Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 128, NWS Phoenix, AZ

October 5, 2021La Paz County, Maricopa County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Oct 5, 2021, 7:38 PM MST for La Paz County, Maricopa County, Arizona. It was in force for 37 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: Oct 5, 2021, 7:38 PM MST (02:38 UTC)
Expired: Oct 5, 2021, 8:15 PM MST
In force: 37 min
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties La Paz County, AZ, Maricopa County, AZ

The radar

The Phoenix radar (KIWA), 166 km from the middle of the area, began a volume at 02:39 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 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

Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 2.6 hours before the alert went out and 233 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: 840 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 135 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

354 
WUUS55 KPSR 060238
SVRPSR
AZC012-013-060315-
/O.NEW.KPSR.SV.W.0128.211006T0238Z-211006T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Phoenix AZ
738 PM MST Tue Oct 5 2021

The National Weather Service in Phoenix has issued a

* Severe Thunderstorm Warning for...
  East central La Paz County in west central Arizona...
  Maricopa County in south central Arizona...

* Until 815 PM MST.

* At 737 PM MST, a severe thunderstorm was located 16 miles south of
  Salome, or 33 miles west of Tonopah, moving northeast 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.

* This severe thunderstorm will remain over mainly rural areas of
  east central La Paz and Maricopa Counties.

This includes the following highways...
AZ Interstate 10 between mile markers 56 and 74.
US Highway 60 between mile markers 67 and 74.

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 3344 11352 3355 11362 3395 11341 3367 11301
TIME...MOT...LOC 0237Z 225DEG 30KT 3356 11351 

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

$$

JS

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, 5:19 PM MST	Severe Thunderstorm Warning Considerable damage threat	PSR	Maricopa, Pinal	41 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, 7:50 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.