Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 27, NWS Phoenix, AZ

July 9, 2021Pinal County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Jul 9, 2021, 10:32 PM MST for Pinal 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 9, 2021, 10:32 PM MST (05:32 UTC)
Expired: Jul 10, 2021, 2:30 AM MST
In force: 4 hr
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Pinal County, AZ

The radar

The Phoenix radar (KIWA), 53 km from the middle of the area, began a volume at 05:32 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 83 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: 1011 J/kg
Mixed-layer CIN: -182 J/kg
Mixed-layer LCL: 3280 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: -35 m²/s²
0-3 km storm-relative helicity: 54 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

231 
WGUS55 KPSR 100532
FFWPSR
AZC021-100930-
/O.NEW.KPSR.FF.W.0027.210710T0532Z-210710T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
1032 PM MST Fri Jul 9 2021

The National Weather Service in Phoenix has issued a

* Flash Flood Warning for...
  The Telegraph burn scar in...
  Pinal County in southeastern Arizona...

* Until 230 AM MST.

* At 1032 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain over western parts of the Telegraph Burn Scar. Up to 
  1.5 inches of rain have fallen. Flash flooding is ongoing or 
  expected to begin shortly.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding in and around western
           portions of the Telegraph Burn Scar.

  SOURCE...Radar.

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

* Some locations that will experience flash flooding include...
  Superior, Boyce Thompson Arboretum and Top-Of-The-World.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a life threatening situation. Heavy rainfall will cause 
extensive and severe flash flooding of creeks...streams...and 
ditches in the Telegraph Burn Scar. Severe debris flows can also be 
anticipated across roads. Roads and driveways may be washed away in 
places. If you encounter flood waters...climb to safety.

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

&&

LAT...LON 3333 11103 3324 11099 3317 11109 3317 11116
      3322 11120 3326 11119 3331 11116 3334 11109

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

$$

Rogers

2 follow-up statements

665 
WGUS75 KPSR 100659
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
1159 PM MST Fri Jul 9 2021

AZC021-100930-
/O.CON.KPSR.FF.W.0027.000000T0000Z-210710T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pinal AZ-
1159 PM MST Fri Jul 9 2021

...FLASH FLOOD WARNING FOR THE TELEGRAPH BURN SCAR REMAINS IN EFFECT 
UNTIL 230 AM MST SATURDAY FOR PINAL COUNTY...

At 1159 PM MST, Doppler radar indicated thunderstorms produced heavy 
rain of up to 1.5 inches over the Telegraph Burn Scar. Flash 
flooding is ongoing or expected to begin shortly.

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

SOURCE...Radar.

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

Some locations that will experience flash flooding include...
  Superior, Boyce Thompson Arboretum and Top-Of-The-World.
  Mineral Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a life threatening situation. Heavy rainfall will cause 
extensive and severe flash flooding of creeks...streams...and 
ditches in the Telegraph Burn Scar. Severe debris flows can also be 
anticipated across roads. Roads and driveways may be washed away in 
places. If you encounter flood waters...climb to safety.

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

&&

LAT...LON 3333 11103 3324 11099 3317 11109 3317 11116
      3322 11120 3326 11119 3331 11116 3334 11109

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

$$

Iniguez

799 
WGUS75 KPSR 100927
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
227 AM MST Sat Jul 10 2021

AZC021-100937-
/O.EXP.KPSR.FF.W.0027.000000T0000Z-210710T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pinal AZ-
227 AM MST Sat Jul 10 2021

...FLASH FLOOD WARNING FOR THE TELEGRAPH BURN SCAR WILL EXPIRE AT 
230 AM MST EARLY THIS MORNING FOR PINAL COUNTY...

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

LAT...LON 3333 11103 3324 11099 3317 11109 3317 11116
      3322 11120 3326 11119 3331 11116 3334 11109

$$

Iniguez

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 5:36 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	6 hr
Jul 9, 5:36 PM MST	Special Weather Statement	PSR	Gila	24 min
Jul 9, 6:23 PM MST	Special Weather Statement	PSR		52 min
Jul 9, 7:45 PM MST	Special Weather Statement	PSR		30 min
Jul 9, 8:15 PM MST	Severe Thunderstorm Warning	PSR	Gila	45 min
Jul 9, 8:58 PM MST	Severe Thunderstorm Warning	PSR	Gila, Maricopa, Pinal	47 min
Jul 9, 9:18 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	4 hr
Jul 9, 9:18 PM MST	Special Weather Statement	PSR	Pinal	42 min
Jul 9, 9:32 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila, Pinal	4 hr
Jul 9, 9:39 PM MST	Severe Thunderstorm Warning	PSR	Gila, Maricopa, Pinal	36 min
Jul 9, 9:54 PM MST	Dust Storm Advisory	PSR	Maricopa, Pinal	51 min
Jul 9, 10:06 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	39 min
Jul 9, 10:21 PM MST	Dust Storm Warning	PSR	Maricopa, Pinal	54 min
Jul 9, 10:30 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	45 min
Jul 9, 10:44 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	31 min
Jul 9, 10:52 PM MST	Areal Flood Advisory	PSR	Maricopa, Pinal	3 hr
Jul 9, 11:12 PM MST	Dust Storm Advisory	PSR	Maricopa	63 min
Jul 9, 11:15 PM MST	Dust Storm Warning	PSR	Maricopa, Pinal	60 min
Jul 9, 11:19 PM MST	Severe Thunderstorm Warning	PSR	Pinal	26 min
Jul 9, 11:22 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	38 min
Jul 9, 11:31 PM MST	Dust Storm Advisory	PSR	Maricopa	44 min
Jul 9, 11:33 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa, Pinal	4 hr
Jul 10, 1:02 AM MST	Special Weather Statement	PSR	Yuma	28 min
Jul 10, 1:57 PM MST	Blowing Dust Advisory	PSR	Maricopa, Pinal	9 hr
Jul 10, 2:27 PM MST	Special Weather Statement	PSR	Gila	48 min
Jul 10, 3:15 PM MST	Special Weather Statement	PSR	Gila	45 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.