Alert archive / Utah / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 106, NWS Salt Lake City, UT

September 12, 1998Summit County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Sep 12, 1998, 3:31 PM MDT for Summit County, Utah. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Sep 12, 1998, 3:31 PM MDT (21:31 UTC)
Expired
Sep 12, 1998, 4:10 PM MDT
In force
39 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties

County Summit County, UT

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 12:00Z, 9.5 hours before the alert went out and 80 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 1998-09-12Temperature 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 1998-09-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 33 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
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

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 12, 11:43 AM MDTSevere Thunderstorm WarningSLCSan Juan17 min
Sep 12, 2:19 PM MDTSevere Thunderstorm WarningSLCSan Juan26 min
Sep 12, 2:29 PM MDTSevere Thunderstorm WarningSLCDavis, Salt Lake41 min
Sep 12, 2:42 PM MDTSevere Thunderstorm WarningSLCSan Juan18 min
Sep 12, 3:02 PM MDTSevere Thunderstorm WarningSLCUtah38 min
Sep 12, 3:34 PM MDTSevere Thunderstorm WarningSLCUtah41 min
Sep 12, 5:10 PM MDTTornado WarningSLCDavis, Weber35 min
Sep 12, 5:35 PM MDTSevere Thunderstorm WarningSLCBox Elder, Weber40 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.