Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 72, NWS Phoenix, AZ

August 14, 2021Gila County, Maricopa County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 14, 2021, 5:51 PM MST for Gila County, Maricopa County, Arizona. It was in force for 24 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 14, 2021, 5:51 PM MST (00:51 UTC)
Expired: Aug 14, 2021, 6:15 PM MST
In force: 24 min
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Gila County, AZ, Maricopa County, AZ

The radar

The Phoenix radar (KIWA), 72 km from the middle of the area, began a volume at 00:53 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, 0.9 hours before the alert went out and 67 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: 1092 J/kg
Mixed-layer CIN: -58 J/kg
Mixed-layer LCL: 1640 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 106 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

152 
WUUS55 KPSR 150051
SVRPSR
AZC007-013-150115-
/O.NEW.KPSR.SV.W.0072.210815T0051Z-210815T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Phoenix AZ
551 PM MST Sat Aug 14 2021

The National Weather Service in Phoenix has issued a

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

* Until 615 PM MST.

* At 551 PM MST, a severe thunderstorm was located near Round Valley,
  moving west at 25 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...
  Round Valley, Ballantine Trailhead, Sycamore Creek, Sunflower, Camp
  Creek, Rio Verde, Horseshoe Reservoir and Seven Springs.

This includes AZ Route 87 between mile markers 209 and 226.
 
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 3401 11144 3376 11142 3370 11177 3402 11189
      3400 11150 3401 11148
TIME...MOT...LOC 0051Z 079DEG 22KT 3384 11154 

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

$$

DH

1 follow-up statement

498 
WWUS55 KPSR 150114
SVSPSR

Severe Weather Statement
National Weather Service Phoenix AZ
614 PM MST Sat Aug 14 2021

AZC007-013-150124-
/O.EXP.KPSR.SV.W.0072.000000T0000Z-210815T0115Z/
Gila AZ-Maricopa AZ-
614 PM MST Sat Aug 14 2021

...THE SEVERE THUNDERSTORM WARNING FOR GILA AND MARICOPA COUNTIES
WILL EXPIRE AT 615 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.

LAT...LON 3401 11144 3376 11142 3370 11177 3402 11189
      3400 11150 3401 11148
TIME...MOT...LOC 0114Z 079DEG 22KT 3382 11168 

$$

DH

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 5:26 PM MST	Special Weather Statement	PSR		49 min
Aug 14, 5:46 PM MST	Special Weather Statement	PSR		44 min
Aug 14, 6:17 PM MST	Special Weather Statement	PSR		43 min
Aug 14, 6:22 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	38 min
Aug 14, 6:33 PM MST	Special Weather Statement	PSR		42 min
Aug 14, 6:36 PM MST	Special Weather Statement	PSR		39 min
Aug 14, 6:45 PM MST	Special Weather Statement	PSR	Maricopa	45 min
Aug 14, 6:53 PM MST	Special Weather Statement	PSR		52 min
Aug 14, 7:17 PM MST	Special Weather Statement	PSR		43 min
Aug 14, 7:19 PM MST	Special Weather Statement	PSR		41 min
Aug 14, 11:13 PM MST	Special Weather Statement	PSR	La Paz	47 min
Aug 14, 11:17 PM MST	Special Weather Statement	PSR	La Paz	43 min
Aug 14, 11:26 PM MST	Special Weather Statement	PSR		64 min
Aug 15, 12:55 AM MST	Special Weather Statement	PSR		65 min
Aug 15, 4:42 AM MST	Areal Flood Advisory	PSR	Maricopa, Yuma	6 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.