Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 165, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this flash flood warning at Aug 10, 2021, 4:13 PM MST for Yavapai 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 10, 2021, 4:13 PM MST (23:13 UTC)
- Expired
- Aug 10, 2021, 7:15 PM MST
- In force
- 3 hr
- Issued by
- NWS Flagstaff, AZ
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Yavapai County, AZ
The radar
The Flagstaff radar (KFSX), 176 km from the middle of the area, began a volume at 23:15 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, 11.2 hours before the alert went out and 112 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
- 609 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 962 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- 44 m²/s²
- 0-3 km storm-relative helicity
- 118 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
893
WGUS55 KFGZ 102313
FFWFGZ
AZC025-110215-
/O.NEW.KFGZ.FF.W.0165.210810T2313Z-210811T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
413 PM MST Tue Aug 10 2021
The National Weather Service in Flagstaff has issued a
* Flash Flood Warning for...
Yavapai County in west central Arizona...
* Until 715 PM MST.
* At 412 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 1.5 inches 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...
Mount Hope, Cross Mountain and Walnut Creek Ranger Station.
This includes the following streams and drainages...
Burro Creek, Trout Creek, and Muddy Creek.
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.
&&
LAT...LON 3515 11333 3529 11298 3523 11299 3509 11280
3507 11271 3492 11271 3474 11333
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
Humphreys2 follow-up statements
460
WGUS75 KFGZ 110015
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
515 PM MST Tue Aug 10 2021
AZC025-110215-
/O.CON.KFGZ.FF.W.0165.000000T0000Z-210811T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yavapai AZ-
515 PM MST Tue Aug 10 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 715 PM MST THIS
EVENING FOR YAVAPAI COUNTY...
At 515 PM MST, Heavy rainfall has ended over the warned area. Flash
flooding will still remain a threat while flood waters recede.
HAZARD...Life-threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life-threatening flash flooding of low-water crossings,
creeks, normally dry washes and roads.
Some locations that will experience flash flooding include...
Mount Hope, Cross Mountain and Walnut Creek Ranger Station.
This includes the following streams and drainages...
Burro Creek, Trout Creek, and Muddy Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly or mountainous terrain, there are many low water crossings
which will become dangerous in heavy rain. Do not attempt to cross
flooded roads. Find an alternate route.
Remain alert for flooding even in locations not receiving rain.
Normally dry washes, slot canyons and creeks can become raging
killer currents in a matter of minutes, even from distant rainfall.
&&
LAT...LON 3515 11333 3529 11298 3523 11299 3509 11280
3507 11271 3492 11271 3474 11333
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
Humphreys937
WGUS75 KFGZ 110210
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
710 PM MST Tue Aug 10 2021
AZC025-110220-
/O.EXP.KFGZ.FF.W.0165.000000T0000Z-210811T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yavapai AZ-
710 PM MST Tue Aug 10 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 715 PM MST THIS EVENING FOR
YAVAPAI COUNTY...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
LAT...LON 3515 11333 3529 11298 3523 11299 3509 11280
3507 11271 3492 11271 3474 11333
$$
MCTThe office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 5:19 PM MST | Special Weather Statement | FGZ | 41 min | |
| Aug 9, 6:17 PM MST | Flash Flood Warning | FGZ | Yavapai | 3 hr |
| Aug 9, 6:56 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 34 min |
| Aug 9, 7:27 PM MST | Special Weather Statement | FGZ | 33 min | |
| Aug 9, 7:50 PM MST | Special Weather Statement | FGZ | Gila | 25 min |
| Aug 9, 8:44 PM MST | Special Weather Statement | FGZ | Gila | 46 min |
| Aug 9, 9:18 PM MST | Areal Flood Advisory | FGZ | Gila, Navajo | 3 hr |
| Aug 9, 9:32 PM MST | Special Weather Statement | FGZ | Gila | 43 min |
| Aug 10, 11:35 AM MST | Special Weather Statement | FGZ | 25 min | |
| Aug 10, 11:55 AM MST | Severe Thunderstorm Warning | FGZ | Coconino | 15 min |
| Aug 10, 12:02 PM MST | Flash Flood Warning | FGZ | Coconino | 3 hr |
| Aug 10, 12:14 PM MST | Special Weather Statement | FGZ | 31 min | |
| Aug 10, 12:46 PM MST | Flash Flood Warning | FGZ | Coconino | 3 hr |
| Aug 10, 12:59 PM MST | Flash Flood Warning | FGZ | Coconino, Yavapai | 3 hr |
| Aug 10, 1:22 PM MST | Flash Flood Warning | FGZ | Coconino, Yavapai | 53 min |
| Aug 10, 2:22 PM MST | Special Weather Statement | FGZ | Yavapai | 23 min |
| Aug 10, 2:26 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 32 min |
| Aug 10, 2:35 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 40 min |
| Aug 10, 2:43 PM MST | Flash Flood Warning | FGZ | Yavapai | 3 hr |
| Aug 10, 2:52 PM MST | Severe Thunderstorm Warning | FGZ | Coconino, Yavapai | 38 min |
| Aug 10, 3:11 PM MST | Flash Flood Warning | FGZ | Coconino, Yavapai | 3 hr |
| Aug 10, 3:46 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.