Alert archive / Colorado / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 534

July 26, 200210 counties in Colorado; Grand County, San Juan County, Utah

The Storm Prediction Center issued this severe thunderstorm watch at Jul 26, 2002, 3:15 PM MDT for 10 counties in Colorado; Grand County, San Juan County, Utah. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jul 26, 2002, 3:15 PM MDT (21:15 UTC)
Expired
Jul 26, 2002, 9:00 PM MDT
In force
6 hr
Issued by
the Storm Prediction Center

Counties Delta County, CO, Dolores County, CO, Garfield County, CO, Mesa County, CO, Moffat County, CO, Montezuma County, CO, Montrose County, CO, Rio Blanco County, CO, Routt County, CO, San Miguel County, CO, Grand County, UT, San Juan County, UT

The radar

The Grand Junction radar (KGJX), 76 km from the middle of the area, began a volume at 21:17 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.

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jul 26, 3:31 PM MDTSevere Thunderstorm WarningGJTRio Blanco44 min
Jul 26, 4:12 PM MDTSevere Thunderstorm WarningGJTMesa33 min
Jul 26, 4:32 PM MDTSevere Thunderstorm WarningGJTDelta43 min

The nearest sounding before it

Grand Junction, CO (KGJT), launched 12:00Z, 9.3 hours before the alert went out and 65 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 2002-07-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 79 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 2002-07-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 30 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
79 J/kg
Mixed-layer CIN
-149 J/kg
Mixed-layer LCL
859 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
30 m²/s²
0-3 km storm-relative helicity
109 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

Nearby

Severe Thunderstorm Watches in Colorado, 2002Severe Thunderstorm Watches in Utah, 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; radar from the NEXRAD Level II archive.