joules per kilogram.LCLLFCEL10008507005003002001001 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 12:00Z on 1997-06-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 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
10 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
1031 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
55 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 112239 RRA
SVRSLC
UTC003-112305-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
432 PM MDT WED JUN 11 1997

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY UT HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 505 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN NORTHWESTERN UTAH

   ...WEST CENTRAL BOX ELDER COUNTY
 
DOPPLER RADAR INDICATES A SEVERE THUNDERSTORM OVER EXTREME WESTERN
BOX ELDER COUNTY.  MOVEMENT IS TO THE NORTH NORTHEAST AT 30 MPH.
THIS STORM IS NEAR THE TOWN OF LUCIN.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND...DESTRUCTIVE
HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 10, 6:16 PM MDTSevere Thunderstorm WarningSLCWeber29 min
Jun 10, 6:41 PM MDTSevere Thunderstorm WarningSLCWeber29 min
Jun 11, 3:53 PM MDTSevere Thunderstorm WarningSLCBox Elder32 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.