Alert archive / Utah / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 2, NWS Salt Lake City, UT

February 13, 1987Cache County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Feb 13, 1987, 8:50 PM MST for Cache County, Utah. It was in force for 40 min.

The area

The counties it named.

The facts

Issued
Feb 13, 1987, 8:50 PM MST (03:50 UTC)
Expired
Feb 13, 1987, 9:30 PM MST
In force
40 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties

County Cache 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 00:00Z, 3.8 hours before the alert went out and 106 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 00:00Z on 1987-02-14Temperature 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 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 00:00Z on 1987-02-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 117 square meters per square second.19395878Sfc1 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
817 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
117 m²/s²
0-3 km storm-relative helicity
160 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 
TTAAOO KSLC 140348
SVRSLC
UTC005-140430-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
850 PM MST FRI FEB 13 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL  930 PM MST FOR PEOPLE IN THE FOLLOWING COUNTIES:
 
IN THE NORTH CENTRAL PORTION OF THE STATE OF UTAH
          ..CACHE

REPORTS FROM THE CACHE VALLEY INDICATE STRONG THUNDERSTORMS WITH
HEAVY RAIN...HAIL_...AND AT LEAST ONE WIND GUST TO 70 MPH.
 
 
THESE THUNDERSTORMS ARE LIKELY TO CAUSE DAMAGING WINDS IN EXCESS OF
60 MPH.  THUNDERSTORM RAIN MAY PRODUCE FLASH FLOODS.  STAY OUT OF
NORMALLY LOW OR DRY CREEK BEDS AND LOW LYING AREAS.

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 13, 8:16 PM MSTSevere Thunderstorm WarningSLCDavis, Weber44 min
Feb 13, 9:05 PM MSTSevere Thunderstorm WarningSLCDavis55 min

Nearby

Severe Thunderstorm Warnings in Utah, 1987Every severe thunderstorm warning in 1987

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.