Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 155, NWS Flagstaff, AZ

August 9, 2021Coconino County, Gila County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Aug 9, 2021, 4:42 PM MST for Coconino County, 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: Aug 9, 2021, 4:42 PM MST (23:42 UTC)
Expired: Aug 9, 2021, 7:45 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

The radar

The Flagstaff radar (KFSX), 18 km from the middle of the area, began a volume at 23:44 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, 11.7 hours before the alert went out and 86 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2142 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: -74 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

248 
WGUS55 KFGZ 092342
FFWFGZ
AZC005-007-100245-
/O.NEW.KFGZ.FF.W.0155.210809T2342Z-210810T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

* Until 745 PM MST.

* At 440 PM MST, Doppler radar and automated rain gauges 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...Radar and automated gauges.

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

* Some locations that will experience flash flooding include...
  Clints Well, Geronimo Estates, Clints Well Campground, Kehl 
  Springs Campground and Geronimo Boy Scout Camp.

This includes the following highways...
	State Route 87 between mile markers 279 and 292.

This includes the following streams and drainages...
  North Sycamore Creek, West Clear Creek, West Webber Creek, Clover 
  Creek, Clear Creek, Sycamore Creek, Pine Creek, Toms Creek, 
  Corduroy Wash, Bray Creek, Brady Canyon, Fossil Creek and Webber 
  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.

&&

LAT...LON 3453 11147 3468 11143 3471 11139 3469 11131
      3451 11128 3434 11135 3435 11140 3444 11143

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

$$

MCT

2 follow-up statements

414 
WGUS75 KFGZ 100042
FFSFGZ

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

AZC005-007-100245-
/O.CON.KFGZ.FF.W.0155.000000T0000Z-210810T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coconino AZ-Gila AZ-
542 PM MST Mon Aug 9 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM MST THIS 
EVENING FOR GILA AND COCONINO COUNTIES...

At 540 PM MST, Doppler radar indicated heavy rain has moved out of 
the warned area but light rain showers continue. Between 1.5 and 2.5 
inches of rain have already fallen. Additional rainfall amounts of 
0.1 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 and automated gauges.

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

Some locations that will experience flash flooding include...
  Clints Well, Geronimo Estates, Clints Well Campground, Kehl 
  Springs Campground and Geronimo Boy Scout Camp.

This includes the following highways...
	State Route 87 between mile markers 279 and 292.

This includes the following streams and drainages...
  North Sycamore Creek, West Clear Creek, West Webber Creek, Clover 
  Creek, Clear Creek, Sycamore Creek, Pine Creek, Toms Creek, 
  Corduroy Wash, Bray Creek, Jacks Canyon, East Verde River, Brady 
  Canyon, Fossil Creek and Webber 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.

&&

LAT...LON 3453 11147 3468 11143 3471 11139 3469 11131
      3451 11128 3434 11135 3435 11140 3444 11143

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

$$

MCT

453 
WGUS75 KFGZ 100241
FFSFGZ

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

AZC005-007-100251-
/O.EXP.KFGZ.FF.W.0155.000000T0000Z-210810T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coconino AZ-Gila AZ-
741 PM MST Mon Aug 9 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 745 PM MST THIS EVENING FOR 
CLINTS WELL IN COCONINO COUNTY AND AREAS EAST OF STRAWBERRY IN 
NORTHERN GILA COUNTY...

The heaviest rain has ended with light showers continuing over the 
warned area. Flooding is no longer expected to pose a threat. Please 
continue to heed remaining road closures.

LAT...LON 3453 11147 3468 11143 3471 11139 3469 11131
      3451 11128 3434 11135 3435 11140 3444 11143

$$

NL

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 8, 5:16 PM MST	Special Weather Statement	FGZ		44 min
Aug 9, 12:30 PM MST	Special Weather Statement	FGZ	Yavapai	30 min
Aug 9, 2:27 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	2 hr
Aug 9, 2:39 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Aug 9, 3:42 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Aug 9, 3:53 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Aug 9, 4:15 PM MST	Special Weather Statement	FGZ		30 min
Aug 9, 4:21 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	24 min
Aug 9, 4:51 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.