Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 54, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Jul 22, 2021, 12:28 AM 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 22, 2021, 12:28 AM MST (07:28 UTC)
- Expired
- Jul 22, 2021, 4:30 AM 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), 70 km from the middle of the area, began a volume at 07:30 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, 7.5 hours before the alert went out and 57 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
- 760 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 3156 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- -21 m²/s²
- 0-3 km storm-relative helicity
- 10 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
The text
As transmitted.
463
WGUS55 KPSR 220728
FFWPSR
AZC013-221130-
/O.NEW.KPSR.FF.W.0054.210722T0728Z-210722T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
1228 AM MST Thu Jul 22 2021
The National Weather Service in Phoenix has issued a
* Flash Flood Warning for...
The Sears burn scar in...
Maricopa County in south central Arizona...
* Until 430 AM MST.
* At 1228 AM MST, Doppler radar indicated thunderstorms producing
heavy rain over the Sears Burn Scar. Between 0.5 and 1.5 inches of
rain have fallen. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding in and around the Sears Burn
Scar.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of areas in and around
the Sears Burn Scar.
* Some locations that will experience flash flooding include...
Scottsdale and Camp Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3397 11171 3398 11166 3386 11167 3383 11171
3384 11176 3387 11184 3392 11185 3396 11182
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
183 follow-up statements
983
WGUS75 KPSR 220831
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
131 AM MST Thu Jul 22 2021
AZC013-221130-
/O.CON.KPSR.FF.W.0054.000000T0000Z-210722T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Maricopa AZ-
131 AM MST Thu Jul 22 2021
...FLASH FLOOD WARNING FOR THE SEARS BURN SCAR REMAINS IN EFFECT
UNTIL 430 AM MST EARLY THIS MORNING FOR MARICOPA COUNTY...
At 131 AM MST, Doppler radar indicated thunderstorms have produced
heavy rain over the Sears Burn Scar. Between 1 and 2 inches of rain
have fallen. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding in and around the Sears Burn Scar.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of areas in and around
the Sears Burn Scar.
Some locations that will experience flash flooding include...
Scottsdale and Camp Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move away from recently burned areas. Life-threatening flooding of
creeks, roads and normally dry arroyos is likely. The heavy rains
will likely trigger rockslides, mudslides and debris flows in steep
terrain, especially in and around these areas.
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3397 11171 3398 11166 3386 11167 3383 11171
3384 11176 3387 11184 3392 11185 3396 11182
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
18113
WGUS75 KPSR 221014
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
314 AM MST Thu Jul 22 2021
AZC013-221130-
/O.CON.KPSR.FF.W.0054.000000T0000Z-210722T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Maricopa AZ-
314 AM MST Thu Jul 22 2021
...FLASH FLOOD WARNING FOR THE SEARS BURN SCAR REMAINS IN EFFECT
UNTIL 430 AM MST EARLY THIS MORNING FOR MARICOPA COUNTY...
At 314 AM MST, Doppler radar indicated thunderstorms have produced
heavy rain over the Sears Burn Scar. 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 in and around the Sears Burn Scar.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of areas in and around
the Sears Burn Scar.
Some locations that will experience flash flooding include...
Scottsdale and Camp Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3397 11171 3398 11166 3386 11167 3383 11171
3384 11176 3387 11184 3392 11185 3396 11182
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
18904
WGUS75 KPSR 221125
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
425 AM MST Thu Jul 22 2021
AZC013-221135-
/O.EXP.KPSR.FF.W.0054.000000T0000Z-210722T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Maricopa AZ-
425 AM MST Thu Jul 22 2021
...FLASH FLOOD WARNING FOR THE SEARS BURN SCAR WILL EXPIRE AT 430 AM
MST EARLY THIS MORNING FOR MARICOPA COUNTY...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
LAT...LON 3397 11171 3398 11166 3386 11167 3383 11171
3384 11176 3387 11184 3392 11185 3396 11182
$$
18The office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 5:37 PM MST | Special Weather Statement | PSR | Yuma | 38 min |
| Jul 21, 5:41 PM MST | Special Weather Statement | PSR | 49 min | |
| Jul 21, 6:18 PM MST | Severe Thunderstorm Warning | PSR | La Paz, Yuma | 42 min |
| Jul 21, 6:20 PM MST | Special Weather Statement | PSR | Gila | 40 min |
| Jul 21, 6:47 PM MST | Special Weather Statement | PSR | 43 min | |
| Jul 21, 6:59 PM MST | Special Weather Statement | PSR | Yuma | 46 min |
| Jul 21, 7:06 PM MST | Areal Flood Advisory | PSR | Gila | 3 hr |
| Jul 21, 7:10 PM MST | Special Weather Statement | PSR | La Paz | 50 min |
| Jul 21, 7:17 PM MST | Areal Flood Advisory | PSR | Yuma | 44 min |
| Jul 21, 7:40 PM MST | Dust Storm Warning | PSR | Yuma | 35 min |
| Jul 21, 8:01 PM MST | Flash Flood Warning | PSR | Yuma | 4 hr |
| Jul 21, 8:13 PM MST | Dust Storm Advisory | PSR | Yuma | 47 min |
| Jul 21, 9:06 PM MST | Dust Storm Advisory | PSR | Maricopa, Pinal | 39 min |
| Jul 21, 10:06 PM MST | Dust Storm Advisory | PSR | Maricopa, Pinal | 39 min |
| Jul 21, 10:11 PM MST | Special Weather Statement | PSR | Pinal | 49 min |
| Jul 21, 10:23 PM MST | Special Weather Statement | PSR | Maricopa | 37 min |
| Jul 21, 10:25 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 16 min |
| Jul 21, 10:39 PM MST | Special Weather Statement | PSR | 36 min | |
| Jul 21, 10:51 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 24 min |
| Jul 21, 11:12 PM MST | Special Weather Statement | PSR | 48 min | |
| Jul 21, 11:15 PM MST | Special Weather Statement | PSR | Pinal | 45 min |
| Jul 22, 12:32 AM MST | Areal Flood Advisory | PSR | Maricopa | 118 min |
| Jul 22, 3:06 PM MST | Special Weather Statement | PSR | 54 min | |
| Jul 22, 3:43 PM MST | Special Weather Statement | PSR | Maricopa | 47 min |
| Jul 22, 3:58 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 33 min |
| Jul 22, 4:30 PM MST | Dust Storm Advisory | PSR | Yuma | 41 min |
| Jul 22, 4:53 PM MST | Areal Flood Advisory | PSR | Maricopa | 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.