Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 29, NWS Flagstaff, AZ

July 14, 2021Yavapai County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Jul 14, 2021, 4:24 PM MST for Yavapai County, Arizona. It was in force for 111 min. 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, 4:24 PM MST (23:24 UTC)
Expired: Jul 14, 2021, 6:15 PM MST
In force: 111 min
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), 67 km from the middle of the area, began a volume at 23:28 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, 11.4 hours before the alert went out and 43 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.

615 
WGUS55 KFGZ 142324
FFWFGZ
AZC025-150115-
/O.NEW.KFGZ.FF.W.0029.210714T2324Z-210715T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Flagstaff has issued a

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

* Until 615 PM MST.

* At 422 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 1.5 inches of 
  rain have fallen over the Dry Creek drainage. 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...
  Sedona and Red Rock State Park.

This includes the following swimming holes...
	Buddha Beach/Red Rock Crossing and Crescent Moon Ranch.

This includes the following highways...
	State Route 89A between mile markers 366 and 372.

This includes the following streams and drainages...
  Oak Creek, Turkey Creek, Dry Beaver Creek, Dry Creek and Spring 
  Creek.

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 3491 11191 3491 11180 3482 11179 3477 11183
      3477 11187

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

$$

MCT

2 follow-up statements

287 
WGUS75 KFGZ 150011
FFSFGZ

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

AZC025-150115-
/O.CON.KFGZ.FF.W.0029.000000T0000Z-210715T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yavapai AZ-
511 PM MST Wed Jul 14 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 PM MST THIS 
EVENING FOR YAVAPAI COUNTY...

At 510 PM MST, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 1 and 1.5 inches of rain have 
already fallen. Moderate rain continues at this time with additional 
rainfall amounts up to 0.25 inches 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...
  Sedona and Red Rock State Park.

This includes the following swimming holes...
	Buddha Beach/Red Rock Crossing and Crescent Moon Ranch.

This includes the following highways...
	State Route 89A between mile markers 367 and 372.

This includes the following streams and drainages...
  Oak Creek, Turkey Creek, Dry Beaver Creek, Dry Creek and Spring 
  Creek.

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 3491 11191 3491 11180 3482 11179 3477 11183
      3477 11187

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

$$

MCT

507 
WGUS75 KFGZ 150113
FFSFGZ

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

AZC025-150123-
/O.EXP.KFGZ.FF.W.0029.000000T0000Z-210715T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yavapai AZ-
613 PM MST Wed Jul 14 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 615 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 around any elevated water.

LAT...LON 3491 11191 3491 11180 3482 11179 3477 11183
      3477 11187

$$

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, 1:47 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	5 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, 4:54 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.