Alert archive / Arizona / Special Weather Statements in 2021

Special Weather Statement, NWS Phoenix, AZ

August 12, 2021

NWS Phoenix, AZ issued this special weather statement at Aug 12, 2021, 2:00 AM MST. It was in force for 45 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 12, 2021, 2:00 AM MST (09:00 UTC)
Expired: Aug 12, 2021, 2:45 AM MST
In force: 45 min
Issued by: NWS Phoenix, AZ
Hail: 0.00 in
Wind: 50

The radar

The Phoenix radar (KIWA), 41 km from the middle of the area, began a volume at 09:02 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.

The nearest sounding before it

Phoenix, AZ (KPSR), launched 00:00Z, 9.0 hours before the alert went out and 25 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: 1157 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 1687 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 52 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 12, 1:35 AM MST, 25 minutes earlier.

Area forecast discussion, Aug 12, 1:35 AM MST, 25 minutes before

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In the hours before

Local storm report, Aug 11, 9:25 PM MST, 4 hours 35 minutes before

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Local storm report, Aug 11, 9:29 PM MST, 4 hours 31 minutes before

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Local storm report, Aug 11, 9:31 PM MST, 4 hours 29 minutes before

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Local storm report, Aug 11, 9:36 PM MST, 4 hours 24 minutes before

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Local storm report, Aug 11, 9:39 PM MST, 4 hours 21 minutes before

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Special weather statement, Aug 12, 2:00 AM MST, 0 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
Aug 11, 5:03 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	42 min
Aug 11, 5:14 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	3 hr
Aug 11, 5:14 PM MST	Special Weather Statement	PSR	Maricopa	46 min
Aug 11, 5:30 PM MST	Flash Flood Warning	PSR	Maricopa	2 hr
Aug 11, 5:30 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	45 min
Aug 11, 5:39 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	3 hr
Aug 11, 5:49 PM MST	Special Weather Statement	PSR		41 min
Aug 11, 5:57 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	6 hr
Aug 11, 6:07 PM MST	Dust Storm Warning	PSR	Maricopa, Pinal	53 min
Aug 11, 6:12 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	48 min
Aug 11, 6:19 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	41 min
Aug 11, 6:20 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	4 hr
Aug 11, 6:40 PM MST	Flash Flood Warning	PSR	Maricopa	4 hr
Aug 11, 7:02 PM MST	Special Weather Statement	PSR		58 min
Aug 11, 7:11 PM MST	Special Weather Statement	PSR		64 min
Aug 11, 7:26 PM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz	3 hr
Aug 11, 7:53 PM MST	Special Weather Statement	PSR	La Paz	37 min
Aug 12, 2:42 AM MST	Flash Flood Warning Considerable damage threat	PSR	Gila, Maricopa	4 hr
Aug 12, 2:45 AM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Aug 12, 3:34 AM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Aug 12, 4:16 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	4 hr
Aug 12, 4:33 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	4 hr
Aug 12, 5:17 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	6 hr
Aug 12, 6:04 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	4 hr
Aug 12, 6:21 AM MST	Areal Flood Advisory	PSR	Maricopa	46 min
Aug 12, 7:00 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	4 hr
Aug 12, 10:09 AM MST	Areal Flood Warning	PSR	Gila	8 hr
Aug 12, 10:46 AM MST	Areal Flood Warning	PSR	Maricopa	15 hr
Aug 12, 1:30 PM MST	Flash Flood Watch	PSR	Gila, Maricopa, Pinal	5 days
Aug 12, 2:11 PM MST	Special Weather Statement	PSR	La Paz	34 min
Aug 12, 2:30 PM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Aug 12, 2:45 PM MST	Areal Flood Advisory	PSR	La Paz	3 hr
Aug 12, 2:54 PM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz, Maricopa	4 hr
Aug 12, 3:11 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	5 hr
Aug 12, 3:34 PM MST	Special Weather Statement	PSR		41 min
Aug 12, 4:14 PM MST	Areal Flood Advisory	PSR	Maricopa, Yuma	3 hr

Nearby

Special Weather Statements in Arizona, 2021 Every special weather statement in 2021

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.