Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 201, NWS Phoenix, AZ

August 17, 2021Gila County, Pinal County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Aug 17, 2021, 6:26 AM MST for Gila County, Pinal 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: Aug 17, 2021, 6:26 AM MST (13:26 UTC)
Expired: Aug 17, 2021, 11:10 AM MST
In force: 5 hr
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

Counties Gila County, AZ, Pinal County, AZ

The radar

The Phoenix radar (KIWA), 65 km from the middle of the area, began a volume at 13:25 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, 1.4 hours before the alert went out and 89 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: 14 J/kg
Mixed-layer CIN: -428 J/kg
Mixed-layer LCL: 1452 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 154 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

As transmitted.

827 
WGUS55 KPSR 171326
FFWPSR
AZC007-021-171930-
/O.NEW.KPSR.FF.W.0201.210817T1326Z-210817T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
626 AM MST Tue Aug 17 2021

The National Weather Service in Phoenix has issued a

* Flash Flood Warning for...
  Gila County in east central Arizona...
  Pinal County in southeastern Arizona...

* Until 1230 PM MST Tuesday.

* At 626 AM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 inches of rain 
  have fallen. Additional rainfall amounts of 0.5 to 1 inch are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly within Pinto Creek and nearby areas.

  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...
  Top-Of-The-World and Roosevelt Estates.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3346 11101 3351 11100 3354 11100 3356 11101
      3365 11101 3365 11099 3358 11099 3354 11098
      3346 11099 3344 11097 3340 11096 3336 11098
      3336 11104 3339 11106 3342 11106 3345 11105
      3346 11104

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

$$

Hirsch

1 follow-up statement

617 
WGUS75 KPSR 171810
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
1110 AM MST Tue Aug 17 2021

AZC007-021-171820-
/O.CAN.KPSR.FF.W.0201.000000T0000Z-210817T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gila AZ-Pinal AZ-
1110 AM MST Tue Aug 17 2021

...FLASH FLOOD WARNING IS CANCELLED FOR GILA AND PINAL COUNTIES...

Flood waters have receded along Pinto Creek. Flooding is no longer 
expected to pose a threat. Please continue to heed remaining road 
closures.

LAT...LON 3346 11101 3351 11100 3354 11100 3356 11101
      3365 11101 3365 11099 3358 11099 3354 11098
      3346 11099 3344 11097 3340 11096 3336 11098
      3336 11104 3339 11106 3342 11106 3345 11105
      3346 11104

$$

MS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 16, 5:15 PM MST	Special Weather Statement	PSR	Gila	45 min
Aug 16, 5:46 PM MST	Special Weather Statement	PSR		44 min
Aug 16, 6:07 PM MST	Special Weather Statement	PSR	Gila	38 min
Aug 16, 6:14 PM MST	Severe Thunderstorm Warning	PSR	Gila	46 min
Aug 16, 6:37 PM MST	Special Weather Statement	PSR	Pinal	53 min
Aug 16, 6:55 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	6 hr
Aug 16, 8:24 PM MST	Special Weather Statement	PSR		51 min
Aug 16, 8:41 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	5 hr
Aug 16, 8:53 PM MST	Special Weather Statement	PSR	Gila	52 min
Aug 16, 9:08 PM MST	Special Weather Statement	PSR	Gila	52 min
Aug 16, 9:22 PM MST	Severe Thunderstorm Warning	PSR	Gila, Maricopa, Pinal	38 min
Aug 16, 9:41 PM MST	Severe Thunderstorm Warning	PSR	Gila, Maricopa, Pinal	49 min
Aug 16, 9:49 PM MST	Severe Thunderstorm Warning Considerable damage threat	PSR	Gila, Maricopa	41 min
Aug 16, 10:01 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	4 hr
Aug 16, 10:01 PM MST	Special Weather Statement	PSR		44 min
Aug 16, 10:05 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	4 hr
Aug 16, 10:14 PM MST	Severe Thunderstorm Warning Considerable damage threat	PSR	Gila, Maricopa, Pinal	46 min
Aug 16, 10:22 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	10 hr
Aug 16, 10:28 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila, Maricopa, Pinal	10 hr
Aug 16, 10:36 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila, Maricopa	10 hr
Aug 16, 10:38 PM MST	Dust Storm Advisory	PSR	Maricopa, Pinal	67 min
Aug 16, 10:48 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa, Pinal	9 hr
Aug 16, 10:54 PM MST	Severe Thunderstorm Warning Destructive damage threat	PSR	Maricopa, Pinal	51 min
Aug 16, 10:58 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	7 hr
Aug 16, 11:04 PM MST	Dust Storm Warning	PSR	Maricopa, Pinal	56 min
Aug 16, 11:07 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa, Pinal	7 hr
Aug 16, 11:16 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	7 hr
Aug 16, 11:26 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa, Pinal	8 hr
Aug 16, 11:31 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	44 min
Aug 16, 11:41 PM MST	Severe Thunderstorm Warning Considerable damage threat	PSR	Maricopa, Pinal	49 min
Aug 16, 11:47 PM MST	Dust Storm Warning	PSR	Maricopa	58 min
Aug 16, 11:50 PM MST	Special Weather Statement	PSR		40 min
Aug 16, 11:52 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	38 min
Aug 16, 11:56 PM MST	Flash Flood Warning Considerable damage threat	PSR	Pinal	7 hr
Aug 16, 11:59 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	6 hr
Aug 17, 12:01 AM MST	Dust Storm Warning	PSR	Maricopa, Pinal	59 min
Aug 17, 12:09 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa, Pinal	8 hr
Aug 17, 12:32 AM MST	Special Weather Statement	PSR		43 min
Aug 17, 12:36 AM MST	Special Weather Statement	PSR	Maricopa	24 min
Aug 17, 4:05 AM MST	Areal Flood Advisory	PSR	Maricopa	4 hr
Aug 17, 4:26 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	6 hr
Aug 17, 5:29 AM MST	Special Weather Statement	PSR	Maricopa	76 min
Aug 17, 5:35 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	6 hr
Aug 17, 8:42 AM MST	Areal Flood Warning	PSR	Gila	5 days
Aug 17, 4:46 PM MST	Special Weather Statement	PSR		44 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.