Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 187, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this flash flood warning at Aug 17, 2021, 12:41 PM MST for Coconino County, Arizona. It was in force for 3 hr. 4 reports 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
- Aug 17, 2021, 12:41 PM MST (19:41 UTC)
- Expired
- Aug 17, 2021, 3:45 PM MST
- In force
- 3 hr
- Issued by
- NWS Flagstaff, AZ
- Area
- Storm-based polygon
- Emergency
- Flash flood emergency
- Damage threat
- Catastrophic
- Flood severity
- None
County Coconino County, AZ
The radar
The Flagstaff radar (KFSX), 84 km from the middle of the area, began a volume at 19:44 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 |
|---|---|---|---|
| Aug 17, 12:46 PM MST | FLASH FLOOD | Mt. Elden Estates At La, AZ | TREES, LOGS, AND OTHER DEBRIS ARE NOW IN THE FLOW, WATER IS APPROXIMATELY 60-70’ WIDE OVERTOPPING THE ROAD, AND DEPTH IS ABOUT 2.5 - 3 FEET. |
| Aug 17, 12:55 PM MST | FLASH FLOOD | Linda Vista Drive, AZ | WATER HAS OVERTOPPED ROADWAY WITH DEBRIS. |
| Aug 17, 1:00 PM MST | FLASH FLOOD | Dortha Ave., AZ | WATER HAS OVERTOPPED THE BARRIERS AND OVERTOPPED THE ROADS WITH GREATER THAN 1.5 FEET WATER DEPTH. |
| Aug 17, 1:10 PM MST | FLASH FLOOD | Cedar Ave. And West St., AZ | SIGNIFICANT FLOODING NEAR SAFEWAY. CEDAR AVE. CLOSED BY THE CITY OF FLAGSTAFF. |
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, 7.7 hours before the alert went out and 16 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
- 984 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 829 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 135 m²/s²
- 0-3 km storm-relative helicity
- 154 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.8
The text
As transmitted.
771
WGUS55 KFGZ 171941
FFWFGZ
AZC005-172145-
/O.NEW.KFGZ.FF.W.0187.210817T1941Z-210817T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
1241 PM MST Tue Aug 17 2021
...FLASH FLOOD EMERGENCY FOR MUSEUM FIRE SCAR AREA...
The National Weather Service in Flagstaff has issued a
* Flash Flood Warning for...
The Museum Fire scar area in...
Coconino County in north central Arizona...
* Until 245 PM MST.
* At 1241 PM MST, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain over the Museum Fire scar area.
Up to 2 inches of rain have fallen. Additional rainfall amounts of
1 to 2 inches are possible in the warned area. Flash flooding is
ongoing or expected to begin shortly.
This is a FLASH FLOOD EMERGENCY for Museum Fire scar area. This is
a PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER GROUND NOW!
HAZARD...Life-threatening flash flooding. Thunderstorms
producing flash flooding in and around the Museum Fire
scar area.
SOURCE...Radar and automated gauges.
IMPACT...This is a PARTICULARLY DANGEROUS SITUATION. SEEK
HIGHER GROUND NOW! IMMEDIATE EVACUATION for areas in
and around the Museum Fire scar area.
* Some locations that will experience flash flooding include...
Flagstaff.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to higher ground now! This is an extremely dangerous and
life-threatening situation. Do not attempt to travel unless you are
fleeing an area subject to flooding or under an evacuation order.
Residents in the warned area should shelter in place, and stay away
from creeks and local drainages.
Do not drive across flooded streets. Flood waters and debris from
the Museum Fire scar will affect Mount Elden Estates, the Paradise
and Grandview Drive neighborhoods, as well as the Sunnyside
neighborhood of Flagstaff. The flood waters may include ash and
debris.
&&
LAT...LON 3526 11165 3527 11163 3528 11162 3527 11160
3525 11160 3525 11162 3524 11163 3522 11161
3521 11161 3520 11162 3522 11163 3524 11164
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CATASTROPHIC
$$
DB3 follow-up statements
457
WGUS75 KFGZ 172055
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
155 PM MST Tue Aug 17 2021
AZC005-172145-
/O.CON.KFGZ.FF.W.0187.000000T0000Z-210817T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coconino AZ-
155 PM MST Tue Aug 17 2021
...FLASH FLOOD EMERGENCY FOR MUSEUM FIRE SCAR AREA...
...FLASH FLOOD WARNING FOR THE MUSEUM FIRE SCAR AREA REMAINS IN
EFFECT UNTIL 245 PM MST THIS AFTERNOON FOR COCONINO COUNTY...
At 153 PM MST, Doppler radar indicates heavy rain has ended over the
Museum Fire scar area. Between 2 and 3 inches of rain have fallen.
Additional rainfall amounts up to 0.25 inches are possible in the
warned area. Local law enforcement reports flash flooding is ongoing
with several road closures north of Route 66 in Flagstaff.
This is a FLASH FLOOD EMERGENCY for Museum Fire scar area. This is a
PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER GROUND NOW!
HAZARD...Life-threatening flash flooding. Thunderstorms producing
flash flooding in and around the Museum Fire scar area.
SOURCE...Radar and automated gauges.
IMPACT...This is a PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER
GROUND NOW! IMMEDIATE EVACUATION for areas in and around
the Museum Fire scar area.
Some locations that will experience flash flooding include...
Flagstaff.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to higher ground now! This is an extremely dangerous and
life-threatening situation. Do not attempt to travel unless you are
fleeing an area subject to flooding or under an evacuation order.
Residents in the warned area should shelter in place, and stay away
from creeks and local drainages.
Do not drive across flooded streets. Flood waters and debris from
the Museum Fire scar will affect Mount Elden Estates, the Paradise
and Grandview Drive neighborhoods, as well as the Sunnyside
neighborhood of Flagstaff. The flood waters may include ash and
debris.
&&
LAT...LON 3526 11165 3527 11163 3528 11162 3527 11160
3525 11160 3525 11162 3524 11163 3522 11161
3521 11161 3520 11162 3522 11163 3524 11164
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CATASTROPHIC
$$
TPS543
WGUS55 KFGZ 172140
FFWFGZ
AZC005-172245-
/O.EXT.KFGZ.FF.W.0187.000000T0000Z-210817T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
240 PM MST Tue Aug 17 2021
...FLASH FLOOD EMERGENCY FOR MUSEUM FIRE SCAR AREA...
The National Weather Service in Flagstaff has extended the
* Flash Flood Warning for...
The Museum Fire scar area in...
Coconino County in north central Arizona...
* Until 345 PM MST.
* At 239 PM MST, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain over the Museum Fire scar area.
Between 2 and 4 inches of rain have fallen. Flash flooding is
ongoing.
This is a FLASH FLOOD EMERGENCY for Museum Fire scar area. This is
a PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER GROUND NOW!
HAZARD...Life-threatening flash flooding. Thunderstorms
producing flash flooding in and around the Museum Fire
scar area.
SOURCE...Radar and automated gauges.
IMPACT...This is a PARTICULARLY DANGEROUS SITUATION. SEEK
HIGHER GROUND NOW! IMMEDIATE EVACUATION for areas in
and around the Museum Fire scar area.
* Some locations that will experience flash flooding include...
Flagstaff.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to higher ground now! This is an extremely dangerous and
life-threatening situation. Do not attempt to travel unless you are
fleeing an area subject to flooding or under an evacuation order.
Residents in the warned area should shelter in place, and stay away
from creeks and local drainages.
Do not drive across flooded streets. Flood waters and debris from
the Museum Fire scar will affect Mount Elden Estates, the Paradise
and Grandview Drive neighborhoods, as well as the Sunnyside
neighborhood of Flagstaff. The flood waters may include ash and
debris.
&&
LAT...LON 3526 11165 3527 11163 3528 11162 3527 11160
3525 11160 3525 11162 3524 11163 3522 11161
3521 11161 3520 11162 3522 11163 3524 11164
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CATASTROPHIC
$$
DB179
WGUS75 KFGZ 172238
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
338 PM MST Tue Aug 17 2021
AZC005-172248-
/O.EXP.KFGZ.FF.W.0187.000000T0000Z-210817T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coconino AZ-
338 PM MST Tue Aug 17 2021
...FLASH FLOOD WARNING FOR THE MUSEUM FIRE SCAR AREA WILL EXPIRE AT
345 PM MST THIS AFTERNOON FOR COCONINO COUNTY...
Several roadways in Flagstaff are closed especially from Route 66
northward, but flood waters will continue to recede over the next
few hours. The heavy rain threat has ended. Please continue to heed
road closures.
A Flash Flood Watch remains in effect until 1100 PM MST Tuesday for
portions of north central Arizona, northeast Arizona and west
central Arizona.
LAT...LON 3526 11165 3527 11163 3528 11162 3527 11160
3525 11160 3525 11162 3524 11163 3522 11161
3521 11161 3520 11162 3522 11163 3524 11164
$$
TPSThe office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 5:04 PM MST | Flash Flood Warning | FGZ | Apache, Navajo | 3 hr |
| Aug 16, 6:33 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 27 min |
| Aug 16, 7:08 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 37 min |
| Aug 16, 7:37 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 23 min |
| Aug 16, 7:42 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 33 min |
| Aug 16, 7:57 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 33 min |
| Aug 16, 8:04 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 26 min |
| Aug 16, 8:21 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 24 min |
| Aug 16, 9:18 PM MST | Severe Thunderstorm Warning | FGZ | Gila | 42 min |
| Aug 16, 10:01 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 29 min |
| Aug 16, 10:33 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 25 min |
| Aug 17, 12:04 PM MST | Flash Flood Warning | FGZ | Coconino, Gila, Navajo | 3 hr |
| Aug 17, 12:15 PM MST | Flash Flood Warning | FGZ | Coconino | 60 min |
| Aug 17, 12:22 PM MST | Flash Flood Warning | FGZ | Coconino | 5 hr |
| Aug 17, 12:29 PM MST | Severe Thunderstorm Warning | FGZ | Coconino, Gila, Navajo | 46 min |
| Aug 17, 12:59 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 46 min |
| Aug 17, 1:06 PM MST | Flash Flood Warning | FGZ | Coconino | 5 hr |
| Aug 17, 1:16 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 44 min |
| Aug 17, 1:21 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 39 min |
| Aug 17, 1:28 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 47 min |
| Aug 17, 1:37 PM MST | Flash Flood Watch | FGZ | Apache, Coconino, Navajo | 9 hr |
| Aug 17, 2:03 PM MST | Flash Flood Warning | FGZ | Coconino | 5 hr |
| Aug 17, 2:09 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 51 min |
| Aug 17, 2:15 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 45 min |
| Aug 17, 2:18 PM MST | Flash Flood Warning | FGZ | Coconino | 5 hr |
| Aug 17, 3:03 PM MST | Flash Flood Warning | FGZ | Coconino | 3 hr |
| Aug 17, 3:42 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 33 min |
| Aug 17, 3:44 PM MST | Flash Flood Warning | FGZ | Coconino, Yavapai | 3 hr |
| Aug 17, 4:06 PM MST | Flash Flood Warning | FGZ | Coconino, Yavapai | 3 hr |
| Aug 17, 4:19 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 26 min |
| Aug 17, 4:22 PM MST | Flash Flood Warning | FGZ | Coconino | 3 hr |
| Aug 17, 4:46 PM MST | Flash Flood Warning | FGZ | 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.