Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 20, NWS Phoenix, AZ

July 4, 2021Gila County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Jul 4, 2021, 4:10 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: Jul 4, 2021, 4:10 PM MST (23:10 UTC)
Expired: Jul 4, 2021, 8:15 PM 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), 98 km from the middle of the area, began a volume at 23:12 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, 11.2 hours before the alert went out and 122 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: 118 J/kg
Mixed-layer CIN: -191 J/kg
Mixed-layer LCL: 1320 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: -24 m²/s²
0-3 km storm-relative helicity: 37 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

262 
WGUS55 KPSR 042310
FFWPSR
AZC007-050315-
/O.NEW.KPSR.FF.W.0020.210704T2310Z-210705T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
410 PM MST Sun Jul 4 2021

The National Weather Service in Phoenix has issued a

* Flash Flood Warning for...
  The Griffin and Copper Canyon burn scar in...
  Gila County in east central Arizona...

* Until 815 PM MST.

* At 410 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain over the Griffin and Copper Canyon Burn Scars. Between 
  1 and 3 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 the Griffin and
           Copper Canyon Burn Scars.

  SOURCE...Radar.

  IMPACT...Life threatening flash flooding of areas in and around
           the Griffin and Copper Canyon Burn Scars.

This includes the following highways...
	US Highway 60 between mile markers 256 and 265.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move away from recently burned areas. Life-threatening flooding of 
creeks, roads and normally dry arroyos is likely. The heavy rains 
will likely trigger rockslides, mudslides and debris flows in steep 
terrain, especially in and around these areas.

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

&&

LAT...LON 3342 11058 3341 11070 3345 11075 3360 11079
      3363 11077 3363 11057 3357 11050

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

$$

Rogers

3 follow-up statements

473 
WGUS75 KPSR 050052
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
552 PM MST Sun Jul 4 2021

AZC007-050315-
/O.CON.KPSR.FF.W.0020.000000T0000Z-210705T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gila AZ-
552 PM MST Sun Jul 4 2021

...FLASH FLOOD WARNING FOR THE GRIFFIN AND COPPER CANYON BURN SCARS 
REMAINS IN EFFECT UNTIL 815 PM MST THIS EVENING FOR GILA COUNTY...

At 552 PM MST, Doppler radar indicated thunderstorms producing heavy 
rain over the Griffin and Copper Canyon Burn Scars. Between 1 and 3 
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 the Griffin and Copper
         Canyon Burn Scars.

SOURCE...Radar.

IMPACT...Life threatening flash flooding of areas in and around
         the Griffin and Copper Canyon Burn Scars.

This includes the following highways...
	US Highway 60 between mile markers 256 and 265.

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 Griffin and Copper Canyon Burn Scars. 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 3342 11058 3341 11070 3345 11075 3360 11079
      3363 11077 3363 11057 3357 11050

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

$$

Rogers

666 
WGUS75 KPSR 050207
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
707 PM MST Sun Jul 4 2021

AZC007-050315-
/O.CON.KPSR.FF.W.0020.000000T0000Z-210705T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gila AZ-
707 PM MST Sun Jul 4 2021

...FLASH FLOOD WARNING FOR THE GRIFFIN AND COPPER CANYON BURN SCAR 
REMAINS IN EFFECT UNTIL 815 PM MST THIS EVENING FOR GILA COUNTY...

At 707 PM MST, Doppler radar indicated thunderstorms producing heavy 
rain over the Griffin and Copper Canyon Burn Scar. Between 1 and 3 
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 the Griffin and Copper
         Canyon Burn Scar.

SOURCE...Radar.

IMPACT...Life threatening flash flooding of areas in and around
         the Griffin and Copper Canyon Burn Scar.

This includes the following highways...
	US Highway 60 between mile markers 256 and 265.

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 Griffin and Copper Canyon 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 3342 11058 3341 11070 3345 11075 3360 11079
      3363 11077 3363 11057 3357 11050

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

$$

Rogers

298 
WGUS75 KPSR 050312
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
812 PM MST Sun Jul 4 2021

AZC007-050322-
/O.EXP.KPSR.FF.W.0020.000000T0000Z-210705T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gila AZ-
812 PM MST Sun Jul 4 2021

...FLASH FLOOD WARNING FOR THE GRIFFIN AND COPPER CANYON BURN SCAR 
WILL EXPIRE AT 815 PM MST THIS EVENING 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 3342 11058 3341 11070 3345 11075 3360 11079
      3363 11077 3363 11057 3357 11050

$$

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, 6:23 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila, Maricopa	4 hr
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, 4:36 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.