Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 215, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this flash flood warning at Aug 18, 2021, 8:08 PM MST for Yavapai County, Arizona. It was in force for 6 hr. 1 report 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 18, 2021, 8:08 PM MST (03:08 UTC)
- Expired
- Aug 19, 2021, 2:15 AM MST
- In force
- 6 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), 101 km from the middle of the area, began a volume at 03:11 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 18, 8:08 PM MST | FLASH FLOOD | 1 Wnw Black Canyon City, AZ | AT 8:08 PM MST, EMERGENCY MANAGEMENT REPORTED A 4 FOOT RISE IN BLACK CANYON CREEK. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Phoenix, AZ (KPSR), launched 00:00Z, 3.1 hours before the alert went out and 83 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
- 510 J/kg
- Mixed-layer CIN
- -174 J/kg
- Mixed-layer LCL
- 1692 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 157 m²/s²
- 0-3 km storm-relative helicity
- 230 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.7
The text
As transmitted.
603
WGUS55 KFGZ 190308
FFWFGZ
AZC025-190715-
/O.NEW.KFGZ.FF.W.0215.210819T0308Z-210819T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
808 PM MST Wed Aug 18 2021
The National Weather Service in Flagstaff has issued a
* Flash Flood Warning for...
Yavapai County in west central Arizona...
* Until 1215 AM MST.
* At 808 PM MST, emergency management reported a 4 ft rise in Black
Canyon Creek. Flash flooding is ongoing in Black Canyon Creek and
will begin to impact low water crossings near Black Canyon City
and the Agua Fria River.
HAZARD...Life-threatening flash flooding. Thunderstorms
producing flash flooding.
SOURCE...Emergency management reported.
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
This includes the following highways...
Interstate 17 near mile marker 245.
This includes the following streams and drainages...
Agua Fria River, Black Canyon Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3424 11222 3424 11221 3422 11219 3420 11217
3419 11216 3412 11216 3410 11214 3407 11215
3406 11216 3406 11217 3410 11216 3411 11218
3418 11218 3419 11220
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
ET1 follow-up statement
793
WGUS55 KFGZ 190705
FFWFGZ
AZC025-190915-
/O.EXT.KFGZ.FF.W.0215.000000T0000Z-210819T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
1205 AM MST Thu Aug 19 2021
The National Weather Service in Flagstaff has extended the
* Flash Flood Warning for...
Yavapai County in west central Arizona...
* Until 215 AM MST.
* At 1205 AM MST, emergency management reported a 4 ft rise in Black
Canyon Creek. Flash flooding is ongoing in Black Canyon Creek and
will begin to impact low water crossings near Black Canyon City
and the Agua Fria River.
HAZARD...Life-threatening flash flooding. Thunderstorms
producing flash flooding.
SOURCE...Emergency management reported.
IMPACT...Life-threatening flash flooding of low-water
crossings, creeks, normally dry washes and roads.
* Some locations that will experience flash flooding include...
mainly rural areas of Yavapai County
This includes the following highways...
Interstate 17 near mile marker 245.
This includes the following streams and drainages...
Agua Fria River, Black Canyon Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
In hilly or mountainous terrain, there are many low water crossings
which will become dangerous in heavy rain. Do not attempt to cross
flooded roads. Find an alternate route.
&&
LAT...LON 3424 11222 3424 11221 3422 11219 3420 11217
3419 11216 3412 11216 3410 11214 3407 11215
3406 11216 3406 11217 3410 11216 3411 11218
3418 11218 3419 11220
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
HumphreysThe office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 5:13 PM MST | Flash Flood Warning | FGZ | Yavapai | 3 hr |
| Aug 18, 5:17 PM MST | Flash Flood Warning | FGZ | Coconino, Yavapai | 4 hr |
| Aug 18, 5:31 PM MST | Special Weather Statement | FGZ | Yavapai | 29 min |
| Aug 18, 5:43 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 23 min |
| Aug 18, 7:59 PM MST | Flash Flood Warning | FGZ | Gila | 4 hr |
| Aug 18, 10:41 PM MST | Areal Flood Warning | FGZ | Gila, Yavapai | 10 hr |
| Aug 18, 11:56 PM MST | Flash Flood Warning | FGZ | Coconino | 8 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.