Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 110, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this flash flood warning at Jul 26, 2021, 4:29 PM MST for Apache County, Arizona. It was in force for 3 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
- Jul 26, 2021, 4:29 PM MST (23:29 UTC)
- Expired
- Jul 26, 2021, 7:30 PM MST
- In force
- 3 hr
- Issued by
- NWS Flagstaff, AZ
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Apache County, AZ
The radar
The Flagstaff radar (KFSX), 237 km from the middle of the area, began a volume at 23:32 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, 11.5 hours before the alert went out and 246 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
- 20 J/kg
- Mixed-layer CIN
- -105 J/kg
- Mixed-layer LCL
- 954 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 30 m²/s²
- 0-3 km storm-relative helicity
- 37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
574
WGUS55 KFGZ 262329
FFWFGZ
AZC001-270230-
/O.NEW.KFGZ.FF.W.0110.210726T2329Z-210727T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
429 PM MST Mon Jul 26 2021
The National Weather Service in Flagstaff has issued a
* Flash Flood Warning for...
Apache County in northeastern Arizona...
* Until 730 PM MST.
* At 429 PM MST, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen. 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...
Canyon De Chelly National Monument, Red Lake Chapter House, Del
Muerto, Upper Wheatfields, Wheatfields, Fort Defiance, Window
Rock, Sawmill, St. Michaels and Navajo Reservation.
This includes the following highways...
State Route 264 between mile markers 474 and 475.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly or mountainous terrain, there are many low water crossings
which will become dangerous in heavy rain. Do not attempt to cross
flooded roads. Find an alternate route.
&&
LAT...LON 3564 10905 3576 10934 3595 10948 3616 10953
3622 10937 3628 10905 3625 10905
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
Humphreys2 follow-up statements
639
WGUS75 KFGZ 270128
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
628 PM MST Mon Jul 26 2021
AZC001-270230-
/O.CON.KFGZ.FF.W.0110.000000T0000Z-210727T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Apache AZ-
628 PM MST Mon Jul 26 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 PM MST THIS
EVENING FOR APACHE COUNTY...
At 625 PM MST, heavy rain had moved out of the the warned area,
however flash flooding is expected to remain a threat while water
recedes.
HAZARD...Life-threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life-threatening flash flooding of low-water crossings,
creeks, normally dry washes and roads.
Some locations that will experience flash flooding include...
Canyon De Chelly National Monument, Red Lake Chapter House, Del
Muerto, Upper Wheatfields, Wheatfields, Fort Defiance, Window
Rock, Sawmill, St. Michaels and Navajo Reservation.
This includes the following highways...
State Route 264 between mile markers 474 and 475.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly or mountainous terrain, there are many low water crossings
which will become dangerous in heavy rain. Do not attempt to cross
flooded roads. Find an alternate route.
&&
LAT...LON 3564 10905 3576 10934 3595 10948 3616 10953
3622 10937 3628 10905 3625 10905
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
Humphreys048
WGUS75 KFGZ 270227
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
727 PM MST Mon Jul 26 2021
AZC001-270237-
/O.EXP.KFGZ.FF.W.0110.000000T0000Z-210727T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Apache AZ-
727 PM MST Mon Jul 26 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 730 PM MST THIS EVENING FOR
APACHE COUNTY...
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 3564 10905 3576 10934 3595 10948 3616 10953
3622 10937 3628 10905 3625 10905
$$
HumphreysThe office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 25, 7:05 PM MST | Flash Flood Warning | FGZ | Apache, Navajo | 3 hr |
| Jul 26, 12:38 PM MST | Special Weather Statement | FGZ | 37 min | |
| Jul 26, 3:21 PM MST | Special Weather Statement | FGZ | 39 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.