Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 56, NWS Phoenix, AZ

August 12, 2021La Paz County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 12, 2021, 7:25 PM MST for La Paz County, Arizona. It was in force for 50 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 12, 2021, 7:25 PM MST (02:25 UTC)
Expired: Aug 12, 2021, 8:15 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), 151 km from the middle of the area, began a volume at 02:28 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.

What was reported inside it

Time	Report	Where	Remark
Aug 12, 7:40 PM MST	TSTM WND DMG	1 N Quartzsite, AZ	TREES DOWN ON HIGHWAY 95 IN NORTH PART OF QUARTZSITE. BYPASSERS ASSISTED DEPUTY TO REMOVE LARGE TREE BLOCKING HIGHWAY. DEBRIS FROM PROPERTIES BLOWING ON TO RESIDENTIAL STREETS IN QUARTZSITE.
Aug 12, 7:46 PM MST	TSTM WND DMG	5 Ese Brenda, AZ	MULTIPLE SEMI TRUCKS REPORTED BLOWN OVER ON WESTBOUND I-10 EAST OF QUARTZSITE, RESULTING IN CLOSURE OF THE INTERSTATE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Phoenix, AZ (KPSR), launched 00:00Z, 2.4 hours before the alert went out and 194 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: 760 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 1919 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 9 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

009 
WUUS55 KPSR 130225
SVRPSR
AZC012-130315-
/O.NEW.KPSR.SV.W.0056.210813T0225Z-210813T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Phoenix AZ
725 PM MST Thu Aug 12 2021

The National Weather Service in Phoenix has issued a

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

* Until 815 PM MST.

* At 725 PM MST, a severe thunderstorm was located near Brenda, or 32
  miles southeast of Parker, moving southwest at 10 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, Vicksburg, Brenda and Vicksburg Junction. 

This includes the following highways...
AZ Interstate 10 between mile markers 12 and 48.
US Highway 60 between mile markers 31 and 52.
AZ Route 72 between mile markers 39 and 49.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3393 11418 3375 11366 3353 11376 3358 11438
TIME...MOT...LOC 0225Z 037DEG 10KT 3373 11399 

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

$$

Rogers

2 follow-up statements

434 
WWUS55 KPSR 130253
SVSPSR

Severe Weather Statement
National Weather Service Phoenix AZ
753 PM MST Thu Aug 12 2021

AZC012-130315-
/O.CON.KPSR.SV.W.0056.000000T0000Z-210813T0315Z/
La Paz AZ-
753 PM MST Thu Aug 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM MST
FOR CENTRAL LA PAZ COUNTY...

At 753 PM MST, a severe thunderstorm was located near Brenda, or 34
miles southeast of Parker, moving southwest at 10 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 19 and 47.
US Highway 60 between mile markers 31 and 48.
AZ Route 95 between mile markers 99 and 103, and near mile marker
104.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3374 11417 3372 11369 3353 11376 3358 11427
TIME...MOT...LOC 0253Z 037DEG 10KT 3367 11405 

HAIL...0.75IN
WIND...60MPH
 
$$

Rogers

127 
WWUS55 KPSR 130315
SVSPSR

Severe Weather Statement
National Weather Service Phoenix AZ
815 PM MST Thu Aug 12 2021

AZC012-130324-
/O.EXP.KPSR.SV.W.0056.000000T0000Z-210813T0315Z/
La Paz AZ-
815 PM MST Thu Aug 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL LA PAZ COUNTY WILL
EXPIRE AT 815 PM MST...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

LAT...LON 3374 11417 3372 11369 3353 11376 3358 11427
TIME...MOT...LOC 0314Z 037DEG 10KT 3362 11409 

$$

Rogers

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 5:16 PM MST	Special Weather Statement	PSR	Yuma	44 min
Aug 12, 5:17 PM MST	Special Weather Statement	PSR	Yuma	43 min
Aug 12, 5:53 PM MST	Areal Flood Advisory	PSR	Yuma	3 hr
Aug 12, 6:28 PM MST	Special Weather Statement	PSR	La Paz	47 min
Aug 12, 6:30 PM MST	Special Weather Statement	PSR	Yuma	45 min
Aug 12, 6:42 PM MST	Areal Flood Advisory	PSR	La Paz	3 hr
Aug 12, 6:47 PM MST	Areal Flood Advisory	PSR	Maricopa, Yuma	3 hr
Aug 12, 6:50 PM MST	Severe Thunderstorm Warning	PSR	Yuma	40 min
Aug 12, 6:52 PM MST	Severe Thunderstorm Warning	PSR	La Paz	38 min
Aug 12, 7:16 PM MST	Flash Flood Warning Considerable damage threat	PSR	Yuma	4 hr
Aug 12, 7:42 PM MST	Areal Flood Advisory	PSR	La Paz, Yuma	3 hr
Aug 12, 7:56 PM MST	Special Weather Statement	PSR	La Paz	49 min
Aug 12, 8:05 PM MST	Dust Storm Advisory	PSR	La Paz, Yuma	55 min
Aug 12, 8:48 PM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz, Yuma	4 hr
Aug 13, 2:50 PM MST	Special Weather Statement	PSR	Gila	40 min
Aug 13, 3:30 PM MST	Severe Thunderstorm Warning	PSR	Gila	45 min
Aug 13, 3:36 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	4 hr
Aug 13, 4:12 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	4 hr
Aug 13, 4:14 PM MST	Special Weather Statement	PSR	Gila	46 min
Aug 13, 4:34 PM MST	Severe Thunderstorm Warning	PSR	Gila, Maricopa, Pinal	41 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.