Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 124, NWS Phoenix, AZ

October 5, 2021Maricopa County, Pinal County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Oct 5, 2021, 5:19 PM MST for Maricopa County, Pinal County, Arizona. It was in force for 41 min. 5 reports 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: Oct 5, 2021, 5:19 PM MST (00:19 UTC)
Expired: Oct 5, 2021, 6:00 PM MST
In force: 41 min
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Tornado: Possible
Damage threat: Considerable
Hail: 2.0 in
Wind: 60.0 mph

Counties Maricopa County, AZ, Pinal County, AZ

The radar

The Phoenix radar (KIWA), 53 km from the middle of the area, began a volume at 00:20 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
Oct 5, 5:46 PM MST	HAIL 1	6 W Ahwatukee Foothills, AZ	*DELAYED REPORT* STORM CHASER REPORTED ESTIMATED 1 INCH HAIL WHILE DRIVING ON LOOP-202.
Oct 5, 5:58 PM MST	HAIL 0.88	5 Nnw Ahwatukee Foothil, AZ	HAIL JUST LESS THAN 1 INCH DIAMETER FELL FOR ROUGHLY 10 MINUTES, BASED ON A SOCIAL MEDIA REPORT.
Oct 5, 6:02 PM MST	HAIL 1	4 Ssw Sky Harbor Airpor, AZ	PHOTO ON SOCIAL MEDIA OF A 1 INCH DIAMETER HAIL STONE.
Oct 5, 6:03 PM MST	HAIL 1.25	3 Ssw Sky Harbor Airpor, AZ	*DELAYED REPORT* VIDEO SHOWS HAIL FALLING IN HERMOSO PARK. LARGEST HAIL ESTIMATED AT 1.25 INCHES IN DIAMETER.
Oct 5, 6:04 PM MST	HAIL 1.5	3 S Sky Harbor Airport, AZ	SOCIAL MEDIA PHOTO FROM LOCAL JOURNALIST SHOWED HAIL IN HIS HAND. HE ESTIMATED THE SIZE AT 1.5 INCHES IN DIAMETER. HAIL FELL FOR AROUND 5 MINUTES.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Oct 5, 11:46 AM MST	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Tuscon, AZ (KTUS), launched 00:00Z, 0.3 hours before the alert went out and 167 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: 364 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 2251 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: -16 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

626 
WUUS55 KPSR 060019
SVRPSR
AZC013-021-060100-
/O.NEW.KPSR.SV.W.0124.211006T0019Z-211006T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Phoenix AZ
519 PM MST Tue Oct 5 2021

The National Weather Service in Phoenix has issued a

* Severe Thunderstorm Warning for...
  Maricopa County in south central Arizona...
  Pinal County in southeastern Arizona...

* Until 600 PM MST.

* At 518 PM MST, a severe thunderstorm was located 10 miles south of
  Estrella Mountain Park, or 16 miles south of Avondale, moving east
  at 35 mph.

  HAZARD...Two inch hail and 60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           wind damage to roofs, siding, and trees.

* Locations impacted include...
  Phoenix, Chandler, Avondale, Goodyear, Sun Lakes, South Mountain
  Park, Bapchule, South Phoenix, Rainbow Valley, Firebird Lake,
  Santan and Komatke.

This includes the following highways...
AZ Interstate 10 between mile markers 159 and 174.
AZ Route 87 between mile markers 155 and 160.
AZ Route 202 between mile markers 53 and 55.

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 3305 11241 3324 11249 3341 11204 3315 11177
TIME...MOT...LOC 0018Z 250DEG 29KT 3318 11230 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...2.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

SDB

2 follow-up statements

206 
WWUS55 KPSR 060038
SVSPSR

Severe Weather Statement
National Weather Service Phoenix AZ
538 PM MST Tue Oct 5 2021

AZC013-021-060100-
/O.CON.KPSR.SV.W.0124.000000T0000Z-211006T0100Z/
Maricopa AZ-Pinal AZ-
538 PM MST Tue Oct 5 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM MST
FOR MARICOPA AND PINAL COUNTIES...

At 538 PM MST, a severe thunderstorm was located 7 miles southwest of
South Mountain Park, or 10 miles south of Laveen, moving northeast at
30 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

Locations impacted include...
Phoenix, Chandler, Avondale, Sun Lakes, South Mountain Park, South
Phoenix, Firebird Lake and Komatke.

This includes the following highways...
AZ Interstate 10 between mile markers 159 and 168.
AZ Route 202 between mile markers 53 and 55.
AZ Route 347 between mile markers 184 and 189.

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 11227 3329 11236 3341 11204 3322 11185
TIME...MOT...LOC 0038Z 244DEG 28KT 3328 11218 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

SDB

767 
WWUS55 KPSR 060049
SVSPSR

Severe Weather Statement
National Weather Service Phoenix AZ
549 PM MST Tue Oct 5 2021

AZC013-021-060100-
/O.CON.KPSR.SV.W.0124.000000T0000Z-211006T0100Z/
Maricopa AZ-Pinal AZ-
549 PM MST Tue Oct 5 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM MST
FOR MARICOPA AND PINAL COUNTIES...

At 549 PM MST, a severe thunderstorm was located near South Mountain
Park, or 7 miles south of Laveen, moving east at 30 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Phoenix, Chandler, South Mountain Park, South Phoenix and Komatke. 

This includes the following highways...
AZ Interstate 10 between mile markers 159 and 162.
AZ Route 202 between mile markers 53 and 55.

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 3321 11219 3332 11229 3341 11204 3329 11192
TIME...MOT...LOC 0049Z 247DEG 26KT 3331 11212 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

SDB

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 5, 5:05 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	40 min
Oct 5, 5:24 PM MST	Severe Thunderstorm Warning	PSR	Gila	51 min
Oct 5, 5:41 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	34 min
Oct 5, 5:46 PM MST	Special Weather Statement	PSR	Gila	44 min
Oct 5, 6:00 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	45 min
Oct 5, 6:25 PM MST	Areal Flood Warning	PSR	Gila	110 min
Oct 5, 6:40 PM MST	Special Weather Statement	PSR		35 min
Oct 5, 7:17 PM MST	Special Weather Statement	PSR	La Paz	43 min
Oct 5, 7:38 PM MST	Severe Thunderstorm Warning	PSR	La Paz, Maricopa	37 min
Oct 5, 7:50 PM MST	Areal Flood Advisory	PSR	La Paz	3 hr
Oct 5, 8:16 PM MST	Special Weather Statement	PSR		29 min
Oct 5, 8:23 PM MST	Areal Flood Warning	PSR	Gila	10 hr
Oct 6, 7:43 AM MST	Areal Flood Warning	PSR	Gila	14 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.