Alert archive / Utah / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 5, NWS Salt Lake City, UT

July 26, 1986Box Elder County, Cache County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Jul 26, 1986, 6:33 PM MDT for Box Elder County, Cache County, Utah. It was in force for 87 min.

The area

The counties it named.

The facts

Issued: Jul 26, 1986, 6:33 PM MDT (00:33 UTC)
Expired: Jul 26, 1986, 8:00 PM MDT
In force: 87 min
Issued by: NWS Salt Lake City, UT
Area: Whole counties

Counties Box Elder County, UT, 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, 0.6 hours before the alert went out and 103 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 42 J/kg
Mixed-layer CIN: -221 J/kg
Mixed-layer LCL: 2431 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: -33 m²/s²
0-3 km storm-relative helicity: 88 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 270033 RRA
SVRSLC
UTC003-005-033-270200-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
633 PM MDT SAT JUL 26 1986
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL  800 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTIES:
 
IN NORTHWEST UTAH
          ..EASTERN BOX ELDER
IN NORTH CENTRAL UTAH
          ..CACHE AND NORTHERN RICH

VERY STRONG THUNDERSTORMS OVER EXTREME NORTH CENTRAL UTAH HAVE
BROUGHT WINDS TO 60 MPH TO PORTIONS OF EASTERN BOX ELDER COUNTY AT
630 PM. WINDS IN EXCESS OF 60 MPH CAN BE EXPECTED IN EASTERN BOX
ELDER.. CACHE.. AND NORTHERN RICH COUNTIES UNTIL 8 PM THIS EVENING
ALONG WITH POSSIBLE LARGE HAIL.. HEAVY RAINFALL.. AND FREQUENT
LIGHTNING.
WHEN THUNDERSTORMS ARE OCCURRING, PEOPLE SHOULD MOVE INSIDE 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.
 
ERC 270033Z

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 26, 3:00 PM MDT, 3 hours 33 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
300 PM MDT SAT JUL 26 1986

                 ...SOME THUNDER AND A LITTLE HAIL...

THUNDERSHOWERS ARE SPRINGING UP OVER NORTHERN UTAH AGAIN THIS
AFTERNOON.. AS TROPICAL MOISTURE CONTINUES OVER THE AREA. IN ADDITION
TO THESE THUNDERSHOWERS.. SOME REPORTS OF SMALL HAIL HAVE BEEN RECEIVED
IN THE SALT LAKE AREA.

IN KEARNS.. HAILSTONE CLUSTERS TO 11/4 INCHES IN DIAMETER WERE NOTED..
WHILE IN WEST VALLEY CITY INDIVIDUAL MARBLE SIZED HAILSTONES WERE SEEN.
A FEW OTHER SPOTS IN THE VALLEY HAVE RECEIVED PING PONG BALL TO PEA
SIZED HAIL. THE WEST VALLEY OBSERVER ALSO HAD .3 INCHES OF RAINFALL IN
15 MINUTES.

SCATTERED THUNDERSHOWER%S ARE EXPECTED TO CONTINUE ALONG THE WASATCH
FRONT THE REST OF THIS AFTERNOON AND EVENING. SOME ADDITIONAL SMALL
HAIL IS POSSIBLE.

FURTHER STATEMENTS WILL BE ISSUED IF NECESSARY.

RW/DC 2100Z

Special weather statement, Jul 26, 5:48 PM MDT, 45 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
545 PM MDT SAT JUL 26 1986

          ...STRONG THUNDERSTORMS OVER NORTHERN UTAH...

AT 530 PM RADAR OBSERVATIONS AND SATELLITE IMAGERY INDICATED STRONG
THUNDERSTORMS OVER SEVERAL AREAS OF NORTHERN UTAH TO INCLUDE.. 10
MILES WEST OF SALT LAKE CITY.. OVER THE NORTH END OF THE GREAT
SALT LAKE.. BETWEEN DUGWAY AND FAIRFIELD.. AND JUST EAST OF HEBER
CITY.

THESE THUNDERSTORMS ARE MOVING FROM THE SOUTHWEST BETWEEN 15 AND
25 MPH. THE MAIN THREAT FROM THESE THUNDERSTORMS WILL LIKELY
BE AREAS OF SMALL HAIL. IN ADDITION STRONG GUSTY WINDS.. DANGEROUS
LIGHTNING.. AND BRIEF HEAVY RAINFALL ARE POSSIBLE FROM THESE
THUNDERSTORMS OVER NORTHERN UTAH THROUGH THIS EVENING. THE MAIN
ACTIVITY IS EXPECTED TO BE DECREASING ABOUT 11 PM TO MIDNIGHT TONIGHT.

THUS PERSONS IN NORTHERN UTAH SHOULD BE PREPARED FOR STRONG
THUNDERSTORMS THIS EVENING.

FURTHER STATEMENTS WILL BE ISSUED AS NEEDEBD.

ERC 26/2346Z

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 26, 6:33 PM MDT	Severe Thunderstorm Warning	SLC	Rich	87 min

Nearby

Severe Thunderstorm Warnings in Utah, 1986 Every 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.