Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 38, NWS Phoenix, AZ

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

NWS Phoenix, AZ issued this flash flood warning at Jul 14, 2021, 10:30 PM MST for La Paz County, Maricopa 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: Jul 14, 2021, 10:30 PM MST (05:30 UTC)
Expired: Jul 15, 2021, 2:00 AM MST
In force: 4 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 Yuma radar (KYUX), 169 km from the middle of the area, began a volume at 05:31 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 00:00Z, 5.5 hours before the alert went out and 140 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.

107 
WGUS55 KPSR 150530
FFWPSR
AZC012-013-150800-
/O.NEW.KPSR.FF.W.0038.210715T0530Z-210715T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
1030 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...
  East Central La Paz County in west central Arizona...

* Until 100 AM MST.

* At 1030 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. Additional rainfall amounts of 0.25 to 0.75 inches 
  are possible in the warned area. 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...
  Salome.

This includes the following highways...
	AZ Interstate 10 between mile markers 43 and 52.

This includes the following streams and drainages...
  Browns Canyon Wash, Tiger Wash, Alamo Wash and Centennial 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 3356 11334 3352 11362 3359 11381 3365 11381
      3383 11342 3383 11330 3364 11319 3356 11333

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

$$

SDB

2 follow-up statements

008 
WGUS75 KPSR 150631 RRA
FFSPSR

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

AZC012-013-150800-
/O.CON.KPSR.FF.W.0038.000000T0000Z-210715T0800Z/
/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 1 AM MST THURSDAY FOR 
MARICOPA AND EAST CENTRAL LA PAZ COUNTIES...

At 1131 PM MST, Doppler radar indicated thunderstorms producing 
heavy rain across the warned area. Between 1 and 2 inches of rain 
have fallen. Additional rainfall amounts of 0.25 to 0.75 inches are 
possible in the warned area. 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...
  Salome.

This includes the following highways...
	AZ Interstate 10 between mile markers 43 and 52.

This includes the following streams and drainages...
  Browns Canyon Wash, Tiger Wash, Alamo Wash and Centennial 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 3356 11334 3352 11362 3359 11381 3365 11381
      3383 11342 3383 11330 3364 11319 3356 11333

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

$$

AD

403 
WGUS55 KPSR 150718
FFWPSR
AZC012-013-150900-
/O.EXT.KPSR.FF.W.0038.000000T0000Z-210715T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
1218 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...
  East Central La Paz County in west central Arizona...

* Until 200 AM MST.

* At 1218 AM MST, Streams and washes continue to flow as runoff from 
  evening thunderstorms.

  HAZARD...Life threatening 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...
  Salome.

This includes the following highways...
	AZ Interstate 10 between mile markers 43 and 52.

This includes the following streams and drainages...
  Browns Canyon Wash, Tiger Wash, Alamo Wash and Centennial 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 3356 11334 3352 11362 3359 11381 3365 11381
      3383 11342 3383 11330 3364 11319 3356 11333

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

$$

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, 8:31 PM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz, Maricopa	5 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 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.