Alert archive / Utah / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 49, NWS Salt Lake City, UT

July 10, 1997Box Elder County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Jul 10, 1997, 3:54 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
Jul 10, 1997, 3:54 PM MDT (21:54 UTC)
Expired
Jul 10, 1997, 4:55 PM 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 21:57 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, 9.9 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 1997-07-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 218 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 1997-07-10The 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
218 J/kg
Mixed-layer CIN
-141 J/kg
Mixed-layer LCL
1723 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
91 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 102158 RRA
SVRSLC
UTC003-102255-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
354 PM MDT THU JUL 10 1997

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY UT HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 455 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN NORTHWESTERN UTAH

   ...WESTERN BOX ELDER COUNTY
 
AT 350 PM MDT DOPPLER RADAR SHOWED SEVERAL SEVERE THUNDERSTORMS IN
WESTERN BOX ELDER COUNTY.  THESE STORMS HAVE THE POTENTIAL TO
PRODUCE HAIL IN EXCESS OF 1 INCH IN DIAMETER...AND WINDS IN EXCESS
OF 60 MPH.

A SPOTTER IN THE TOWN OF YOST UTAH REPORTED ONE INCH DIAMETER HAIL
AT 330 PM MDT FROM AN EARLIER STORM.

&

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.