Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 161, NWS Flagstaff, AZ

August 10, 2021Coconino County, Yavapai County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Aug 10, 2021, 1:22 PM MST for Coconino County, 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 10, 2021, 1:22 PM MST (20:22 UTC)
Expired
Aug 10, 2021, 2:15 PM MST
In force
53 min
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), 91 km from the middle of the area, began a volume at 20:22 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, 8.4 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-pSkew-T log-p diagram, Flgstf/Belemont, AZ at 12:00Z on 2021-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 609 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Flgstf/Belemont, AZ at 12:00Z on 2021-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 44 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
609 J/kg
Mixed-layer CIN
-55 J/kg
Mixed-layer LCL
962 m above ground
0-6 km bulk shear
5 kt
0-1 km storm-relative helicity
44 m²/s²
0-3 km storm-relative helicity
118 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

581 
WGUS55 KFGZ 102022
FFWFGZ
AZC005-025-102115-
/O.NEW.KFGZ.FF.W.0161.210810T2022Z-210810T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
122 PM MST Tue Aug 10 2021

The National Weather Service in Flagstaff has issued a

* Flash Flood Warning for...
  The Rafael Fire scar in...
  Coconino County in north central Arizona...
  Yavapai County in west central Arizona...

* Until 215 PM MST.

* At 121 PM MST, Doppler radar and automated rain gauges indicated 
  thunderstorms producing heavy rain over the Rafael Fire scar. 
  Between 0.75 and 1.75 inches of rain have fallen. Additional 
  rainfall amounts of 0.5 to 1.5 inches are possible in the warned 
  area. Flash flooding is ongoing or expected to begin shortly.

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

  SOURCE...Radar and automated gauges.

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

* Some locations that will experience flash flooding include...
  Perkinsville, White Horse Lake Campground and Raymond Boy Scout 
  Camp.

This includes the following swimming holes...
Sycamore Falls, Lower Sycamore Falls "The Golden Pond", Paradise 
Forks and Parsons Spring along Sycamore Creek.

This includes the following streams and drainages...
  Verde River, Volunteer Wash, Sycamore Creek, JD Dam Wash, Spring 
  Creek, Railroad Draw, Coffee Creek, Bear Canyon and Tule Tank Wash.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Get to higher ground immediately! Flash flood waters and debris will 
inundate recreation trails crossing washes within and downstream of 
Sycamore Canyon and Creek, including Parsons and Dogie Trails.

&&

LAT...LON 3497 11221 3501 11216 3517 11207 3516 11205
      3516 11199 3517 11188 3518 11186 3503 11196
      3499 11191 3498 11193 3494 11199 3491 11202
      3478 11204 3488 11216 3494 11225

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

$$

Humphreys
1 follow-up statement
389 
WGUS75 KFGZ 102107
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
207 PM MST Tue Aug 10 2021

AZC005-025-102117-
/O.EXP.KFGZ.FF.W.0161.000000T0000Z-210810T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coconino AZ-Yavapai AZ-
207 PM MST Tue Aug 10 2021

...FLASH FLOOD WARNING FOR THE RAFAEL FIRE SCAR WILL EXPIRE AT 215 
PM MST THIS AFTERNOON FOR COCONINO AND YAVAPAI COUNTIES...

Flood waters have receded and the heavy rain has ended. Flooding is 
no longer expected to pose a threat. Please continue to heed 
remaining road closures.

LAT...LON 3497 11221 3501 11216 3517 11207 3516 11205
      3516 11199 3517 11188 3518 11186 3503 11196
      3499 11191 3498 11193 3494 11199 3491 11202
      3478 11204 3488 11216 3494 11225

$$

Humphreys

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 9, 5:19 PM MSTSpecial Weather StatementFGZ41 min
Aug 9, 6:17 PM MSTFlash Flood Warning Considerable damage threatFGZYavapai3 hr
Aug 9, 6:56 PM MSTSevere Thunderstorm WarningFGZYavapai34 min
Aug 9, 7:27 PM MSTSpecial Weather StatementFGZ33 min
Aug 9, 7:50 PM MSTSpecial Weather StatementFGZGila25 min
Aug 9, 8:44 PM MSTSpecial Weather StatementFGZGila46 min
Aug 9, 9:18 PM MSTAreal Flood AdvisoryFGZGila, Navajo3 hr
Aug 9, 9:32 PM MSTSpecial Weather StatementFGZGila43 min
Aug 10, 11:35 AM MSTSpecial Weather StatementFGZ25 min
Aug 10, 11:55 AM MSTSevere Thunderstorm WarningFGZCoconino15 min
Aug 10, 12:02 PM MSTFlash Flood Warning Considerable damage threatFGZCoconino3 hr
Aug 10, 12:14 PM MSTSpecial Weather StatementFGZ31 min
Aug 10, 12:46 PM MSTFlash Flood Warning Considerable damage threatFGZCoconino3 hr
Aug 10, 12:59 PM MSTFlash Flood Warning Considerable damage threatFGZCoconino, Yavapai3 hr
Aug 10, 2:22 PM MSTSpecial Weather StatementFGZYavapai23 min
Aug 10, 2:26 PM MSTSevere Thunderstorm WarningFGZYavapai32 min
Aug 10, 2:35 PM MSTSevere Thunderstorm WarningFGZYavapai40 min
Aug 10, 2:43 PM MSTFlash Flood Warning Considerable damage threatFGZYavapai3 hr
Aug 10, 2:52 PM MSTSevere Thunderstorm WarningFGZCoconino, Yavapai38 min
Aug 10, 3:11 PM MSTFlash Flood Warning Considerable damage threatFGZCoconino, Yavapai3 hr
Aug 10, 3:46 PM MSTFlash Flood Warning Considerable damage threatFGZYavapai3 hr
Aug 10, 4:13 PM MSTFlash Flood Warning Considerable damage threatFGZYavapai3 hr

Nearby

Flash Flood Warnings in Arizona, 2021Every 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.