Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 134, NWS Flagstaff, AZ

July 30, 2021Coconino County, Gila County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Jul 30, 2021, 4:09 PM MST for Coconino County, Gila County, Arizona. It was in force for 2 hr. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 30, 2021, 4:09 PM MST (23:09 UTC)
Expired: Jul 30, 2021, 6:37 PM MST
In force: 2 hr
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

Counties Coconino County, AZ, Gila County, AZ

The radar

The Flagstaff radar (KFSX), 22 km from the middle of the area, began a volume at 23:11 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.

What was reported inside it

Time	Report	Where	Remark
Jul 30, 4:26 PM MST	FLASH FLOOD	4 S Washington Park, AZ	WATER CASCADING THROUGH YARD. 1.10 INCHES MEASURED IN 40 MINUTES.
Jul 30, 5:40 PM MST	FLASH FLOOD	3 Ssw Washington Park, AZ	4 FOOT RISE ON THE EAST VERDE RIVER.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 11.2 hours before the alert went out and 109 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1217 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 39 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

659 
WGUS55 KFGZ 302309
FFWFGZ
AZC005-007-310215-
/O.NEW.KFGZ.FF.W.0134.210730T2309Z-210731T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
409 PM MST Fri Jul 30 2021

The National Weather Service in Flagstaff has issued a

* Flash Flood Warning for...
  Gila County in east central Arizona...
  Coconino County in north central Arizona...

* Until 715 PM MST.

* At 405 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain from Washington Park to Tonto Village. Flash flooding 
  is ongoing or expected to begin shortly.

  HAZARD...Life-threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Radar.

  IMPACT...Life-threatening flash flooding of low-water
           crossings, creeks, normally dry washes and roads.

* Some locations that will experience flash flooding include...
  Whispering Pines, Mead Ranch, Washington Park, Tonto Village, 
  Kohls Ranch, Water Wheel Burn At Houston Mesa Rd-N, Ponderosa 
  Campground, Upper Tonto Creek Campground, Kehl Springs Campground 
  and Bear Flat.

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

This includes the following highways...
	State Route 260 between mile markers 264 and 272.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3442 11135 3445 11135 3448 11132 3447 11127
      3446 11126 3443 11123 3437 11119 3435 11113
      3433 11106 3430 11103 3428 11106 3427 11112
      3429 11117 3430 11123 3434 11127 3438 11132

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

$$

Peterson

1 follow-up statement

028 
WGUS75 KFGZ 310137
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
637 PM MST Fri Jul 30 2021

AZC005-007-310147-
/O.CAN.KFGZ.FF.W.0134.000000T0000Z-210731T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coconino AZ-Gila AZ-
637 PM MST Fri Jul 30 2021

...FLASH FLOOD WARNING IS CANCELLED NEAR WASHINGTON PARK AND TONTO 
VILLAGE IN GILA AND COCONINO COUNTIES...

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

LAT...LON 3442 11135 3445 11135 3448 11132 3447 11127
      3446 11126 3443 11123 3437 11119 3435 11113
      3433 11106 3430 11103 3428 11106 3427 11112
      3429 11117 3430 11123 3434 11127 3438 11132

$$

EL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 5:05 PM MST	Special Weather Statement	FGZ	Coconino	40 min
Jul 29, 5:35 PM MST	Special Weather Statement	FGZ		25 min
Jul 29, 5:38 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	112 min
Jul 29, 6:45 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 29, 6:56 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Jul 29, 8:12 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila	5 hr
Jul 30, 5:58 AM MST	Areal Flood Warning	FGZ	Coconino	5 hr
Jul 30, 11:34 AM MST	Areal Flood Advisory	FGZ	Navajo	2 hr
Jul 30, 12:44 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	2 hr
Jul 30, 1:15 PM MST	Areal Flood Advisory	FGZ	Coconino	3 hr
Jul 30, 1:47 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 30, 2:01 PM MST	Special Weather Statement	FGZ		29 min
Jul 30, 2:18 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	27 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.