Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 84, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this flash flood warning at Jul 22, 2021, 4:04 PM MST for Coconino County, Arizona. It was in force for 116 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
- Jul 22, 2021, 4:04 PM MST (23:04 UTC)
- Expired
- Jul 22, 2021, 6:00 PM MST
- In force
- 116 min
- 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), 150 km from the middle of the area, began a volume at 23:04 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, 11.1 hours before the alert went out and 189 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
- 196 J/kg
- Mixed-layer CIN
- -125 J/kg
- Mixed-layer LCL
- 1415 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 11 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
288
WGUS55 KFGZ 222304
FFWFGZ
AZC005-230100-
/O.NEW.KFGZ.FF.W.0084.210722T2304Z-210723T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
404 PM MST Thu Jul 22 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 600 PM MST.
* At 403 PM MST, Doppler radar indicated thunderstorms producing
heavy rain over the Antelope Creek basin. Between 0.5 and 1.5
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 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 Canyon Near Sr 98, Antelope Creek Basin, Glen Canyon
National Recreation Area.
This includes the following slot canyons...
Upper Antelope Canyon, Lower Antelope Canyon, Owl Canyon,
Rattlesnake Canyon and Ramshead Canyon.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Get out of Antelope Canyon and other area slot canyons immediately!
Deadly flash flooding is imminent or occurring!
&&
LAT...LON 3694 11143 3690 11138 3683 11133 3683 11139
3689 11143 3694 11144
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
McCollum2 follow-up statements
236
WGUS75 KFGZ 222352
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
452 PM MST Thu Jul 22 2021
AZC005-230100-
/O.CON.KFGZ.FF.W.0084.000000T0000Z-210723T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coconino AZ-
452 PM MST Thu Jul 22 2021
...FLASH FLOOD WARNING FOR THE ANTELOPE CREEK BASIN REMAINS IN
EFFECT UNTIL 6 PM MST THIS EVENING FOR COCONINO COUNTY...
At 451 PM MST, Doppler radar indicated thunderstorms producing heavy
rain earlier over the Antelope Creek basin have dissipated. Between
0.5 and 1.5 inches of rain have fallen. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Life-threatening flash flooding. Thunderstorms producing
flash flooding in and around the Antelope Creek basin.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of areas in and around
the Antelope Creek basin.
Some locations that will experience flash flooding include...
Page, Antelope Canyon Near Sr 98, Antelope Creek Basin.
This includes the following slot canyons...
Upper Antelope Canyon, Lower Antelope Canyon, Owl Canyon,
Rattlesnake Canyon and Ramshead Canyon.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Get out of Antelope Canyon and other area slot canyons immediately!
Deadly flash flooding is imminent or occurring!
&&
LAT...LON 3694 11143 3690 11138 3683 11133 3683 11139
3689 11143 3694 11144
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
McCollum382
WGUS75 KFGZ 230052
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
552 PM MST Thu Jul 22 2021
AZC005-230102-
/O.EXP.KFGZ.FF.W.0084.000000T0000Z-210723T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coconino AZ-
552 PM MST Thu Jul 22 2021
...FLASH FLOOD WARNING FOR THE ANTELOPE CREEK BASIN WILL EXPIRE AT 6
PM MST THIS EVENING FOR COCONINO COUNTY...
Flood waters have receded and heavy rain has ended. Flooding is no
longer expected to pose a threat along the Antelope Creek drainage.
LAT...LON 3694 11143 3690 11138 3683 11133 3683 11139
3689 11143 3694 11144
$$
McCollumThe office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 6:38 PM MST | Flash Flood Warning | FGZ | Gila | 3 hr |
| Jul 21, 6:53 PM MST | Flash Flood Warning | FGZ | Coconino | 112 min |
| Jul 22, 12:28 PM MST | Areal Flood Advisory | FGZ | Coconino | 3 hr |
| Jul 22, 2:10 PM MST | Flash Flood Warning | FGZ | Coconino | 3 hr |
| Jul 22, 3:01 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 44 min |
| Jul 22, 3:31 PM MST | Flash Flood Warning | FGZ | Coconino | 115 min |
| Jul 22, 3:58 PM MST | Flash Flood Warning | FGZ | Navajo | 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.