Alert archive / Utah / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 46, NWS Salt Lake City, UT

June 18, 1997Utah County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Jun 18, 1997, 6:27 PM MDT for Utah County, Utah. It was in force for 33 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
Jun 18, 1997, 6:27 PM MDT (00:27 UTC)
Expired
Jun 18, 1997, 7:00 PM MDT
In force
33 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties

County Utah County, UT

The radar

The Salt Lake City radar (KMTX), 143 km from the middle of the area, began a volume at 00:31 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Jun 18, 6:32 PM MDTHail 0.75Pleasant Grove, UTA severe thunderstorm moved through Utah County. A spotter in Pleasant Grove measured 3/4" hail from this storm.

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.

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 00:00Z, 0.5 hours before the alert went out and 76 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 1997-06-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 302 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 1997-06-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 25 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
302 J/kg
Mixed-layer CIN
-73 J/kg
Mixed-layer LCL
2856 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
25 m²/s²
0-3 km storm-relative helicity
144 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KSLC 190028 RRA
SVRSLC
UTC049-190100-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
627 PM MDT WED JUN 18 1997

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY UT HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 700 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN NORTHWESTERN UTAH

   ...NORTHERN UTAH COUNTY
 
AT 623 PM MDT...A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
RADAR 10 MILES NORTHWEST OF PROVO OR 2 MILES WEST OF PLEASANT GROVE
MOVING EAST AT 25 MPH.

THIS STORM WILL AFFECT COMMUNITIES IN NORTHERN UTAH
COUNTY...INCLUDING OLMSTEAD...PLEASANT GROVE...LINDON
...OREM...SPRINGDELL AND VIVIAN PARK.
 
THIS STORM MAY PRODUCE STRONG GUSTY WIND...LARGE HAIL...AND
FREQUENT LIGHTNING.  TAKE COVER WHEN THREATENING WEATHER APPROACHES.

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 18, 9:07 PM MDTSevere Thunderstorm WarningSLCSalt Lake28 min

Nearby

Severe Thunderstorm Warnings in Utah, 1997Every severe thunderstorm warning in 1997

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; radar from the NEXRAD Level II archive.