Alert archive / Utah / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 3, NWS Salt Lake City, UT

July 15, 19904 counties in Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Jul 15, 1990, 5:42 PM MDT for 4 counties in Utah. It was in force for 63 min.

The area

The counties it named.

The facts

Issued
Jul 15, 1990, 5:42 PM MDT (23:42 UTC)
Expired
Jul 15, 1990, 6:45 PM MDT
In force
63 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties

Counties Garfield County, UT, Kane County, UT, San Juan County, UT, Washington County, UT

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Winslow (Autob), AZ (KINW), launched 12:00Z, 11.7 hours before the alert went out and 290 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, Winslow (Autob), AZ at 12:00Z on 1990-07-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 40 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, Winslow (Autob), AZ at 12:00Z on 1990-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 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
40 J/kg
Mixed-layer CIN
-203 J/kg
Mixed-layer LCL
1388 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
18 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.

000 
TTAA00 KSLC 152350
SVRSLC
UTC019-017-025-055-037-053-160045-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
542 PM MDT SUN JUL 15 1990
 
THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  645 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN EAST CENTRAL UTAH
 
   ...SOUTHERN GRAND COUNTY
 
IN SOUTH CENTRAL UTAH
 
   ...GARFIELD COUNTY...KANE COUNTY...EAST CENTRAL WAYNE COUNTY
 
IN SOUTHEAST UTAH
 
   ...SAN JUAN COUNTY
 
IN SOUTHWEST UTAH
 
   ...WASHINGTON COUNTY
 
 
THUNDERSTORMS ARE DEVELOPING OVER MUCH OF SOUTHERN UTAH WITH VERY
GUSTY WINDS ASSOCIATED WITH SOME OF THEM. WINDS IN EXCESS OF 70 MPH
HAVE BEEN REPORTED FROM THE DANGLING ROPE MARINA IN LAKE POWELL AND
OVER 50 MPH FROM OTHER PORTIONS OF LAKE POWELL AND IN THE ST. GEORGE
VICINITY.  WHILE THESE STRONG WINDS ARE RATHER RANDOM IN
NATURE..CONDITIONS ARE FAVORABLE FOR THE NEXT HOUR OR SO FOR THESE TO
OCCUR.
 
PERSONS IN THE WARNING AREA SHOULD BE ALERT FOR RAPIDLY DEVLOPING
THUNDERSTORMS AND ASSOCIATED STRONG DAMAGING WINDS..BRIEF HEAVY RAIN
AND SMALL HAIL.
 
STAY TUNED TO LOCAL MEADIA OUTLETS AND NOAA WEATHER RADIO FOR FURTHER
INFORMATION AND WARNING.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 15, 5:42 PM MDTSevere Thunderstorm WarningSLCGrand, Wayne63 min

Nearby

Severe Thunderstorm Warnings in Utah, 1990Every severe thunderstorm warning in 1990

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.