Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 167, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this flash flood warning at Aug 11, 2021, 1:38 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 11, 2021, 1:38 PM MST (20:38 UTC)
- Expired
- Aug 11, 2021, 4:45 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), 172 km from the middle of the area, began a volume at 20:40 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, 8.6 hours before the alert went out and 122 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
- 82 J/kg
- Mixed-layer CIN
- -165 J/kg
- Mixed-layer LCL
- 1265 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- 84 m²/s²
- 0-3 km storm-relative helicity
- 153 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
456
WGUS55 KFGZ 112038
FFWFGZ
AZC025-112345-
/O.NEW.KFGZ.FF.W.0167.210811T2038Z-210811T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
138 PM MST Wed Aug 11 2021
The National Weather Service in Flagstaff has issued a
* Flash Flood Warning for...
Yavapai County in west central Arizona...
* Until 445 PM MST.
* At 137 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...
mainly rural areas of Yavapai County
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
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 3495 11309 3492 11294 3483 11290 3469 11300
3470 11312 3478 11321
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
EL2 follow-up statements
487
WGUS75 KFGZ 112102
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
202 PM MST Wed Aug 11 2021
AZC025-112345-
/O.CON.KFGZ.FF.W.0167.000000T0000Z-210811T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yavapai AZ-
202 PM MST Wed Aug 11 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 PM MST THIS
AFTERNOON FOR YAVAPAI COUNTY...
At 200 PM MST, Doppler radar indicated that the heavy rainfall
produced by thunderstorms has decreased in intensity across the
warned area. Flash flooding is still expected as water drains.
Between 1 and 2 inches of rain have fallen.
HAZARD...Life-threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life-threatening flash flooding of low-water crossings,
creeks, normally dry washes and roads.
Some locations that will experience flash flooding include...
mainly rural areas of Yavapai County
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Remain alert for flooding even in locations not receiving rain.
Normally dry washes, slot canyons and creeks can become raging
killer currents in a matter of minutes, even from distant rainfall.
&&
LAT...LON 3495 11309 3492 11294 3483 11290 3469 11300
3470 11312 3478 11321
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
EL963
WGUS75 KFGZ 112340
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
440 PM MST Wed Aug 11 2021
AZC025-112350-
/O.EXP.KFGZ.FF.W.0167.000000T0000Z-210811T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yavapai AZ-
440 PM MST Wed Aug 11 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 445 PM MST THIS AFTERNOON FOR
YAVAPAI COUNTY...
The heavy rain has ended over western Yavapai County 20 miles north
of Bagdad in the Santa Maria Mountains. Flooding is no longer
expected to pose a threat. Please heed any road closures.
LAT...LON 3495 11309 3492 11294 3483 11290 3469 11300
3470 11312 3478 11321
$$
McCollumThe office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 9:30 AM MST | Flash Flood Warning | FGZ | Yavapai | 3 hr |
| Aug 11, 1:48 PM MST | Flash Flood Warning | FGZ | Coconino | 3 hr |
| Aug 11, 2:25 PM MST | Special Weather Statement | FGZ | 35 min | |
| Aug 11, 2:49 PM MST | Flash Flood Warning | FGZ | Apache | 3 hr |
| Aug 11, 3:11 PM MST | Special Weather Statement | FGZ | 34 min | |
| Aug 11, 4:24 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.