Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 24, NWS Flagstaff, AZ

July 14, 2021Coconino County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Jul 14, 2021, 1:47 PM MST for Coconino County, Arizona. It was in force for 5 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 14, 2021, 1:47 PM MST (20:47 UTC)
Expired: Jul 14, 2021, 7:15 PM MST
In force: 5 hr
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Coconino County, AZ

The radar

The Flagstaff radar (KFSX), 171 km from the middle of the area, began a volume at 20:49 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, 8.8 hours before the alert went out and 81 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: 17 J/kg
Mixed-layer CIN: -187 J/kg
Mixed-layer LCL: 1682 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 37 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

526 
WGUS55 KFGZ 142047
FFWFGZ
AZC005-142345-
/O.NEW.KFGZ.FF.W.0024.210714T2047Z-210714T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
147 PM MST Wed Jul 14 2021

The National Weather Service in Flagstaff has issued a

* Flash Flood Warning for...
  Coconino County in north central Arizona...

* Until 445 PM MST.

* At 145 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain in the Partridge Creek and Cataract Creek drainages 
  north of Interstate 40 and west of Highway 64 in rural Coconino 
  County. Between 1 and 2 inches of rain have fallen. Additional 
  rainfall amounts of 0.5 to 1.5 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...
  mainly rural areas of Coconino County

This includes the following streams and drainages...
  Miller Wash, Ash Fork Draw, Martin Dam Draw, Havasu Creek, 
  Pineveta Wash, Johnson Creek, Cataract Creek, Eightmile Creek, 
  Partridge Creek, Sandstone Wash and Monument 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 3576 11264 3576 11248 3581 11244 3586 11246
      3587 11243 3582 11240 3577 11243 3569 11231
      3526 11232 3536 11270

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

$$

JJ

4 follow-up statements

303 
WGUS75 KFGZ 142258
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
358 PM MST Wed Jul 14 2021

AZC005-142345-
/O.CON.KFGZ.FF.W.0024.000000T0000Z-210714T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coconino AZ-
358 PM MST Wed Jul 14 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 PM MST THIS 
AFTERNOON FOR COCONINO COUNTY...

At 357 PM MST, Doppler radar indicated thunderstorms producing heavy 
rain in the Partridge Creek, Martin Dam Draw, Monument Wash, and 
Cataract Creek drainages north of Interstate 40 and west of Highway 
64 in rural Coconino County. Between 1 and 2.5 inches of rain have 
fallen. Additional rainfall amounts of 0.25 to 0.75 inches are 
possible in the warned area through 5 PM. 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 Coconino County

This includes the following streams and drainages...
  Miller Wash, Ash Fork Draw, Martin Dam Draw, Havasu Creek, 
  Pineveta Wash, Johnson Creek, Cataract Creek, Eightmile Creek, 
  Partridge Creek, Sandstone Wash and Monument 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 3576 11264 3576 11248 3581 11244 3586 11246
      3587 11243 3582 11240 3577 11243 3569 11231
      3526 11232 3536 11270

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

$$

JJ

688 
WGUS55 KFGZ 142339
FFWFGZ
AZC005-150115-
/O.EXT.KFGZ.FF.W.0024.000000T0000Z-210715T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
439 PM MST Wed Jul 14 2021

The National Weather Service in Flagstaff has extended the

* Flash Flood Warning for...
  Coconino County in north central Arizona...

* Until 615 PM MST.

* At 437 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain in Partridge Creek, Martin Dam Draw, Monument Wash, and 
  Cataract Creek drainages north of Interstate 40 and west of 
  Highway 64 in rural Coconino County. Between 1 and 3.5 inches of 
  rain have fallen. Additional rainfall is moving into the area with 
  additional amounts of 0.5 to 1 inch possible. 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 Coconino County

This includes the following streams and drainages...
  Miller Wash, Ash Fork Draw, Martin Dam Draw, Havasu Creek, 
  Pineveta Wash, Johnson Creek, Cataract Creek, Eightmile Creek, 
  Partridge Creek, Sandstone Wash and Monument 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 3576 11264 3576 11248 3581 11244 3586 11246
      3587 11243 3582 11240 3577 11243 3569 11231
      3526 11232 3536 11270

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

$$

MCT

435 
WGUS55 KFGZ 150112
FFWFGZ
AZC005-150215-
/O.EXT.KFGZ.FF.W.0024.000000T0000Z-210715T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
612 PM MST Wed Jul 14 2021

The National Weather Service in Flagstaff has extended the

* Flash Flood Warning for...
  Coconino County in north central Arizona...

* Until 715 PM MST.

* At 610 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain in Partridge Creek, Martin Dam Draw, Monument Wash, and 
  Cataract Creek drainages north of Interstate 40 and west of 
  Highway 64 in rural Coconino County. Between 1 and 4 inches of 
  rain have fallen. Additional 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 Coconino County

This includes the following streams and drainages...
  Miller Wash, Ash Fork Draw, Martin Dam Draw, Havasu Creek, 
  Pineveta Wash, Johnson Creek, Cataract Creek, Eightmile Creek, 
  Partridge Creek, Sandstone Wash and Monument 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 3576 11264 3576 11248 3581 11244 3586 11246
      3587 11243 3582 11240 3577 11243 3569 11231
      3526 11232 3536 11270

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

$$

MCT

515 
WGUS75 KFGZ 150207
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
707 PM MST Wed Jul 14 2021

AZC005-150217-
/O.EXP.KFGZ.FF.W.0024.000000T0000Z-210715T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coconino AZ-
707 PM MST Wed Jul 14 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 715 PM MST THIS EVENING FOR 
COCONINO 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.

LAT...LON 3576 11264 3576 11248 3581 11244 3586 11246
      3587 11243 3582 11240 3577 11243 3569 11231
      3526 11232 3536 11270

$$

MCT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 5:20 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila, Yavapai	3 hr
Jul 13, 7:23 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Jul 14, 2:39 AM MST	Special Weather Statement	FGZ	Yavapai	36 min
Jul 14, 3:06 AM MST	Areal Flood Advisory	FGZ	Yavapai	111 min
Jul 14, 3:24 AM MST	Special Weather Statement	FGZ	Yavapai	36 min
Jul 14, 3:38 AM MST	Areal Flood Advisory	FGZ	Yavapai	2 hr
Jul 14, 3:59 AM MST	Special Weather Statement	FGZ	Yavapai	46 min
Jul 14, 4:24 AM MST	Areal Flood Advisory	FGZ	Yavapai	74 min
Jul 14, 4:30 AM MST	Special Weather Statement	FGZ		45 min
Jul 14, 4:45 AM MST	Special Weather Statement	FGZ		45 min
Jul 14, 5:23 AM MST	Special Weather Statement	FGZ		37 min
Jul 14, 9:53 AM MST	Flash Flood Watch	FGZ	Apache, Coconino, Navajo	17 hr
Jul 14, 2:13 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Jul 14, 2:39 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Jul 14, 2:57 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 14, 3:36 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Jul 14, 4:02 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	31 min
Jul 14, 4:24 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	111 min
Jul 14, 4:54 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Navajo	111 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.