Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 95, NWS Flagstaff, AZ

July 23, 2021Coconino County, Yavapai County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Jul 23, 2021, 3:26 PM MST for Coconino County, Yavapai County, Arizona. It was in force for 3 hr. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 23, 2021, 3:26 PM MST (22:26 UTC)
Expired: Jul 23, 2021, 6:30 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, Yavapai County, AZ

The radar

The Flagstaff radar (KFSX), 80 km from the middle of the area, began a volume at 22:28 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.

What was reported inside it

Time	Report	Where	Remark
Jul 23, 3:55 PM MST	HEAVY RAIN 0.85	2 Nnw Page Springs, AZ	0.85 INCHES OF RAIN IN ABOUT 30 MINUTES FROM 325 PM TO 355 PM.
Jul 23, 4:00 PM MST	FLASH FLOOD	1 Wsw West Sedona, AZ	CORRECTS PREVIOUS FLASH FLOOD REPORT FROM 1 WSW WEST SEDONA. SEWER SPILL OCCURS IN CARROLL CANYON WASH AREA COMMUNICATIONS AND PUBLIC RELATIONS MANAGER LAUREN BROWNE FROM CITY OF SEDONA AT AROUND 4 P.M. ON JULY 23, 2021, RAIN WATER INUNDATED THE CITY OF SEDONA
Jul 23, 4:30 PM MST	FLASH FLOOD	5 Wsw West Sedona, AZ	2.5 FT RISE ON DRY CREEK STREAM GAUGE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 10.4 hours before the alert went out and 33 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: 503 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 915 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 109 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

745 
WGUS55 KFGZ 232226
FFWFGZ
AZC005-025-240130-
/O.NEW.KFGZ.FF.W.0095.210723T2226Z-210724T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
326 PM MST Fri Jul 23 2021

The National Weather Service in Flagstaff has issued a

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

* Until 630 PM MST.

* At 325 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain in Oak Creek Canyon drainage including Sedona and Page 
  Springs. Between 0.75 and 1.75 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...
  Sedona, Slide Rock State Park, Garland's Oak Creek Lodge, Junipine 
  Resort, Page Springs, Village At Oak Creek, Red Rock State Park, 
  Manzanita Campground, West Fork Of Oak Creek, Raymond Boy Scout 
  Camp.

This includes the following swimming holes...
Sycamore Falls, Lower Sycamore Falls "The Golden Pond", Paradise 
Forks, Pumphouse Wash, Slide Rock, Encinoso, Grasshopper Point, 
Midgely Bridge, Buddha Beach/Red Rock Crossing, Crescent Moon Ranch 
and Mormons Crossing.

This includes the following highways...
	State Route 89A between mile markers 359 and 391.
	State Route 179 between mile markers 300 and 313.
	Interstate 17 between mile markers 300 and 302.

This includes the following streams and drainages...
  Turkey Creek, Tule Tank Wash, Sycamore Creek, JD Dam Wash, West 
  Fork Oak Creek, Dry Creek, Spring Creek, Jacks Canyon, Verde 
  River, Dry Beaver Creek, Volunteer Wash, Coffee Creek, Rarick 
  Canyon, Rattlesnake Canyon, Oak Creek and Beaver 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 11202 3498 11193 3499 11191 3503 11196
      3505 11207 3519 11201 3504 11172 3468 11170
      3477 11204

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

$$

JJ

1 follow-up statement

232 
WGUS75 KFGZ 240123
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
623 PM MST Fri Jul 23 2021

AZC005-025-240133-
/O.EXP.KFGZ.FF.W.0095.000000T0000Z-210724T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coconino AZ-Yavapai AZ-
623 PM MST Fri Jul 23 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 630 PM MST THIS EVENING FOR 
COCONINO AND YAVAPAI COUNTIES...

The heavy rain has ended across the Sedona area. Lighter showers are 
expected to continue through the evening. Please heed any road 
closures and avoid driving through water covered roads.

A Flash Flood Watch remains in effect until 1200 AM MST Monday for 
portions of east central Arizona, north central Arizona, northeast 
Arizona and west central Arizona.

LAT...LON 3491 11202 3498 11193 3499 11191 3503 11196
      3505 11207 3519 11201 3504 11172 3468 11170
      3477 11204

$$

McCollum

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 7:01 PM MST	Areal Flood Warning	FGZ	Navajo	5 min
Jul 22, 7:06 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Navajo	3 hr
Jul 22, 8:08 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Apache, Navajo	3 hr
Jul 22, 10:06 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Apache, Gila, Navajo	4 hr
Jul 23, 12:57 AM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila	4 hr
Jul 23, 1:50 AM MST	Areal Flood Advisory	FGZ	Coconino, Gila, Yavapai	3 hr
Jul 23, 4:07 AM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	4 hr
Jul 23, 11:21 AM MST	Areal Flood Warning	FGZ	Gila	6 hr
Jul 23, 11:38 AM MST	Special Weather Statement	FGZ	Coconino	37 min
Jul 23, 12:07 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Yavapai	4 hr
Jul 23, 12:14 PM MST	Special Weather Statement	FGZ	Coconino	46 min
Jul 23, 12:19 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	2 hr
Jul 23, 12:51 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	114 min
Jul 23, 1:17 PM MST	Special Weather Statement	FGZ		43 min
Jul 23, 1:31 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	34 min
Jul 23, 2:12 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	2 hr
Jul 23, 2:24 PM MST	Special Weather Statement	FGZ	Yavapai	36 min
Jul 23, 2:59 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	7 hr
Jul 23, 3:43 PM MST	Special Weather Statement	FGZ	Navajo	47 min
Jul 23, 4:01 PM MST	Areal Flood Advisory	FGZ	Yavapai	3 hr
Jul 23, 4:28 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Navajo	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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.