Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 76, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this flash flood warning at Jul 21, 2021, 3:34 PM MST for Coconino County, Arizona. It was in force for 98 min. 1 report 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 21, 2021, 3:34 PM MST (22:34 UTC)
- Expired
- Jul 21, 2021, 5:12 PM MST
- In force
- 98 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), 180 km from the middle of the area, began a volume at 22:36 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 21, 4:00 PM MST | FLASH FLOOD | 1 Nne Grand Canyon Vill, AZ | BRIGHT ANGEL TRAIL WAS WASHED OUT FROM FLOODING. |
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, 10.6 hours before the alert went out and 100 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
- 77 J/kg
- Mixed-layer CIN
- -129 J/kg
- Mixed-layer LCL
- 1785 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- 20 m²/s²
- 0-3 km storm-relative helicity
- -11 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
460
WGUS55 KFGZ 212234
FFWFGZ
AZC005-220145-
/O.NEW.KFGZ.FF.W.0076.210721T2234Z-210722T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
334 PM MST Wed Jul 21 2021
The National Weather Service in Flagstaff has issued a
* Flash Flood Warning for...
Coconino County in north central Arizona...
* Until 645 PM MST.
* At 333 PM MST, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.5 and 1 inch of rain
has fallen. The expected rainfall rate is 1 to 2 inches in 1 hour.
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...
Yaqui Point At Grand Canyon, Shoshone Point At Grand Canyon, South
Rim Visitors Center, Maricopa Point At Grand Canyon, Hopi Point At
Grand Canyon, Cape Royal At Grand Canyon, Pima Point At Grand
Canyon, Hermit's Rest At Grand Canyon, Grand Canyon National Park
and Grand Canyon Village.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Move to higher ground now. Act quickly to protect your life.
Remain alert for flooding even in locations not receiving rain.
Normally dry washes, slot canyons and creeks can become raging
killer currents in a matter of minutes, even from distant rainfall.
Get out of washes and creeks if you are camping or hiking! Flooding
is occurring or imminent and will inundate area drainages.
&&
LAT...LON 3614 11224 3617 11204 3610 11184 3602 11184
3602 11225
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR
$$
EL3 follow-up statements
535
WGUS75 KFGZ 212255
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
355 PM MST Wed Jul 21 2021
AZC005-220145-
/O.CON.KFGZ.FF.W.0076.000000T0000Z-210722T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coconino AZ-
355 PM MST Wed Jul 21 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 PM MST THIS
EVENING FOR COCONINO COUNTY...
At 354 PM MST, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 0.5 and 1 inch of rain has
fallen. Additional rainfall amounts of 0.25 to 0.75 inches are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly in portions of the Grand Canyon.
HAZARD...Life-threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life-threatening flash flooding of low-water crossings,
creeks, normally dry washes and roads.
Some locations that will experience flash flooding include...
Yaqui Point At Grand Canyon, Shoshone Point At Grand Canyon, South
Rim Visitors Center, Maricopa Point At Grand Canyon, Hopi Point At
Grand Canyon, Cape Royal At Grand Canyon, Pima Point At Grand
Canyon, Hermit's Rest At Grand Canyon, Grand Canyon National Park
and Grand Canyon Village.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Move to higher ground now. Act quickly to protect your life.
Remain alert for flooding even in locations not receiving rain.
Normally dry washes, slot canyons and creeks can become raging
killer currents in a matter of minutes, even from distant rainfall.
Get out of washes and creeks if you are camping or hiking! Flooding
is occurring or imminent and will inundate area drainages.
&&
LAT...LON 3614 11224 3617 11204 3610 11184 3602 11184
3602 11225
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
EL577
WGUS75 KFGZ 212326
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
426 PM MST Wed Jul 21 2021
AZC005-220145-
/O.CON.KFGZ.FF.W.0076.000000T0000Z-210722T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coconino AZ-
426 PM MST Wed Jul 21 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 PM MST THIS
EVENING FOR COCONINO COUNTY...
At 424 PM MST, Doppler radar indicated rainfall intensity has
decreased across the warned area. Light to moderate rainfall is
occurring. Between 0.5 and 1 inch of rain has fallen. The threat for
flash flooding will continue in portions of the Grand Canyon in
steep terrain and as water drains.
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...
Yaqui Point At Grand Canyon, Shoshone Point At Grand Canyon, South
Rim Visitors Center, Maricopa Point At Grand Canyon, Hopi Point At
Grand Canyon, Cape Royal At Grand Canyon, Pima Point At Grand
Canyon, Hermit's Rest At Grand Canyon, Grand Canyon National Park
and Grand Canyon Village.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Move to higher ground now. Act quickly to protect your life.
Remain alert for flooding even in locations not receiving rain.
Normally dry washes, slot canyons and creeks can become raging
killer currents in a matter of minutes, even from distant rainfall.
Get out of washes and creeks if you are camping or hiking! Flooding
is occurring or imminent and will inundate area drainages.
&&
LAT...LON 3614 11224 3617 11204 3610 11184 3602 11184
3602 11225
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
EL115
WGUS75 KFGZ 220012
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
512 PM MST Wed Jul 21 2021
AZC005-220022-
/O.CAN.KFGZ.FF.W.0076.000000T0000Z-210722T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coconino AZ-
512 PM MST Wed Jul 21 2021
...FLASH FLOOD WARNING FOR PORTIONS OF THE GRAND CANYON IN COCONINO
COUNTY IS CANCELLED..
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road and trail closures as water drains off.
LAT...LON 3614 11224 3617 11204 3610 11184 3602 11184
3602 11225
$$
ELThe office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 6:16 PM MST | Special Weather Statement | FGZ | 29 min | |
| Jul 20, 7:32 PM MST | Severe Thunderstorm Warning | FGZ | Navajo | 28 min |
| Jul 20, 7:55 PM MST | Flash Flood Warning | FGZ | Navajo | 2 hr |
| Jul 20, 8:33 PM MST | Flash Flood Warning | FGZ | Navajo | 117 min |
| Jul 21, 12:17 AM MST | Flash Flood Warning | FGZ | Gila | 118 min |
| Jul 21, 2:38 AM MST | Flash Flood Watch | FGZ | Apache, Coconino, Gila, Navajo, Yavapai | 5 days |
| Jul 21, 10:19 AM MST | Special Weather Statement | FGZ | Yavapai | 26 min |
| Jul 21, 10:48 AM MST | Flash Flood Warning | FGZ | Yavapai | 2 hr |
| Jul 21, 12:03 PM MST | Special Weather Statement | FGZ | Yavapai | 42 min |
| Jul 21, 12:13 PM MST | Flash Flood Warning | FGZ | Yavapai | 56 min |
| Jul 21, 12:20 PM MST | Flash Flood Warning | FGZ | Yavapai | 114 min |
| Jul 21, 12:35 PM MST | Special Weather Statement | FGZ | 40 min | |
| Jul 21, 12:47 PM MST | Flash Flood Warning | FGZ | Coconino | 118 min |
| Jul 21, 12:54 PM MST | Special Weather Statement | FGZ | 36 min | |
| Jul 21, 1:06 PM MST | Flash Flood Warning | FGZ | Coconino | 92 min |
| Jul 21, 1:24 PM MST | Flash Flood Warning | FGZ | Coconino | 110 min |
| Jul 21, 1:27 PM MST | Flash Flood Warning | FGZ | Yavapai | 74 min |
| Jul 21, 1:57 PM MST | Special Weather Statement | FGZ | Yavapai | 48 min |
| Jul 21, 2:01 PM MST | Areal Flood Advisory | FGZ | Yavapai | 119 min |
| Jul 21, 2:05 PM MST | Flash Flood Warning | FGZ | Coconino | 2 hr |
| Jul 21, 2:22 PM MST | Areal Flood Advisory | FGZ | Coconino | 3 hr |
| Jul 21, 2:30 PM MST | Special Weather Statement | FGZ | 45 min | |
| Jul 21, 2:36 PM MST | Flash Flood Warning | FGZ | Yavapai | 54 min |
| Jul 21, 2:53 PM MST | Flash Flood Warning | FGZ | Coconino | 82 min |
| Jul 21, 2:57 PM MST | Flash Flood Warning | FGZ | Yavapai | 60 min |
| Jul 21, 2:59 PM MST | Flash Flood Warning | FGZ | Yavapai | 60 min |
| Jul 21, 3:21 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 26 min |
| Jul 21, 3:49 PM MST | Flash Flood Warning | FGZ | Yavapai | 3 hr |
| Jul 21, 4:35 PM MST | Flash Flood Warning | FGZ | Coconino | 115 min |
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.