Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 4, NWS Phoenix, AZ

June 15, 2021Maricopa County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Jun 15, 2021, 8:39 PM MST for Maricopa County, Arizona. It was in force for 14 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: Jun 15, 2021, 8:39 PM MST (03:39 UTC)
Expired: Jun 15, 2021, 8:53 PM MST
In force: 14 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), 40 km from the middle of the area, began a volume at 03:41 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
Jun 15, 8:40 PM MST	TSTM WND GST 45	1 Ese North Scottsdale, AZ	*DELAYED REPORT*.

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

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 3.7 hours before the alert went out and 184 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 5149 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: 3 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

939 
WUUS55 KPSR 160339
SVRPSR
AZC013-160415-
/O.NEW.KPSR.SV.W.0004.210616T0339Z-210616T0415Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Phoenix AZ
839 PM MST Tue Jun 15 2021

The National Weather Service in Phoenix has issued a

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

* Until 915 PM MST.

* At 839 PM MST, a severe thunderstorm was located over Paradise
  Valley, moving southwest at 45 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Phoenix, Scottsdale, Paradise Valley, Piestewa Peak Park, Downtown
  Scottsdale, Scottsdale Airport and Camelback Mountain.

* This includes the following highways...
  AZ Route 51 between mile markers 3 and 13.
  AZ Route 101 between mile markers 38 and 47.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3364 11184 3349 11187 3349 11207 3364 11203
TIME...MOT...LOC 0339Z 051DEG 40KT 3355 11196 

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

Hirsch

1 follow-up statement

838 
WWUS55 KPSR 160353
SVSPSR

Severe Weather Statement
National Weather Service Phoenix AZ
853 PM MST Tue Jun 15 2021

AZC013-160403-
/O.CAN.KPSR.SV.W.0004.000000T0000Z-210616T0415Z/
Maricopa AZ-
853 PM MST Tue Jun 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR MARICOPA COUNTY IS
CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.

LAT...LON 3364 11184 3349 11187 3349 11207 3364 11203
TIME...MOT...LOC 0352Z 051DEG 40KT 3345 11211 

$$

Hirsch

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 15, 5:32 PM MST	Special Weather Statement	PSR	Gila	73 min
Jun 15, 6:29 PM MST	Special Weather Statement	PSR		76 min
Jun 15, 6:55 PM MST	Special Weather Statement	PSR	Pinal	65 min
Jun 15, 7:54 PM MST	Special Weather Statement	PSR		51 min
Jun 15, 8:24 PM MST	Special Weather Statement	PSR		51 min
Jun 15, 8:33 PM MST	Special Weather Statement	PSR		42 min
Jun 15, 8:58 PM MST	Special Weather Statement	PSR	Maricopa	47 min
Jun 15, 10:20 PM MST	Special Weather Statement	PSR	Maricopa	25 min
Jun 16, 12:45 AM MST	Dust Storm Advisory	PSR	Maricopa, Pinal	45 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.