Alert archive / Utah / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 92, NWS Salt Lake City, UT

August 26, 1998Duchesne County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Aug 26, 1998, 9:29 PM MDT for Duchesne County, Utah. It was in force for 31 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: Aug 26, 1998, 9:29 PM MDT (03:29 UTC)
Expired: Aug 26, 1998, 10:00 PM MDT
In force: 31 min
Issued by: NWS Salt Lake City, UT
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Duchesne County, UT

The radar

The Salt Lake City radar (KMTX), 194 km from the middle of the area, began a volume at 03:31 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, 3.5 hours before the alert went out and 131 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 49 J/kg
Mixed-layer CIN: -204 J/kg
Mixed-layer LCL: 1068 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 224 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

790 
WUUS1 KSLC 270331 RRA
SVRSLC
UTC013-270400-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
929 PM MDT WED AUG 26 1998

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

   * SEVERE THUNDERSTORM WARNING FOR...
     CENTRAL DUCHESNE COUNTY IN UTAH

   * UNTIL 1000 PM MDT

   * AT 921 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
     SEVERE THUNDERSTORM 10 MILES WEST OF MTN HOME...OR ABOUT 19
     MILES NORTHWEST OF DUCHESNE...MOVING EAST AT 35 MILES PER HOUR.

   * OTHER LOCATIONS IN THE WARNING INCLUDE ALTONAH...MTN HOME AND
     NEOLA

LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU ARE 
IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A 
SUBSTANTIAL SHELTER.

HEAVY RAINS MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED ROADS AS THEY
MAY BE WASHED OUT. WATER LEVELS OF SMALL STREAMS AND RIVERS MAY ALSO
RISE...THEREFORE SEEK HIGHER GROUND IF THREATENED BY FLOOD WATERS.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN SALT LAKE CITY.

LAT...LON 4056 11068 4027 11067 4024 11002 4055 11001

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 26, 8:54 PM MDT	Severe Thunderstorm Warning	SLC	Duchesne, Wasatch	36 min

Nearby

Severe Thunderstorm Warnings in Utah, 1998 Every 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.