Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 48, NWS Phoenix, AZ

August 10, 2021La Paz County, Yuma County, Arizona; Imperial County, Riverside County, California

NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 10, 2021, 8:18 PM MST for La Paz County, Yuma County, Arizona; Imperial County, Riverside County, California. It was in force for 57 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: Aug 10, 2021, 8:18 PM MST (03:18 UTC)
Expired: Aug 10, 2021, 9:15 PM MST
In force: 57 min
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties La Paz County, AZ, Yuma County, AZ, Imperial County, CA, Riverside County, CA

The radar

The Yuma radar (KYUX), 119 km from the middle of the area, began a volume at 03:19 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 00:00Z, 3.3 hours before the alert went out and 213 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: 934 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 1571 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -19 m²/s²
0-3 km storm-relative helicity: 0 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

279 
WUUS55 KPSR 110318
SVRPSR
AZC012-027-CAC025-065-110415-
/O.NEW.KPSR.SV.W.0048.210811T0318Z-210811T0415Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Phoenix AZ
818 PM MST Tue Aug 10 2021

The National Weather Service in Phoenix has issued a

* Severe Thunderstorm Warning for...
  Southern La Paz County in west central Arizona...
  Northwestern Yuma County in southwestern Arizona...
  Northeastern Imperial County in southeastern California...
  Riverside County in southern California...

* Until 915 PM MST/915 PM PDT/.

* At 816 PM MST/PDT, severe thunderstorms were located over central 
  and southwest La Paz County moving southwest at 20 mph.

  HAZARD...60 mph wind gusts. Small hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Martinez Lake, Blythe, Ripley, Quartzsite, Cibola, Palo Verde, 
  Salome, and Brenda.

This includes the following highways...
AZ Interstate 10 between mile markers 1 and 52.
CA Interstate 10 between mile markers 151 and 156.
US Highway 60 between mile markers 31 and 59.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and is likely 
causing localized flash flooding of normally dry washes and low 
lying areas. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3385 11418 3381 11356 3342 11372 3290 11444
      3327 11503 3353 11477
TIME...MOT...LOC 0316Z 033DEG 15KT 3318 11451 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

AJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 5:23 PM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Aug 10, 5:35 PM MST	Special Weather Statement	PSR		40 min
Aug 10, 5:51 PM MST	Areal Flood Advisory	PSR	La Paz	3 hr
Aug 10, 5:55 PM MST	Special Weather Statement	PSR	La Paz	50 min
Aug 10, 6:30 PM MST	Severe Thunderstorm Warning	PSR	La Paz, Yuma	45 min
Aug 10, 6:36 PM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz, Maricopa	4 hr
Aug 10, 7:15 PM MST	Dust Storm Warning	PSR	La Paz, Yuma	60 min
Aug 10, 7:26 PM MST	Severe Thunderstorm Warning	PSR	La Paz, Maricopa, Yuma	49 min
Aug 10, 7:33 PM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz, Yuma	4 hr
Aug 10, 7:43 PM MST	Dust Storm Advisory	PSR	Maricopa, Pinal, Yuma	62 min
Aug 10, 8:38 PM MST	Dust Storm Warning	PSR	La Paz, Yuma	52 min
Aug 10, 9:08 PM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz, Yuma	6 hr
Aug 10, 9:12 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa, Yuma	6 hr
Aug 10, 9:23 PM MST	Special Weather Statement	PSR	Yuma	97 min
Aug 10, 9:42 PM MST	Dust Storm Warning	PSR	Yuma	93 min
Aug 10, 10:35 PM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz, Maricopa, Yuma	6 hr
Aug 11, 12:01 AM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz, Yuma	5 hr
Aug 11, 2:00 AM MST	Areal Flood Advisory	PSR	Gila	3 hr
Aug 11, 3:29 AM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Aug 11, 4:33 AM MST	Areal Flood Advisory	PSR	Maricopa, Pinal	3 hr
Aug 11, 6:06 AM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Aug 11, 6:11 AM MST	Areal Flood Advisory	PSR	Maricopa, Pinal	3 hr
Aug 11, 6:15 AM MST	Areal Flood Advisory	PSR	Gila, Maricopa	3 hr
Aug 11, 7:30 AM MST	Flash Flood Warning Considerable damage threat	PSR	Gila, Maricopa	6 hr
Aug 11, 7:46 AM MST	Areal Flood Advisory	PSR	Maricopa, Pinal	3 hr
Aug 11, 8:12 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa, Pinal	6 hr
Aug 11, 9:13 AM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Aug 11, 1:01 PM MST	Special Weather Statement	PSR	Yuma	59 min
Aug 11, 1:29 PM MST	Areal Flood Warning	PSR	Maricopa	6 hr
Aug 11, 1:43 PM MST	Areal Flood Warning	PSR	Gila	4 hr
Aug 11, 1:49 PM MST	Areal Flood Advisory	PSR	Yuma	3 hr
Aug 11, 2:01 PM MST	Dust Storm Advisory	PSR	Yuma	59 min
Aug 11, 2:17 PM MST	Severe Thunderstorm Warning	PSR	Yuma	43 min
Aug 11, 3:02 PM MST	Flash Flood Warning Considerable damage threat	PSR	Yuma	4 hr
Aug 11, 3:11 PM MST	Special Weather Statement	PSR		64 min
Aug 11, 3:29 PM MST	Special Weather Statement	PSR	Maricopa	46 min
Aug 11, 3:34 PM MST	Special Weather Statement	PSR		56 min
Aug 11, 3:44 PM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Aug 11, 3:47 PM MST	Areal Flood Advisory	PSR	Maricopa	14 min
Aug 11, 3:50 PM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Aug 11, 4:01 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	3 hr
Aug 11, 4:33 PM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Aug 11, 4:44 PM MST	Dust Storm Advisory	PSR	Maricopa, Pinal	61 min
Aug 11, 4:56 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	3 hr
Aug 10, 9:54 PM MST	Flash Flood Warning Considerable damage threat	PSR	Riverside	86 min
Aug 10, 11:16 PM MST	Special Weather Statement	PSR	Imperial	74 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2021 Severe Thunderstorm Warnings in California, 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.