Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 165, NWS Phoenix, AZ

August 13, 2021Gila County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Aug 13, 2021, 3:36 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 13, 2021, 3:36 PM MST (22:36 UTC)
Expired: Aug 13, 2021, 7:45 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), 115 km from the middle of the area, began a volume at 22:39 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, 10.6 hours before the alert went out and 142 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: 1066 J/kg
Mixed-layer CIN: -78 J/kg
Mixed-layer LCL: 1319 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -26 m²/s²
0-3 km storm-relative helicity: 15 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

801 
WGUS55 KPSR 132236
FFWPSR
AZC007-140245-
/O.NEW.KPSR.FF.W.0165.210813T2236Z-210814T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
336 PM MST Fri Aug 13 2021

The National Weather Service in Phoenix has issued a

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

* Until 745 PM MST.

* At 336 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain over the Blue River Burn Scar. Between 0.5 and 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 the Blue River
           Burn Scar.

  SOURCE...Radar.

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

* Some locations that will experience flash flooding include...
  San Carlos.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3334 11045 3335 11052 3342 11059 3348 11055
      3354 11043 3357 11039 3348 11030 3342 11034
      3340 11038 3340 11041 3339 11042 3338 11044
      3337 11044 3336 11045

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

$$

MS

2 follow-up statements

211 
WGUS75 KPSR 140132
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
632 PM MST Fri Aug 13 2021

AZC007-140245-
/O.CON.KPSR.FF.W.0165.000000T0000Z-210814T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gila AZ-
632 PM MST Fri Aug 13 2021

...FLASH FLOOD WARNING FOR THE BLUE RIVER BURN SCAR REMAINS IN 
EFFECT UNTIL 745 PM MST THIS EVENING FOR GILA COUNTY...

At 632 PM MST, Doppler radar indicated thunderstorms producing heavy 
rain over the Blue River Burn Scar. Between 0.5 and 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 the Blue River Burn Scar.

SOURCE...Radar.

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

Some locations that will experience flash flooding include...
  San Carlos.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3334 11045 3335 11052 3342 11059 3348 11055
      3354 11043 3357 11039 3348 11030 3342 11034
      3340 11038 3340 11041 3339 11042 3338 11044
      3337 11044 3336 11045

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

$$

Rogers

762 
WGUS75 KPSR 140246
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
746 PM MST Fri Aug 13 2021

AZC007-140256-
/O.EXP.KPSR.FF.W.0165.000000T0000Z-210814T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gila AZ-
746 PM MST Fri Aug 13 2021

...FLASH FLOOD WARNING FOR THE BLUE RIVER BURN SCAR HAS EXPIRED FOR 
GILA COUNTY...

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

A Flash Flood Watch remains in effect until 500 PM MST Sunday for a 
portion of south central Arizona.

LAT...LON 3334 11045 3335 11052 3342 11059 3348 11055
      3354 11043 3357 11039 3348 11030 3342 11034
      3340 11038 3340 11041 3339 11042 3338 11044
      3337 11044 3336 11045

$$

Rogers

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 5:16 PM MST	Special Weather Statement	PSR	Yuma	44 min
Aug 12, 5:17 PM MST	Special Weather Statement	PSR	Yuma	43 min
Aug 12, 5:53 PM MST	Areal Flood Advisory	PSR	Yuma	3 hr
Aug 12, 6:28 PM MST	Special Weather Statement	PSR	La Paz	47 min
Aug 12, 6:30 PM MST	Special Weather Statement	PSR	Yuma	45 min
Aug 12, 6:42 PM MST	Areal Flood Advisory	PSR	La Paz	3 hr
Aug 12, 6:47 PM MST	Areal Flood Advisory	PSR	Maricopa, Yuma	3 hr
Aug 12, 6:50 PM MST	Severe Thunderstorm Warning	PSR	Yuma	40 min
Aug 12, 6:52 PM MST	Severe Thunderstorm Warning	PSR	La Paz	38 min
Aug 12, 7:16 PM MST	Flash Flood Warning Considerable damage threat	PSR	Yuma	4 hr
Aug 12, 7:25 PM MST	Severe Thunderstorm Warning	PSR	La Paz	50 min
Aug 12, 7:42 PM MST	Areal Flood Advisory	PSR	La Paz, Yuma	3 hr
Aug 12, 7:56 PM MST	Special Weather Statement	PSR	La Paz	49 min
Aug 12, 8:05 PM MST	Dust Storm Advisory	PSR	La Paz, Yuma	55 min
Aug 12, 8:48 PM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz, Yuma	4 hr
Aug 13, 2:50 PM MST	Special Weather Statement	PSR	Gila	40 min
Aug 13, 3:30 PM MST	Severe Thunderstorm Warning	PSR	Gila	45 min
Aug 13, 4:12 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	4 hr
Aug 13, 4:14 PM MST	Special Weather Statement	PSR	Gila	46 min
Aug 13, 4:34 PM MST	Severe Thunderstorm Warning	PSR	Gila, Maricopa, Pinal	41 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.