Alert archive / Utah / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 21, NWS Grand Junction, CO

September 7, 2003Grand County, Utah

NWS Grand Junction, CO issued this severe thunderstorm warning at Sep 7, 2003, 2:53 PM MDT for Grand County, Utah. It was in force for 37 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, 2003, 2:53 PM MDT (20:53 UTC)
Expired
Sep 7, 2003, 3:30 PM MDT
In force
37 min
Issued by
NWS Grand Junction, CO
Area
Counties, with a storm outline in the text

County Grand County, UT

The nearest sounding before it

Grand Junction, CO (KGJT), launched 12:00Z, 8.9 hours before the alert went out and 94 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 2003-09-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 143 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 2003-09-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 47 square meters per square second.1939Sfc1 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
143 J/kg
Mixed-layer CIN
-36 J/kg
Mixed-layer LCL
839 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
47 m²/s²
0-3 km storm-relative helicity
142 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 
WUUS55 KGJT 072053
SVRGJT
UTC019-072130-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
251 PM MDT SUN SEP 7 2003

THE NATIONAL WEATHER SERVICE IN GRAND JUNCTION HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL GRAND COUNTY IN EAST CENTRAL UTAH

* UNTIL 330 PM MDT

* AT 242 PM MDT...A SEVERE THUNDERSTORM  VER CENTRAL GRAND           
  COUNTY...OR ABOUT 26 MILES NORTH OF CASTLE VALLEY...MOVING SOUTH   
  AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
OVER INTERSTATE 70 THROUGH 310 PM MDT

THIS SEVERE THUNDERSTORM WILL PRODUCE PENNY SIZE HAIL OVER 
INTERSTATE 70 BETWEEN THOMPSON SPRINGS AND CISCO.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY 
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST 
OFFICE IN GRAND JUNCTION.

LAT...LON 3905 10947 3903 10970 3867 10971 3868 10939

The office that day

Everything else NWS Grand Junction, CO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 7, 2:57 PM MDTSevere Thunderstorm WarningGJTGrand33 min

Nearby

Severe Thunderstorm Warnings in Utah, 2003Every severe thunderstorm warning in 2003

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.