Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 227, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this flash flood warning at Sep 2, 2021, 5:27 PM MST for Coconino County, Arizona. It was in force for 5 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
- Sep 2, 2021, 5:27 PM MST (00:27 UTC)
- Expired
- Sep 2, 2021, 10:30 PM MST
- In force
- 5 hr
- Issued by
- NWS Flagstaff, AZ
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Coconino County, AZ
The radar
The Cedar City radar (KICX), 155 km from the middle of the area, began a volume at 00:27 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 00:00Z, 0.5 hours before the alert went out and 182 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.
- Mixed-layer CAPE
- 107 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 1467 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 7 m²/s²
- 0-3 km storm-relative helicity
- -36 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
113
WGUS55 KFGZ 030027
FFWFGZ
AZC005-030330-
/O.NEW.KFGZ.FF.W.0227.210903T0027Z-210903T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
527 PM MST Thu Sep 2 2021
The National Weather Service in Flagstaff has issued a
* Flash Flood Warning for...
The Antelope Creek basin in...
Coconino County in north central Arizona...
* Until 830 PM MST.
* At 526 PM MST, Doppler radar indicated thunderstorms producing
heavy rain over the Antelope Creek basin. Between 0.5 and 1 inch
of rain has fallen. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Life-threatening flash flooding. Thunderstorms
producing flash flooding in and around the Antelope
Creek basin.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of areas in and around
the Antelope Creek basin.
* Some locations that will experience flash flooding include...
Antelope Creek Basin, Antelope Canyon Near Sr 98, Glen Canyon
National Recreation Area, Antelope Canyon, Lake Powell and Navajo
Reservation.
This includes the following slot canyons...
Upper Antelope Canyon, Lower Antelope Canyon, Canyon X, Cardiac
Canyon, Owl Canyon, Rattlesnake Canyon, Mountain Sheep Canyon,
Ramshead Canyon, Wind Pebble Canyon and Porcupine Canyon.
This includes the following creeks, washes and rivers...
Antelope Creek, Sand Wash and Peach Wash.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Get out of Antelope Canyon and other area slot canyons immediately!
Deadly flash flooding is imminent or occurring!
&&
LAT...LON 3695 11143 3694 11142 3692 11135 3662 11124
3659 11141 3669 11143 3689 11143 3694 11144
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MCT4 follow-up statements
230
WGUS75 KFGZ 030124
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
624 PM MST Thu Sep 2 2021
AZC005-030330-
/O.CON.KFGZ.FF.W.0227.000000T0000Z-210903T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coconino AZ-
624 PM MST Thu Sep 2 2021
...FLASH FLOOD WARNING FOR THE ANTELOPE CREEK BASIN REMAINS IN
EFFECT UNTIL 830 PM MST THIS EVENING FOR COCONINO COUNTY...
At 623 PM MST, Doppler radar indicated heavy rain has ended with
light rain continuing at this time over the Antelope Creek basin.
Between 0.5 and 1 inch of rain fell earlier and runoff will lead to
flash flooding downstream along Antelope Creek and Antelope Canyon.
HAZARD...Life-threatening flash flooding. Thunderstorms producing
flash flooding in and around the Antelope Creek basin.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of areas in and around
the Antelope Creek basin.
Some locations that will experience flash flooding include...
Antelope Creek Basin, Antelope Canyon Near Sr 98, Glen Canyon
National Recreation Area, Antelope Canyon, Lake Powell and Navajo
Reservation.
This includes the following slot canyons...
Upper Antelope Canyon, Lower Antelope Canyon, Canyon X, Cardiac
Canyon, Owl Canyon, Rattlesnake Canyon, Mountain Sheep Canyon,
Ramshead Canyon, Wind Pebble Canyon and Porcupine Canyon.
This includes the following creeks, washes and rivers...
Antelope Creek, Sand Wash and Peach Wash.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Get out of Antelope Canyon and other area slot canyons immediately!
Deadly flash flooding is imminent or occurring!
&&
LAT...LON 3695 11143 3694 11142 3692 11135 3662 11124
3659 11141 3669 11143 3689 11143 3694 11144
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MCT162
WGUS55 KFGZ 030325
FFWFGZ
AZC005-030530-
/O.EXT.KFGZ.FF.W.0227.000000T0000Z-210903T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
825 PM MST Thu Sep 2 2021
The National Weather Service in Flagstaff has extended the
* Flash Flood Warning for...
The Antelope Creek basin in...
Coconino County in north central Arizona...
* Until 1030 PM MST.
* At 824 PM MST, Doppler radar indicated additional thunderstorms
producing heavy rain over the Antelope Creek basin. Between 0.5
and 1 inch of rain has already fallen. Additional rainfall amounts
of 0.25 to 0.75 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 Antelope
Creek basin.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of areas in and around
the Antelope Creek basin.
* Some locations that will experience flash flooding include...
Antelope Creek Basin, Antelope Canyon Near Sr 98, Glen Canyon
National Recreation Area, Antelope Canyon, Lake Powell and Navajo
Reservation.
This includes the following slot canyons...
Upper Antelope Canyon, Lower Antelope Canyon, Canyon X, Cardiac
Canyon, Owl Canyon, Rattlesnake Canyon, Mountain Sheep Canyon,
Ramshead Canyon, Wind Pebble Canyon and Porcupine Canyon.
This includes the following creeks, washes and rivers...
Antelope Creek, Sand Wash and Peach Wash.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Get out of Antelope Canyon and other area slot canyons immediately!
Deadly flash flooding is imminent or occurring!
&&
LAT...LON 3695 11143 3694 11142 3692 11135 3662 11124
3659 11141 3669 11143 3689 11143 3694 11144
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MCT596
WGUS75 KFGZ 030424
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
924 PM MST Thu Sep 2 2021
AZC005-030530-
/O.CON.KFGZ.FF.W.0227.000000T0000Z-210903T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coconino AZ-
924 PM MST Thu Sep 2 2021
...FLASH FLOOD WARNING FOR THE ANTELOPE CREEK BASIN REMAINS IN
EFFECT UNTIL 1030 PM MST THIS EVENING FOR COCONINO COUNTY...
At 923 PM MST, Doppler radar indicated light rain continues over the
Antelope Creek basin at this time. Between 0.5 and 1 inch of rain
has fallen. Additional rainfall amounts of 0.1 to 0.25 inches are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Life-threatening flash flooding. Heavy rain producing
flash flooding in and around the Antelope Creek basin.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of areas in and around
the Antelope Creek basin.
Some locations that will experience flash flooding include...
Antelope Creek Basin, Antelope Canyon Near Sr 98, Glen Canyon
National Recreation Area, Antelope Canyon, Lake Powell and Navajo
Reservation.
This includes the following slot canyons...
Upper Antelope Canyon, Lower Antelope Canyon, Canyon X, Cardiac
Canyon, Owl Canyon, Rattlesnake Canyon, Mountain Sheep Canyon,
Ramshead Canyon, Wind Pebble Canyon and Porcupine Canyon.
This includes the following creeks, washes and rivers...
Antelope Creek, Sand Wash and Peach Wash.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Get out of Antelope Canyon and other area slot canyons immediately!
Deadly flash flooding is imminent or occurring!
&&
LAT...LON 3695 11143 3694 11142 3692 11135 3662 11124
3659 11141 3669 11143 3689 11143 3694 11144
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MCT864
WGUS75 KFGZ 030521
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
1021 PM MST Thu Sep 2 2021
AZC005-030531-
/O.EXP.KFGZ.FF.W.0227.000000T0000Z-210903T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coconino AZ-
1021 PM MST Thu Sep 2 2021
...FLASH FLOOD WARNING FOR THE ANTELOPE CREEK BASIN WILL EXPIRE AT
1030 PM MST THIS EVENING FOR COCONINO COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to use caution near the Antelope Creek
drainage which will likely see elevated water levels tonight.
LAT...LON 3695 11143 3694 11142 3692 11135 3662 11124
3659 11141 3669 11143 3689 11143 3694 11144
$$
MCTThe office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 2, 5:20 PM MST | Flash Flood Warning | FGZ | Coconino, Yavapai | 3 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.