Alert archive / Arizona / Special Weather Statements in 2021

Special Weather Statement, NWS Phoenix, AZ

August 30, 2021

NWS Phoenix, AZ issued this special weather statement at Aug 30, 2021, 3:21 PM MST. It was in force for 24 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 30, 2021, 3:21 PM MST (22:21 UTC)
Expired: Aug 30, 2021, 3:45 PM MST
In force: 24 min
Issued by: NWS Phoenix, AZ
Hail: 0.00 in
Wind: 55

The radar

The Yuma radar (KYUX), 150 km from the middle of the area, began a volume at 22:22 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

San Diego, CA (KNKX), launched 12:00Z, 10.4 hours before the alert went out and 204 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1798 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 1 m²/s²
0-3 km storm-relative helicity: 45 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

011 
WWUS85 KPSR 302221
SPSPSR

Special Weather Statement
National Weather Service Phoenix AZ
321 PM PDT Mon Aug 30 2021
 
CAZ564-570-302245-
Chuckwalla Mountains CA-Chuckwalla Valley CA-
321 PM PDT Mon Aug 30 2021

...A strong thunderstorm will impact portions of Riverside County
through 345 PM PDT...

At 321 PM PDT, Doppler radar was tracking a strong thunderstorm 8
miles east of Desert Center, moving northwest at 5 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.

This includes the following highways...
CA Interstate 10 between mile markers 101 and 117.
CA Route 177 between mile markers 1 and 10.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3377 11514 3363 11522 3368 11548 3368 11549
      3386 11538
TIME...MOT...LOC 2221Z 115DEG 6KT 3375 11526 

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

$$

INS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 29, 5:05 PM MST	Special Weather Statement	PSR		25 min
Aug 29, 5:23 PM MST	Areal Flood Advisory	PSR	La Paz, Maricopa	2 hr
Aug 29, 6:07 PM MST	Special Weather Statement	PSR	Pinal	23 min
Aug 30, 12:42 AM MST	Areal Flood Advisory	PSR	Maricopa, Pinal	4 hr
Aug 30, 1:43 AM MST	Flash Flood Watch	PSR	Gila, La Paz, Maricopa, Pinal, Yuma	3 days
Aug 30, 1:41 PM MST	Special Weather Statement	PSR	La Paz	34 min
Aug 30, 1:55 PM MST	Severe Thunderstorm Warning	PSR	La Paz	50 min
Aug 30, 2:24 PM MST	Areal Flood Advisory	PSR	La Paz, Yuma	3 hr
Aug 30, 2:55 PM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz	4 hr
Aug 30, 3:04 PM MST	Special Weather Statement	PSR	La Paz	26 min
Aug 30, 3:32 PM MST	Special Weather Statement	PSR	La Paz	28 min
Aug 30, 3:47 PM MST	Dust Storm Advisory	PSR	La Paz	58 min
Aug 30, 4:48 PM MST	Special Weather Statement	PSR		42 min
Aug 30, 4:51 PM MST	Special Weather Statement	PSR	Gila	39 min
Aug 30, 4:56 PM MST	Dust Storm Advisory	PSR	Imperial, Riverside, San Bernardino	94 min

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.