Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 106, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Jul 29, 2021, 1:57 PM MST for Maricopa County, Arizona. It was in force for 4 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
- Jul 29, 2021, 1:57 PM MST (20:57 UTC)
- Expired
- Jul 29, 2021, 5:45 PM MST
- In force
- 4 hr
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Maricopa County, AZ
The radar
The Phoenix radar (KIWA), 105 km from the middle of the area, began a volume at 21:00 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, 9.0 hours before the alert went out and 91 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
- 371 J/kg
- Mixed-layer CIN
- -231 J/kg
- Mixed-layer LCL
- 2650 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- 11 m²/s²
- 0-3 km storm-relative helicity
- 5 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
556
WGUS55 KPSR 292057
FFWPSR
AZC013-300045-
/O.NEW.KPSR.FF.W.0106.210729T2057Z-210730T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
157 PM MST Thu Jul 29 2021
The National Weather Service in Phoenix has issued a
* Flash Flood Warning for...
Maricopa County in south central Arizona...
* Until 545 PM MST.
* At 157 PM MST, Doppler radar indicated thunderstorms producing
heavy rain in Sand Tank Wash, which goes through Gila Bend.
Between 1 and 2 inches of rain have fallen. Additional rainfall
amounts of 1 to 3 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 creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
Gila Bend and Gila Bend Auxiliary Field.
This includes the following highways...
AZ Route 238 between mile markers 1 and 2.
AZ Route 85 near mile marker 1...and
between mile markers 119 and 123...and
between mile markers 2 and 5.
AZ Interstate 8 between mile markers 116 and 124.
This includes the following streams and drainages...
Sauceda Wash, Quilotosa Wash, Bender Wash and Sand Tank Wash.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3285 11278 3298 11273 3298 11267 3287 11255
3272 11250 3270 11264
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
SDB2 follow-up statements
081
WGUS75 KPSR 292236
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
336 PM MST Thu Jul 29 2021
AZC013-300045-
/O.CON.KPSR.FF.W.0106.000000T0000Z-210730T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Maricopa AZ-
336 PM MST Thu Jul 29 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 545 PM MST THIS
AFTERNOON FOR MARICOPA COUNTY...
At 336 PM MST, Doppler radar indicated thunderstorms producing heavy
rain in Sand Tank Wash, which goes through Gila Bend. Between 1.5
and 2.5 inches of rain have fallen. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Gila Bend and Gila Bend Auxiliary Field.
This includes the following highways...
AZ Route 238 between mile markers 1 and 2.
AZ Route 85 near mile marker 1...and
between mile markers 119 and 123...and
between mile markers 2 and 5.
AZ Interstate 8 between mile markers 116 and 124.
This includes the following streams and drainages...
Sauceda Wash, Quilotosa Wash, Bender Wash and Sand Tank Wash.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3285 11278 3298 11273 3298 11267 3287 11255
3272 11250 3270 11264
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
SDB443
WGUS75 KPSR 300042
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
542 PM MST Thu Jul 29 2021
AZC013-300052-
/O.EXP.KPSR.FF.W.0106.000000T0000Z-210730T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Maricopa AZ-
542 PM MST Thu Jul 29 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 545 PM MST THIS AFTERNOON FOR
MARICOPA COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3285 11278 3298 11273 3298 11267 3287 11255
3272 11250 3270 11264
$$
SDBThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 12:56 PM MST | Special Weather Statement | PSR | Maricopa | 49 min |
| Jul 29, 1:14 PM MST | Special Weather Statement | PSR | 46 min | |
| Jul 29, 1:22 PM MST | Special Weather Statement | PSR | Yuma | 38 min |
| Jul 29, 1:24 PM MST | Special Weather Statement | PSR | Gila | 51 min |
| Jul 29, 1:26 PM MST | Flash Flood Watch | PSR | La Paz, Maricopa, Yuma | 40 hr |
| Jul 29, 1:33 PM MST | Special Weather Statement | PSR | Gila | 42 min |
| Jul 29, 1:35 PM MST | Areal Flood Advisory | PSR | Maricopa | 22 min |
| Jul 29, 1:36 PM MST | Flash Flood Warning | PSR | Gila | 6 hr |
| Jul 29, 1:42 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 48 min |
| Jul 29, 1:58 PM MST | Severe Thunderstorm Warning | PSR | Gila, Pinal | 47 min |
| Jul 29, 2:07 PM MST | Special Weather Statement | PSR | 53 min | |
| Jul 29, 2:11 PM MST | Special Weather Statement | PSR | Yuma | 49 min |
| Jul 29, 2:25 PM MST | Areal Flood Advisory | PSR | La Paz, Maricopa | 3 hr |
| Jul 29, 2:32 PM MST | Special Weather Statement | PSR | Yuma | 43 min |
| Jul 29, 2:35 PM MST | Areal Flood Advisory | PSR | Maricopa | 3 hr |
| Jul 29, 2:44 PM MST | Special Weather Statement | PSR | Gila | 46 min |
| Jul 29, 3:00 PM MST | Flash Flood Warning | PSR | Maricopa | 4 hr |
| Jul 29, 3:04 PM MST | Special Weather Statement | PSR | La Paz | 41 min |
| Jul 29, 3:17 PM MST | Flash Flood Warning | PSR | Gila | 3 hr |
| Jul 29, 3:19 PM MST | Special Weather Statement | PSR | Yuma | 41 min |
| Jul 29, 3:23 PM MST | Special Weather Statement | PSR | Gila | 52 min |
| Jul 29, 3:53 PM MST | Areal Flood Advisory | PSR | La Paz, Maricopa, Yuma | 3 hr |
| Jul 29, 3:56 PM MST | Flash Flood Warning | PSR | Gila | 4 hr |
| Jul 29, 3:59 PM MST | Special Weather Statement | PSR | 61 min | |
| Jul 29, 4:00 PM MST | Areal Flood Advisory | PSR | La Paz | 3 hr |
| Jul 29, 4:17 PM MST | Special Weather Statement | PSR | La Paz | 58 min |
| Jul 29, 4:18 PM MST | Areal Flood Advisory | PSR | La Paz | 3 hr |
| Jul 29, 4:40 PM MST | Areal Flood Advisory | PSR | La Paz | 3 hr |
| Jul 29, 4:42 PM MST | Areal Flood Advisory | PSR | Yuma | 3 hr |
| Jul 29, 4:48 PM MST | Special Weather Statement | PSR | 57 min |
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.