Alert archive / Utah / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 95, NWS Salt Lake City, UT

September 9, 1998Washington County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Sep 9, 1998, 4:34 PM MDT for Washington County, Utah. It was in force for 56 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 9, 1998, 4:34 PM MDT (22:34 UTC)
Expired
Sep 9, 1998, 5:30 PM MDT
In force
56 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 12:00Z, 10.6 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 12:00Z on 1998-09-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 266 joules per kilogram.LCLLFCEL10008507005003002001001 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 12:00Z on 1998-09-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 139 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
266 J/kg
Mixed-layer CIN
-132 J/kg
Mixed-layer LCL
1582 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
139 m²/s²
0-3 km storm-relative helicity
189 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

Open this sounding in Storm Lab

The text

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

716 
WUUS1 KSLC 092238 RRA
SVRSLC
UTC053-092330-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
434 PM MDT WED SEP 9 1998

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

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

   * UNTIL 530 PM MDT

   * AT 425 PM MDT THE PUBLIC REPORTED A SEVERE THUNDERSTORM IN THE 
ST GEORGE AREA...MOVING NORTH AT 30 MILES PER HOUR.

   * SEVERE THUNDERSTORM WILL MOVE THROUGH THE ST GEORGE AREA BY 500 
PM MDT THEN CONTINUE NORTHWARD.
     
WIND OF 70 MPH HAVE BEEN REPORTED WITH THIS STORM.  LARGE HAIL IS 
ALSO POSSIBLE.

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.