Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 131, NWS Phoenix, AZ

August 9, 2021Gila County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Aug 9, 2021, 10:40 PM MST for Gila 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, 10:40 PM MST (05:40 UTC)
Expired: Aug 10, 2021, 2:45 AM MST
In force: 4 hr
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Gila County, AZ

The radar

The Phoenix radar (KIWA), 66 km from the middle of the area, began a volume at 05:41 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, 5.7 hours before the alert went out and 72 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: 413 J/kg
Mixed-layer CIN: -229 J/kg
Mixed-layer LCL: 1911 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 88 m²/s²
0-3 km storm-relative helicity: 136 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

745 
WGUS55 KPSR 100540
FFWPSR
AZC007-100945-
/O.NEW.KPSR.FF.W.0131.210810T0540Z-210810T0945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
1040 PM MST Mon Aug 9 2021

The National Weather Service in Phoenix has issued a

* Flash Flood Warning for...
  The Bush burn scar in...
  Gila County in east central Arizona...

* Until 245 AM MST.

* At 1040 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain over the Bush Burn Scar. Between 1 and 1.5 inches of 
  rain have fallen. Additional rainfall amounts up to 0.5 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 in and around the Bush Burn
           Scar.

  SOURCE...Radar.

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

* Some locations that will experience flash flooding include...
  Punkin Center and Tonto Basin.

This includes the following highways...
	AZ Route 188 between mile markers 255 and 261.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3380 11139 3381 11139 3382 11138 3382 11137
      3383 11138 3384 11139 3385 11139 3386 11139
      3387 11130 3381 11127 3380 11126 3378 11125
      3379 11138 3380 11138

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

$$

INS

2 follow-up statements

872 
WGUS75 KPSR 100702
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
1202 AM MST Tue Aug 10 2021

AZC007-100945-
/O.CON.KPSR.FF.W.0131.000000T0000Z-210810T0945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gila AZ-
1202 AM MST Tue Aug 10 2021

...FLASH FLOOD WARNING FOR THE BUSH BURN SCAR REMAINS IN EFFECT 
UNTIL 245 AM MST EARLY THIS MORNING FOR GILA COUNTY...

At 1202 AM MST, Doppler radar indicated thunderstorms producing 
heavy rain over the Bush Burn Scar. Between 1 and 1.5 inches of rain 
have fallen. Additional rainfall amounts up to 0.5 inches are 
possible in the warned area. Flash flooding is ongoing.

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

SOURCE...Radar.

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

Some locations that will experience flash flooding include...
  Punkin Center and Tonto Basin.

This includes the following highways...
	AZ Route 188 between mile markers 255 and 261.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3380 11139 3381 11139 3382 11138 3382 11137
      3383 11138 3384 11139 3385 11139 3386 11139
      3387 11130 3381 11127 3380 11126 3378 11125
      3379 11138 3380 11138

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

$$

JS

859 
WGUS75 KPSR 100940
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
240 AM MST Tue Aug 10 2021

AZC007-100950-
/O.EXP.KPSR.FF.W.0131.000000T0000Z-210810T0945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gila AZ-
240 AM MST Tue Aug 10 2021

...FLASH FLOOD WARNING FOR THE BUSH BURN SCAR WILL EXPIRE AT 245 AM 
MST EARLY THIS MORNING FOR GILA COUNTY...

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

LAT...LON 3380 11139 3381 11139 3382 11138 3382 11137
      3383 11138 3384 11139 3385 11139 3386 11139
      3387 11130 3381 11127 3380 11126 3378 11125
      3379 11138 3380 11138

$$

JS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 5:24 PM MST	Areal Flood Advisory	PSR	La Paz	3 hr
Aug 9, 5:44 PM MST	Special Weather Statement	PSR	La Paz	46 min
Aug 9, 6:22 PM MST	Special Weather Statement	PSR		38 min
Aug 9, 10:11 PM MST	Special Weather Statement	PSR	Gila	34 min
Aug 9, 11:51 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	8 hr
Aug 10, 1:40 AM MST	Special Weather Statement	PSR	Maricopa	50 min
Aug 10, 1:54 AM MST	Special Weather Statement	PSR	Maricopa	51 min
Aug 10, 2:15 AM MST	Special Weather Statement	PSR	Maricopa	45 min
Aug 10, 2:23 AM MST	Areal Flood Advisory	PSR	Maricopa, Pinal	2 hr
Aug 10, 4:27 AM MST	Special Weather Statement	PSR	La Paz	48 min
Aug 10, 5:07 AM MST	Special Weather Statement	PSR	La Paz	53 min
Aug 10, 5:09 AM MST	Areal Flood Advisory	PSR	La Paz	2 hr
Aug 10, 5:52 AM MST	Areal Flood Advisory	PSR	Maricopa, Pinal	5 hr
Aug 10, 6:21 AM MST	Special Weather Statement	PSR	La Paz	39 min
Aug 10, 7:39 AM MST	Areal Flood Advisory	PSR	Maricopa, Pinal	3 hr
Aug 10, 8:00 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	3 hr
Aug 10, 8:06 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	4 hr
Aug 10, 8:30 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa, Pinal	7 hr
Aug 10, 9:54 AM MST	Areal Flood Advisory	PSR	La Paz	3 hr
Aug 10, 3:05 PM MST	Areal Flood Warning	PSR	Maricopa, Pinal	7 hr
Aug 10, 4:43 PM MST	Special Weather Statement	PSR		62 min
Aug 10, 4:44 PM MST	Special Weather Statement	PSR		61 min
Aug 10, 4:56 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.