Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 81, NWS Phoenix, AZ

August 16, 2021La Paz County, Maricopa County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 16, 2021, 12:49 AM MST for La Paz County, Maricopa County, Arizona. It was in force for 56 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 16, 2021, 12:49 AM MST (07:49 UTC)
Expired: Aug 16, 2021, 1:45 AM MST
In force: 56 min
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties La Paz County, AZ, Maricopa County, AZ

The radar

The Phoenix radar (KIWA), 164 km from the middle of the area, began a volume at 07:50 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, 7.8 hours before the alert went out and 132 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: 1548 J/kg
Mixed-layer CIN: -94 J/kg
Mixed-layer LCL: 2123 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: -22 m²/s²
0-3 km storm-relative helicity: 56 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

382 
WUUS55 KPSR 160749
SVRPSR
AZC012-013-160845-
/O.NEW.KPSR.SV.W.0081.210816T0749Z-210816T0845Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Phoenix AZ
1249 AM MST Mon Aug 16 2021

The National Weather Service in Phoenix has issued a

* Severe Thunderstorm Warning for...
  Northeastern La Paz County in west central Arizona...
  Maricopa County in south central Arizona...

* Until 145 AM MST.

* At 1248 AM MST, a severe thunderstorm was located near Aguila, or
  19 miles west of Wickenburg, moving southwest at 40 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Wickenburg, Alamo Lake, Alamo Lake State Park, Aguila, Wenden and
  Gladden.

This includes US Highway 60 between mile markers 61 and 118.
 
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 3400 11333 3400 11273 3397 11261 3371 11272
      3364 11298 3365 11328 3375 11351 3392 11365
      3423 11363 3431 11353 3429 11336 3432 11334
TIME...MOT...LOC 0748Z 028DEG 33KT 3402 11309 

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

$$

Hirsch

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 15, 7:49 PM MST	Special Weather Statement	PSR	Gila	56 min
Aug 15, 8:26 PM MST	Severe Thunderstorm Warning	PSR	Gila	49 min
Aug 15, 9:14 PM MST	Severe Thunderstorm Warning	PSR	Gila, Maricopa, Pinal	46 min
Aug 15, 9:18 PM MST	Special Weather Statement	PSR	Gila	42 min
Aug 15, 9:58 PM MST	Severe Thunderstorm Warning Considerable damage threat	PSR	Gila, Maricopa, Pinal	47 min
Aug 15, 10:14 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	4 hr
Aug 15, 10:31 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	44 min
Aug 15, 10:45 PM MST	Special Weather Statement	PSR	Pinal	45 min
Aug 15, 10:50 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila, Maricopa, Pinal	6 hr
Aug 15, 10:55 PM MST	Dust Storm Advisory	PSR	Maricopa, Pinal	65 min
Aug 15, 10:58 PM MST	Areal Flood Advisory	PSR	Maricopa, Pinal	3 hr
Aug 15, 11:14 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	46 min
Aug 15, 11:31 PM MST	Special Weather Statement	PSR	Maricopa	44 min
Aug 15, 11:37 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	38 min
Aug 15, 11:44 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	32 min
Aug 15, 11:45 PM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Aug 16, 12:18 AM MST	Special Weather Statement	PSR		42 min
Aug 16, 1:33 AM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz, Maricopa	6 hr
Aug 16, 1:47 AM MST	Special Weather Statement	PSR	La Paz	58 min
Aug 16, 1:54 AM MST	Severe Thunderstorm Warning	PSR	La Paz	66 min
Aug 16, 2:22 AM MST	Special Weather Statement	PSR	La Paz	68 min
Aug 16, 2:53 AM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz	5 hr
Aug 16, 3:08 AM MST	Dust Storm Advisory	PSR	La Paz, Yuma	2 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.