Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 113, NWS Phoenix, AZ

September 30, 2021Gila County, Pinal County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Sep 30, 2021, 12:42 AM MST for Gila County, Pinal County, Arizona. It was in force for 48 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: Sep 30, 2021, 12:42 AM MST (07:42 UTC)
Expired: Sep 30, 2021, 1:30 AM MST
In force: 48 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), 88 km from the middle of the area, began a volume at 07:46 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

Tuscon, AZ (KTUS), launched 00:00Z, 7.7 hours before the alert went out and 110 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: 314 J/kg
Mixed-layer CIN: -91 J/kg
Mixed-layer LCL: 2898 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

613 
WUUS55 KPSR 300742
SVRPSR
AZC007-021-300830-
/O.NEW.KPSR.SV.W.0113.210930T0742Z-210930T0830Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Phoenix AZ
1242 AM MST Thu Sep 30 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 130 AM MST.

* At 1241 AM MST, a severe thunderstorm was located near Kearny, or
  11 miles northwest of Hayden, moving east at 20 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 143, and between mile
markers 146 and 168.
AZ Route 177 between mile markers 137 and 165.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3314 11059 3315 11063 3308 11070 3307 11073
      3304 11072 3299 11076 3299 11079 3324 11094
      3316 11108 3326 11111 3335 11066 3328 11054
      3318 11052
TIME...MOT...LOC 0741Z 248DEG 17KT 3310 11095 

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

$$

Iniguez

2 follow-up statements

305 
WWUS55 KPSR 300810
SVSPSR

Severe Weather Statement
National Weather Service Phoenix AZ
110 AM MST Thu Sep 30 2021

AZC021-300819-
/O.CAN.KPSR.SV.W.0113.000000T0000Z-210930T0830Z/
Pinal AZ-
110 AM MST Thu Sep 30 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 3314 11059 3315 11063 3308 11070 3307 11073
      3304 11072 3299 11076 3299 11079 3324 11094
      3329 11093 3334 11069 3327 11057 3318 11052
TIME...MOT...LOC 0809Z 257DEG 22KT 3314 11076 

$$

AZC007-300830-
/O.CON.KPSR.SV.W.0113.000000T0000Z-210930T0830Z/
Gila AZ-
110 AM MST Thu Sep 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 AM MST
FOR GILA COUNTY...

At 109 AM MST, a severe thunderstorm was located near Christmas,
moving east 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 143, and between mile
markers 146 and 167.
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.

&&

LAT...LON 3314 11059 3315 11063 3308 11070 3307 11073
      3304 11072 3299 11076 3299 11079 3324 11094
      3329 11093 3334 11069 3327 11057 3318 11052
TIME...MOT...LOC 0809Z 257DEG 22KT 3314 11076 

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

$$

Iniguez

783 
WWUS55 KPSR 300831
SVSPSR

Severe Weather Statement
National Weather Service Phoenix AZ
131 AM MST Thu Sep 30 2021

AZC007-300840-
/O.EXP.KPSR.SV.W.0113.000000T0000Z-210930T0830Z/
Gila AZ-
131 AM MST Thu Sep 30 2021

...THE SEVERE THUNDERSTORM WARNING FOR GILA COUNTY HAS EXPIRED...
                
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 allowed to expire. Wind gusts up to 
50 mph and penny size hail will still be possible.

LAT...LON 3314 11059 3315 11063 3308 11070 3307 11073
      3304 11072 3299 11076 3299 11079 3324 11094
      3329 11093 3334 11069 3327 11057 3318 11052
TIME...MOT...LOC 0830Z 248DEG 17KT 3318 11066 

$$

Iniguez

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 29, 5:09 PM MST	Special Weather Statement	PSR	Yuma	51 min
Sep 29, 6:34 PM MST	Special Weather Statement	PSR		26 min
Sep 29, 7:36 PM MST	Special Weather Statement	PSR	La Paz	39 min
Sep 29, 8:00 PM MST	Areal Flood Advisory	PSR	Yuma	3 hr
Sep 29, 8:20 PM MST	Special Weather Statement	PSR	La Paz	40 min
Sep 29, 10:10 PM MST	Special Weather Statement	PSR	Pinal	35 min
Sep 29, 10:27 PM MST	Severe Thunderstorm Warning	PSR	Pinal	48 min
Sep 29, 11:02 PM MST	Areal Flood Advisory	PSR	Pinal	3 hr
Sep 29, 11:13 PM MST	Special Weather Statement	PSR	Pinal	32 min
Sep 29, 11:45 PM MST	Special Weather Statement	PSR	Pinal	45 min
Sep 29, 11:55 PM MST	Severe Thunderstorm Warning	PSR	Pinal	35 min
Sep 30, 1:00 AM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Sep 30, 1:30 AM MST	Special Weather Statement	PSR		30 min
Sep 30, 2:47 PM MST	Special Weather Statement	PSR		43 min
Sep 30, 3:39 PM MST	Areal Flood Advisory	PSR	Maricopa	8 hr
Sep 30, 4:21 PM MST	Special Weather Statement	PSR		39 min
Sep 30, 4:26 PM MST	Special Weather Statement	PSR		49 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.