Alert archive / Arizona / Severe Thunderstorm Watches in 2000

Severe Thunderstorm Watch 717

August 30, 20007 counties in Arizona

The Storm Prediction Center issued this severe thunderstorm watch at Aug 30, 2000, 11:30 AM MST for 7 counties in Arizona. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Aug 30, 2000, 11:30 AM MST (18:30 UTC)
Expired
Aug 30, 2000, 5:00 PM MST
In force
6 hr
Issued by
the Storm Prediction Center

Counties Cochise County, AZ, Gila County, AZ, Graham County, AZ, Greenlee County, AZ, Maricopa County, AZ, Pinal County, AZ, Yavapai County, AZ

The radar

The Phoenix radar (KIWA), 44 km from the middle of the area, began a volume at 18:29 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

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

IssuedProductOfficeCountiesLasted
Aug 30, 2:03 PM MSTSevere Thunderstorm WarningPSRPinal62 min
Aug 30, 3:28 PM MSTSevere Thunderstorm WarningPSRMaricopa62 min

The nearest sounding before it

Phoenix, AZ (KPSR), launched 12:00Z, 6.5 hours before the alert went out and 63 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 2000-08-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 504 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 2000-08-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 4 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
504 J/kg
Mixed-layer CIN
-74 J/kg
Mixed-layer LCL
1384 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
4 m²/s²
0-3 km storm-relative helicity
28 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

Nearby

Severe Thunderstorm Watches in Arizona, 2000Every severe thunderstorm watch in 2000

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.