Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 107, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Jul 29, 2021, 3:00 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, 3:00 PM MST (22:00 UTC)
- Expired
- Jul 29, 2021, 7:00 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), 134 km from the middle of the area, began a volume at 22:03 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, 10.0 hours before the alert went out and 124 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.
633
WGUS55 KPSR 292200
FFWPSR
AZC013-300200-
/O.NEW.KPSR.FF.W.0107.210729T2200Z-210730T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
300 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 700 PM MST.
* At 300 PM MST, Doppler radar indicated thunderstorms producing
heavy rain in Midway basin. Between 1 and 1.5 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 with flow possible over parts of Highway 85.
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...
mainly rural areas of Maricopa County
This includes the following highways...
AZ Route 85 between mile markers 19 and 28.
This includes the following streams and drainages...
Tenmile Wash and Midway 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 3251 11285 3255 11289 3267 11295 3271 11291
3271 11286 3261 11269 3251 11270 3251 11282
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
SDB1 follow-up statement
797
WGUS75 KPSR 300011
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
511 PM MST Thu Jul 29 2021
AZC013-300200-
/O.CON.KPSR.FF.W.0107.000000T0000Z-210730T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Maricopa AZ-
511 PM MST Thu Jul 29 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 7 PM MST THIS EVENING
FOR MARICOPA COUNTY...
At 511 PM MST, Doppler radar indicated heavy rain fell in Midway
basin. Between 1 and 2 inches of rain have fallen. Flash flooding is
ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
mainly rural areas of Maricopa County
This includes the following highways...
AZ Route 85 between mile markers 19 and 28.
This includes the following streams and drainages...
Tenmile Wash and Midway Wash.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3251 11285 3255 11289 3267 11295 3271 11291
3271 11286 3261 11269 3251 11270 3251 11282
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
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, 1:57 PM MST | Flash Flood Warning | PSR | Maricopa | 4 hr |
| 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, 3:04 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.