Alert archive / Arizona / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 670

July 27, 20044 counties in Arizona

The Storm Prediction Center issued this severe thunderstorm watch at Jul 27, 2004, 1:30 PM MST for 4 counties in Arizona. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jul 27, 2004, 1:30 PM MST (20:30 UTC)
Expired
Jul 27, 2004, 7:00 PM MST
In force
6 hr
Issued by
the Storm Prediction Center

Counties Gila County, AZ, Graham County, AZ, Greenlee County, AZ, Yavapai County, AZ

The radar

The Flagstaff radar (KFSX), 64 km from the middle of the area, began a volume at 20:30 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

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

IssuedProductOfficeCountiesLasted
Jul 27, 1:30 PM MSTSevere Thunderstorm WarningFGZYavapai30 min
Jul 27, 2:01 PM MSTSevere Thunderstorm WarningFGZYavapai29 min
Jul 27, 3:21 PM MSTSevere Thunderstorm WarningFGZYavapai24 min
Jul 27, 4:46 PM MSTFlash Flood WarningTWCGraham59 min
Jul 27, 5:17 PM MSTSevere Thunderstorm WarningPSRGila58 min
Jul 27, 6:49 PM MSTFlash Flood WarningTWCGraham56 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 8.5 hours before the alert went out and 127 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 2004-07-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 10 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 2004-07-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 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
10 J/kg
Mixed-layer CIN
-204 J/kg
Mixed-layer LCL
1870 m above ground
0-6 km bulk shear
0 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
0 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 27, 11:34 AM MSTMesoscale DiscussionSPCApache, Gila, Greenlee, Mohave, Navajo, Yavapai2 hr

Nearby

Severe Thunderstorm Watches in Arizona, 2004Every severe thunderstorm watch in 2004

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.