Alert archive / Arizona / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 20, NWS Phoenix, AZ

August 16, 2013Maricopa County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 16, 2013, 4:18 PM MST for Maricopa County, Arizona. It was in force for 57 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 16, 2013, 4:18 PM MST (23:18 UTC)
Expired: Aug 16, 2013, 5:15 PM MST
In force: 57 min
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon

County Maricopa County, AZ

The radar

The Phoenix radar (KIWA), 77 km from the middle of the area, began a volume at 23:18 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.

The nearest sounding before it

Phoenix, AZ (KPSR), launched 12:00Z, 11.3 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 64 J/kg
Mixed-layer CIN: -381 J/kg
Mixed-layer LCL: 3217 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 9 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Phoenix, AZ issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 15, 5:05 PM MST	Special Weather Statement	PSR	Pinal	40 min
Aug 15, 5:36 PM MST	Areal Flood Advisory	PSR	Gila	3 hr
Aug 16, 3:50 AM MST	Excessive Heat Warning	PSR		3 days
Aug 16, 3:13 PM MST	Special Weather Statement	PSR	Gila	47 min
Aug 16, 3:40 PM MST	Areal Flood Advisory	PSR	Gila, Maricopa	3 hr
Aug 16, 4:02 PM MST	Special Weather Statement	PSR		58 min
Aug 16, 4:04 PM MST	Special Weather Statement	PSR		56 min
Aug 16, 4:05 PM MST	Special Weather Statement	PSR		40 min
Aug 16, 4:10 PM MST	Special Weather Statement	PSR	La Paz	65 min
Aug 16, 4:30 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	60 min
Aug 16, 4:33 PM MST	Special Weather Statement	PSR	Gila	57 min
Aug 16, 4:45 PM MST	Areal Flood Advisory	PSR	Maricopa	3 hr

Nearby

Severe Thunderstorm Warnings in Arizona, 2013 Every severe thunderstorm warning in 2013

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.