Alert archive / Utah / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 13, NWS Salt Lake City, UT

August 15, 1987Wasatch County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Aug 15, 1987, 6:02 PM MDT for Wasatch County, Utah. It was in force for 58 min.

The area

The counties it named.

The facts

Issued
Aug 15, 1987, 6:02 PM MDT (00:02 UTC)
Expired
Aug 15, 1987, 7:00 PM MDT
In force
58 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties

County Wasatch 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, 0.0 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 00:00Z on 1987-08-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 46 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 00:00Z on 1987-08-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 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
46 J/kg
Mixed-layer CIN
-99 J/kg
Mixed-layer LCL
2049 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
90 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 160002 RRA
SVRSLC
UTC051-160100-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
602 PM MDT SAT AUG 15 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL  700 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN CENTRAL UTAH
          ...WESTERN WASATCH
 
THE HIGHWAY PATROL REPORTED UP TO THREE-QUARTER INCH HAIL FROM A
LARGE THUNDERSTORM AT 545PM.  THIS THUNDERSTORM WILL MOVE THROUGH
WESTERN WASATCH COUNTY DURING THE NEXT HOUR.
 
 
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A
STRONG BUILDING.  DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...
AND DEADLY LIGHTNING ARE ALL POSSIBLE IQN SEVERE THUNDERSTORMS.
STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.
 
FURTHER STATEMENTS WILL BE ISSUED AS NECESSARY
ERC 16/0005Z

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Aug 15, 12:32 PM MDT, 5 hours 30 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY
1230 PM MDT SAT AUG 15 1987

     ...STRONG THUNDERSTORMS DEVELOPING OVER NORTHERN UTAH...

STRONG THUNDERSTORMS DEVELOPED RAPIDLY OVER PORTIONS OF NORTHERN
UTAH EARLY THIS AFTERNOON. THE STRONGEST THUNDERSTORMS AT 1215 PM WERE
FROM THE WASATCH FRONT EASTWARD AND NORTH OF A LINE FROM ABOUT PROVO TO
VERNAL.

SEVERAL REPORTS OF HAIL HAVE BEEN RECEIVED FROM THE SOUTH END OF THE
SALT LAKE VALLEY. MOST OF THE HAIL HAS BEEN IN THE 1/4 TO 1/2 INCH
DIAMETER RANGE. HEAVY RAINFALL HAS ALSO BEEN REPORTED.

ADDITIONAL THUNDERSTORMS ARE EXPECTED TO DEVELOP THROUGH THE AFTERNOON
HOURS. LOCALLY HEAVY SHOWERS AND HAIL ALONG WITH LOCAL MINOR ASTREET
FLOODING ARE POSSIBLE IN THE NORTHERN PORTION OF UTAH FOR THE NEXT
SEVERAL HOURS.

ADDITIONAL STATEMENTS WILL BE ISSUED AS NEEDED.

DRS 1831Z....
Special weather statement, Aug 15, 4:53 PM MDT, 1 hour 9 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY
445 PM MDT SAT AUG 15 1987

  ...STRONG THUNDERSTORMS LINGERING OVER PARTS OF NORTHERN UTAH...

SATELLITE...RADAR...AND LIGHTNING INFORMATION STILL INDICATE A FEW
AREAS OF STRONG THUNDERSTORMS LATE THIS AFTERNOON.  THE MAIN AREA
AT 430 PM WAS ALONG A LINE FROM ELY NEVADA TO DELTA THEN INTO MOST
OF THE FOLLOWING COUNTIES...UTAH...WASATCH...AND DUCHESNE.  THE
MOVEMENT OF THESE THUNDERSTORMS IS FROM THE WEST SOUTHWEST AT
ABOUT 15-20 MPH.

WITH THE VERY UNSTABLE AIRMASS OVER MUCH OF NORTHERN UTAH...CONDITIONS
REMAIN VERY FAVORABLE FOR HAIL STORMS.  SEVERAL AREAS OF NORTHERN
UTAH HAVE ALREADY REPORTED SIGNIFICANT HAIL TODAY.

THESE THUNDERSTORMS ARE EXPECTED TO CONTINUE INTO THE EARLY
EVENING BEFORE WEAKENING AND DISSIPATING.  IN ADDITION TO HAIL...
THERE IS STILL A THREAT OF LOCALLY HEAVY RAINFALL AND SOME GUSTY
WINDS.

FURTHER STATEMENTS WILL BE ISSUED AS NEEDED.

ERC 15/2250Z

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 15, 6:55 PM MDTSevere Thunderstorm WarningSLCUtah80 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.