Alert archive / Colorado / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 676

September 7, 2002Coconino County, Navajo County, Arizona; 5 counties in Colorado; Grand County, San Juan County, Utah

The Storm Prediction Center issued this severe thunderstorm watch at Sep 7, 2002, 12:10 PM MST for Coconino County, Navajo County, Arizona; 5 counties in Colorado; Grand County, San Juan County, Utah. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
Sep 7, 2002, 12:10 PM MST (19:10 UTC)
Expired
Sep 7, 2002, 8:00 PM MST
In force
8 hr
Issued by
the Storm Prediction Center

Counties Coconino County, AZ, Navajo County, AZ, Delta County, CO, Dolores County, CO, Mesa County, CO, Montrose County, CO, San Miguel County, CO, Grand County, UT, San Juan County, UT

The radar

The Flagstaff radar (KFSX), 179 km from the middle of the area, began a volume at 19:11 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

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

IssuedProductOfficeCountiesLasted
Sep 7, 12:13 PM MSTSevere Thunderstorm WarningFGZCoconino47 min
Sep 7, 12:20 PM MSTFlash Flood WarningFGZCoconino115 min
Sep 7, 12:21 PM MSTFlash Flood WarningFGZCoconino3 hr
Sep 7, 1:29 PM MSTSevere Thunderstorm WarningSLCGarfield, San Juan31 min
Sep 7, 1:35 PM MSTSevere Thunderstorm WarningGJTSan Juan40 min
Sep 7, 2:41 PM MSTSevere Thunderstorm WarningGJTSan Juan49 min
Sep 7, 3:04 PM MSTSevere Thunderstorm WarningGJTSan Juan26 min
Sep 7, 3:21 PM MSTSevere Thunderstorm WarningGJTSan Juan54 min

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 7.2 hours before the alert went out and 138 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, Flgstf/Belemont, AZ at 12:00Z on 2002-09-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 112 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, Flgstf/Belemont, AZ at 12:00Z on 2002-09-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 20 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
112 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
929 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
20 m²/s²
0-3 km storm-relative helicity
98 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 7, 1:30 PM MSTSevere Thunderstorm WatchSPCGila, La Paz, Maricopa, Pima, Pinal, Yuma7 hr

Nearby

Severe Thunderstorm Watches in Colorado, 2002Severe Thunderstorm Watches in Arizona, 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.