Alert archive / Utah / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 707

September 29, 2002Garfield County, Mesa County, Rio Blanco County, Colorado; 9 counties in Utah

The Storm Prediction Center issued this severe thunderstorm watch at Sep 29, 2002, 1:10 PM MDT for Garfield County, Mesa County, Rio Blanco County, Colorado; 9 counties in Utah. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Sep 29, 2002, 1:10 PM MDT (19:10 UTC)
Expired
Sep 29, 2002, 7:00 PM MDT
In force
6 hr
Issued by
the Storm Prediction Center

Counties Garfield County, CO, Mesa County, CO, Rio Blanco County, CO, Carbon County, UT, Emery County, UT, Garfield County, UT, Grand County, UT, Kane County, UT, Piute County, UT, San Juan County, UT, Uintah County, UT, Wayne County, UT

Warnings issued inside it

8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Sep 29, 1:15 PM MDTSevere Thunderstorm WarningSLCGarfield, Kane45 min
Sep 29, 1:19 PM MDTSevere Thunderstorm WarningSLCGarfield, Kane41 min
Sep 29, 2:01 PM MDTSevere Thunderstorm WarningSLCEmery, Wayne44 min
Sep 29, 2:44 PM MDTSevere Thunderstorm WarningGJTGrand46 min
Sep 29, 3:30 PM MDTFlash Flood WarningGJTGarfield3 hr
Sep 29, 4:41 PM MDTSevere Thunderstorm WarningGJTMesa49 min
Sep 29, 4:41 PM MDTSevere Thunderstorm WarningGJTMesa49 min
Sep 29, 6:30 PM MDTFlash Flood WarningGJTGarfield3 hr

The nearest sounding before it

Grand Junction, CO (KGJT), launched 12:00Z, 7.2 hours before the alert went out and 224 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 2002-09-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 77 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 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 2002-09-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 56 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
77 J/kg
Mixed-layer CIN
-36 J/kg
Mixed-layer LCL
1002 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
56 m²/s²
0-3 km storm-relative helicity
183 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

Nearby

Severe Thunderstorm Watches in Utah, 2002Severe Thunderstorm Watches in Colorado, 2002Every severe thunderstorm watch 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.