Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 104, NWS Flagstaff, AZ

July 25, 2021Coconino County, Gila County, Yavapai County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Jul 25, 2021, 12:39 PM MST for Coconino County, Gila County, Yavapai 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 25, 2021, 12:39 PM MST (19:39 UTC)
Expired: Jul 25, 2021, 3:45 PM MST
In force: 3 hr
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

Counties Coconino County, AZ, Gila County, AZ, Yavapai County, AZ

The radar

The Flagstaff radar (KFSX), 44 km from the middle of the area, began a volume at 19:39 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

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 7.7 hours before the alert went out and 82 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: 4 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 803 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -30 m²/s²
0-3 km storm-relative helicity: 25 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

202 
WGUS55 KFGZ 251939
FFWFGZ
AZC005-007-025-252245-
/O.NEW.KFGZ.FF.W.0104.210725T1939Z-210725T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
1239 PM MST Sun Jul 25 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...
  Yavapai County in west central Arizona...

* Until 345 PM MST.

* At 1237 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across the West Clear Creek drainage near Camp Verde. 
  Between 0.75 and 1.5 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...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...
  Clear Creek Campgrounds.

This includes the following swimming holes...
	Bull Pen Day Use Area and West Clear Creek.

This includes the following highways...
	State Route 260 between mile markers 225 and 245.

This includes the following streams and drainages...
  West Clear Creek, Bull Run Creek, Horsetank Wash, Chasm Creek and 
  Fossil Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Flooding of washes and creeks will occur, some dirt roads will 
become muddy and impassable. Paved roads and underpasses could 
become flooded as well.

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.

&&

LAT...LON 3445 11176 3445 11181 3452 11185 3457 11167
      3457 11152 3449 11151 3448 11151

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

$$

TPS

2 follow-up statements

042 
WGUS75 KFGZ 252048
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
148 PM MST Sun Jul 25 2021

AZC005-007-025-252245-
/O.CON.KFGZ.FF.W.0104.000000T0000Z-210725T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coconino AZ-Gila AZ-Yavapai AZ-
148 PM MST Sun Jul 25 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 345 PM MST THIS 
AFTERNOON FOR GILA, COCONINO AND YAVAPAI COUNTIES...

At 146 PM MST, Doppler radar indicated thunderstorms have ended 
across the West Clear Creek drainage near Camp Verde. Between 0.75 
and 1.5 inches of rain have fallen. Additional rainfall amounts up 
to 0.25 inches are possible in the warned area. 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...
  Clear Creek Campgrounds.

This includes the following swimming holes...
	Bull Pen Day Use Area and West Clear Creek.

This includes the following highways...
	State Route 260 between mile markers 225 and 244.

This includes the following streams and drainages...
  West Clear Creek, Bull Run Creek, Horsetank Wash, Chasm Creek and 
  Fossil Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Flooding of washes and creeks will occur, some dirt roads will 
become muddy and impassable. Paved roads and underpasses could 
become flooded as well.

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.

&&

LAT...LON 3445 11176 3445 11181 3452 11185 3457 11167
      3457 11152 3449 11151 3448 11151

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

$$

TPS

212 
WGUS75 KFGZ 252243
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
343 PM MST Sun Jul 25 2021

AZC005-007-025-252253-
/O.EXP.KFGZ.FF.W.0104.000000T0000Z-210725T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coconino AZ-Gila AZ-Yavapai AZ-
343 PM MST Sun Jul 25 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 345 PM MST THIS AFTERNOON FOR 
GILA, COCONINO AND YAVAPAI COUNTIES...

The heavy rain threat has ended in the West Clear Creek drainage 
east of Camp Verde. Flooding is no longer expected to pose a threat. 
Please continue to heed remaining road closures.

A Flash Flood Watch remains in effect until 1200 AM MST Monday for 
portions of east central Arizona, north central Arizona, northeast 
Arizona and west central Arizona.

LAT...LON 3445 11176 3445 11181 3452 11185 3457 11167
      3457 11152 3449 11151 3448 11151

$$

TPS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 24, 5:30 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Navajo	30 min
Jul 24, 7:12 PM MST	Areal Flood Advisory	FGZ	Coconino, Navajo	3 hr
Jul 24, 7:50 PM MST	Areal Flood Advisory	FGZ	Coconino	3 hr
Jul 24, 8:49 PM MST	Areal Flood Advisory	FGZ	Coconino, Yavapai	3 hr
Jul 24, 9:32 PM MST	Areal Flood Advisory	FGZ	Yavapai	3 hr
Jul 24, 10:47 PM MST	Areal Flood Warning	FGZ	Navajo	6 hr
Jul 24, 11:06 PM MST	Areal Flood Advisory	FGZ	Apache, Coconino, Navajo	12 hr
Jul 25, 2:30 AM MST	Areal Flood Advisory	FGZ	Coconino, Navajo	24 hr
Jul 25, 2:51 AM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	6 hr
Jul 25, 4:58 AM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 25, 9:15 AM MST	Areal Flood Warning	FGZ	Apache, Coconino, Navajo	13 hr
Jul 25, 11:05 AM MST	Flash Flood Warning Considerable damage threat	FGZ	Navajo	11 hr
Jul 25, 1:51 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Jul 25, 2:27 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Yavapai	108 min
Jul 25, 2:52 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 25, 3:28 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	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.