Alert archive / Utah / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 48, NWS Salt Lake City, UT

September 7, 2002Garfield County, San Juan County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at Sep 7, 2002, 2:29 PM MDT for Garfield County, San Juan County, Utah. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Sep 7, 2002, 2:29 PM MDT (20:29 UTC)
Expired
Sep 7, 2002, 3:00 PM MDT
In force
31 min
Issued by
NWS Salt Lake City, UT
Area
Counties, with a storm outline in the text

Counties Garfield County, UT, San Juan County, UT

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Sep 7, 1:10 PM MDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Grand Junction, CO (KGJT), launched 12:00Z, 8.5 hours before the alert went out and 237 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, Grand Junction, CO at 12:00Z on 2002-09-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 34 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, Grand Junction, CO at 12:00Z on 2002-09-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 136 square meters per square second.1939587897Sfc1 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
34 J/kg
Mixed-layer CIN
-57 J/kg
Mixed-layer LCL
1287 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
136 m²/s²
0-3 km storm-relative helicity
172 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.5

Open this sounding in Storm Lab

The text

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

013 
WUUS55 KSLC 072029
SVRSLC
UTC017-037-072100-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
226 PM MDT SAT SEP 7 2002

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL GARFIELD COUNTY IN UTAH
  WEST CENTRAL SAN JUAN COUNTY IN SOUTHEAST UTAH

* UNTIL 300 PM MDT

* AT 218 PM MDT...THE PUBLIC REPORTED A SEVERE THUNDERSTORM AT   
  BULLFROG MARINA...OR ABOUT 27 MILES SOUTH OF THE HITE MARINA   
  MOVING NORTHEAST AT 35 MPH.

WIND GUSTS OF 68 MPH HAVE BEEN REPORTED AT BULLFROG.  THIS STORM IS 
ALSO PRODUCING LARGE HAIL.  

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN SALT LAKE CITY.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM MDT
SATURDAY EVENING FOR SOUTHEAST UTAH.

LAT...LON 3758 11064 3744 11050 3772 11002 3793 11047

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 6, 6:33 PM MDTSevere Thunderstorm WarningSLCSalt Lake, Utah, Wasatch42 min
Sep 6, 6:56 PM MDTSevere Thunderstorm WarningSLCBox Elder34 min
Sep 6, 7:26 PM MDTSevere Thunderstorm WarningSLCKane, Washington64 min
Sep 6, 8:17 PM MDTSevere Thunderstorm WarningSLCBox Elder43 min
Sep 6, 8:38 PM MDTFlash Flood WarningSLCWashington82 min
Sep 6, 8:43 PM MDTSevere Thunderstorm WarningSLCBox Elder47 min
Sep 6, 10:30 PM MDTSevere Thunderstorm WarningSLCBox Elder30 min
Sep 7, 7:49 AM MDTSevere Thunderstorm WarningSLCKane26 min

Nearby

Severe Thunderstorm Warnings in Utah, 2002Every severe thunderstorm warning in 2002

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.