Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 8, NWS Flagstaff, AZ

July 3, 2021Yavapai County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Jul 3, 2021, 3:03 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: Jul 3, 2021, 3:03 PM MST (22:03 UTC)
Expired: Jul 3, 2021, 6:00 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), 78 km from the middle of the area, began a volume at 22:04 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, 10.1 hours before the alert went out and 74 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: 203 J/kg
Mixed-layer CIN: -114 J/kg
Mixed-layer LCL: 1347 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 124 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

643 
WGUS55 KFGZ 032203
FFWFGZ
AZC025-040100-
/O.NEW.KFGZ.FF.W.0008.210703T2203Z-210704T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
303 PM MST Sat Jul 3 2021

The National Weather Service in Flagstaff has issued a

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

* Until 600 PM MST.

* At 301 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area near Ash Creek. Between 1 and 2 
  inches of rain have fallen. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Life-threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Doppler radar.

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

* Some locations that will experience flash flooding include...
  Cherry and Powell Springs Campground.

This includes the following streams and drainages...
  Oak Wash, Ash Creek, Verde River, Cienega Creek, Osborne Spring 
  Wash, Cherry Creek, Hackberry Wash, Racetrack Wash, Yarber Wash 
  and Little Hackberry Wash.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Stay away or be swept away! The banks of creeks and washes are 
unstable and unsafe during any flooding event.

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.

Remain alert for flooding even in locations not receiving rain. 
Normally dry washes, slot canyons and streams can become raging 
killer currents in a matter of minutes, even from distant rainfall.

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

&&

LAT...LON 3467 11216 3468 11207 3463 11203 3459 11202
      3459 11199 3459 11197 3460 11195 3458 11195
      3457 11201 3449 11208 3449 11212 3459 11216

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

$$

ET

2 follow-up statements

141 
WGUS75 KFGZ 032245
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
345 PM MST Sat Jul 3 2021

AZC025-040100-
/O.CON.KFGZ.FF.W.0008.000000T0000Z-210704T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yavapai AZ-
345 PM MST Sat Jul 3 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 6 PM MST THIS EVENING 
FOR YAVAPAI COUNTY...

At 339 PM MST, heavy rain had ended across the warned area. Between 
1 and 2 inches of fell earlier today. Flash flooding is likely to 
continue over the next 1-2 hours.

HAZARD...Life-threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Doppler radar.

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

Some locations that will experience flash flooding include...
  Cherry and Powell Springs Campground.

This includes the following streams and drainages...
  Oak Wash, Ash Creek, Verde River, Cienega Creek, Osborne Spring 
  Wash, Cherry Creek, Hackberry Wash, Racetrack Wash, Yarber Wash 
  and Little Hackberry Wash.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Stay away or be swept away! The banks of creeks and washes are 
unstable and unsafe during any flooding event.

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.

Remain alert for flooding even in locations not receiving rain. 
Normally dry washes, slot canyons and streams can become raging 
killer currents in a matter of minutes, even from distant rainfall.

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

&&

LAT...LON 3467 11216 3468 11207 3463 11203 3459 11202
      3459 11199 3459 11197 3460 11195 3458 11195
      3457 11201 3449 11208 3449 11212 3459 11216

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

$$

ET

114 
WGUS75 KFGZ 040052
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
552 PM MST Sat Jul 3 2021

AZC025-040102-
/O.EXP.KFGZ.FF.W.0008.000000T0000Z-210704T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yavapai AZ-
552 PM MST Sat Jul 3 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 6 PM MST THIS EVENING FOR 
YAVAPAI COUNTY...

The heavy rain has ended and flooding is no longer expected to pose 
a threat in the Ash Creek area. Please continue to heed remaining 
road closures.

LAT...LON 3467 11216 3468 11207 3463 11203 3459 11202
      3459 11199 3459 11197 3460 11195 3458 11195
      3457 11201 3449 11208 3449 11212 3459 11216

$$

TPS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 3, 1:18 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Yavapai	4 hr
Jul 3, 1:43 PM MST	Areal Flood Advisory	FGZ	Coconino, Navajo	3 hr
Jul 3, 2:07 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 3, 2:25 PM MST	Special Weather Statement	FGZ	Yavapai	35 min
Jul 3, 3:34 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 3, 4:10 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 3, 4:54 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila	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.