Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 37, NWS Phoenix, AZ

July 14, 2021La Paz County, Maricopa County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Jul 14, 2021, 8:31 PM MST for La Paz County, Maricopa County, Arizona. It was in force for 5 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: Jul 14, 2021, 8:31 PM MST (03:31 UTC)
Expired: Jul 15, 2021, 2:00 AM MST
In force: 5 hr
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

Counties La Paz County, AZ, Maricopa County, AZ

The radar

The Phoenix radar (KIWA), 196 km from the middle of the area, began a volume at 03:34 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, 3.5 hours before the alert went out and 164 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: 417 J/kg
Mixed-layer CIN: -114 J/kg
Mixed-layer LCL: 2204 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 64 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

625 
WGUS55 KPSR 150331
FFWPSR
AZC012-013-150730-
/O.NEW.KPSR.FF.W.0037.210715T0331Z-210715T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
831 PM MST Wed Jul 14 2021

The National Weather Service in Phoenix has issued a

* Flash Flood Warning for...
  Maricopa County in south central Arizona...
  Northeastern La Paz County in west central Arizona...

* Until 1230 AM MST.

* At 831 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 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...
  Wenden, Salome, Harcuvar, Gladden, Vicksburg and Vicksburg 
  Junction.

This includes the following highways...
	AZ Route 72 between mile markers 42 and 49.
	US Highway 60 between mile markers 44 and 53.

This includes the following streams and drainages...
  Browns Canyon Wash, Santa Maria River, Date Creek, Calcite Wash, 
  Bullard Wash, Cunningham Wash, Bouse Wash, Bill Williams River, 
  Centennial Wash, Mississippi Wash and Salome Wash.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3383 11342 3366 11376 3369 11380 3375 11382
      3387 11382 3411 11377 3417 11378 3420 11383
      3422 11383 3424 11373 3421 11370 3421 11366
      3423 11360 3431 11353 3429 11337 3432 11333
      3400 11333 3400 11320 3390 11323 3384 11328

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

$$

JS

3 follow-up statements

435 
WGUS75 KPSR 150631
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
1131 PM MST Wed Jul 14 2021

AZC012-013-150730-
/O.CON.KPSR.FF.W.0037.000000T0000Z-210715T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
La Paz AZ-Maricopa AZ-
1131 PM MST Wed Jul 14 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1230 AM MST THURSDAY 
FOR MARICOPA AND NORTHEASTERN LA PAZ COUNTIES...

At 1131 PM MST, Doppler radar and automated stream flow gauges 
indicated thunderstorms produced heavy rain across the warned area. 
Washes are flowing and flash flooding is ongoing or expected.

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

SOURCE...Radar and stream flow gauges.

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

Some locations that will experience flash flooding include...
  Wenden, Salome, Harcuvar, Gladden, Vicksburg and Vicksburg 
  Junction.

This includes the following highways...
	AZ Route 72 between mile markers 42 and 49.
	US Highway 60 between mile markers 44 and 53.

This includes the following streams and drainages...
Stream data indicates water levels have risen just above two feet in 
the Centennial Wash at Wenden.

Other streams and drainages include...
Browns Canyon Wash, Santa Maria River, Date Creek, Calcite Wash, 
Bullard Wash, Cunningham Wash, Bouse Wash, Bill Williams River, 
Mississippi Wash and Salome Wash.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3383 11342 3366 11376 3369 11380 3375 11382
      3387 11382 3411 11377 3417 11378 3420 11383
      3422 11383 3424 11373 3421 11370 3421 11366
      3423 11360 3431 11353 3429 11337 3432 11333
      3400 11333 3400 11320 3390 11323 3384 11328

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

$$

AD

122 
WGUS55 KPSR 150716
FFWPSR
AZC012-013-150900-
/O.EXT.KPSR.FF.W.0037.000000T0000Z-210715T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
1216 AM MST Thu Jul 15 2021

The National Weather Service in Phoenix has extended the

* Flash Flood Warning for...
  Maricopa County in south central Arizona...
  Northeastern La Paz County in west central Arizona...

* Until 200 AM MST.

* At 1216 AM MST, Stream gauges report runoff from evening 
  thunderstorms continues. Between 1 and 2 inches of rain had 
  fallen. Washes and streams are flowing.

  HAZARD...Potentially Life threatening flash flooding.
           Thunderstorms produced flash flooding.

  SOURCE...Gauges reported.

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

* Some locations that will experience flash flooding include...
  Wenden, Salome, Harcuvar, Gladden, Vicksburg and Vicksburg 
  Junction.

This includes the following highways...
	AZ Route 72 between mile markers 42 and 49.
	US Highway 60 between mile markers 44 and 53.

This includes the following streams and drainages...
Water levels continue to increase in Centennial Wash through Wenden.

Other streams that may see increasing flow include: Browns Canyon 
Wash, Santa Maria River, Date Creek, Calcite Wash, Bullard Wash, 
Cunningham Wash, Bouse Wash, Bill Williams River, Mississippi Wash 
and Salome Wash.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3383 11342 3366 11376 3369 11380 3375 11382
      3387 11382 3411 11377 3417 11378 3420 11383
      3422 11383 3424 11373 3421 11370 3421 11366
      3423 11360 3431 11353 3429 11337 3432 11333
      3400 11333 3400 11320 3390 11323 3384 11328

FLASH FLOOD...GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

AD

737 
WGUS75 KPSR 150900
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
200 AM MST Thu Jul 15 2021

AZC012-013-150910-
/O.EXP.KPSR.FF.W.0037.000000T0000Z-210715T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
La Paz AZ-Maricopa AZ-
200 AM MST Thu Jul 15 2021

...FLASH FLOOD WARNING HAS EXPIRED FOR MARICOPA AND NORTHEASTERN LA 
PAZ COUNTIES...

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 3383 11342 3366 11376 3369 11380 3375 11382
      3387 11382 3411 11377 3417 11378 3420 11383
      3422 11383 3424 11373 3421 11370 3421 11366
      3423 11360 3431 11353 3429 11337 3432 11333
      3400 11333 3400 11320 3390 11323 3384 11328

$$

AD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 14, 5:17 PM MST	Special Weather Statement	PSR		43 min
Jul 14, 5:35 PM MST	Special Weather Statement	PSR	La Paz	40 min
Jul 14, 6:02 PM MST	Special Weather Statement	PSR		43 min
Jul 14, 6:06 PM MST	Special Weather Statement	PSR	La Paz	39 min
Jul 14, 6:16 PM MST	Special Weather Statement	PSR		44 min
Jul 14, 6:23 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	4 hr
Jul 14, 6:35 PM MST	Areal Flood Advisory	PSR	La Paz	115 min
Jul 14, 6:38 PM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Jul 14, 6:48 PM MST	Special Weather Statement	PSR		42 min
Jul 14, 7:03 PM MST	Special Weather Statement	PSR	Maricopa	42 min
Jul 14, 7:32 PM MST	Special Weather Statement	PSR		28 min
Jul 14, 7:51 PM MST	Special Weather Statement	PSR		39 min
Jul 14, 8:04 PM MST	Areal Flood Advisory	PSR	La Paz, Maricopa	3 hr
Jul 14, 8:10 PM MST	Areal Flood Advisory	PSR	Maricopa, Yuma	3 hr
Jul 14, 9:21 PM MST	Special Weather Statement	PSR		39 min
Jul 14, 9:35 PM MST	Special Weather Statement	PSR	La Paz	40 min
Jul 14, 9:52 PM MST	Areal Flood Advisory	PSR	La Paz, Maricopa	38 min
Jul 14, 10:30 PM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz, Maricopa	4 hr
Jul 15, 5:14 AM MST	Special Weather Statement	PSR	Pinal	46 min
Jul 15, 5:18 AM MST	Special Weather Statement	PSR	Pinal	42 min
Jul 15, 5:44 AM MST	Areal Flood Advisory	PSR	Pinal	3 hr
Jul 15, 2:36 PM MST	Areal Flood Advisory	PSR	Maricopa	33 min
Jul 15, 2:46 PM MST	Special Weather Statement	PSR	Maricopa	44 min
Jul 15, 2:48 PM MST	Areal Flood Advisory	PSR	Maricopa	14 min
Jul 15, 3:02 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	4 hr
Jul 15, 3:09 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	4 hr
Jul 15, 3:31 PM MST	Special Weather Statement	PSR	Maricopa	44 min
Jul 15, 3:41 PM MST	Special Weather Statement	PSR	Gila	49 min
Jul 15, 3:56 PM MST	Special Weather Statement	PSR		49 min
Jul 15, 4:04 PM MST	Special Weather Statement	PSR		41 min
Jul 15, 4:20 PM MST	Special Weather Statement	PSR	La Paz	40 min
Jul 15, 4:22 PM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Jul 15, 4:26 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	49 min
Jul 15, 4:28 PM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Jul 15, 4:30 PM MST	Special Weather Statement	PSR	Gila	45 min
Jul 15, 4:41 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	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.