Alert archive / Utah / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 3, NWS Salt Lake City, UT

February 13, 1987Davis County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Feb 13, 1987, 9:05 PM MST for Davis County, Utah. It was in force for 55 min.

The area

The counties it named.

The facts

Issued
Feb 13, 1987, 9:05 PM MST (04:05 UTC)
Expired
Feb 13, 1987, 10:00 PM MST
In force
55 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties

County Davis 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, 4.1 hours before the alert went out and 29 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 140401
SVRSLC
UTC011-140500-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
905 PM MST FRI FEB 13 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 1000 PM MST FOR PEOPLE IN THE FOLLOWING COUNTIES:
 
IN THE NORTH CENTRAL PORTION OF THE STATE OF UTAH
          ..DAVIS

HILL FIELD RADAR INDICATES THE STRONG THUNDERSTORMS HAVE EXPANDED
SOUTHWARD AND EXTEND FROM ABOUT FARMINGTON TO THE SOUTH END OF
ANTELOPE ISLAND. THESE THUNDERSTORMS CONTINUE TO MOVE EASTWARD ABOUT
20 TO 25 MPH AND SHOULD MOVE ACROSS THE WASATCH MOUNTAINS BY 10 PM.
 
 
WHEN THUNDERSTORMS ARE OCCURRING, PEOPLE SHOULD MOVE INSIDEe A
STRONG BUILDING.  DO NOT STAND BY WINDOWS.  DON'T USE TELEPHONES
OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM
HAS PASSED.  MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.

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, 8:50 PM MSTSevere Thunderstorm WarningSLCCache40 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.