Alert archive / Utah / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 35, NWS Salt Lake City, UT

June 25, 1998Box Elder County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Jun 25, 1998, 8:23 PM MDT for Box Elder County, Utah. It was in force for 52 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
Jun 25, 1998, 8:23 PM MDT (02:23 UTC)
Expired
Jun 25, 1998, 9:15 PM MDT
In force
52 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Box Elder County, UT

The radar

The Salt Lake City radar (KMTX), 68 km from the middle of the area, began a volume at 02:22 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

Salt Lake City I, UT (KSLC), launched 00:00Z, 2.4 hours before the alert went out and 139 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 1998-06-26Temperature 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 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 1998-06-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 84 square meters per square second.1939587897Sfc1 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
3054 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
84 m²/s²
0-3 km storm-relative helicity
253 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.

244 
WUUS1 KSLC 260229 RRA
SVRSLC
UTC003-260315-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
823 PM MDT THU JUN 25 1998

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

   * SEVERE THUNDERSTORM WARNING FOR...
     NORTH CENTRAL BOX ELDER COUNTY IN UTAH
     INCLUDING SNOWVILLE

   * UNTIL 915 PM MDT

   * AT 811 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
     SEVERE THUNDERSTORM 34 MILES SOUTHWEST OF SNOWVILLE...OR ABOUT
     18 MILES SOUTHEAST OF PARK VALLEY...MOVING NORTHEAST AT 40 MILES
     PER HOUR.

   * SEVERE THUNDERSTORM WILL BE...
     21 MILES SOUTHWEST OF SNOWVILLE AT 830 PM MDT
     5 MILES SOUTHWEST OF SNOWVILLE AT 855 PM MDT

VERY LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. 

LAT...LON 4164 11327 4151 11310 4170 11263 4200 11241
          4199 11306

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 25, 6:22 PM MDTSevere Thunderstorm WarningSLCBox Elder38 min
Jun 25, 6:48 PM MDTSevere Thunderstorm WarningSLCTooele42 min
Jun 25, 7:17 PM MDTSevere Thunderstorm WarningSLCBox Elder, Tooele28 min
Jun 25, 7:47 PM MDTSevere Thunderstorm WarningSLCBox Elder43 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.