Alert archive / Arizona / Special Weather Statements in 2021

Special Weather Statement, NWS Phoenix, AZ

August 12, 2021La Paz County, Arizona

NWS Phoenix, AZ issued this special weather statement at Aug 12, 2021, 2:11 PM MST for La Paz County, Arizona. It was in force for 34 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, 2:11 PM MST (21:11 UTC)
Expired: Aug 12, 2021, 2:45 PM MST
In force: 34 min
Issued by: NWS Phoenix, AZ
Hail: 0.00 in
Wind: 40

County La Paz County, AZ

The radar

The Yuma radar (KYUX), 176 km from the middle of the area, began a volume at 21:14 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, 9.2 hours before the alert went out and 179 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: 1266 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 865 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 99 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, 2:02 PM MST, 9 minutes earlier.

Area forecast discussion, Aug 12, 2:02 PM MST, 9 minutes before

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In the hours before

Local storm report, Aug 12, 8:48 AM MST, 5 hours 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
848 AM MST THU AUG 12 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0530 PM     FLASH FLOOD      12 ENE GILA BEND        32.99N 112.53W
08/11/2021                   MARICOPA           AZ   DEPT OF HIGHWAYS

            **DELAYED REPORT** STATE ROUTE 238 CLOSED
            DUE TO FLASH FLOODING. LOCATION ESTIMATED
            BASED ON AREA OF HEAVIEST RAINFALL ON RADAR
            AND INFORMATION PROVIDED BY ADOT TWEET.

&&

MS

Local storm report, Aug 12, 9:03 AM MST, 5 hours 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
903 AM MST THU AUG 12 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0955 PM     FLASH FLOOD      7 ESE BUCKEYE           33.33N 112.50W
08/11/2021                   MARICOPA           AZ   MESONET

            **DELAYED REPORT** ROAD CLOSURE DUE TO FLASH
            FLOODING AT NARRAMORE ROAD DIP CROSSING.
            TIMING FROM MARICOPA COUNTY FLOOD CONTROL
            STREAM GAGE LOCATED ALONG WATERMAN WASH.

&&

MS

Local storm report, Aug 12, 9:54 AM MST, 4 hours 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
954 AM MST THU AUG 12 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0950 AM     FLASH FLOOD      6 N DEER VALLEY         33.76N 112.12W
08/12/2021                   MARICOPA           AZ   MESONET

            ROAD CLOSURE DUE TO HIGH FLOWS IN SKUNK
            CREEK. MARICOPA COUNTY FLOOD CONTROL STREAM
            GAGE LOCATED UPSTREAM NEAR CAREFREE HIGHWAY
            EXCEEDED ALARM STAGE. TIMING BASED ON TRAVEL
            TIME INFORMATION PROVIDED BY MARICOPA COUNTY
            FLOOD CONTROL.

&&

MS

Local storm report, Aug 12, 10:13 AM MST, 3 hours 58 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
1013 AM MST THU AUG 12 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0800 AM     FLOOD            3 SE PUNKIN CENTER      33.83N 111.29W
08/12/2021                   GILA               AZ   PUBLIC

            FLOODING ALONG TONTO CREEK IN TONTO BASIN
            AREA. EVACUATIONS OF LAZY JR RV PARK
            REPORTED ON SOCIAL MEDIA. HIGH FLOWS ALONG
            TONTO CREEK NOTED FROM CAMERA IMAGE PROVIDED
            BY SRP.

&&

MS

Local storm report, Aug 12, 10:30 AM MST, 3 hours 41 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
1030 AM MST THU AUG 12 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0645 AM     FLASH FLOOD      1 SSW CAVE CREEK        33.82N 111.97W
08/12/2021                   MARICOPA           AZ   MESONET

            LOW WATER CROSSINGS ALONG CAVE CREEK
            UPSTREAM OF CAREFREE HIGHWAY FLOODED. DATA
            FROM MARICOPA COUNTY FLOOD CONTROL STREAM
            GAGE ALONG CAVE CREEK LOCATED UPSTREAM OF
            LOW WATER CROSSINGS. STREAM GAGE EXCEEDED
            COUNTY SET ALARM STAGE.

&&

MS

Special weather statement, Aug 12, 2:11 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 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, 2:00 AM MST	Special Weather Statement	PSR		45 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, 2:30 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.