Alert archive / Utah / Tornado Warnings in 1987

Tornado Warning 1, NWS Salt Lake City, UT

August 25, 1987Cache County, Utah

NWS Salt Lake City, UT issued this tornado warning at Aug 25, 1987, 1:05 PM MDT for Cache 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: Aug 25, 1987, 1:05 PM MDT (19:05 UTC)
Expired: Aug 25, 1987, 2:00 PM MDT
In force: 55 min
Issued by: NWS Salt Lake City, UT
Area: Whole counties

County Cache 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
Aug 25, 2:05 PM MDT	Tornado F0	Cache, 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, 7.1 hours before the alert went out and 106 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: 207 J/kg
Mixed-layer CIN: -147 J/kg
Mixed-layer LCL: 1433 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 55 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 251905
TORSLC
UTC005-252000-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
105 PM MDT TUE AUG 25 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
EFFECTIVE UNTIL  200 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN NORTH CENTRAL UTAH
          ...NORTHERN CACHE
 
TWO TORNADOES HAVE BEEN REPORTED IN NORTHERN CACHE COUNTY AT AROUND 1
P.M. THIS AFTERNOON.  ONE WAS JUST WEST OF PLYMOUTH AND ANOTHER
TOUCHED DOWN BETWEEN BENSON AND THE LOGAN AIRPORT.
 
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING.  AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH
OR LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 24, 7:48 PM MDT	Flash Flood Warning	SLC	Duchesne, Uintah	117 min

Nearby

Tornado Warnings in Utah, 1987 Every tornado warning in 1987 Tornadoes 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.