Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 79, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Jul 25, 2021, 10:16 AM MST for Maricopa County, Arizona. It was in force for 4 hr. 4 reports 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
- Jul 25, 2021, 10:16 AM MST (17:16 UTC)
- Expired
- Jul 25, 2021, 2:15 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), 56 km from the middle of the area, began a volume at 17:17 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 |
|---|---|---|---|
| Jul 25, 10:55 AM MST | FLASH FLOOD | 2 Nne Sun City, AZ | MULTIPLE WATER RESCUES REPORTED IN SUN CITY, INCLUDING 98TH AVE AND GRANADA, 107TH AVE AND MOUNTAIN VIEW, AND 99TH AVE AND BURNS. |
| Jul 25, 11:06 AM MST | FLASH FLOOD | 1 Ne Sun City, AZ | FLOOD CONTROL CHANNEL ALONG CENTER OF 99TH AVE WAS OVERFLOWING ONTO THE STREET. MCSO DEPUTY STOPPING SOUTH-BOUND TRAFFIC AT DESERT ROCK DRIVE (SOUTH OF BELL RD.) DUE TO DEPTH OF WATER JUST SOUTH OF THERE. |
| Jul 25, 11:37 AM MST | FLASH FLOOD | 2 Ene Tolleson, AZ | SEVERAL LANES ON INTERSTATE 10 NEAR 75TH AVE AND 91ST AVE ARE FLOODED AND IMPASSABLE. |
| Jul 25, 11:57 AM MST | FLASH FLOOD | 3 N Sun City, AZ | WATER RESCUE AT 107TH AVE AND UNION HILLS. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Tuscon, AZ (KTUS), launched 12:00Z, 5.3 hours before the alert went out and 191 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
- 151 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 521 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- 95 m²/s²
- 0-3 km storm-relative helicity
- 103 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
767
WGUS55 KPSR 251716
FFWPSR
AZC013-252115-
/O.NEW.KPSR.FF.W.0079.210725T1716Z-210725T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
1016 AM MST Sun Jul 25 2021
The National Weather Service in Phoenix has issued a
* Flash Flood Warning for...
Maricopa County in south central Arizona...
* Until 215 PM MST.
* At 1016 AM MST, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
0.5 and 1.5 inches of rain have fallen. Additional rainfall
amounts of 1 to 2 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 and automated gauges.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
Phoenix, Glendale, Peoria, Surprise, Avondale, Goodyear, El
Mirage, Tolleson, Youngtown, Laveen, Sun City, Sun City West,
Glendale Sports Complex, Downtown Glendale, Camelback Ranch,
Downtown Peoria, Phoenix International Raceway, Arrowhead Mall,
South Phoenix and Komatke.
This includes the following highways...
AZ Interstate 10 between mile markers 132 and 141.
AZ Route 101 between mile markers 10 and 18.
US Highway 60 between mile markers 141 and 150.
This includes the following streams and drainages...
Agua Fria River, Corgett Wash, Cave Creek, Beardsley Canal, Salt
River, Gila River, New River, Skunk Creek and North Canyon Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 3329 11220 3331 11236 3336 11232 3359 11230
3366 11238 3369 11236 3372 11221 3364 11216
3351 11215 3343 11212 3337 11204 3329 11219
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
SDB1 follow-up statement
285
WGUS75 KPSR 251800
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
1100 AM MST Sun Jul 25 2021
AZC013-252115-
/O.CON.KPSR.FF.W.0079.000000T0000Z-210725T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Maricopa AZ-
1100 AM MST Sun Jul 25 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 215 PM MST THIS
AFTERNOON FOR MARICOPA COUNTY...
At 1100 AM MST, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between 2
and 3.5 inches of rain have fallen. The expected rainfall rate is 1
to 2 inches in 1 hour. Additional rainfall amounts of 1 to 3 inches
are possible in the warned area. Flash flooding is already
occurring. Multiple water rescues have been reported in Sun City
area. Standing water has also been observed on I-10 in Tolleson.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar and automated gauges.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Phoenix, Glendale, Peoria, Surprise, Avondale, Goodyear, El
Mirage, Tolleson, Youngtown, Laveen, Sun City, Sun City West,
Glendale Sports Complex, Downtown Glendale, Camelback Ranch,
Downtown Peoria, Phoenix International Raceway, Arrowhead Mall,
South Phoenix and Komatke.
This includes the following highways...
AZ Interstate 10 between mile markers 132 and 141.
AZ Route 101 between mile markers 10 and 18.
US Highway 60 between mile markers 141 and 150.
This includes the following streams and drainages...
Agua Fria River, Corgett Wash, Cave Creek, Beardsley Canal, Salt
River, Gila River, New River, Skunk Creek and North Canyon Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 3329 11220 3331 11236 3336 11232 3359 11230
3366 11238 3369 11236 3372 11221 3364 11216
3351 11215 3343 11212 3337 11204 3329 11219
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR
$$
SDBThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 24, 10:57 PM MST | Areal Flood Advisory | PSR | Maricopa | 5 hr |
| Jul 25, 4:45 AM MST | Areal Flood Advisory | PSR | Maricopa | 3 hr |
| Jul 25, 6:27 AM MST | Areal Flood Advisory | PSR | Pinal | 3 hr |
| Jul 25, 7:14 AM MST | Areal Flood Advisory | PSR | Maricopa | 3 hr |
| Jul 25, 7:38 AM MST | Areal Flood Advisory | PSR | Maricopa | 3 hr |
| Jul 25, 7:57 AM MST | Areal Flood Advisory | PSR | Pinal | 3 hr |
| Jul 25, 8:01 AM MST | Areal Flood Advisory | PSR | Maricopa | 3 hr |
| Jul 25, 8:45 AM MST | Flash Flood Warning | PSR | Maricopa, Pinal | 4 hr |
| Jul 25, 8:51 AM MST | Flash Flood Warning | PSR | Maricopa | 6 hr |
| Jul 25, 9:00 AM MST | Flash Flood Warning | PSR | Pinal | 4 hr |
| Jul 25, 9:39 AM MST | Areal Flood Advisory | PSR | Maricopa | 17 min |
| Jul 25, 9:47 AM MST | Areal Flood Advisory | PSR | Maricopa, Pinal | 3 hr |
| Jul 25, 9:56 AM MST | Flash Flood Warning | PSR | Maricopa | 8 hr |
| Jul 25, 10:08 AM MST | Flash Flood Warning | PSR | Maricopa, Pinal | 4 hr |
| Jul 25, 10:41 AM MST | Flash Flood Warning | PSR | Maricopa | 4 hr |
| Jul 25, 12:11 PM MST | Flash Flood Warning | PSR | Gila | 4 hr |
| Jul 25, 12:35 PM MST | Flash Flood Warning | PSR | Maricopa | 4 hr |
| Jul 25, 12:54 PM MST | Flash Flood Warning | PSR | Maricopa | 4 hr |
| Jul 25, 2:10 PM MST | Flash Flood Warning | PSR | Gila, Maricopa | 4 hr |
| Jul 25, 2:14 PM MST | Flash Flood Warning | PSR | Maricopa | 3 hr |
| Jul 25, 2:18 PM MST | Flash Flood Warning | PSR | Maricopa | 3 hr |
| Jul 25, 3:29 PM MST | Special Weather Statement | PSR | La Paz | 31 min |
| Jul 25, 4:02 PM MST | Flash Flood Warning | PSR | La Paz | 4 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.