Alert archive / Utah / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 104, NWS Salt Lake City, UT

September 7, 1997Davis County, Morgan County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Sep 7, 1997, 7:05 AM MDT for Davis County, Morgan County, Utah. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Sep 7, 1997, 7:05 AM MDT (13:05 UTC)
Expired
Sep 7, 1997, 7:35 AM MDT
In force
30 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties

Counties Davis County, UT, Morgan County, UT

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 12:00Z, 1.1 hours before the alert went out and 29 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 1997-09-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 25 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 1997-09-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 50 square meters per square second.19395878Sfc1 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
25 J/kg
Mixed-layer CIN
-290 J/kg
Mixed-layer LCL
2380 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
50 m²/s²
0-3 km storm-relative helicity
91 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSLC 071307 RRA
SVRSLC
UTC011-029-071335-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
705 AM MDT SUN SEP 7 1997

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY UT HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 735 AM MDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...

IN NORTHWESTERN UTAH

   ...NORTHEASTERN DAVIS COUNTY
   ...WESTERN MORGAN COUNTY
 
AT 701 AM MDT...A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
RADAR 11 MILES NORTHWEST OF MORGAN OR 5 MILES WEST OF PETERSON
MOVING EAST AT 15 MPH.

THIS STORM CAN BE EXPECTED IN THE VICINITY OF...
PETERSON               AT AROUND 710 AM MDT
ENTERPRISE             AT AROUND 715 AM MDT
MILTON                 AT AROUND 720 AM MDT
 
THIS THUNDERSTORM HAS PRODUCED LARGE HAIL AND FREQUENT LIGTNING
AND MAY PRODUCE STRONG GUSTY WINDS.  TAKE COVER WHEN
THREATENING WEATHER APPROACHES.

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 6, 7:15 PM MDTSevere Thunderstorm WarningSLCBox Elder60 min
Sep 6, 8:50 PM MDTFlash Flood WarningSLCGarfield, Kane55 min
Sep 6, 9:22 PM MDTSevere Thunderstorm WarningSLCBox Elder58 min
Sep 6, 9:58 PM MDTFlash Flood WarningSLCKane2 hr
Sep 6, 10:19 PM MDTSevere Thunderstorm WarningSLCBox Elder, Cache61 min
Sep 7, 2:54 AM MDTSevere Thunderstorm WarningSLCUtah41 min
Sep 7, 5:58 AM MDTSevere Thunderstorm WarningSLCBox Elder, Weber47 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; the sounding from the Mesonet's radiosonde archive.