Alert archive / Utah / Tornado Warnings in 1998

Tornado Warning 1, NWS Salt Lake City, UT

September 12, 1998Davis County, Weber County, Utah

NWS Salt Lake City, UT issued this tornado warning at Sep 12, 1998, 5:10 PM MDT for Davis County, Weber County, Utah. It was in force for 35 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: Sep 12, 1998, 5:10 PM MDT (23:10 UTC)
Expired: Sep 12, 1998, 5:45 PM MDT
In force: 35 min
Issued by: NWS Salt Lake City, UT
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Davis County, UT, Weber County, UT

The radar

The Salt Lake City radar (KMTX), 30 km from the middle of the area, began a volume at 23:10 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, 11.2 hours before the alert went out and 46 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1350 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 53 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.

330 
WFUS1 KSLC 122314 RRA
TORSLC
UTC011-057-122345-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
510 PM MDT SAT SEP 12 1998

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

   * TORNADO WARNING FOR...
     WESTERN WEBER COUNTY IN UTAH
     NORTHEASTERN DAVIS COUNTY IN UTAH
     INCLUDING LAYTON AND OGDEN

   * UNTIL 545 PM MDT

   * AT 500 PM MDT THE PUBLIC REPORTED A TORNADO NEAR SYRACUSE...OR  
     ABOUT 5 MILES WEST OF LAYTON...MOVING NORTHEAST AT 20 MILES PER 
     HOUR.  WATER SPOUTS ARE ALSO BEING REPORTED OVER THE LAKE WEST OF
     CLINTON

   * OTHER LOCATIONS IN THE WARNING INCLUDE CLEARFIELD...SOUTH
     OGDEN...HILL AFB...SYRACUSE...NORTH OGDEN AND ROY

THIS IS AN EXTREMELY DANGEROUS AND POTENTIALLY LIFE THREATENING
SITUATION. IF YOU ARE IN THE PATH OF THIS TORNADO...TAKE COVER
IMMEDIATELY.

LAT...LON 4118 11232 4098 11214 4109 11187 4135 11193

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 12, 11:43 AM MDT	Severe Thunderstorm Warning	SLC	San Juan	17 min
Sep 12, 2:19 PM MDT	Severe Thunderstorm Warning	SLC	San Juan	26 min
Sep 12, 2:29 PM MDT	Severe Thunderstorm Warning	SLC	Davis, Salt Lake	41 min
Sep 12, 2:42 PM MDT	Severe Thunderstorm Warning	SLC	San Juan	18 min
Sep 12, 3:02 PM MDT	Severe Thunderstorm Warning	SLC	Utah	38 min
Sep 12, 3:31 PM MDT	Severe Thunderstorm Warning	SLC	Summit	39 min
Sep 12, 3:34 PM MDT	Severe Thunderstorm Warning	SLC	Utah	41 min
Sep 12, 5:35 PM MDT	Severe Thunderstorm Warning	SLC	Box Elder, Weber	40 min

Nearby

Tornado Warnings in Utah, 1998 Every tornado warning in 1998 Tornadoes 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.