Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 138, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this flash flood warning at Aug 1, 2021, 3:58 PM MST for Gila County, Navajo 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
- Aug 1, 2021, 3:58 PM MST (22:58 UTC)
- Expired
- Aug 1, 2021, 7:00 PM MST
- In force
- 3 hr
- Issued by
- NWS Flagstaff, AZ
- Area
- Storm-based polygon
- Flood severity
- None
Counties Gila County, AZ, Navajo County, AZ
The radar
The Flagstaff radar (KFSX), 132 km from the middle of the area, began a volume at 22:58 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
Phoenix, AZ (KPSR), launched 12:00Z, 11.0 hours before the alert went out and 181 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
- 445 J/kg
- Mixed-layer CIN
- -135 J/kg
- Mixed-layer LCL
- 2155 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 12 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
893
WGUS55 KFGZ 012258
FFWFGZ
AZC007-017-020200-
/O.NEW.KFGZ.FF.W.0138.210801T2258Z-210802T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
358 PM MST Sun Aug 1 2021
The National Weather Service in Flagstaff has issued a
* Flash Flood Warning for...
Gila County in east central Arizona...
Navajo County in north central Arizona...
* Until 700 PM MST.
* At 357 PM MST, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 1.5 inches of
rain have 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...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of low-water crossings, creeks,
normally dry washes and roads.
* Some locations that will experience flash flooding include...
Whiteriver, Rainbow City, Fort Apache, Turkey Creek, Fort Apache
Reservation and East Fork.
This includes the following highways...
State Route 73 between mile markers 325 and 334...and
between mile markers 336 and 345.
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.
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 3377 11018 3384 11016 3385 11014 3393 10991
3380 10990
FLASH FLOOD...RADAR INDICATED
$$
DB1 follow-up statement
833
WGUS75 KFGZ 020153
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
653 PM MST Sun Aug 1 2021
AZC007-017-020203-
/O.EXP.KFGZ.FF.W.0138.000000T0000Z-210802T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gila AZ-Navajo AZ-
653 PM MST Sun Aug 1 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 7 PM MST THIS EVENING FOR GILA
AND NAVAJO COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3377 11018 3384 11016 3385 11014 3393 10991
3380 10990
$$
DBThe office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 5:22 PM MST | Areal Flood Advisory | FGZ | Yavapai | 113 min |
| Jul 31, 6:08 PM MST | Areal Flood Advisory | FGZ | Apache, Navajo | 3 hr |
| Aug 1, 12:03 PM MST | Special Weather Statement | FGZ | 27 min | |
| Aug 1, 12:15 PM MST | Special Weather Statement | FGZ | 30 min | |
| Aug 1, 12:53 PM MST | Special Weather Statement | FGZ | Coconino | 22 min |
| Aug 1, 1:08 PM MST | Special Weather Statement | FGZ | 22 min | |
| Aug 1, 1:14 PM MST | Special Weather Statement | FGZ | 31 min | |
| Aug 1, 1:30 PM MST | Special Weather Statement | FGZ | Navajo | 30 min |
| Aug 1, 1:38 PM MST | Special Weather Statement | FGZ | Coconino | 22 min |
| Aug 1, 1:53 PM MST | Special Weather Statement | FGZ | 37 min | |
| Aug 1, 2:03 PM MST | Special Weather Statement | FGZ | Navajo | 27 min |
| Aug 1, 2:26 PM MST | Special Weather Statement | FGZ | Navajo | 34 min |
| Aug 1, 2:55 PM MST | Special Weather Statement | FGZ | 35 min | |
| Aug 1, 3:12 PM MST | Special Weather Statement | FGZ | 33 min | |
| Aug 1, 3:15 PM MST | Special Weather Statement | FGZ | 30 min | |
| Aug 1, 3:21 PM MST | Special Weather Statement | FGZ | 24 min | |
| Aug 1, 4:18 PM MST | Areal Flood Advisory | FGZ | Coconino | 3 hr |
| Aug 1, 4:24 PM MST | Special Weather Statement | FGZ | 51 min | |
| Aug 1, 4:38 PM MST | Severe Thunderstorm Warning | FGZ | Apache, Navajo | 37 min |
| Aug 1, 4:51 PM MST | Flash Flood Warning | FGZ | Gila, Navajo | 3 hr |
| Aug 1, 4:52 PM MST | Flash Flood Warning | FGZ | Apache, Coconino, 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.