Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 11, NWS Flagstaff, AZ

July 3, 2021Gila County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Jul 3, 2021, 4:54 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 3, 2021, 4:54 PM MST (23:54 UTC)
Expired: Jul 3, 2021, 8:00 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), 60 km from the middle of the area, began a volume at 23:54 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, 11.9 hours before the alert went out and 88 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: 73 J/kg
Mixed-layer CIN: -207 J/kg
Mixed-layer LCL: 2075 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -35 m²/s²
0-3 km storm-relative helicity: 18 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

999 
WGUS55 KFGZ 032354
FFWFGZ
AZC007-040300-
/O.NEW.KFGZ.FF.W.0011.210703T2354Z-210704T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
454 PM MST Sat Jul 3 2021

The National Weather Service in Flagstaff has issued a

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

* Until 800 PM MST.

* At 453 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1.5 and 2.5 inches of 
  rain have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

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

  SOURCE...Doppler radar.

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

* Some locations that will experience flash flooding include...
  Deer Creek and Bear Creek.

Additional rainfall amounts of 0.75 to 1.5 inches are possible in 
the warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Flooding of washes and small creeks will occur, and some dirt roads 
will become muddy and impassable.

&&

LAT...LON 3410 11140 3409 11146 3402 11146 3400 11139
      3404 11136 3407 11131

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

$$

TPS

2 follow-up statements

882 
WGUS75 KFGZ 040051
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
551 PM MST Sat Jul 3 2021

AZC007-040300-
/O.CON.KFGZ.FF.W.0011.000000T0000Z-210704T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gila AZ-
551 PM MST Sat Jul 3 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING 
FOR GILA COUNTY...

At 549 PM MST, Doppler radar indicated thunderstorms have moved out 
of the warning area, but the flash flood threat remains. Between 2 
and 3 inches of rain have fallen.

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

SOURCE...Doppler radar.

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

Some locations that will experience flash flooding include...
  Deer Creek and Bear Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Flooding of washes and small creeks will occur, and some dirt roads 
will become muddy and impassable.

&&

LAT...LON 3410 11140 3409 11146 3402 11146 3400 11139
      3404 11136 3407 11131

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

$$

TPS

689 
WGUS75 KFGZ 040254
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
754 PM MST Sat Jul 3 2021

AZC007-040304-
/O.EXP.KFGZ.FF.W.0011.000000T0000Z-210704T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gila AZ-
754 PM MST Sat Jul 3 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 8 PM MST THIS EVENING FOR GILA 
COUNTY...

Light rain continues to fall over the warning area, but the 
thunderstorm and heavy rain threat has ended. Flooding is no longer 
expected. Please continue to heed remaining road closures.

LAT...LON 3410 11140 3409 11146 3402 11146 3400 11139
      3404 11136 3407 11131

$$

TPS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 3, 1:18 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Yavapai	4 hr
Jul 3, 1:43 PM MST	Areal Flood Advisory	FGZ	Coconino, Navajo	3 hr
Jul 3, 2:07 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 3, 2:25 PM MST	Special Weather Statement	FGZ	Yavapai	35 min
Jul 3, 3:03 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 3, 3:34 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 3, 4:10 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr

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.