Alert archive / Utah / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 13, NWS Salt Lake City, UT

September 25, 1990Summit County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Sep 25, 1990, 5:25 PM MDT for Summit County, Utah. It was in force for 65 min.

The area

The counties it named.

The facts

Issued
Sep 25, 1990, 5:25 PM MDT (23:25 UTC)
Expired
Sep 25, 1990, 6:30 PM MDT
In force
65 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties

County Summit 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

Salt Lake City I, UT (KSLC), launched 12:00Z, 11.4 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 1990-09-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 94 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, Salt Lake City I, UT at 12:00Z on 1990-09-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -39 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
94 J/kg
Mixed-layer CIN
-138 J/kg
Mixed-layer LCL
1691 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
-39 m²/s²
0-3 km storm-relative helicity
17 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 252324
SVRSLC
UTC043-260030-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
525 PM MDT TUE SEP 25 1990

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  630 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION......

IN NORTH CENTRAL UTAH

   ...WESTERN HALF OF SUMMIT COUNTY.

THE THUNDERSTORMS THAT BROUGHT UP TO ONE AND ONE-HALF INCH HAIL TO
SALT LAKE COUNTY IN THE LAST COUPLE OF HOURS ARE MOVING INTO
WESTERN SUMMIT COUNTY AT 515 PM.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN iINTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

ERC...25/2323Z

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 25, 2:10 PM MDTSevere Thunderstorm WarningSLCSalt Lake60 min
Sep 25, 4:05 PM MDTSevere Thunderstorm WarningSLCSalt Lake55 min
Sep 25, 5:05 PM MDTSevere Thunderstorm WarningSLCSalt Lake55 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.