Alert archive / Utah / Tornado Warnings in 1986

Tornado Warning 1, NWS Salt Lake City, UT

September 9, 1986Davis County, Weber County, Utah

NWS Salt Lake City, UT issued this tornado warning at Sep 9, 1986, 12:05 PM MDT for Davis County, Weber County, Utah. It was in force for 55 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Sep 9, 1986, 12:05 PM MDT (18:05 UTC)
Expired: Sep 9, 1986, 1:00 PM MDT
In force: 55 min
Issued by: NWS Salt Lake City, UT
Area: Whole counties

Counties Davis 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.

What was reported inside it

Time	Report	Where	Remark
Sep 9, 12:15 PM MDT	Hail 1	Weber, UT

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 12:00Z, 6.1 hours before the alert went out and 40 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: 80 J/kg
Mixed-layer CIN: -213 J/kg
Mixed-layer LCL: 1829 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 127 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 091808
TORSLC
UTC011-057-091900-

BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1205 PM MDT TUE SEP  9 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
EFFECTIVE UNTIL 100 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTIES:

IN NORTH CENTRAL UTAH
          ..DAVIS..WEBER

THE HILL AFB RADAR SHOWS A POSSIBLE TORNADO 8 MILES WEST OF LAYTON
UTAH.. ALONG THE EAST SHORES OF THE GREAT SALT LAKE.  THE STORM IS
MOVING EAST AT 30 MILES AN HOUR AND IS EXPECTED TO MOVE INTO THE
WARNING AREA DURING THE NEXT HOUR.

IF YOU ARE CAUGHT OUTSIDE, SEEK SHELTER FROM THREATENING WEATHER IN A
STRONG BUILDING IMMEDIATELY.

DAMAGING WIND, LARGE HAIL, VERY HEAVY RAIN, AND DEADLY LIGHTNING ARE
ALL POSSIBLE WITH THIS STORM.  STAY INSIDE AWAY FROM WINDOWS UNTIL
THE STORM HAS PASSED.

DC/WA 1808Z

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 9, 10:59 AM MDT	Severe Thunderstorm Warning	SLC	Box Elder, Weber	2 hr
Sep 9, 10:59 AM MDT	Severe Thunderstorm Warning	SLC	Davis, Salt Lake, Tooele	2 hr
Sep 9, 3:55 PM MDT	Flash Flood Warning	SLC	San Juan	2 hr

Nearby

Tornado Warnings in Utah, 1986 Every tornado warning in 1986 Tornadoes 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.