Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 101, NWS Phoenix, AZ

August 30, 2021La Paz County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 30, 2021, 1:55 PM MST for La Paz County, Arizona. It was in force for 50 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, 1:55 PM MST (20:55 UTC)
Expired: Aug 30, 2021, 2:45 PM MST
In force: 50 min
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County La Paz County, AZ

The radar

The Yuma radar (KYUX), 142 km from the middle of the area, began a volume at 20:57 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, 8.9 hours before the alert went out and 190 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: 126 J/kg
Mixed-layer CIN: -355 J/kg
Mixed-layer LCL: 2569 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: -25 m²/s²
0-3 km storm-relative helicity: 59 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

010 
WUUS55 KPSR 302055
SVRPSR
AZC012-302145-
/O.NEW.KPSR.SV.W.0101.210830T2055Z-210830T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Phoenix AZ
155 PM MST Mon Aug 30 2021

The National Weather Service in Phoenix has issued a

* Severe Thunderstorm Warning for...
  Central La Paz County in west central Arizona...

* Until 245 PM MST.

* At 155 PM MST, a severe thunderstorm was located near Brenda, or 35
  miles southeast of Parker, moving west at 5 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Quartzsite and Brenda. 

This includes the following highways...
AZ Interstate 10 between mile markers 18 and 41.
US Highway 60 between mile markers 31 and 44.
AZ Route 95 between mile markers 100 and 112.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3372 11379 3348 11391 3350 11409 3362 11426
      3387 11415
TIME...MOT...LOC 2055Z 108DEG 6KT 3367 11400 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

INS

2 follow-up statements

776 
WWUS55 KPSR 302116
SVSPSR

Severe Weather Statement
National Weather Service Phoenix AZ
216 PM MST Mon Aug 30 2021

AZC012-302145-
/O.CON.KPSR.SV.W.0101.000000T0000Z-210830T2145Z/
La Paz AZ-
216 PM MST Mon Aug 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM MST
FOR CENTRAL LA PAZ COUNTY...

At 216 PM MST, a severe thunderstorm was located near Brenda, or 33
miles southeast of Parker, moving west at 5 mph.

HAZARD...60 mph wind gusts and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Quartzsite and Brenda. 

This includes the following highways...
AZ Interstate 10 between mile markers 18 and 41.
US Highway 60 between mile markers 31 and 44.
AZ Route 95 between mile markers 100 and 112.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3372 11379 3348 11391 3350 11409 3362 11426
      3387 11415
TIME...MOT...LOC 2116Z 108DEG 6KT 3368 11404 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

INS

323 
WWUS55 KPSR 302144
SVSPSR

Severe Weather Statement
National Weather Service Phoenix AZ
244 PM MST Mon Aug 30 2021

AZC012-302153-
/O.EXP.KPSR.SV.W.0101.000000T0000Z-210830T2145Z/
La Paz AZ-
244 PM MST Mon Aug 30 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL LA PAZ COUNTY WILL
EXPIRE AT 245 PM MST...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with this thunderstorm.

LAT...LON 3372 11379 3348 11391 3350 11409 3362 11426
      3387 11415
TIME...MOT...LOC 2143Z 108DEG 6KT 3369 11409 

$$

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, 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, 3:21 PM MST	Special Weather Statement	PSR		24 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

Nearby

Severe Thunderstorm Warnings in Arizona, 2021 Every severe thunderstorm warning 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.