Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 16, NWS Phoenix, AZ

July 3, 2021Gila County, Maricopa County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Jul 3, 2021, 6:23 PM MST for Gila County, Maricopa County, Arizona. It was in force for 4 hr. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 3, 2021, 6:23 PM MST (01:23 UTC)
Expired: Jul 3, 2021, 10:30 PM MST
In force: 4 hr
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

Counties Gila County, AZ, Maricopa County, AZ

The radar

The Phoenix radar (KIWA), 61 km from the middle of the area, began a volume at 01:26 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.

What was reported inside it

Time	Report	Where	Remark
Jul 3, 7:00 PM MST	FLASH FLOOD	10 Sse Roosevelt, AZ	DELAYED REPORT UPPER CAMPAIGN CREEK ROSE 1 TO 2 FOOT. LOW WATER CROSSING ALONG PORTIONS OF J BAR ROAD CLOSED DUE TO FLOWING WATER AND DEBRIS. TIME ESTIMATED BASED ON RADAR AND NEARBY NWS RAIN GAGE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Phoenix, AZ (KPSR), launched 00:00Z, 1.4 hours before the alert went out and 81 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: 281 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 3054 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -30 m²/s²
0-3 km storm-relative helicity: 3 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

740 
WGUS55 KPSR 040123
FFWPSR
AZC007-013-040530-
/O.NEW.KPSR.FF.W.0016.210704T0123Z-210704T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
623 PM MST Sat Jul 3 2021

The National Weather Service in Phoenix has issued a

* Flash Flood Warning for...
  The Woodbury burn scar in...
  Gila County in east central Arizona...
  Maricopa County in south central Arizona...

* Until 1030 PM MST.

* At 623 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain over the Woodbury Burn Scar. Between 1 and 2 inches of 
  rain have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

Excessive rainfall over the burn scar will result in rapid rise in 
Campaign Creek.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding in and around the Woodbury
           Burn Scar.

  SOURCE...Radar.

  IMPACT...Life threatening flash flooding of areas in and around
           the Woodbury Burn Scar.

* Some locations that will experience flash flooding include...
  Roosevelt, Tonto National Monument, Roosevelt Dam and Roosevelt 
  Estates.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3364 11120 3369 11117 3364 11097 3356 11098
      3348 11102 3347 11109 3348 11118 3358 11123

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

$$

MS

2 follow-up statements

068 
WGUS75 KPSR 040251
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
751 PM MST Sat Jul 3 2021

AZC007-013-040530-
/O.CON.KPSR.FF.W.0016.000000T0000Z-210704T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gila AZ-Maricopa AZ-
751 PM MST Sat Jul 3 2021

...FLASH FLOOD WARNING FOR THE WOODBURY BURN SCAR REMAINS IN EFFECT 
UNTIL 1030 PM MST THIS EVENING FOR GILA AND MARICOPA COUNTIES...

At 751 PM MST, Doppler radar indicated upward to 2 inches of rain 
had fallen over portions of the burn scar. Upper Campaign Creek 
received over an inch of rainfall. Rapid rises in creeks and impacts 
to low water crossings along J Bar Road can be expected.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding in and around the Woodbury Burn Scar.

SOURCE...Radar.

IMPACT...Life threatening flash flooding of areas in and around
         the Woodbury Burn Scar.

Some locations that will experience flash flooding include...
  Roosevelt, Tonto National Monument, Roosevelt Dam and Roosevelt 
  Estates.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3364 11120 3369 11117 3364 11097 3356 11098
      3348 11102 3347 11109 3348 11118 3358 11123

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

$$

MS

150 
WGUS75 KPSR 040531 RRA
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
1031 PM MST Sat Jul 3 2021

AZC007-013-040541-
/O.EXP.KPSR.FF.W.0016.000000T0000Z-210704T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gila AZ-Maricopa AZ-
1031 PM MST Sat Jul 3 2021

...FLASH FLOOD WARNING FOR THE WOODBURY BURN SCAR HAS EXPIRED FOR 
GILA AND MARICOPA COUNTIES...

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

LAT...LON 3364 11120 3369 11117 3364 11097 3356 11098
      3348 11102 3347 11109 3348 11118 3358 11123

$$

SDB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 3, 5:11 PM MST	Special Weather Statement	PSR		49 min
Jul 3, 5:20 PM MST	Special Weather Statement	PSR		25 min
Jul 3, 5:29 PM MST	Areal Flood Advisory	PSR	Pinal	3 hr
Jul 3, 5:32 PM MST	Special Weather Statement	PSR	Maricopa	43 min
Jul 3, 5:38 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	4 hr
Jul 3, 5:41 PM MST	Dust Storm Warning	PSR	Maricopa, Pinal	44 min
Jul 3, 5:43 PM MST	Dust Storm Warning	PSR	Maricopa	62 min
Jul 3, 5:56 PM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Jul 3, 6:05 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	4 hr
Jul 3, 6:10 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	4 hr
Jul 3, 6:20 PM MST	Special Weather Statement	PSR	Maricopa	40 min
Jul 3, 6:31 PM MST	Special Weather Statement	PSR	Gila	44 min
Jul 3, 6:43 PM MST	Dust Storm Warning	PSR	La Paz, Maricopa, Pinal, Yuma	62 min
Jul 3, 6:46 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila, Maricopa	4 hr
Jul 3, 7:13 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	4 hr
Jul 4, 3:09 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	4 hr
Jul 4, 3:43 PM MST	Special Weather Statement	PSR	Gila	32 min
Jul 4, 4:10 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	4 hr
Jul 4, 4:36 PM MST	Special Weather Statement	PSR	Gila	24 min
Jul 4, 4:51 PM MST	Special Weather Statement	PSR	Gila	39 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.