Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 176, NWS Flagstaff, AZ

August 13, 2021Yavapai County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Aug 13, 2021, 10:07 PM MST for Yavapai County, Arizona. It was in force for 53 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: Aug 13, 2021, 10:07 PM MST (05:07 UTC)
Expired: Aug 13, 2021, 11:00 PM MST
In force: 53 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Yavapai County, AZ

The radar

The Phoenix radar (KIWA), 143 km from the middle of the area, began a volume at 05:07 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

Phoenix, AZ (KPSR), launched 00:00Z, 5.1 hours before the alert went out and 113 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: 1603 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 2033 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

644 
WGUS55 KFGZ 140507
FFWFGZ
AZC025-140600-
/O.NEW.KFGZ.FF.W.0176.210814T0507Z-210814T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
1007 PM MST Fri Aug 13 2021

The National Weather Service in Flagstaff has issued a

* Flash Flood Warning for...
  The Tenderfoot Fire scar in...
  Yavapai County in west central Arizona...

* Until 1100 PM MST.

* At 1007 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain over the Tenderfoot Fire scar. Between 0.25 and 0.75 
  inches of rain have fallen. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Life-threatening flash flooding. Thunderstorms
           producing flash flooding in and around the Tenderfoot
           Fire scar.

  SOURCE...Radar.

  IMPACT...Life threatening flash flooding of areas in and around
           the Tenderfoot Fire scar.

* Some locations that will experience flash flooding include...
  Yarnell and Glen Ilah.

This includes the following highways...
	State Route 89 between mile markers 277 and 278.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Heavy rainfall over the Tenderfoot Fire scar will flood 
neighborhoods next to the scar and highway 89A south of Yarnell.

&&

LAT...LON 3421 11276 3422 11276 3423 11274 3423 11272
      3421 11274 3421 11275

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

$$

McCollum

1 follow-up statement

624 
WGUS75 KFGZ 140557
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
1057 PM MST Fri Aug 13 2021

AZC025-140607-
/O.EXP.KFGZ.FF.W.0176.000000T0000Z-210814T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yavapai AZ-
1057 PM MST Fri Aug 13 2021

...FLASH FLOOD WARNING FOR THE TENDERFOOT FIRE SCAR WILL EXPIRE AT 
11 PM MST THIS EVENING FOR YAVAPAI COUNTY...

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

A Flash Flood Watch remains in effect until 200 AM MST for portions 
of east central Arizona and west central Arizona.

LAT...LON 3421 11276 3422 11276 3423 11274 3423 11272
      3421 11274 3421 11275

$$

McCollum

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 13, 5:41 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	21 min
Aug 13, 6:09 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	25 min
Aug 13, 6:18 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	27 min
Aug 13, 7:00 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	15 min
Aug 13, 7:39 PM MST	Severe Thunderstorm Warning	FGZ	Gila	26 min
Aug 13, 8:09 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	36 min
Aug 13, 8:15 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila, Yavapai	2 hr
Aug 13, 8:38 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Yavapai	52 min
Aug 13, 9:03 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	42 min
Aug 13, 9:43 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	47 min
Aug 13, 9:51 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Aug 14, 3:06 PM MST	Severe Thunderstorm Warning	FGZ	Gila	39 min
Aug 14, 3:42 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Navajo	36 min
Aug 14, 3:58 PM MST	Severe Thunderstorm Warning	FGZ	Gila	29 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.