Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 157, NWS Flagstaff, AZ

August 9, 2021Yavapai County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Aug 9, 2021, 6:17 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: Aug 9, 2021, 6:17 PM MST (01:17 UTC)
Expired: Aug 9, 2021, 9:15 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), 48 km from the middle of the area, began a volume at 01:18 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, 1.3 hours before the alert went out and 80 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: 285 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 1905 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 84 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

322 
WGUS55 KFGZ 100117
FFWFGZ
AZC025-100415-
/O.NEW.KFGZ.FF.W.0157.210810T0117Z-210810T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
617 PM MST Mon Aug 9 2021

The National Weather Service in Flagstaff has issued a

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

* Until 915 PM MST.

* At 615 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 inches of rain 
  have fallen. Additional rainfall amounts of 0.25 to 0.5 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly along West Clear Creek and Bull Run Creek leading 
  into the Verde River.

  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 237.

This includes the following streams and drainages...
  West Clear Creek, Verde River, Gap Creek, Walker Creek, and Bull 
  Run Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3461 11164 3455 11161 3439 11166 3439 11178
      3445 11181 3451 11184 3453 11180 3455 11172
      3457 11169

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

$$

MCT

2 follow-up statements

580 
WGUS75 KFGZ 100213
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
713 PM MST Mon Aug 9 2021

AZC025-100415-
/O.CON.KFGZ.FF.W.0157.000000T0000Z-210810T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yavapai AZ-
713 PM MST Mon Aug 9 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 PM MST THIS 
EVENING FOR YAVAPAI COUNTY...

At 711 PM MST, Doppler radar indicated heavy rain has ended across 
the warned area with light rain showers at this time. Between 1 and 
3 inches of rain have previously fallen. Flash flooding is ongoing 
or expected to begin shortly along West Clear Creek and Bull Run 
Creek into the Verde River.

HAZARD...Life-threatening flash flooding. Heavy rain 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 237.

This includes the following streams and drainages...
  West Clear Creek, Verde River, Gap Creek, Walker Creek, and Bull 
  Run Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3461 11164 3455 11161 3439 11166 3439 11178
      3445 11181 3451 11184 3453 11180 3455 11172
      3457 11169

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

$$

MCT

937 
WGUS75 KFGZ 100406
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
906 PM MST Mon Aug 9 2021

AZC025-100416-
/O.EXP.KFGZ.FF.W.0157.000000T0000Z-210810T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yavapai AZ-
906 PM MST Mon Aug 9 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 915 PM MST THIS EVENING FOR 
YAVAPAI COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures and use 
caution near any elevated water along West Clear Creek tonight.

LAT...LON 3461 11164 3455 11161 3439 11166 3439 11178
      3445 11181 3451 11184 3453 11180 3455 11172
      3457 11169

$$

MCT

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 5:19 PM MST	Special Weather Statement	FGZ		41 min
Aug 9, 6:56 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	34 min
Aug 9, 7:27 PM MST	Special Weather Statement	FGZ		33 min
Aug 9, 7:50 PM MST	Special Weather Statement	FGZ	Gila	25 min
Aug 9, 8:44 PM MST	Special Weather Statement	FGZ	Gila	46 min
Aug 9, 9:18 PM MST	Areal Flood Advisory	FGZ	Gila, Navajo	3 hr
Aug 9, 9:32 PM MST	Special Weather Statement	FGZ	Gila	43 min
Aug 10, 11:35 AM MST	Special Weather Statement	FGZ		25 min
Aug 10, 11:55 AM MST	Severe Thunderstorm Warning	FGZ	Coconino	15 min
Aug 10, 12:02 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Aug 10, 12:14 PM MST	Special Weather Statement	FGZ		31 min
Aug 10, 12:46 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Aug 10, 12:59 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Yavapai	3 hr
Aug 10, 1:22 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Yavapai	53 min
Aug 10, 2:22 PM MST	Special Weather Statement	FGZ	Yavapai	23 min
Aug 10, 2:26 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	32 min
Aug 10, 2:35 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	40 min
Aug 10, 2:43 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Aug 10, 2:52 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	38 min
Aug 10, 3:11 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Yavapai	3 hr
Aug 10, 3:46 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Aug 10, 4:13 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.