Alert archive / Utah / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 7, NWS Salt Lake City, UT

August 4, 1991Salt Lake County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Aug 4, 1991, 4:01 PM MDT for Salt Lake County, Utah. It was in force for 59 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Aug 4, 1991, 4:01 PM MDT (22:01 UTC)
Expired
Aug 4, 1991, 5:00 PM MDT
In force
59 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties

County Salt Lake County, UT

What was reported inside it

TimeReportWhereRemark
Aug 4, 4:16 PM MDTHail 1Salt Lake, UT
Aug 4, 5:05 PM MDTHail 0.75Salt Lake, UT

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 12:00Z, 10.0 hours before the alert went out and 13 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 1991-08-04Temperature 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 1991-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 57 square meters per square second.193958Sfc1 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
1700 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
57 m²/s²
0-3 km storm-relative helicity
159 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
Aug 3, 6:33 PM MDTFlash Flood WarningSLCGarfield, Wayne117 min
Aug 4, 4:50 PM MDTSevere Thunderstorm WarningSLCSummit55 min
Aug 4, 5:34 PM MDTSevere Thunderstorm WarningSLCSummit, Wasatch56 min
Aug 4, 5:49 PM MDTFlash Flood WarningSLCSalt Lake56 min
Aug 4, 5:49 PM MDTSevere Thunderstorm WarningSLCSalt Lake56 min

Nearby

Severe Thunderstorm Warnings in Utah, 1991Every severe thunderstorm warning in 1991

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.