Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 13, NWS Phoenix, AZ

July 9, 2021Pinal County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Jul 9, 2021, 11:19 PM MST for Pinal County, Arizona. It was in force for 26 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 9, 2021, 11:19 PM MST (06:19 UTC)
Expired: Jul 9, 2021, 11:45 PM MST
In force: 26 min
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

County Pinal County, AZ

The radar

The Phoenix radar (KIWA), 53 km from the middle of the area, began a volume at 06:20 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, 6.3 hours before the alert went out and 61 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: 1011 J/kg
Mixed-layer CIN: -182 J/kg
Mixed-layer LCL: 3280 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: -35 m²/s²
0-3 km storm-relative helicity: 54 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

013 
WUUS55 KPSR 100619
SVRPSR
AZC021-100645-
/O.NEW.KPSR.SV.W.0013.210710T0619Z-210710T0645Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Phoenix AZ
1119 PM MST Fri Jul 9 2021

The National Weather Service in Phoenix has issued a

* Severe Thunderstorm Warning for...
  Pinal County in southeastern Arizona...

* Until 1145 PM MST.

* At 1119 PM MST, a severe thunderstorm was located 8 miles south of
  Olberg, or 9 miles northwest of Casa Grande, moving southwest at 20
  mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Casa Grande and Stanfield. 

* This includes the following highways...
  AZ Interstate 8 between mile markers 156 and 169.
  AZ Route 347 between mile markers 161 and 170.

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.

&&

LAT...LON 3291 11219 3310 11192 3298 11174 3279 11184
      3279 11187 3277 11189 3277 11198
TIME...MOT...LOC 0619Z 028DEG 16KT 3297 11188 

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

SDB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 5:36 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	6 hr
Jul 9, 5:36 PM MST	Special Weather Statement	PSR	Gila	24 min
Jul 9, 6:23 PM MST	Special Weather Statement	PSR		52 min
Jul 9, 7:45 PM MST	Special Weather Statement	PSR		30 min
Jul 9, 8:15 PM MST	Severe Thunderstorm Warning	PSR	Gila	45 min
Jul 9, 8:58 PM MST	Severe Thunderstorm Warning	PSR	Gila, Maricopa, Pinal	47 min
Jul 9, 9:18 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	4 hr
Jul 9, 9:18 PM MST	Special Weather Statement	PSR	Pinal	42 min
Jul 9, 9:32 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila, Pinal	4 hr
Jul 9, 9:39 PM MST	Severe Thunderstorm Warning	PSR	Gila, Maricopa, Pinal	36 min
Jul 9, 9:54 PM MST	Dust Storm Advisory	PSR	Maricopa, Pinal	51 min
Jul 9, 10:06 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	39 min
Jul 9, 10:21 PM MST	Dust Storm Warning	PSR	Maricopa, Pinal	54 min
Jul 9, 10:30 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	45 min
Jul 9, 10:32 PM MST	Flash Flood Warning Considerable damage threat	PSR	Pinal	4 hr
Jul 9, 10:44 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	31 min
Jul 9, 10:52 PM MST	Areal Flood Advisory	PSR	Maricopa, Pinal	3 hr
Jul 9, 11:12 PM MST	Dust Storm Advisory	PSR	Maricopa	63 min
Jul 9, 11:15 PM MST	Dust Storm Warning	PSR	Maricopa, Pinal	60 min
Jul 9, 11:22 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	38 min
Jul 9, 11:31 PM MST	Dust Storm Advisory	PSR	Maricopa	44 min
Jul 9, 11:33 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa, Pinal	4 hr
Jul 10, 1:02 AM MST	Special Weather Statement	PSR	Yuma	28 min
Jul 10, 1:57 PM MST	Blowing Dust Advisory	PSR	Maricopa, Pinal	9 hr
Jul 10, 2:27 PM MST	Special Weather Statement	PSR	Gila	48 min
Jul 10, 3:15 PM MST	Special Weather Statement	PSR	Gila	45 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.