Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 55, NWS Phoenix, AZ

August 12, 2021La Paz County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 12, 2021, 6:52 PM MST for La Paz County, Arizona. It was in force for 38 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, 6:52 PM MST (01:52 UTC)
Expired
Aug 12, 2021, 7:30 PM MST
In force
38 min
Issued by
NWS Phoenix, AZ
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County La Paz County, AZ

The radar

The Yuma radar (KYUX), 177 km from the middle of the area, began a volume at 01:55 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, 1.9 hours before the alert went out and 193 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-pSkew-T log-p diagram, Phoenix, AZ at 00:00Z on 2021-08-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 760 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Phoenix, AZ at 00:00Z on 2021-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 13 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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.

179 
WUUS55 KPSR 130152
SVRPSR
AZC012-130230-
/O.NEW.KPSR.SV.W.0055.210813T0152Z-210813T0230Z/

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

The National Weather Service in Phoenix has issued a

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

* Until 730 PM MST.

* At 652 PM MST, a severe thunderstorm was located near Bouse, or 21
  miles southeast of Parker, moving southwest at 15 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Bouse.

This includes AZ Route 72 between mile markers 19 and 41.
 
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 3412 11398 3396 11375 3373 11384 3393 11419
TIME...MOT...LOC 0152Z 037DEG 11KT 3400 11394 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Rogers
2 follow-up statements
530 
WWUS55 KPSR 130213
SVSPSR

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

AZC012-130230-
/O.CON.KPSR.SV.W.0055.000000T0000Z-210813T0230Z/
La Paz AZ-
713 PM MST Thu Aug 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM MST
FOR NORTH CENTRAL LA PAZ COUNTY...

At 713 PM MST, a severe thunderstorm was located over Bouse, or 20
miles southeast of Parker, moving southwest at 15 mph.

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

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Bouse.

This includes AZ Route 72 between mile markers 19 and 41.
 
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 3412 11398 3396 11375 3373 11384 3393 11419
TIME...MOT...LOC 0213Z 037DEG 11KT 3395 11399 

HAIL...1.00IN
WIND...60MPH
 
$$

Rogers
501 
WWUS55 KPSR 130228
SVSPSR

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

AZC012-130238-
/O.EXP.KPSR.SV.W.0055.000000T0000Z-210813T0230Z/
La Paz AZ-
728 PM MST Thu Aug 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL LA PAZ COUNTY
WILL EXPIRE AT 730 PM MST...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

LAT...LON 3412 11398 3396 11375 3373 11384 3393 11419
TIME...MOT...LOC 0228Z 037DEG 11KT 3392 11402 

$$

Rogers

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 12, 5:16 PM MSTSpecial Weather StatementPSRYuma44 min
Aug 12, 5:17 PM MSTSpecial Weather StatementPSRYuma43 min
Aug 12, 5:53 PM MSTAreal Flood AdvisoryPSRYuma3 hr
Aug 12, 6:28 PM MSTSpecial Weather StatementPSRLa Paz47 min
Aug 12, 6:30 PM MSTSpecial Weather StatementPSRYuma45 min
Aug 12, 6:42 PM MSTAreal Flood AdvisoryPSRLa Paz3 hr
Aug 12, 6:47 PM MSTAreal Flood AdvisoryPSRMaricopa, Yuma3 hr
Aug 12, 6:50 PM MSTSevere Thunderstorm WarningPSRYuma40 min
Aug 12, 7:16 PM MSTFlash Flood Warning Considerable damage threatPSRYuma4 hr
Aug 12, 7:25 PM MSTSevere Thunderstorm WarningPSRLa Paz50 min
Aug 12, 7:42 PM MSTAreal Flood AdvisoryPSRLa Paz, Yuma3 hr
Aug 12, 7:56 PM MSTSpecial Weather StatementPSRLa Paz49 min
Aug 12, 8:05 PM MSTDust Storm AdvisoryPSRLa Paz, Yuma55 min
Aug 12, 8:48 PM MSTFlash Flood Warning Considerable damage threatPSRLa Paz, Yuma4 hr
Aug 13, 2:50 PM MSTSpecial Weather StatementPSRGila40 min
Aug 13, 3:30 PM MSTSevere Thunderstorm WarningPSRGila45 min
Aug 13, 3:36 PM MSTFlash Flood Warning Considerable damage threatPSRGila4 hr
Aug 13, 4:12 PM MSTFlash Flood Warning Considerable damage threatPSRGila4 hr
Aug 13, 4:14 PM MSTSpecial Weather StatementPSRGila46 min
Aug 13, 4:34 PM MSTSevere Thunderstorm WarningPSRGila, Maricopa, Pinal41 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2021Every 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.