Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 28, NWS Phoenix, AZ

July 15, 2021Maricopa County, Pinal County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Jul 15, 2021, 5:12 PM MST for Maricopa County, Pinal County, Arizona. It was in force for 48 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 15, 2021, 5:12 PM MST (00:12 UTC)
Expired: Jul 15, 2021, 6:00 PM MST
In force: 48 min
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Maricopa County, AZ, Pinal County, AZ

The radar

The Phoenix radar (KIWA), 12 km from the middle of the area, began a volume at 00:12 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 15, 5:12 PM MST	TSTM WND DMG	3 Nnw East Mesa, AZ	*DELAYED REPORT* CARPORT AND PARTIAL ROOF TORN OFF HOME AND IN THE STREET. AT LEAST 25 HOMES IN TOTAL IN THE APACHE WELLS COMMUNITY REPORTEDLY SUFFERED SOME FORM OF STORM DAMAGE. TIME ESTIMATED FROM RADAR AND NEARBY FALCON FIELD ASOS MEASUREMENT OF A 72 MP

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

The nearest sounding before it

Phoenix, AZ (KPSR), launched 00:00Z, 0.2 hours before the alert went out and 29 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: 1128 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 2310 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: 28 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

236 
WUUS55 KPSR 160012
SVRPSR
AZC013-021-160100-
/O.NEW.KPSR.SV.W.0028.210716T0012Z-210716T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Phoenix AZ
512 PM MST Thu Jul 15 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 511 PM MST, a severe thunderstorm was located over Superstition
  Springs Mall, or over East Mesa, moving southeast at 20 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Mesa, Chandler, Gilbert, Tempe, Apache Junction, Gold Canyon, East
  Mesa, Queen Creek, Gold Camp, Lost Dutchman State Park, Goldfield,
  Usery Mountain Park, San Tan Village Mall, San Tan Valley and
  Seville.

* This includes the following highways...
  US Highway 60 between mile markers 175 and 206.
  AZ Route 87 between mile markers 161 and 173, and between mile
  markers 195 and 199.
  AZ Route 202 between mile markers 23 and 49.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3342 11194 3341 11179 3346 11171 3357 11163
      3364 11159 3351 11132 3336 11138 3323 11147
      3312 11163 3321 11184
TIME...MOT...LOC 0011Z 310DEG 17KT 3340 11169 

HAIL...0.75IN
WIND...60MPH
 
$$

JS

2 follow-up statements

191 
WWUS55 KPSR 160024
SVSPSR

wind

        WWUS55 KPSR 000000 
SVSPSR

Severe Weather Statement
National Weather Service Phoenix AZ
524 PM MST Thu Jul 15 2021

AZC013-021-160100-
/O.CON.KPSR.SV.W.0028.000000T0000Z-210716T0100Z/
Maricopa AZ-Pinal AZ-
524 PM MST Thu Jul 15 2021

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

At 523 PM MST, a severe thunderstorm was located near Superstition
Springs Mall, or near East Mesa, moving southeast at 20 mph.

HAZARD...70 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Mesa, Chandler, Gilbert, Tempe, Apache Junction, Gold Canyon, East
Mesa, Queen Creek, Gold Camp, Lost Dutchman State Park, Goldfield,
Usery Mountain Park, San Tan Village Mall, San Tan Valley and
Seville.

This includes the following highways...
US Highway 60 between mile markers 175 and 206.
AZ Route 87 between mile markers 161 and 173, and between mile
markers 195 and 199.
AZ Route 202 between mile markers 23 and 49.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3342 11194 3341 11179 3346 11171 3357 11163
      3364 11159 3351 11132 3336 11138 3323 11147
      3312 11163 3321 11184
TIME...MOT...LOC 0023Z 310DEG 17KT 3336 11164 

HAIL...0.75IN
WIND...70MPH
 
$$

JS

478 
WWUS55 KPSR 160052
SVSPSR

wind

        WWUS55 KPSR 000000 
SVSPSR

Severe Weather Statement
National Weather Service Phoenix AZ
552 PM MST Thu Jul 15 2021

AZC013-021-160100-
/O.CON.KPSR.SV.W.0028.000000T0000Z-210716T0100Z/
Maricopa AZ-Pinal AZ-
552 PM MST Thu Jul 15 2021

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

At 552 PM MST, a severe thunderstorm was located 7 miles southwest of
Gold Canyon, moving southeast at 20 mph.

HAZARD...70 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Mesa, Chandler, Gilbert, Tempe, Apache Junction, Gold Canyon, East
Mesa, Queen Creek, Gold Camp, Lost Dutchman State Park, Goldfield,
Usery Mountain Park, San Tan Village Mall, San Tan Valley and
Seville.

This includes the following highways...
US Highway 60 between mile markers 175 and 206.
AZ Route 87 between mile markers 161 and 173, and between mile
markers 195 and 199.
AZ Route 202 between mile markers 23 and 49.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3342 11194 3341 11179 3346 11171 3357 11163
      3364 11159 3351 11132 3336 11138 3323 11147
      3312 11163 3321 11184
TIME...MOT...LOC 0052Z 310DEG 17KT 3327 11151 

HAIL...0.75IN
WIND...70MPH
 
$$

JS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 15, 5:06 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	4 hr
Jul 15, 5:07 PM MST	Special Weather Statement	PSR		38 min
Jul 15, 5:33 PM MST	Special Weather Statement	PSR	La Paz	42 min
Jul 15, 5:43 PM MST	Special Weather Statement	PSR		47 min
Jul 15, 6:00 PM MST	Areal Flood Advisory	PSR	Maricopa, Pinal	3 hr
Jul 15, 6:08 PM MST	Special Weather Statement	PSR	Pinal	52 min
Jul 16, 8:54 AM MST	Special Weather Statement	PSR	Pinal	36 min
Jul 16, 9:48 AM MST	Special Weather Statement	PSR		27 min
Jul 16, 11:21 AM MST	Areal Flood Advisory	PSR	Maricopa	111 min
Jul 16, 2:56 PM MST	Special Weather Statement	PSR	Gila	34 min
Jul 16, 3:27 PM MST	Special Weather Statement	PSR		33 min
Jul 16, 3:37 PM MST	Special Weather Statement	PSR	Gila	38 min
Jul 16, 4:39 PM MST	Special Weather Statement	PSR	Gila	36 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.