Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 148, NWS Flagstaff, AZ

August 1, 2021Gila County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Aug 1, 2021, 8:59 PM MST for Gila County, Arizona. It was in force for 85 min. 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 1, 2021, 8:59 PM MST (03:59 UTC)
Expired: Aug 1, 2021, 10:24 PM MST
In force: 85 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Flood severity: None

County Gila County, AZ

The radar

The Flagstaff radar (KFSX), 47 km from the middle of the area, began a volume at 03:57 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, 4.0 hours before the alert went out and 100 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: 748 J/kg
Mixed-layer CIN: -58 J/kg
Mixed-layer LCL: 2842 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 6 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

753 
WGUS55 KFGZ 020359
FFWFGZ
AZC007-020700-
/O.NEW.KFGZ.FF.W.0148.210802T0359Z-210802T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
859 PM MST Sun Aug 1 2021

The National Weather Service in Flagstaff has issued a

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

* Until midnight MST.

* At 856 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1.25 and 1.75 inches of 
  rain have fallen. Additional rainfall amounts of 0.25 to 0.75 
  inches are possible in the warned area. Flash flooding is ongoing 
  or expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of low-water crossings, creeks,
           normally dry washes and roads.

* Some locations that will experience flash flooding include...
  mainly rural areas of Gila County

This includes the following streams and drainages...
  City Creek, Pine Creek, Hill Creek, East Verde River and Rock 
  Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

In hilly or mountainous terrain, there are many low water crossings 
which will become dangerous in heavy rain. Do not attempt to cross 
flooded roads. Find an alternate route.

Get out of washes and creeks if you are camping or hiking! Flooding 
is occurring or imminent and will inundate area drainages.

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

Report any flooding to local law enforcement and the NWS Flagstaff 
when you can do so safely.

&&

LAT...LON 3429 11166 3424 11156 3428 11150 3428 11140
      3423 11141 3420 11150 3428 11167

FLASH FLOOD...RADAR INDICATED

$$

DB

1 follow-up statement

356 
WGUS75 KFGZ 020524
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
1024 PM MST Sun Aug 1 2021

AZC007-020534-
/O.CAN.KFGZ.FF.W.0148.000000T0000Z-210802T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gila AZ-
1024 PM MST Sun Aug 1 2021

...FLASH FLOOD WARNING IS CANCELLED FOR GILA COUNTY...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding. Do not attempt to cross flooded roads. Turn 
around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

LAT...LON 3429 11166 3424 11156 3428 11150 3428 11140
      3423 11141 3420 11150 3428 11167

$$

DB

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 5:05 PM MST	Areal Flood Advisory	FGZ	Coconino	3 hr
Aug 1, 5:11 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Navajo	49 min
Aug 1, 5:22 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Aug 1, 5:28 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila, Navajo	5 hr
Aug 1, 5:49 PM MST	Areal Flood Advisory	FGZ	Coconino	3 hr
Aug 1, 5:49 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Apache, Navajo	3 hr
Aug 1, 6:04 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Aug 1, 6:20 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila, Navajo	3 hr
Aug 1, 7:55 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila	2 hr
Aug 1, 8:26 PM MST	Flash Flood Warning	FGZ	Gila	115 min
Aug 1, 9:47 PM MST	Special Weather Statement	FGZ		28 min
Aug 2, 1:59 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Apache	3 hr
Aug 2, 2:23 PM MST	Severe Thunderstorm Warning	FGZ	Apache, Navajo	22 min
Aug 2, 2:44 PM MST	Severe Thunderstorm Warning	FGZ	Apache, Navajo	31 min
Aug 2, 4:06 PM MST	Special Weather Statement	FGZ	Apache	39 min
Aug 2, 4:14 PM MST	Special Weather Statement	FGZ		31 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.