Alert archive / Utah / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 94, NWS Salt Lake City, UT

August 30, 1998Washington County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Aug 30, 1998, 6:28 PM MDT for Washington County, Utah. It was in force for 32 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
Aug 30, 1998, 6:28 PM MDT (00:28 UTC)
Expired
Aug 30, 1998, 7:00 PM MDT
In force
32 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties

County Washington County, UT

The nearest sounding before it

Mercury/Desert R, NV (KDRA), launched 00:00Z, 0.5 hours before the alert went out and 234 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, Mercury/Desert R, NV at 00:00Z on 1998-08-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1125 joules per kilogram.LCLEL10008507005003002001001 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, Mercury/Desert R, NV at 00:00Z on 1998-08-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 136 square meters per square second.1939Sfc1 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
1125 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
3052 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
136 m²/s²
0-3 km storm-relative helicity
170 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSLC 310033
SVRSLC
UTC053-310100-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
628 PM MDT SUN AUG 30 1998

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

   * SEVERE THUNDERSTORM WARNING FOR...
     SOUTH CENTRAL WASHINGTON COUNTY IN UTAH
     INCLUDING ST GEORGE

   * UNTIL 700 PM MDT

   * AT 623 PM MDT DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM  
ABOUT 8 MILES NORTHEAST OF ST GEORGE...MOVING SLOWLY SOUTH.

   * WINDS OF 60 MPH...LARGE HAIL...AND HEAVY RAINS ARE OCCURRING 
WITH THIS STORM.  SEVERAL TREES HAVE BEEN BLOWN OVER FROM THIS STORM.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 30, 6:57 PM MDTFlash Flood WarningSLCWashington63 min
Aug 30, 7:46 PM MDTFlash Flood WarningSLCWashington74 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.