Alert archive / Utah / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 7, NWS Salt Lake City, UT

May 9, 1998Box Elder County, Tooele County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at May 9, 1998, 7:38 PM MDT for Box Elder County, Tooele County, Utah. It was in force for 37 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued
May 9, 1998, 7:38 PM MDT (01:38 UTC)
Expired
May 9, 1998, 8:15 PM MDT
In force
37 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Box Elder County, UT, Tooele County, UT

The radar

The Salt Lake City radar (KMTX), 103 km from the middle of the area, began a volume at 01:38 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, 1.6 hours before the alert went out and 51 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 1998-05-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 1998-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
625 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
142 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.

088 
WUUS1 KSLC 100145 RRA
SVRSLC
UTC003-045-100215-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
738 PM MDT SAT MAY 9 1998

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

   * SEVERE THUNDERSTORM WARNING FOR...
     SOUTH CENTRAL BOX ELDER COUNTY IN UTAH
     NORTHWESTERN TOOELE COUNTY IN UTAH

   * UNTIL 815 PM MDT

   * AT 737 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
     SEVERE THUNDERSTORM 28 MILES WEST OF KNOLLS...OR ABOUT 11 MILES
     EAST OF WENDOVER...MOVING NORTHEAST AT 20 MILES PER HOUR.

   * SEVERE THUNDERSTORM WILL BE...
     OVER I-80 BETWEEN 740 PM AND 800 PM MDT.

LARGE HAIL AND DAMAGING WINDS CAN BE EXPECTED FROM THIS STORM.  
TRAVELERS ALONG I-80 BETWEEN WENDOVER AND KNOLLS SHOULD BE PREPARED 
FOR STRONG WINDS WHICH MAY MAKE DRIVING HAZARDOUS.

LAT...LON 4075 11394 4055 11364 4070 11322 4143 11321           4141 
11364

The office that day

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

IssuedProductOfficeCountiesLasted
May 9, 6:43 PM MDTSevere Thunderstorm WarningSLCBox Elder, Tooele62 min
May 9, 8:15 PM MDTSevere Thunderstorm WarningSLCBox Elder, Tooele60 min

Nearby

Severe Thunderstorm Warnings in Utah, 1998Every severe thunderstorm warning in 1998

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.