Alert archive / Utah / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 87, NWS Salt Lake City, UT

August 26, 1998Davis County, Morgan County, Weber County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Aug 26, 1998, 5:15 PM MDT for Davis County, Morgan County, Weber County, Utah. It was in force for 45 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, 5:15 PM MDT (23:15 UTC)
Expired
Aug 26, 1998, 6:00 PM MDT
In force
45 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Davis County, UT, Morgan County, UT, Weber County, UT

The radar

The Salt Lake City radar (KMTX), 68 km from the middle of the area, began a volume at 23:19 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 12:00Z, 11.3 hours before the alert went out and 56 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 12:00Z on 1998-08-26Temperature 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 12:00Z on 1998-08-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 124 square meters per square second.19395878Sfc1 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
1925 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
124 m²/s²
0-3 km storm-relative helicity
136 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 262315 RRA
SVRSLC
UTC011-029-033-043-057-270000-

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

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS EXTNEDED A

   * SEVERE THUNDERSTORM WARNING FOR...
     EASTERN WEBER COUNTY IN UTAH
     EXTREME NORTHWESTERN SUMMIT COUNTY IN UTAH
     MORGAN COUNTY IN UTAH
     SOUTHWESTERN RICH COUNTY IN UTAH
     EXTREME NORTHEASTERN DAVIS COUNTY IN UTAH
     INCLUDING MORGAN

   * UNTIL 600 PM MDT

   * AT 504 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
     SEVERE THUNDERSTORM 4 MILES WEST OF ENTERPRISE...OR ABOUT 7
     MILES EAST OF LAYTON...MOVING EAST AT 30 MILES PER HOUR.

   * OTHER LOCATIONS IN THE WARNING INCLUDE LIBERTY...MOUNTAIN
     GREEN...ENTERPRISE...HENEFER AND EMORY

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 4139 11194 4099 11184 4102 11121 4143 11126

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 26, 1:25 PM MDTSevere Thunderstorm WarningSLCBox Elder65 min
Aug 26, 2:01 PM MDTSevere Thunderstorm WarningSLCBox Elder, Cache44 min
Aug 26, 2:14 PM MDTSevere Thunderstorm WarningSLCTooele46 min
Aug 26, 2:24 PM MDTSevere Thunderstorm WarningSLCBox Elder51 min
Aug 26, 2:41 PM MDTSevere Thunderstorm WarningSLCCache, Rich64 min
Aug 26, 3:06 PM MDTSevere Thunderstorm WarningSLCBox Elder54 min
Aug 26, 3:57 PM MDTSevere Thunderstorm WarningSLCBox Elder, Cache63 min
Aug 26, 4:25 PM MDTSevere Thunderstorm WarningSLCDavis, Morgan, Weber50 min
Aug 26, 4:29 PM MDTSevere Thunderstorm WarningSLCSalt Lake, Utah, Wasatch31 min
Aug 26, 4:29 PM MDTSevere Thunderstorm WarningSLCSummit31 min
Aug 26, 5:15 PM MDTSevere Thunderstorm WarningSLCRich, Summit45 min
Aug 26, 5:27 PM MDTSevere Thunderstorm WarningSLCSalt Lake, Tooele48 min
Aug 26, 5:41 PM MDTSevere Thunderstorm WarningSLCBox Elder64 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.