Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 39, NWS Flagstaff, AZ

July 16, 2021Gila County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Jul 16, 2021, 4:41 PM MST for Gila County, Arizona. It was in force for 3 hr. 2 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 16, 2021, 4:41 PM MST (23:41 UTC)
Expired: Jul 16, 2021, 7:45 PM MST
In force: 3 hr
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Gila County, AZ

The radar

The Flagstaff radar (KFSX), 34 km from the middle of the area, began a volume at 23:43 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 16, 5:57 PM MST	FLASH FLOOD	6 Nw Payson, AZ	FLASH FLOODING REPORTED ON HIGHWAY 87 BETWEEN PINE AND PAYSON. WATER RUNNING OVER THE ROAD WITH ONE LANE ALMOST COVERED.
Jul 16, 6:00 PM MST	FLASH FLOOD	4 Nw Payson, AZ	VIDEO FROM TWITTER OF A ROAD FLOODING IN THE EAST VERDE ESTATES NEIGHBORHOOD. LOCATION IS ESTIMATED.

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, 11.7 hours before the alert went out and 109 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: 487 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 1090 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 88 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

134 
WGUS55 KFGZ 162341
FFWFGZ
AZC007-170245-
/O.NEW.KFGZ.FF.W.0039.210716T2341Z-210717T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
441 PM MST Fri Jul 16 2021

The National Weather Service in Flagstaff has issued a

* Flash Flood Warning for...
  Gila County in east central Arizona...

* Until 745 PM MST.

* At 440 PM MST, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Flash flooding is ongoing or
  expected to begin shortly.

  HAZARD...Life threatening flash flooding. Heavy rain producing 
           flash flooding.

  SOURCE...Radar indicated.

  IMPACT...Life threatening flash flooding of creeks and streams, 
           urban areas, highways, streets and underpasses.

* Some locations that will experience flooding include...
  East Verde Estates.

This includes the following streams and drainages...
Webber Creek, Pine Creek, East Verde River, Sycamore Creek and Ash
Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to higher ground now. Act quickly to protect your life.

&&

LAT...LON 3434 11135 3430 11135 3424 11139 3427 11145
      3430 11143 3436 11140

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...2-3 INCHES IN 1 HOUR

$$

McCollum

2 follow-up statements

086 
WGUS75 KFGZ 170037
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
537 PM MST Fri Jul 16 2021

AZC007-170245-
/O.CON.KFGZ.FF.W.0039.000000T0000Z-210717T0245Z/
/00000.U.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gila AZ-
537 PM MST Fri Jul 16 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM MST THIS 
EVENING FOR GILA COUNTY...

At 536 PM MST, Doppler radar indicated thunderstorms producing heavy 
rain continued across the warned area. Between 4 and 6 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...
  East Verde Estates.

This includes the following highways...
	State Route 87 between mile markers 258 and 262.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to higher ground now. Act quickly to protect your life.

&&

LAT...LON 3434 11135 3430 11135 3424 11139 3427 11145
      3430 11143 3436 11140

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

$$

McCollum

521 
WGUS75 KFGZ 170237
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
737 PM MST Fri Jul 16 2021

AZC007-170247-
/O.EXP.KFGZ.FF.W.0039.000000T0000Z-210717T0245Z/
/00000.U.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gila AZ-
737 PM MST Fri Jul 16 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 745 PM MST THIS EVENING FOR 
GILA COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 3434 11135 3430 11135 3424 11139 3427 11145
      3430 11143 3436 11140

$$

MAS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 15, 5:20 PM MST	Areal Flood Advisory	FGZ	Yavapai	115 min
Jul 15, 6:33 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	27 min
Jul 15, 6:55 PM MST	Areal Flood Advisory	FGZ	Yavapai	3 hr
Jul 15, 8:21 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	114 min
Jul 16, 11:56 AM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Jul 16, 12:03 PM MST	Areal Flood Advisory	FGZ	Yavapai	2 hr
Jul 16, 12:36 PM MST	Areal Flood Advisory	FGZ	Coconino	2 hr
Jul 16, 12:52 PM MST	Special Weather Statement	FGZ		23 min
Jul 16, 1:16 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	29 min
Jul 16, 1:20 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	115 min
Jul 16, 1:24 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Navajo	51 min
Jul 16, 1:44 PM MST	Special Weather Statement	FGZ		46 min
Jul 16, 2:13 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Navajo	32 min
Jul 16, 2:25 PM MST	Areal Flood Advisory	FGZ	Coconino	3 hr
Jul 16, 2:59 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	61 min
Jul 16, 3:14 PM MST	Special Weather Statement	FGZ		31 min
Jul 16, 3:43 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	32 min
Jul 16, 4:18 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	12 min
Jul 16, 4:34 PM MST	Severe Thunderstorm Warning	FGZ	Gila	41 min
Jul 16, 4:48 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Gila	20 min
Jul 16, 4:59 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Yavapai	15 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.