Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 34, NWS Phoenix, AZ

July 22, 2021Maricopa County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Jul 22, 2021, 3:58 PM MST for Maricopa County, Arizona. It was in force for 33 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: Jul 22, 2021, 3:58 PM MST (22:58 UTC)
Expired: Jul 22, 2021, 4:31 PM MST
In force: 33 min
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Maricopa County, AZ

The radar

The Phoenix radar (KIWA), 97 km from the middle of the area, began a volume at 23:00 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, 11.0 hours before the alert went out and 80 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: 442 J/kg
Mixed-layer CIN: -352 J/kg
Mixed-layer LCL: 1914 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 1 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.

021 
WUUS55 KPSR 222258
SVRPSR
AZC013-222345-
/O.NEW.KPSR.SV.W.0034.210722T2258Z-210722T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Phoenix AZ
358 PM MST Thu Jul 22 2021

The National Weather Service in Phoenix has issued a

* Severe Thunderstorm Warning for...
  Maricopa County in south central Arizona...

* Until 445 PM MST.

* At 357 PM MST, a severe thunderstorm was located over Gila Bend,
  moving northwest at 20 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Buckeye, Gila Bend, Gila Bend Auxiliary Field, Bosque and Cotton
  Center.

* This includes the following highways...
  AZ Interstate 8 between mile markers 108 and 134.
  AZ Route 238 between mile markers 1 and 12.
  AZ Route 85 between mile markers 1 and 10, and between mile markers
  119 and 142.

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 3287 11243 3274 11273 3315 11304 3327 11260
TIME...MOT...LOC 2257Z 154DEG 19KT 3295 11265 

HAIL...<.75IN
WIND...60MPH
 
$$

Iniguez

1 follow-up statement

580 
WWUS55 KPSR 222331
SVSPSR

wind

        WWUS55 KPSR 000000 
SVSPSR

Severe Weather Statement
National Weather Service Phoenix AZ
431 PM MST Thu Jul 22 2021

AZC013-222341-
/O.CAN.KPSR.SV.W.0034.000000T0000Z-210722T2345Z/
Maricopa AZ-
431 PM MST Thu Jul 22 2021

...THE SEVERE THUNDERSTORM WARNING FOR MARICOPA COUNTY IS
CANCELLED...
                
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 has been cancelled.  However gusty winds up 
to 35 mph are still possible with this thunderstorm.

LAT...LON 3287 11243 3274 11273 3315 11304 3327 11260
TIME...MOT...LOC 2330Z 154DEG 19KT 3311 11274 

$$

Iniguez

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 5:37 PM MST	Special Weather Statement	PSR	Yuma	38 min
Jul 21, 5:41 PM MST	Special Weather Statement	PSR		49 min
Jul 21, 6:18 PM MST	Severe Thunderstorm Warning	PSR	La Paz, Yuma	42 min
Jul 21, 6:20 PM MST	Special Weather Statement	PSR	Gila	40 min
Jul 21, 6:47 PM MST	Special Weather Statement	PSR		43 min
Jul 21, 6:59 PM MST	Special Weather Statement	PSR	Yuma	46 min
Jul 21, 7:06 PM MST	Areal Flood Advisory	PSR	Gila	3 hr
Jul 21, 7:10 PM MST	Special Weather Statement	PSR	La Paz	50 min
Jul 21, 7:17 PM MST	Areal Flood Advisory	PSR	Yuma	44 min
Jul 21, 7:40 PM MST	Dust Storm Warning	PSR	Yuma	35 min
Jul 21, 8:01 PM MST	Flash Flood Warning Considerable damage threat	PSR	Yuma	4 hr
Jul 21, 8:13 PM MST	Dust Storm Advisory	PSR	Yuma	47 min
Jul 21, 9:06 PM MST	Dust Storm Advisory	PSR	Maricopa, Pinal	39 min
Jul 21, 10:06 PM MST	Dust Storm Advisory	PSR	Maricopa, Pinal	39 min
Jul 21, 10:11 PM MST	Special Weather Statement	PSR	Pinal	49 min
Jul 21, 10:23 PM MST	Special Weather Statement	PSR	Maricopa	37 min
Jul 21, 10:25 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	16 min
Jul 21, 10:39 PM MST	Special Weather Statement	PSR		36 min
Jul 21, 10:51 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	24 min
Jul 21, 11:12 PM MST	Special Weather Statement	PSR		48 min
Jul 21, 11:15 PM MST	Special Weather Statement	PSR	Pinal	45 min
Jul 22, 12:28 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	4 hr
Jul 22, 12:32 AM MST	Areal Flood Advisory	PSR	Maricopa	118 min
Jul 22, 3:06 PM MST	Special Weather Statement	PSR		54 min
Jul 22, 3:43 PM MST	Special Weather Statement	PSR	Maricopa	47 min
Jul 22, 4:30 PM MST	Dust Storm Advisory	PSR	Yuma	41 min
Jul 22, 4:53 PM MST	Areal Flood Advisory	PSR	Maricopa	3 hr

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.