Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 7, NWS Flagstaff, AZ

July 3, 2021Yavapai County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Jul 3, 2021, 2:07 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, 2:07 PM MST (21:07 UTC)
Expired: Jul 3, 2021, 5:15 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), 69 km from the middle of the area, began a volume at 21:06 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, 9.1 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: 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.

234 
WGUS55 KFGZ 032107
FFWFGZ
AZC025-040015-
/O.NEW.KFGZ.FF.W.0007.210703T2107Z-210704T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
207 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 515 PM MST.

* At 204 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 0.5 and 1.5 inches of 
  rain have fallen across Dry Creek near Sedona. Light to moderate 
  rain continues with up to another 0.25-0.75" possible. 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...
  Dry Creek near Sedona in Yavapai County

This includes the following highways...
	State Route 89A between mile markers 366 and 369.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

A Flash Flood Warning means that flooding is imminent or occurring. 
If you are in the warned area move to higher ground immediately. 
Residents living along streams and creeks should take immediate 
precautions to protect life and property.

&&

LAT...LON 3490 11190 3490 11187 3489 11185 3486 11183
      3485 11183 3484 11185 3484 11186 3482 11187
      3479 11187 3479 11188 3481 11189 3486 11191

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

$$

ET

2 follow-up statements

796 
WGUS75 KFGZ 032318
FFSFGZ

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

AZC025-040015-
/O.CON.KFGZ.FF.W.0007.000000T0000Z-210704T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yavapai AZ-
418 PM MST Sat Jul 3 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 PM MST THIS 
AFTERNOON FOR YAVAPAI COUNTY...

At 417 PM MST, heavy rain had ended across the warned area. Between 
0.5 and 1.5 inches of rain fell earlier today. Flash flooding is 
likely to continue over the next hour.

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...
  mainly rural areas of Yavapai County

This includes the following highways...
	State Route 89A between mile markers 366 and 369.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

A Flash Flood Warning means that flooding is imminent or occurring. 
If you are in the warned area move to higher ground immediately. 
Residents living along streams and creeks should take immediate 
precautions to protect life and property.

&&

LAT...LON 3490 11190 3490 11187 3489 11185 3486 11183
      3485 11183 3484 11185 3484 11186 3482 11187
      3479 11187 3479 11188 3481 11189 3486 11191

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

$$

ET

576 
WGUS75 KFGZ 040007
FFSFGZ

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

AZC025-040017-
/O.EXP.KFGZ.FF.W.0007.000000T0000Z-210704T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yavapai AZ-
507 PM MST Sat Jul 3 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 515 PM MST THIS AFTERNOON FOR 
YAVAPAI COUNTY...

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

LAT...LON 3490 11190 3490 11187 3489 11185 3486 11183
      3485 11183 3484 11185 3484 11186 3482 11187
      3479 11187 3479 11188 3481 11189 3486 11191

$$

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, 2:25 PM MST	Special Weather Statement	FGZ	Yavapai	35 min
Jul 3, 3:03 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
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.