Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 242, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Sep 1, 2021, 7:18 PM MST for Gila County, Maricopa County, Arizona. It was in force for 88 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Sep 1, 2021, 7:18 PM MST (02:18 UTC)
- Expired
- Sep 1, 2021, 8:46 PM MST
- In force
- 88 min
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Gila County, AZ, Maricopa County, AZ
The radar
The Phoenix radar (KIWA), 59 km from the middle of the area, began a volume at 02:18 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 00:00Z, 2.3 hours before the alert went out and 61 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
- 518 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 1794 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 65 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
820
WGUS55 KPSR 020218
FFWPSR
AZC007-013-021015-
/O.NEW.KPSR.FF.W.0242.210902T0218Z-210902T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
718 PM MST Wed Sep 1 2021
The National Weather Service in Phoenix has issued a
* Flash Flood Warning for...
The Bush burn scar in...
Gila County in east central Arizona...
Maricopa County in south central Arizona...
* Until 315 AM MST Thursday.
* At 718 PM MST, Doppler radar indicated thunderstorms producing
heavy rain over the Bush Burn Scar. Between 0.5 and 1 inch of rain
has fallen. Additional rainfall amounts up to 0.5 inches are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
Excessive rainfall over the burn scar will result in debris flow
moving through the Bush burn scar. The debris flow can consist of
rock, mud, vegetation and other loose materials.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding in and around the Bush Burn
Scar.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of areas in and around
the Bush Burn Scar.
* Some locations that will experience flash flooding include...
Ballantine Trailhead, Round Valley, Sugarloaf Mountain, Sunflower
and Rio Verde.
This includes the following streams and drainages...
Picadilla Creek, Verde River, Boulder Creek, Mesquite Wash, Camp
Creek, South Fork Sheep Creek, Salt River, Indian Spring Wash,
Sycamore Creek, Cottonwood Creek and Ironwood Wash.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This is a life threatening situation. Heavy rainfall will cause
extensive and severe flash flooding of creeks...streams...and
ditches in the Bush Burn Scar. Severe debris flows can also be
anticipated across roads. Roads and driveways may be washed away in
places. If you encounter flood waters...climb to safety.
Move away from recently burned areas. Life-threatening flooding of
creeks, roads and normally dry arroyos is likely. The heavy rains
will likely trigger rockslides, mudslides and debris flows in steep
terrain, especially in and around these areas.
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3369 11132 3364 11153 3377 11177 3393 11157
3393 11149 3385 11139 3384 11139
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
Hirsch1 follow-up statement
661
WGUS75 KPSR 020346
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
846 PM MST Wed Sep 1 2021
AZC007-013-020356-
/O.CAN.KPSR.FF.W.0242.000000T0000Z-210902T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gila AZ-Maricopa AZ-
846 PM MST Wed Sep 1 2021
...FLASH FLOOD WARNING FOR THE BUSH BURN SCAR IS CANCELLED FOR GILA
AND MARICOPA COUNTIES...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
A Flash Flood Watch remains in effect until 500 AM MST Thursday for
portions of south central Arizona and southwest Arizona.
LAT...LON 3369 11132 3364 11153 3377 11177 3393 11157
3393 11149 3385 11139 3384 11139
$$
HirschThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 1, 5:17 PM MST | Special Weather Statement | PSR | 58 min | |
| Sep 1, 5:45 PM MST | Flash Flood Warning | PSR | Maricopa | 3 hr |
| Sep 1, 9:35 PM MST | Areal Flood Advisory | PSR | Maricopa, Pinal | 6 hr |
| Sep 1, 10:09 PM MST | Flash Flood Warning | PSR | Maricopa | 5 hr |
| Sep 1, 11:09 PM MST | Areal Flood Advisory | PSR | Maricopa, Pinal | 7 hr |
| Sep 2, 12:41 AM MST | Areal Flood Advisory | PSR | Maricopa, Pinal | 3 hr |
| Sep 2, 1:52 AM MST | Areal Flood Advisory | PSR | Pinal | 3 hr |
| Sep 2, 5:22 AM MST | Areal Flood Advisory | PSR | Pinal | 4 hr |
| Sep 2, 6:11 AM MST | Areal Flood Advisory | PSR | Maricopa, Pinal | 3 hr |
| Sep 2, 3:25 PM MST | Special Weather Statement | PSR | Maricopa | 65 min |
| Sep 2, 3:51 PM MST | Areal Flood Advisory | PSR | Maricopa, Pinal | 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.