Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 15, NWS Flagstaff, AZ

July 10, 2021Gila County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Jul 10, 2021, 4:40 PM MST for Gila County, Arizona. It was in force for 3 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 10, 2021, 4:40 PM MST (23:40 UTC)
Expired: Jul 10, 2021, 7:45 PM MST
In force: 3 hr
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Gila County, AZ

The radar

The Flagstaff radar (KFSX), 21 km from the middle of the area, began a volume at 23:43 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

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 11.7 hours before the alert went out and 108 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: 110 J/kg
Mixed-layer CIN: -242 J/kg
Mixed-layer LCL: 2626 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

722 
WGUS55 KFGZ 102340
FFWFGZ
AZC007-110245-
/O.NEW.KFGZ.FF.W.0015.210710T2340Z-210711T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
440 PM MST Sat Jul 10 2021

The National Weather Service in Flagstaff has issued a

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

* Until 745 PM MST.

* At 439 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain over the Highline Fire scar. Between 0.5 and 1 inch of 
  rain has fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Life-threatening flash flooding. Thunderstorms
           producing flash flooding in and around the Highline
           Fire scar.

  SOURCE...Radar.

  IMPACT...Life threatening flash flooding of areas in and around
           the Highline Fire scar.

* Some locations that will experience flash flooding include...
  Water Wheel Burn At Houston Mesa Rd-N.

This includes the following swimming holes...
	Water Wheel Falls and Ellison Creek Cascades.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Get away from Ellison Creek and the East Verde River now! Avoid low 
water crossings, bridges and swimming holes!

&&

LAT...LON 3440 11117 3434 11118 3434 11127 3435 11129
      3436 11129 3437 11125 3442 11122 3441 11121
      3441 11120 3441 11119 3441 11118 3441 11117

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

$$

NL

2 follow-up statements

498 
WGUS75 KFGZ 110152
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
652 PM MST Sat Jul 10 2021

AZC007-110245-
/O.CON.KFGZ.FF.W.0015.000000T0000Z-210711T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gila AZ-
652 PM MST Sat Jul 10 2021

...FLASH FLOOD WARNING FOR THE HIGHLINE FIRE SCAR REMAINS IN EFFECT 
UNTIL 745 PM MST THIS EVENING FOR GILA COUNTY...

At 649 PM MST, heavy rainfall has ended over the Highline Fire Scar, 
but between 0.5 and 1.5 inches of rain quickly fell. As a result, 
flash flooding is expected through area drainages.

HAZARD...Life-threatening flash flooding. Thunderstorms producing
         flash flooding in and around the Highline Fire scar.

SOURCE...Radar.

IMPACT...Life threatening flash flooding of areas in and around
         the Highline Fire scar.

Some locations that will experience flash flooding include...
  Water Wheel Burn At Houston Mesa Rd-N.

This includes the following swimming holes...
	Water Wheel Falls and Ellison Creek Cascades.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Get away from Ellison Creek and the East Verde River now! Avoid low 
water crossings, bridges and swimming holes!

&&

LAT...LON 3440 11117 3434 11118 3434 11127 3435 11129
      3436 11129 3437 11125 3442 11122 3441 11121
      3441 11120 3441 11119 3441 11118 3441 11117

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

$$

RR

952 
WGUS75 KFGZ 110238
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
738 PM MST Sat Jul 10 2021

AZC007-110248-
/O.EXP.KFGZ.FF.W.0015.000000T0000Z-210711T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gila AZ-
738 PM MST Sat Jul 10 2021

...FLASH FLOOD WARNING FOR THE HIGHLINE FIRE SCAR WILL EXPIRE AT 745 
PM MST THIS EVENING FOR GILA COUNTY...

The heavy rain has ended, but expect to see elevated flow through 
area drainages, including Ellison Creek, for the next hour or so.

LAT...LON 3440 11117 3434 11118 3434 11127 3435 11129
      3436 11129 3437 11125 3442 11122 3441 11121
      3441 11120 3441 11119 3441 11118 3441 11117

$$

RR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 5:00 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	45 min
Jul 9, 5:11 PM MST	Special Weather Statement	FGZ		34 min
Jul 9, 5:21 PM MST	Special Weather Statement	FGZ	Yavapai	39 min
Jul 9, 5:32 PM MST	Severe Thunderstorm Warning	FGZ	Navajo	43 min
Jul 9, 5:40 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	35 min
Jul 9, 6:14 PM MST	Severe Thunderstorm Warning	FGZ	Navajo	46 min
Jul 9, 7:14 PM MST	Special Weather Statement	FGZ	Gila	46 min
Jul 10, 12:36 PM MST	Special Weather Statement	FGZ	Apache	24 min
Jul 10, 1:29 PM MST	Areal Flood Advisory	FGZ	Apache	2 hr
Jul 10, 1:38 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	31 min
Jul 10, 1:57 PM MST	Special Weather Statement	FGZ		33 min
Jul 10, 2:21 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	39 min
Jul 10, 2:40 PM MST	Areal Flood Advisory	FGZ	Gila	4 hr
Jul 10, 2:55 PM MST	Special Weather Statement	FGZ	Yavapai	50 min
Jul 10, 3:40 PM MST	Areal Flood Advisory	FGZ	Yavapai	3 hr
Jul 10, 4:18 PM MST	Severe Thunderstorm Warning	FGZ	Gila	27 min
Jul 10, 4:27 PM MST	Severe Thunderstorm Warning	FGZ	Apache, Navajo	48 min
Jul 10, 4:40 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Navajo	50 min
Jul 10, 4:51 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	24 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.