Alert archive / Arizona / Special Weather Statements in 2021

Special Weather Statement, NWS Phoenix, AZ

August 9, 2021La Paz County, Arizona

NWS Phoenix, AZ issued this special weather statement at Aug 9, 2021, 5:44 PM MST for La Paz 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 outline as issued.

The facts

Issued: Aug 9, 2021, 5:44 PM MST (00:44 UTC)
Expired: Aug 9, 2021, 6:30 PM MST
In force: 46 min
Issued by: NWS Phoenix, AZ
Hail: 0.00 in
Wind: 50

County La Paz County, AZ

The radar

The Yuma radar (KYUX), 157 km from the middle of the area, began a volume at 00:44 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, 0.7 hours before the alert went out and 217 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: 413 J/kg
Mixed-layer CIN: -229 J/kg
Mixed-layer LCL: 1911 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 88 m²/s²
0-3 km storm-relative helicity: 136 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 9, 5:11 PM MST, 33 minutes earlier.

Area forecast discussion, Aug 9, 5:11 PM MST, 33 minutes before

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In the hours before

Special weather statement, Aug 9, 3:32 PM MST, 2 hours 12 minutes before

Special Weather Statement
National Weather Service Phoenix AZ
332 PM MST Mon Aug 9 2021

AZZ533-092315-
Central La Paz AZ-
332 PM MST Mon Aug 9 2021

...A strong thunderstorm will impact portions of north central La Paz
County through 415 PM MST...

At 331 PM MST, Doppler radar was tracking a strong thunderstorm near
Bouse, or 16 miles southeast of Parker, moving northeast at 15 mph.

HAZARD...Wind gusts of 50 to 55 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Bouse.

This includes the following highways...
AZ Route 72 between mile markers 15 and 33.
AZ Route 95 between mile markers 123 and 128.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Locally heavy rainfall is also occurring with this storm and may
lead to localized flooding. Do not drive your vehicle through
flooded roadways.

&&

LAT...LON 3374 11402 3389 11425 3413 11412 3412 11387
      3389 11392
TIME...MOT...LOC 2231Z 211DEG 15KT 3397 11407

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...55 MPH

AJ

Special weather statement, Aug 9, 4:11 PM MST, 1 hour 33 minutes before

Special Weather Statement
National Weather Service Phoenix AZ
411 PM PDT Mon Aug 9 2021

CAZ564-568-570-100000-
Chuckwalla Mountains CA-Chuckwalla Valley CA-Chiriaco Summit CA-
411 PM PDT Mon Aug 9 2021

...A strong thunderstorm will impact portions of Riverside County
through 500 PM PDT...

At 410 PM PDT, Doppler radar was tracking a strong thunderstorm near
Desert Center, moving north at 10 mph.

HAZARD...Wind gusts of 50 to 55 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Desert Center and Eagle Mtn.

This includes the following highways...
CA Interstate 10 between mile markers 98 and 112.
CA Route 177 between mile markers 1 and 14.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3364 11529 3368 11553 3390 11549 3387 11519
TIME...MOT...LOC 2310Z 199DEG 8KT 3379 11538

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...55 MPH

AJ

Special weather statement, Aug 9, 5:44 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 9, 5:24 PM MST	Areal Flood Advisory	PSR	La Paz	3 hr
Aug 9, 6:22 PM MST	Special Weather Statement	PSR		38 min
Aug 9, 10:11 PM MST	Special Weather Statement	PSR	Gila	34 min
Aug 9, 10:40 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	4 hr
Aug 9, 11:51 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	8 hr
Aug 10, 1:40 AM MST	Special Weather Statement	PSR	Maricopa	50 min
Aug 10, 1:54 AM MST	Special Weather Statement	PSR	Maricopa	51 min
Aug 10, 2:15 AM MST	Special Weather Statement	PSR	Maricopa	45 min
Aug 10, 2:23 AM MST	Areal Flood Advisory	PSR	Maricopa, Pinal	2 hr
Aug 10, 4:27 AM MST	Special Weather Statement	PSR	La Paz	48 min
Aug 10, 5:07 AM MST	Special Weather Statement	PSR	La Paz	53 min
Aug 10, 5:09 AM MST	Areal Flood Advisory	PSR	La Paz	2 hr
Aug 10, 5:52 AM MST	Areal Flood Advisory	PSR	Maricopa, Pinal	5 hr
Aug 10, 6:21 AM MST	Special Weather Statement	PSR	La Paz	39 min
Aug 10, 7:39 AM MST	Areal Flood Advisory	PSR	Maricopa, Pinal	3 hr
Aug 10, 8:00 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	3 hr
Aug 10, 8:06 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	4 hr
Aug 10, 8:30 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa, Pinal	7 hr
Aug 10, 9:54 AM MST	Areal Flood Advisory	PSR	La Paz	3 hr
Aug 10, 3:05 PM MST	Areal Flood Warning	PSR	Maricopa, Pinal	7 hr
Aug 10, 4:43 PM MST	Special Weather Statement	PSR		62 min
Aug 10, 4:44 PM MST	Special Weather Statement	PSR		61 min
Aug 10, 4:56 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	49 min
Aug 9, 5:06 PM MST	Areal Flood Advisory	PSR	Riverside	3 hr
Aug 9, 6:09 PM MST	Areal Flood Advisory	PSR	Riverside, San Bernardino	115 min
Aug 10, 3:11 PM MST	Areal Flood Advisory	PSR	Riverside, San Bernardino	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.