Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 7, NWS Phoenix, AZ

July 1, 2021Gila County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Jul 1, 2021, 8:16 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 1, 2021, 8:16 PM MST (03:16 UTC)
Expired: Jul 2, 2021, 12:15 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), 68 km from the middle of the area, began a volume at 03:18 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, 3.3 hours before the alert went out and 75 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: 140 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 3255 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 44 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

290 
WGUS55 KPSR 020316
FFWPSR
AZC007-020715-
/O.NEW.KPSR.FF.W.0007.210702T0316Z-210702T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
816 PM MST Thu Jul 1 2021

The National Weather Service in Phoenix has issued a

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

* Until 1215 AM MST.

* At 816 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain over the Bush Fire Burn Scar. Between 0.5 and 1 inch of 
  rain has fallen. Additional rainfall amounts up to 0.5 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

Excessive rainfall over the burn scar will result in debris flow 
moving through the Tonto Creek. The debris flow can consist of rock, 
mud, vegetation and other loose materials.

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

  SOURCE...Radar.

  IMPACT...Life threatening flash flooding of areas in and around
           the Bush Fire 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 254 and 256...and
	between mile markers 258 and 264.

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.

In hilly terrain there are hundreds of low water crossings which are 
potentially dangerous in heavy rain. Do not attempt to cross flooded 
roads. Find an alternate route.

&&

LAT...LON 3377 11122 3376 11123 3376 11124 3376 11125
      3378 11127 3381 11128 3382 11130 3380 11135
      3381 11138 3382 11137 3384 11139 3386 11139
      3388 11140 3388 11141 3390 11141 3392 11139
      3395 11137 3392 11131 3382 11126

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

$$

Iniguez

3 follow-up statements

913 
WGUS75 KPSR 020422
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
922 PM MST Thu Jul 1 2021

AZC007-020715-
/O.CON.KPSR.FF.W.0007.000000T0000Z-210702T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gila AZ-
922 PM MST Thu Jul 1 2021

...FLASH FLOOD WARNING FOR THE BUSH FIRE BURN SCAR REMAINS IN EFFECT 
UNTIL 1215 AM MST FRIDAY FOR GILA COUNTY...

At 922 PM MST, Doppler radar indicated thunderstorms producing heavy 
rain over the Bush Fire Burn Scar. Between 0.5 and 1.25 inches of 
rain has fallen. Additional rainfall amounts up to 0.5 inches are 
possible in the warned area. Flash flooding is ongoing or expected 
to begin shortly.

Excessive rainfall over the burn scar will result in debris flow 
moving through the Tonto Creek. The debris flow can consist of rock, 
mud, vegetation and other loose materials.

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

SOURCE...Radar.

IMPACT...Life threatening flash flooding of areas in and around
         the Bush Fire 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 254 and 264.

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.

In hilly terrain there are hundreds of low water crossings which are 
potentially dangerous in heavy rain. Do not attempt to cross flooded 
roads. Find an alternate route.

&&

LAT...LON 3377 11122 3376 11123 3376 11124 3376 11125
      3378 11127 3381 11128 3382 11130 3380 11135
      3381 11138 3382 11137 3384 11139 3386 11139
      3388 11140 3388 11141 3390 11141 3392 11139
      3395 11137 3392 11131 3382 11126

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

$$

Iniguez

697 
WGUS75 KPSR 020557
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
1057 PM MST Thu Jul 1 2021

AZC007-020715-
/O.CON.KPSR.FF.W.0007.000000T0000Z-210702T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gila AZ-
1057 PM MST Thu Jul 1 2021

...FLASH FLOOD WARNING FOR THE BUSH FIRE BURN SCAR REMAINS IN EFFECT 
UNTIL 1215 AM MST FRIDAY FOR GILA COUNTY...

At 1057 PM MST, Doppler radar indicated thunderstorms produced heavy 
rain of 0.5 to 1.25 inches over the Bush Fire Burn Scar. Flash 
flooding is ongoing or expected to begin shortly.

Excessive rainfall over the burn scar will result in debris flow 
moving through the Tonto Creek. The debris flow can consist of rock, 
mud, vegetation and other loose materials.

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

SOURCE...Radar.

IMPACT...Life threatening flash flooding of areas in and around
         the Bush Fire 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 254 and 264.

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.

In hilly terrain there are hundreds of low water crossings which are 
potentially dangerous in heavy rain. Do not attempt to cross flooded 
roads. Find an alternate route.

&&

LAT...LON 3377 11122 3376 11123 3376 11124 3376 11125
      3378 11127 3381 11128 3382 11130 3380 11135
      3381 11138 3382 11137 3384 11139 3386 11139
      3388 11140 3388 11141 3390 11141 3392 11139
      3395 11137 3392 11131 3382 11126

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

$$

Iniguez

970 
WGUS75 KPSR 020712
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
1212 AM MST Fri Jul 2 2021

AZC007-020722-
/O.EXP.KPSR.FF.W.0007.000000T0000Z-210702T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gila AZ-
1212 AM MST Fri Jul 2 2021

...FLASH FLOOD WARNING FOR THE BUSH FIRE BURN SCAR WILL EXPIRE AT 
1215 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 3377 11122 3376 11123 3376 11124 3376 11125
      3378 11127 3381 11128 3382 11130 3380 11135
      3381 11138 3382 11137 3384 11139 3386 11139
      3388 11140 3388 11141 3390 11141 3392 11139
      3395 11137 3392 11131 3382 11126

$$

JS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 1, 9:37 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	4 hr
Jul 1, 9:57 PM MST	Special Weather Statement	PSR		48 min
Jul 1, 10:22 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	4 hr
Jul 2, 4:00 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	4 hr
Jul 2, 4:12 PM MST	Special Weather Statement	PSR		33 min
Jul 2, 4:50 PM MST	Special Weather Statement	PSR	Gila	25 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.