Alert archive / Utah / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 2, NWS Salt Lake City, UT

July 4, 1986Davis County, Morgan County, Weber County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Jul 4, 1986, 2:35 PM MDT for Davis County, Morgan County, Weber County, Utah. It was in force for 85 min.

The area

The counties it named.

The facts

Issued
Jul 4, 1986, 2:35 PM MDT (20:35 UTC)
Expired
Jul 4, 1986, 4:00 PM MDT
In force
85 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties

Counties Davis County, UT, Morgan County, UT, Weber 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, 8.6 hours before the alert went out and 38 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 1986-07-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 24 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 1986-07-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 84 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
24 J/kg
Mixed-layer CIN
-335 J/kg
Mixed-layer LCL
3060 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
84 m²/s²
0-3 km storm-relative helicity
98 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 042022
SVRSLC
UTC011-029-033-057-042200-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
235 PM MDT FRI JUL  4 1986
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL  4000 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTIES:
 
IN NORTH CENTRAL UTAH
          ..DAVIS..MORGAN..RICH
          ..WEBER

 
A LINE OF THUNDERSTORMS IS RUNNING FROM THE CACHE VALLEY SOUTHWEST TO
THE GREAT SALT LAKE. WIND GUSTS TO OVER 70 MPH HAVE BEEN REPORTED
WITH THESE CELLS IN THE CACHE VALLEY AND SIMILAR WINDS CAN BE
EXPECTED WITH OTHER CELLS. HEAVY RAINS HAVE ALSO OCCURRED AND ARE
LIKELY IN A FEW SPOTS. THESE STRONG THUNDERSTORMS WILL AFFECT THE
WARNED COUNTIES UNTIL ABOUT 4 PM AND THE WARNING MAY HAVE TO BE
EXTENDED IF CONDITIONS WARRENT.
 
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 IN SEVERE THUNDERSTORMS.  STAY
INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH,
DESTRUCTIVE HAIL, DEADLY LIGHTNING AND VERY HEAVY RAIN.  FOR YOUR
PROTECTION MOVE TO AN INTERIOR 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.
 
2031Z-..KML

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, Jul 4, 2:13 PM MDT, 22 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
215 PM MDT FRI JUL 4 1986

...HIGH WIND WARNING WESTERN VALLEYS THROUGH THIS EVENING...

A RATHER STRONG COLD FRONT FOR EARLY JULY IS BEARING DOWN UPON THE
STATE THIS AFTERNOON. GUSTY SOUTH WINDS AHEAD OF THE SYSTEM HAVE
REACHED NEAR 40 MPH IS SOME WESTERN VALLEYS..AND WILL LIKELY
STRENGTHEN DURING THE REMAINDER OF THIS AFTERNOON AND EVENING.
A HIGH WIND WARNING HAS BEEN ISSUED FOR THE WESTERN UTAH VALLEYS
IN ANTICIPATION OF LOCAL GUSTS TO NEAR 60 MPH. BLOWING DUST MAY
REDUCE VISIBLITIES IN SOME AREAS.

THE FRONT IS SHAPING UP IN WESTERN NEVADA AND WILL MOVE THROUGH
NORTHWEST SECTIONS DURING THE EVENING..JUST IN TIME TO SPOIL THE
FIREWORKS DISPLAYS. THE AIR IS SOMEWHAT UNSTABLE AND MOIST..POSING
THE THREAT OF ACTIVE THUNDERSTORMS ALONG THE WASATCH FRONT AND
NORTHERN MOUNTAINS DURING THE LATE AFTERNOON. PERSONS PLANNING
OUTDOOR COOKOUTS AND OTHER HOLIDAY ACTIVITIES SHOULD KEEP AN EYE
TO THE SKY FOR RAPIDLY CHANGING CONDITIONS.

GUSTY WINDS WITH ANY THUNDERSTORMS PLUS THE ALREADY STIFF SOUTH
BREEZES WILL MAKE BOATING ACTIVITIES A LITTLE RISKY DURING THE
REMAINDER OF THE AFTERNOON. BOATERS AND CAMPERS SHOULD ALSO BE
CONSIOUS OF LIGHTENING AND NOT REAMIN IN EXPOSED TERRAIN OR OPEN
WATER DURING THE APPROACH OF THUNDERSTORMS.

THE AIRMASS FOLLOWING THE FRONT IS QUITE COOL. SOME SHOWER
ACTIVITY IS LIKELY TO PERSIST INTO SATURDAY ACROSS NORTHERN
UTAH..AND TO A LESSER DEGREE  IN THE SOUTH. WHILE THE COOL AIR
SHOULD PENETRATE THROUGH THE ENTIRE STATE BY LATER STATURDAY..
THE MOST DRASTIC CHANGES WILL BE IN THE NORTH WHERE READINGS
AVERAGING 20 DEGREES BELOW THE PAST SEVERAL DAYS ARE LIKELY.

IN ADDITION..CAMPERS AND HIKERS IN THE HIGHER ELEVATION ZONES OF
NORTHERN UTAH..SAY ABOVE 9000 FT WILL PROBABLY AWAKEN SATURDAY
MORNING TO SEE A BLANKET OF SNOW OUTSIDE OF THE TENT. THE AIRMASS
IS COLD ENOUGH SO THAT THE SNOW LEVEL WILL LOWER TO 9000 FT AND
PERHAPS LOCALLY AS LOW AS 8500 FT LATER TONIGHT AND EARLY SATURDAY.
A FEW INCHES ACCUMULATION IS PROBABLE AT PLACES SUCH AS MIRROR LAKE
AND TRIAL LAKE IN THE UINTAS.

THE PROSPECT FOR FIREWORKS DISPLAYS TONIGHT IS QUESTIONABLE.
STRONG WINDS WILL MAKE UNINTENTIONAL FIRES A REAL POSSIBILITY.
THERE IS ALSO A THREAT OF RAIN.

WHILE THE NEXT 24 HOURS OR SO WILL BE QUITE CHANGEABLE ACROSS
THE STATE..THE REST OF THE HOLIDAY WEEKEND SHOULD BE MUCH
QUIETER AND COMFORTABLE.

FURTHER STATEMENTS WILL BE ISSUED AS NEEDED.

KML...2015Z

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 4, 2:35 PM MDTSevere Thunderstorm WarningSLCRich85 min

Nearby

Severe Thunderstorm Warnings in Utah, 1986Every severe thunderstorm warning in 1986

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.