Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 13, NWS Flagstaff, AZ

July 8, 2021Yavapai County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Jul 8, 2021, 7:03 PM MST for 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 8, 2021, 7:03 PM MST (02:03 UTC)
Expired: Jul 8, 2021, 10:00 PM MST
In force: 3 hr
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Yavapai County, AZ

The radar

The Flagstaff radar (KFSX), 165 km from the middle of the area, began a volume at 02:05 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 00:00Z, 2.1 hours before the alert went out and 99 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: 216 J/kg
Mixed-layer CIN: -71 J/kg
Mixed-layer LCL: 2828 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 123 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

179 
WGUS55 KFGZ 090203
FFWFGZ
AZC025-090500-
/O.NEW.KFGZ.FF.W.0013.210709T0203Z-210709T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
703 PM MST Thu Jul 8 2021

The National Weather Service in Flagstaff has issued a

* Flash Flood Warning for...
  Yavapai County in west central Arizona...

* Until 1000 PM MST.

* At 659 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain along Turkey Canyon and Big Chino Wash from 5 to 10 
  miles south of Seligman. Between 1 and 2 inches of rain have 
  fallen. Additional rainfall amounts of 0.5 to 1 inch 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...
  mainly rural areas of Yavapai County

This includes the following streams and drainages...
  Turkey Canyon and Big Chino Wash.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 3506 11300 3514 11297 3520 11292 3523 11278
      3508 11271 3512 11279

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

$$

JJ

2 follow-up statements

685 
WGUS75 KFGZ 090331
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
831 PM MST Thu Jul 8 2021

AZC025-090500-
/O.CON.KFGZ.FF.W.0013.000000T0000Z-210709T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yavapai AZ-
831 PM MST Thu Jul 8 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 10 PM MST THIS 
EVENING FOR YAVAPAI COUNTY...

At 829 PM MST, Doppler radar indicated that heavy rain had ended 
along Turkey Canyon and Big Chino Wash from 5 to 10 miles south of 
Seligman. Between 1 and 2 inches of rain fell earlier this evening. 
Flash flooding is likely ongoing.

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...
  mainly rural areas of Yavapai County

This includes the following streams and drainages...
  Turkey Canyon, Big Chino Wash.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 3506 11300 3514 11297 3520 11292 3523 11278
      3508 11271 3512 11279

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

$$

JJ

731 
WGUS75 KFGZ 090454
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
954 PM MST Thu Jul 8 2021

AZC025-090504-
/O.EXP.KFGZ.FF.W.0013.000000T0000Z-210709T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yavapai AZ-
954 PM MST Thu Jul 8 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 10 PM MST THIS EVENING FOR 
YAVAPAI COUNTY...

The heavy rain has ended along Big Chino Wash and Turkey Canyon from 
5 to 10 miles south of Seligman. Increased flow will continue in 
these areas for a few more hours, but significant flooding is no 
longer expected. Please continue to watch for water in low water 
crossings.

LAT...LON 3506 11300 3514 11297 3520 11292 3523 11278
      3508 11271 3512 11279

$$

JJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 5:13 PM MST	Special Weather Statement	FGZ	Yavapai	32 min
Jul 8, 5:28 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	19 min
Jul 8, 6:25 PM MST	Special Weather Statement	FGZ	Yavapai	50 min
Jul 9, 3:02 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	28 min
Jul 9, 3:22 PM MST	Severe Thunderstorm Warning	FGZ	Gila	23 min
Jul 9, 3:33 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	27 min
Jul 9, 3:42 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	48 min
Jul 9, 3:45 PM MST	Areal Flood Advisory	FGZ	Yavapai	2 hr
Jul 9, 3:59 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 9, 4:26 PM MST	Areal Flood Advisory	FGZ	Yavapai	2 hr
Jul 9, 4:48 PM MST	Severe Thunderstorm Warning	FGZ	Gila	42 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.