Alert archive / Arizona / Severe Thunderstorm Watches in 2003

Severe Thunderstorm Watch 815

July 29, 20038 counties in Arizona

The Storm Prediction Center issued this severe thunderstorm watch at Jul 29, 2003, 4:00 PM MST for 8 counties in Arizona. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jul 29, 2003, 4:00 PM MST (23:00 UTC)
Expired
Jul 29, 2003, 10:00 PM MST
In force
6 hr
Issued by
the Storm Prediction Center

Counties Cochise County, AZ, Graham County, AZ, La Paz County, AZ, Maricopa County, AZ, Pima County, AZ, Pinal County, AZ, Santa Cruz County, AZ, Yuma County, AZ

The radar

The Phoenix radar (KIWA), 70 km from the middle of the area, began a volume at 23:02 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

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

IssuedProductOfficeCountiesLasted
Jul 29, 4:00 PM MSTFlash Flood WarningTWCPima
Jul 29, 4:09 PM MSTSevere Thunderstorm WarningPSRMaricopa36 min
Jul 29, 4:35 PM MSTSevere Thunderstorm WarningTWCPima55 min
Jul 29, 4:40 PM MSTSevere Thunderstorm WarningTWCPima50 min
Jul 29, 4:55 PM MSTFlash Flood WarningTWCPima5 min
Jul 29, 4:57 PM MSTSevere Thunderstorm WarningTWCPima, Pinal63 min
Jul 29, 5:33 PM MSTSevere Thunderstorm WarningPSRLa Paz, Maricopa42 min
Jul 29, 5:33 PM MSTSevere Thunderstorm WarningTWCPima57 min
Jul 29, 5:34 PM MSTSevere Thunderstorm WarningTWCPima56 min
Jul 29, 5:44 PM MSTSevere Thunderstorm WarningPSRLa Paz, Maricopa31 min
Jul 29, 6:00 PM MSTFlash Flood WarningTWCPima, Pinal
Jul 29, 6:02 PM MSTSevere Thunderstorm WarningTWCGraham, Pinal28 min
Jul 29, 6:15 PM MSTSevere Thunderstorm WarningPSRLa Paz45 min
Jul 29, 6:37 PM MSTSevere Thunderstorm WarningTWCPima53 min
Jul 29, 7:03 PM MSTSevere Thunderstorm WarningPSRLa Paz42 min
Jul 29, 7:31 PM MSTSevere Thunderstorm WarningPSRPinal44 min
Jul 29, 7:56 PM MSTSevere Thunderstorm WarningPSRMaricopa64 min
Jul 29, 9:04 PM MSTSevere Thunderstorm WarningPSRMaricopa41 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

Phoenix, AZ (KPSR), launched 12:00Z, 11.0 hours before the alert went out and 49 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, Phoenix, AZ at 12:00Z on 2003-07-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 469 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, Phoenix, AZ at 12:00Z on 2003-07-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -4 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
469 J/kg
Mixed-layer CIN
-230 J/kg
Mixed-layer LCL
1413 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
-4 m²/s²
0-3 km storm-relative helicity
129 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

Nearby

Severe Thunderstorm Watches in Arizona, 2003Every severe thunderstorm watch 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; radar from the NEXRAD Level II archive.