Alert archive / Arizona / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 66, NWS Phoenix, AZ

September 16, 2014Maricopa County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Sep 16, 2014, 3:29 AM MST for Maricopa County, Arizona. It was in force for 46 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: Sep 16, 2014, 3:29 AM MST (10:29 UTC)
Expired: Sep 16, 2014, 4:15 AM MST
In force: 46 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 10:33 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 00:00Z, 10.5 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: 110 J/kg
Mixed-layer CIN: -183 J/kg
Mixed-layer LCL: 2664 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: -17 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Phoenix, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 16, 2:27 AM MST, 1 hour 2 minutes earlier.

Area forecast discussion, Sep 16, 2:27 AM MST, 1 hour 2 minutes before

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Hazardous weather outlook, Sep 16, 2:31 AM MST, 58 minutes before

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In the hours before

Special weather statement, Sep 16, 2:50 AM MST, 39 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 16, 2:50 AM MST	Special Weather Statement	PSR	Maricopa	55 min
Sep 16, 3:19 AM MST	Areal Flood Advisory	PSR	Maricopa	4 hr
Sep 16, 4:11 AM MST	Special Weather Statement	PSR	Maricopa	64 min
Sep 16, 3:41 PM MST	Special Weather Statement	PSR		64 min
Sep 16, 4:48 PM MST	Special Weather Statement	PSR	La Paz	57 min
Sep 16, 3:46 PM MST	Special Weather Statement	PSR	Riverside	59 min
Sep 16, 3:58 PM MST	Severe Thunderstorm Warning	PSR	Riverside, San Bernardino	47 min
Sep 16, 4:34 PM MST	Flash Flood Warning	PSR	Riverside, San Bernardino	116 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2014 Every severe thunderstorm warning in 2014

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.