Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 26, NWS Phoenix, AZ

July 15, 2021Maricopa County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Jul 15, 2021, 4:26 PM MST for Maricopa County, Arizona. It was in force for 49 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 15, 2021, 4:26 PM MST (23:26 UTC)
Expired
Jul 15, 2021, 5:15 PM MST
In force
49 min
Issued by
NWS Phoenix, AZ
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Maricopa County, AZ

The radar

The Phoenix radar (KIWA), 117 km from the middle of the area, began a volume at 23:26 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 12:00Z, 11.4 hours before the alert went out and 86 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-pSkew-T log-p diagram, Phoenix, AZ at 12:00Z on 2021-07-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 138 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Phoenix, AZ at 12:00Z on 2021-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
138 J/kg
Mixed-layer CIN
-210 J/kg
Mixed-layer LCL
2002 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
52 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

410 
WUUS55 KPSR 152326
SVRPSR
AZC013-160015-
/O.NEW.KPSR.SV.W.0026.210715T2326Z-210716T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Phoenix AZ
426 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...

* Until 515 PM MST.

* At 426 PM MST, a severe thunderstorm was located near Wickenburg,
  and is nearly stationary.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Wickenburg.

* This includes the following highways...
  US Highway 60 between mile markers 107 and 120.
  AZ Route 74 near mile marker 1.

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 3398 11269 3393 11249 3388 11255 3384 11269
      3387 11275 3393 11281 3401 11276
TIME...MOT...LOC 2326Z 308DEG 2KT 3395 11268 

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

JS
2 follow-up statements
099 
WWUS55 KPSR 152346
SVSPSR

wind

        WWUS55 KPSR 000000 
SVSPSR

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

AZC013-160015-
/O.CON.KPSR.SV.W.0026.000000T0000Z-210716T0015Z/
Maricopa AZ-
446 PM MST Thu Jul 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM MST
FOR MARICOPA COUNTY...

At 446 PM MST, a severe thunderstorm was located near Wickenburg, and
is nearly stationary.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Wickenburg.

This includes the following highways...
US Highway 60 between mile markers 107 and 120.
AZ Route 74 near mile marker 1.

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 3398 11269 3393 11249 3388 11255 3384 11269
      3387 11275 3393 11281 3401 11276
TIME...MOT...LOC 2346Z 308DEG 2KT 3394 11267 

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

JS
550 
WWUS55 KPSR 160013
SVSPSR

wind

        WWUS55 KPSR 000000 
SVSPSR

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

AZC013-160023-
/O.EXP.KPSR.SV.W.0026.000000T0000Z-210716T0015Z/
Maricopa AZ-
513 PM MST Thu Jul 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR MARICOPA COUNTY WILL EXPIRE AT
515 PM MST...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning will be allowed to expire.

LAT...LON 3398 11269 3393 11249 3388 11255 3384 11269
      3387 11275 3393 11281 3401 11276
TIME...MOT...LOC 0013Z 308DEG 2KT 3393 11266 

$$

JS

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 14, 5:17 PM MSTSpecial Weather StatementPSR43 min
Jul 14, 5:35 PM MSTSpecial Weather StatementPSRLa Paz40 min
Jul 14, 6:02 PM MSTSpecial Weather StatementPSR43 min
Jul 14, 6:06 PM MSTSpecial Weather StatementPSRLa Paz39 min
Jul 14, 6:16 PM MSTSpecial Weather StatementPSR44 min
Jul 14, 6:23 PM MSTFlash Flood Warning Considerable damage threatPSRMaricopa4 hr
Jul 14, 6:35 PM MSTAreal Flood AdvisoryPSRLa Paz115 min
Jul 14, 6:38 PM MSTAreal Flood AdvisoryPSRMaricopa3 hr
Jul 14, 6:48 PM MSTSpecial Weather StatementPSR42 min
Jul 14, 7:03 PM MSTSpecial Weather StatementPSRMaricopa42 min
Jul 14, 7:32 PM MSTSpecial Weather StatementPSR28 min
Jul 14, 7:51 PM MSTSpecial Weather StatementPSR39 min
Jul 14, 8:04 PM MSTAreal Flood AdvisoryPSRLa Paz, Maricopa3 hr
Jul 14, 8:10 PM MSTAreal Flood AdvisoryPSRMaricopa, Yuma3 hr
Jul 14, 8:31 PM MSTFlash Flood Warning Considerable damage threatPSRLa Paz, Maricopa5 hr
Jul 14, 9:21 PM MSTSpecial Weather StatementPSR39 min
Jul 14, 9:35 PM MSTSpecial Weather StatementPSRLa Paz40 min
Jul 14, 9:52 PM MSTAreal Flood AdvisoryPSRLa Paz, Maricopa38 min
Jul 14, 10:30 PM MSTFlash Flood Warning Considerable damage threatPSRLa Paz, Maricopa4 hr
Jul 15, 5:14 AM MSTSpecial Weather StatementPSRPinal46 min
Jul 15, 5:18 AM MSTSpecial Weather StatementPSRPinal42 min
Jul 15, 5:44 AM MSTAreal Flood AdvisoryPSRPinal3 hr
Jul 15, 2:36 PM MSTAreal Flood AdvisoryPSRMaricopa33 min
Jul 15, 2:46 PM MSTSpecial Weather StatementPSRMaricopa44 min
Jul 15, 2:48 PM MSTAreal Flood AdvisoryPSRMaricopa14 min
Jul 15, 3:02 PM MSTFlash Flood Warning Considerable damage threatPSRMaricopa4 hr
Jul 15, 3:09 PM MSTFlash Flood Warning Considerable damage threatPSRMaricopa4 hr
Jul 15, 3:31 PM MSTSpecial Weather StatementPSRMaricopa44 min
Jul 15, 3:41 PM MSTSpecial Weather StatementPSRGila49 min
Jul 15, 3:56 PM MSTSpecial Weather StatementPSR49 min
Jul 15, 4:04 PM MSTSpecial Weather StatementPSR41 min
Jul 15, 4:20 PM MSTSpecial Weather StatementPSRLa Paz40 min
Jul 15, 4:22 PM MSTAreal Flood AdvisoryPSRMaricopa3 hr
Jul 15, 4:28 PM MSTAreal Flood AdvisoryPSRMaricopa3 hr
Jul 15, 4:30 PM MSTSpecial Weather StatementPSRGila45 min
Jul 15, 4:41 PM MSTSevere Thunderstorm WarningPSRMaricopa49 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2021Every 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.