Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 23, NWS Phoenix, AZ

July 12, 2021Gila County, Pinal County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Jul 12, 2021, 8:17 PM MST for Gila County, Pinal County, Arizona. It was in force for 43 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 12, 2021, 8:17 PM MST (03:17 UTC)
Expired: Jul 12, 2021, 9:00 PM MST
In force: 43 min
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Gila County, AZ, Pinal County, AZ

The radar

The Phoenix radar (KIWA), 85 km from the middle of the area, began a volume at 03:20 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.

What was reported inside it

Time	Report	Where	Remark
Jul 12, 8:30 PM MST	TSTM WND GST 72	7 Nw Christmas, AZ	MESONET STATION TT418 TONTO PORTABLE #2 (RAWS). TIME ESTIMATED FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Tuscon, AZ (KTUS), launched 00:00Z, 3.3 hours before the alert went out and 107 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: 1102 J/kg
Mixed-layer CIN: -105 J/kg
Mixed-layer LCL: 2775 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

095 
WUUS55 KPSR 130317
SVRPSR
AZC007-021-130400-
/O.NEW.KPSR.SV.W.0023.210713T0317Z-210713T0400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Phoenix AZ
817 PM MST Mon Jul 12 2021

The National Weather Service in Phoenix has issued a

* Severe Thunderstorm Warning for...
  Gila County in east central Arizona...
  Pinal County in southeastern Arizona...

* Until 900 PM MST.

* At 817 PM MST, a severe thunderstorm was located 9 miles north of
  Christmas, moving southwest 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...
  Hayden and Christmas. 

* This includes the following highways...
  AZ Route 77 between mile markers 135 and 141, near mile marker 143,
  and between mile markers 146 and 167.
  AZ Route 177 between mile markers 137 and 162.

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 3314 11056 3315 11063 3308 11070 3307 11073
      3304 11072 3299 11077 3299 11079 3324 11094
      3312 11113 3318 11117 3337 11081 3319 11054
TIME...MOT...LOC 0317Z 045DEG 20KT 3320 11079 

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

SDB

2 follow-up statements

082 
WWUS55 KPSR 130337
SVSPSR

wind

        WWUS55 KPSR 000000 
SVSPSR

Severe Weather Statement
National Weather Service Phoenix AZ
837 PM MST Mon Jul 12 2021

AZC021-130347-
/O.CAN.KPSR.SV.W.0023.000000T0000Z-210713T0400Z/
Pinal AZ-
837 PM MST Mon Jul 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR PINAL COUNTY IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3315 11056 3314 11057 3315 11063 3308 11070
      3307 11073 3304 11072 3299 11077 3299 11079
      3324 11094 3324 11095 3325 11094 3330 11085
      3318 11054
TIME...MOT...LOC 0337Z 045DEG 20KT 3312 11089 

$$

AZC007-130400-
/O.CON.KPSR.SV.W.0023.000000T0000Z-210713T0400Z/
Gila AZ-
837 PM MST Mon Jul 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM MST
FOR GILA COUNTY...

At 837 PM MST, a severe thunderstorm was located near Kearny, or 9
miles northwest of Christmas, moving southwest 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...
Hayden and Christmas. 

This includes the following highways...
AZ Route 77 between mile markers 135 and 141, near mile marker 143,
and between mile markers 146 and 162.
AZ Route 177 between mile markers 137 and 138.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

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 3315 11056 3314 11057 3315 11063 3308 11070
      3307 11073 3304 11072 3299 11077 3299 11079
      3324 11094 3324 11095 3325 11094 3330 11085
      3318 11054
TIME...MOT...LOC 0337Z 045DEG 20KT 3312 11089 

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

SDB

686 
WWUS55 KPSR 130357
SVSPSR

Severe Weather Statement
National Weather Service Phoenix AZ
857 PM MST Mon Jul 12 2021

AZC007-130407-
/O.EXP.KPSR.SV.W.0023.000000T0000Z-210713T0400Z/
Gila AZ-
857 PM MST Mon Jul 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR GILA COUNTY WILL EXPIRE AT 900
PM MST...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with this thunderstorm.

LAT...LON 3315 11056 3314 11057 3315 11063 3308 11070
      3307 11073 3304 11072 3299 11077 3299 11079
      3324 11094 3324 11095 3325 11094 3330 11085
      3318 11054
TIME...MOT...LOC 0357Z 045DEG 20KT 3305 11097 

$$

SDB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 7:37 PM MST	Special Weather Statement	PSR	Gila	38 min
Jul 12, 8:29 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	3 hr
Jul 12, 9:18 PM MST	Special Weather Statement	PSR		42 min
Jul 12, 9:40 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	35 min
Jul 12, 10:05 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	25 min
Jul 12, 10:14 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila, Maricopa	2 hr
Jul 12, 10:28 PM MST	Special Weather Statement	PSR	Maricopa	32 min
Jul 12, 11:35 PM MST	Special Weather Statement	PSR		40 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.