Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 130, NWS Phoenix, AZ

August 9, 2021La Paz County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Aug 9, 2021, 4:30 PM MST for La Paz County, Arizona. It was in force for 4 hr. 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 9, 2021, 4:30 PM MST (23:30 UTC)
Expired: Aug 9, 2021, 8:00 PM MST
In force: 4 hr
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County La Paz County, AZ

The radar

The Las Vegas radar (KESX), 186 km from the middle of the area, began a volume at 23:31 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, 11.5 hours before the alert went out and 211 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: 249 J/kg
Mixed-layer CIN: -248 J/kg
Mixed-layer LCL: 1848 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: -23 m²/s²
0-3 km storm-relative helicity: 30 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

304 
WGUS55 KPSR 092330
FFWPSR
AZC012-100330-
/O.NEW.KPSR.FF.W.0130.210809T2330Z-210810T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
430 PM MST Mon Aug 9 2021

The National Weather Service in Phoenix has issued a

* Flash Flood Warning for...
  North Central La Paz County in west central Arizona...

* Until 830 PM MST.

* At 430 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 0.5 and 1.5 inches of 
  rain have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Radar.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  Quartzsite, Bouse, and Buckskin Mountain Park.

This includes the following highways...
	AZ Interstate 10 between mile markers 22 and 31.
	AZ Route 72 between mile markers 16 and 25.
	AZ Route 95 between mile markers 156 and 158...and
	between mile markers 160 and 161.
	US Highway 60 between mile markers 31 and 33.

This includes the following streams and drainages...
  Tyson Wash, and Bouse Wash.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3425 11400 3414 11394 3357 11399 3358 11417
      3419 11417 3426 11414 3426 11413 3427 11413
      3430 11412 3430 11411 3430 11409 3429 11407
      3426 11404 3427 11402 3426 11401

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

AJ

3 follow-up statements

443 
WGUS75 KPSR 100015
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
515 PM MST Mon Aug 9 2021

AZC012-100330-
/O.CON.KPSR.FF.W.0130.000000T0000Z-210810T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
La Paz AZ-
515 PM MST Mon Aug 9 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 PM MST THIS 
EVENING FOR NORTH CENTRAL LA PAZ COUNTY...

At 515 PM MST, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 0.5 and 1.5 inches of rain have 
fallen. Flash flooding is ongoing or expected to begin shortly.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Radar.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
  Quartzsite, Bouse and Buckskin Mountain Park.

This includes the following highways...
	AZ Interstate 10 between mile markers 22 and 31.
	AZ Route 72 between mile markers 16 and 25.
	AZ Route 95 between mile markers 156 and 157...and
	between mile markers 160 and 161.
	US Highway 60 between mile markers 31 and 33.

This includes the following streams and drainages...
  Tyson Wash, Bouse Wash, and Osborne Wash.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3425 11400 3414 11394 3357 11399 3358 11417
      3419 11417 3426 11414 3426 11413 3427 11413
      3430 11412 3430 11411 3430 11409 3429 11407
      3426 11404 3427 11402 3426 11401

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

AJ

034 
WGUS75 KPSR 100213
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
713 PM MST Mon Aug 9 2021

AZC012-100330-
/O.CON.KPSR.FF.W.0130.000000T0000Z-210810T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
La Paz AZ-
713 PM MST Mon Aug 9 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 PM MST THIS 
EVENING FOR NORTH CENTRAL LA PAZ COUNTY...

At 713 PM MST, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 1 and 1.5 inches of rain have 
fallen. Flash flooding is ongoing or expected to begin shortly.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Radar.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
  Quartzsite, Bouse, and Buckskin Mountain Park.

This includes the following highways...
	AZ Interstate 10 between mile markers 22 and 31.
	AZ Route 72 between mile markers 16 and 25.
	AZ Route 95 between mile markers 156 and 157...and
	between mile markers 160 and 161.
	US Highway 60 between mile markers 31 and 33.

This includes the following streams and drainages...
  Tyson Wash, Bouse Wash, and Osborne Wash.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3425 11400 3414 11394 3357 11399 3358 11417
      3419 11417 3426 11414 3426 11413 3427 11413
      3430 11412 3430 11411 3430 11409 3429 11407
      3426 11404 3427 11402 3426 11401

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

AJ

392 
WGUS75 KPSR 100300
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
800 PM MST Mon Aug 9 2021

AZC012-100310-
/O.CAN.KPSR.FF.W.0130.000000T0000Z-210810T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
La Paz AZ-
800 PM MST Mon Aug 9 2021

...FLASH FLOOD WARNING IS CANCELLED FOR NORTH CENTRAL LA PAZ 
COUNTY...

Flood waters have receded. The heavy rain has ended. Flooding is no 
longer expected to pose a threat. Please continue to heed remaining 
road closures.

LAT...LON 3425 11400 3414 11394 3357 11399 3358 11417
      3419 11417 3426 11414 3426 11413 3427 11413
      3430 11412 3430 11411 3430 11409 3429 11407
      3426 11404 3427 11402 3426 11401

$$

AJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 8, 5:37 PM MST	Special Weather Statement	PSR	La Paz	38 min
Aug 8, 6:06 PM MST	Areal Flood Advisory	PSR	La Paz	3 hr
Aug 8, 6:21 PM MST	Dust Storm Advisory	PSR	La Paz, Maricopa	54 min
Aug 8, 6:28 PM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz	4 hr
Aug 8, 6:46 PM MST	Special Weather Statement	PSR	La Paz	44 min
Aug 8, 7:51 PM MST	Areal Flood Advisory	PSR	La Paz	114 min
Aug 9, 6:20 AM MST	Special Weather Statement	PSR	Pinal	55 min
Aug 9, 7:56 AM MST	Areal Flood Advisory	PSR	Pinal	3 hr
Aug 9, 2:57 PM MST	Areal Flood Advisory	PSR	La Paz	3 hr
Aug 9, 3:32 PM MST	Special Weather Statement	PSR	La Paz	43 min
Aug 9, 4:11 PM MST	Special Weather Statement	PSR		49 min

Nearby

Flash Flood Warnings in Arizona, 2021 Every flash flood 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.