Alert archive / Arizona / Special Weather Statements in 2012

Special Weather Statement, NWS Phoenix, AZ

August 21, 2012

NWS Phoenix, AZ issued this special weather statement at Aug 21, 2012, 10:54 PM MST. It was in force for 66 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 21, 2012, 10:54 PM MST (05:54 UTC)
Expired: Aug 22, 2012, 12:00 AM MST
In force: 66 min
Issued by: NWS Phoenix, AZ

The radar

The Yuma radar (KYUX), 14 km from the middle of the area, began a volume at 05:56 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

Yuma Intl Airpor, AZ (KYUM), launched 00:00Z, 5.9 hours before the alert went out and 11 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: 970 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 2360 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -24 m²/s²
0-3 km storm-relative helicity: 21 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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 21, 8:40 PM MST, 2 hours 14 minutes earlier.

Area forecast discussion, Aug 21, 8:40 PM MST, 2 hours 14 minutes before

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Hazardous weather outlook, Aug 21, 4:48 AM MST, 18 hours 6 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PHOENIX AZ
448 AM MST TUE AUG 21 2012

AZZ021>023-026>028-221215-
WEST CENTRAL DESERTS-NORTHWEST MARICOPA COUNTY-GREATER PHOENIX AREA-
SOUTHWEST DESERTS-SOUTHWEST MARICOPA COUNTY-
NORTHWEST AND NORTH CENTRAL PINAL COUNTY-
448 AM MST TUE AUG 21 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH-CENTRAL
ARIZONA...SOUTHWEST ARIZONA AND WEST-CENTRAL ARIZONA.

.DAY ONE...TODAY AND TONIGHT.

THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON AND EVENING. THE PRIMARY
HAZARDS ARE LOCALLY HEAVY RAINFALL AND FLOODING...AS WELL AS ISOLATED
DAMAGING WIND GUSTS AND BLOWING DUST.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE WEDNESDAY AND THURSDAY.
DAILY HAZARDS WILL INCLUDE LIGHTNING...GUSTY WINDS...LOCALIZED
BLOWING DUST...AND PERIODS OF HEAVY RAIN POTENTIALLY LEADING TO
FLOODING. THE MOST ACTIVE DAY WITH AN ORGANIZED SEVERE WEATHER THREAT
LOOKS TO BE WEDNESDAY...WITH POSSIBLE STRONG DAMAGING WIND GUSTS AND
LARGE HAIL.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TODAY AND WEDNESDAY.

AZZ024-221215-
SOUTHERN GILA COUNTY/TONTO NATIONAL FOREST FOOTHILLS-
448 AM MST TUE AUG 21 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST-CENTRAL ARIZONA.

.DAY ONE...TODAY AND TONIGHT.

SHOWERS AND THUNDERSTORMS ARE POSSIBLE TODAY. THE PRIMARY HAZARDS
ARE GUSTY WINDS AND PERIODS OF HEAVY RAINFALL LEADING TO FLASH
FLOODING OF LOW LYING AREAS AND NORMALLY DRY WASHES.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

THERE WILL BE A CONTINUED CHANCE OF AFTERNOON SHOWERS AND
THUNDERSTORMS THROUGH THURSDAY...WITH LESSER CHANCES BY THE END OF
THE WEEK AND WEEKEND. THE PRIMARY THREATS WILL BE LIGHTNING...GUSTY
WINDS...AND HEAVY RAINFALL POTENTIALLY LEADING TO FLOODING. THE MOST
ACTIVE DAY WITH AN ORGANIZED SEVERE WEATHER THREAT LOOKS TO BE
WEDNESDAY...WITH POSSIBLE STRONG DAMAGING WIND GUSTS AND LARGE HAIL.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TODAY AND WEDNESDAY.

AZZ020-025-CAZ030>033-221215-
LOWER COLORADO RIVER VALLEY AZ-YUMA/MARTINEZ LAKE AND VICINITY-
JOSHUA TREE NATIONAL PARK-LOWER COLORADO RIVER VALLEY CA-
RIVERSIDE COUNTY/EASTERN DESERTS-IMPERIAL COUNTY-
448 AM MST TUE AUG 21 2012 /448 AM PDT TUE AUG 21 2012/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EXTREME SOUTHWEST
ARIZONA...EXTREME WEST-CENTRAL ARIZONA...EXTREME SOUTHEAST
CALIFORNIA AND SOUTHEAST CALIFORNIA.

.DAY ONE...TODAY AND TONIGHT.

THERE IS A SLIGHT CHANCE OF THUNDERSTORMS THIS AFTERNOON AND EVENING.
THE PRIMARY THREATS WILL BE LOCALLY HEAVY RAINFALL AND
FLOODING...ALONG WITH GUSTY WINDS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

THERE IS A CHANCE OF THUNDERSTORMS WEDNESDAY...WITH LOCALLY HEAVY
RAINFALL AND FLOODING...POSSIBLE STRONG DAMAGING WIND GUSTS...AND
LARGE HAIL.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED WEDNESDAY.

NATIONAL WEATHER SERVICE PHOENIX IS ON THE INTERNET AT

WEATHER.GOV/PHOENIX

In the hours before

Special weather statement, Aug 21, 9:53 PM MST, 1 hour 1 minute before

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Special weather statement, Aug 21, 10:07 PM MST, 47 minutes before

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Local storm report, Aug 21, 10:16 PM MST, 38 minutes before

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Local storm report, Aug 21, 10:46 PM MST, 8 minutes before

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Local storm report, Aug 21, 10:49 PM MST, 5 minutes before

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Special weather statement, Aug 21, 10:54 PM 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 21, 5:10 PM MST	Special Weather Statement	PSR	La Paz	80 min
Aug 21, 5:29 PM MST	Special Weather Statement	PSR	Pinal	46 min
Aug 21, 5:37 PM MST	Flash Flood Warning	PSR	La Paz	83 min
Aug 21, 5:55 PM MST	Severe Thunderstorm Warning	PSR	La Paz	65 min
Aug 21, 5:59 PM MST	Special Weather Statement	PSR	Maricopa	76 min
Aug 21, 6:00 PM MST	Severe Thunderstorm Warning	PSR	La Paz	39 min
Aug 21, 6:09 PM MST	Special Weather Statement	PSR	Pinal	51 min
Aug 21, 6:12 PM MST	Flash Flood Warning	PSR	La Paz	71 min
Aug 21, 6:51 PM MST	Flash Flood Warning	PSR	La Paz	75 min
Aug 21, 6:56 PM MST	Areal Flood Advisory	PSR	Gila, Maricopa, Pinal	3 hr
Aug 21, 6:57 PM MST	Severe Thunderstorm Warning	PSR	Pinal	33 min
Aug 21, 7:03 PM MST	Blowing Dust Advisory	PSR		57 min
Aug 21, 7:05 PM MST	Flash Flood Warning	PSR	Pinal	55 min
Aug 21, 7:09 PM MST	Special Weather Statement	PSR	La Paz	66 min
Aug 21, 7:30 PM MST	Severe Thunderstorm Warning	PSR	Pinal	30 min
Aug 21, 7:37 PM MST	Special Weather Statement	PSR	Maricopa	53 min
Aug 21, 7:49 PM MST	Areal Flood Advisory	PSR	La Paz	90 min
Aug 21, 8:00 PM MST	Flash Flood Warning	PSR	Pinal	30 min
Aug 21, 8:16 PM MST	Areal Flood Advisory	PSR	Maricopa	119 min
Aug 21, 8:28 PM MST	Flash Flood Warning	PSR	Maricopa	2 hr
Aug 21, 9:02 PM MST	Areal Flood Advisory	PSR	Maricopa	118 min
Aug 21, 9:32 PM MST	Areal Flood Advisory	PSR	Maricopa, Pinal	118 min
Aug 21, 9:53 PM MST	Special Weather Statement	PSR		37 min
Aug 21, 10:07 PM MST	Special Weather Statement	PSR	Yuma	38 min
Aug 21, 10:24 PM MST	Blowing Dust Advisory	PSR		3 hr
Aug 21, 10:40 PM MST	Areal Flood Advisory	PSR	La Paz	81 min
Aug 21, 11:15 PM MST	Special Weather Statement	PSR	La Paz	75 min
Aug 22, 1:34 PM MST	Flash Flood Watch	PSR		15 hr
Aug 22, 1:44 PM MST	Flash Flood Warning	PSR	Maricopa, Pinal	3 hr
Aug 22, 2:32 PM MST	Areal Flood Advisory	PSR	Maricopa	118 min
Aug 22, 12:05 PM MST	Areal Flood Advisory	PSR	Riverside, San Bernardino	115 min
Aug 22, 2:15 PM MST	Areal Flood Advisory	PSR	Riverside, San Bernardino	2 hr
Aug 22, 4:23 PM MST	Special Weather Statement	PSR	Imperial	52 min
Aug 22, 4:42 PM MST	Blowing Dust Advisory	PSR		78 min

Nearby

Special Weather Statements in Arizona, 2012 Every special weather statement in 2012

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.