Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 59, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Jul 22, 2021, 8:52 PM MST for Maricopa County, Arizona. It was in force for 4 hr. 6 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 22, 2021, 8:52 PM MST (03:52 UTC)
- Expired
- Jul 23, 2021, 12:49 AM MST
- In force
- 4 hr
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Flood severity
- None
County Maricopa County, AZ
The radar
The Phoenix radar (KIWA), 49 km from the middle of the area, began a volume at 03:53 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 22, 9:10 PM MST | HEAVY RAIN 0.75 | 3 Wsw Fountain Hills, AZ | OBSERVED IN 30 MINUTES. ESTIMATED WINDS 50 MPH. |
| Jul 22, 9:24 PM MST | FLASH FLOOD | 1 Ese Paradise Valley, AZ | CURB TO CURB STREET FLOODING REPORTED. |
| Jul 22, 10:00 PM MST | FLASH FLOOD | 1 Se Scottsdale, AZ | TIM APPROX: MEDIA REPORTED A VEHICLE STUCK IN FLOWING WATER ON A SUBMERGED ROAD. DRIVER WAS RESCUED BY FIRE DEPARTMENT. |
| Jul 22, 10:14 PM MST | FLASH FLOOD | 4 S Deer Valley, AZ | VEHICLE TRAPPED IN FLOOD WATER AT I17/THUNDERBIRD. PORTIONS OF THE ROAD AND HIGHWAY WERE CLOSED DUE TO FLOODING. |
| Jul 22, 10:21 PM MST | FLASH FLOOD | 3 S Deer Valley, AZ | ADOT REPORTED HIGHWAY RAMPS AT I17/GREENWAY WERE COMPLETELY UNDERWATER. |
| Jul 22, 10:30 PM MST | FLASH FLOOD | 1 Ene Scottsdale, AZ | NUMEROUS REPORTS OF SWIFT RUNNING WATER INUNDATING MANY PLACES ALONG INDIAN BEND WASH. PICTURES SHOW WATER DEPTH AT LEAST 6 INCHES IN MANY SPOTS. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Phoenix, AZ (KPSR), launched 00:00Z, 3.9 hours before the alert went out and 23 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
- 1155 J/kg
- Mixed-layer CIN
- -46 J/kg
- Mixed-layer LCL
- 2803 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- -25 m²/s²
- 0-3 km storm-relative helicity
- -22 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
242
WGUS55 KPSR 230352
FFWPSR
AZC013-230800-
/O.NEW.KPSR.FF.W.0059.210723T0352Z-210723T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
852 PM MST Thu Jul 22 2021
The National Weather Service in Phoenix has issued a
* Flash Flood Warning for...
Maricopa County in south central Arizona...
* Until 100 AM MST.
* At 852 PM MST, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Phoenix, Mesa, Glendale, Scottsdale, Tempe, Paradise Valley,
Piestewa Peak Park, Camelback Mountain, Scottsdale Airport, Desert
Ridge Marketplace, North Mountain Park, Downtown Scottsdale,
Papago Park, Salt River Indian Community, Metro Center Mall, Sky
Harbor Airport, Deer Valley Airport, Tempe Marketplace, Arizona
State University and Arizona State Fairgrounds.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3360 11223 3372 11206 3373 11202 3378 11190
3376 11185 3350 11175 3338 11201
FLASH FLOOD...RADAR INDICATED
$$
AD5 follow-up statements
802
WGUS75 KPSR 230407
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
907 PM MST Thu Jul 22 2021
AZC013-230800-
/O.CON.KPSR.FF.W.0059.000000T0000Z-210723T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Maricopa AZ-
907 PM MST Thu Jul 22 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1 AM MST FRIDAY FOR
MARICOPA COUNTY...
At 907 PM MST, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
0.5 and 1 inch of rain has fallen. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar and automated gauges.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Phoenix, Mesa, Glendale, Scottsdale, Tempe, Paradise Valley,
Piestewa Peak Park, Camelback Mountain, Scottsdale Airport, Desert
Ridge Marketplace, North Mountain Park, Downtown Scottsdale,
Papago Park, Salt River Indian Community, Metro Center Mall, Sky
Harbor Airport, Deer Valley Airport, Tempe Marketplace, Arizona
State University and Arizona State Fairgrounds.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3360 11223 3372 11206 3373 11202 3378 11190
3376 11185 3350 11175 3338 11201
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
AD743
WGUS75 KPSR 230421
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
921 PM MST Thu Jul 22 2021
AZC013-230800-
/O.CON.KPSR.FF.W.0059.000000T0000Z-210723T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Maricopa AZ-
921 PM MST Thu Jul 22 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1 AM MST FRIDAY FOR
MARICOPA COUNTY...
At 921 PM MST, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
0.5 and 1 inch of rain has fallen. 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, Mesa, Glendale, Scottsdale, Tempe, Paradise Valley,
Piestewa Peak Park, Camelback Mountain, Scottsdale Airport, Desert
Ridge Marketplace, North Mountain Park, Downtown Scottsdale,
Papago Park, Salt River Indian Community, Metro Center Mall, Sky
Harbor Airport, Deer Valley Airport, Tempe Marketplace, Arizona
State University and Arizona State Fairgrounds.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3360 11223 3372 11206 3373 11202 3378 11190
3376 11185 3350 11175 3338 11201
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
AD805
WGUS75 KPSR 230431
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
931 PM MST Thu Jul 22 2021
AZC013-230800-
/O.CON.KPSR.FF.W.0059.000000T0000Z-210723T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Maricopa AZ-
931 PM MST Thu Jul 22 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1 AM MST FRIDAY FOR
MARICOPA COUNTY...
At 931 PM MST, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
0.5 and 1.5 inches of rain have fallen. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar and automated gauges.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Phoenix, Mesa, Scottsdale, Tempe, Paradise Valley, Scottsdale
Airport, Camelback Mountain, Downtown Scottsdale, Piestewa Peak
Park, Desert Ridge Marketplace, Salt River Indian Community,
Papago Park, North Mountain Park, Tempe Marketplace, Arizona State
University and Sky Harbor Airport.
Low water crossings and normally dry washes will contain storm
runoff. Locations like Reata Pass Wash, Indian Bend Wash, Old
Crosscut Canal at McDowell, and Granite Reef Wash are experiencing
flooding.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3357 11209 3360 11206 3362 11205 3367 11204
3371 11204 3373 11202 3378 11190 3376 11185
3350 11175 3338 11201 3349 11207
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
AD026
WGUS75 KPSR 230501
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
1001 PM MST Thu Jul 22 2021
AZC013-230800-
/O.CON.KPSR.FF.W.0059.000000T0000Z-210723T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Maricopa AZ-
1001 PM MST Thu Jul 22 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1 AM MST FRIDAY FOR
MARICOPA COUNTY...
At 1001 PM MST, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between 1
and 2 inches of rain have fallen. Flash flooding is occurring.
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, Mesa, Scottsdale, Tempe, Paradise Valley, Scottsdale
Airport, Camelback Mountain, Downtown Scottsdale, Piestewa Peak
Park, Desert Ridge Marketplace, Salt River Indian Community,
Papago Park, North Mountain Park, Tempe Marketplace, Arizona State
University and Sky Harbor Airport.
Maricopa County Flood Control gauge at Granite Reef Wash, near
Granite Reef Rd and McDowell, has reached flood stage. Multiple
county gauges along Indian Bend Wash also continue to rise.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3357 11209 3360 11206 3362 11205 3367 11204
3371 11204 3373 11202 3378 11190 3376 11185
3350 11175 3338 11201 3349 11207
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
AD978
WGUS75 KPSR 230749
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
1249 AM MST Fri Jul 23 2021
AZC013-230759-
/O.CAN.KPSR.FF.W.0059.000000T0000Z-210723T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Maricopa AZ-
1249 AM MST Fri Jul 23 2021
...FLASH FLOOD WARNING IS CANCELLED FOR MARICOPA COUNTY...
The heavy rain has ended and flood waters are receding. New flooding
is no longer expected to pose a threat. Please continue to heed
remaining road closures and avoid any areas that have lingering
flooding.
A Flash Flood Watch remains in effect until 1100 PM MST Saturday for
a portion of south central Arizona.
LAT...LON 3347 11193 3351 11194 3354 11193 3354 11188
3344 11189 3343 11191 3344 11192 3344 11193
$$
ADThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 5:42 PM MST | Special Weather Statement | PSR | 48 min | |
| Jul 22, 6:11 PM MST | Areal Flood Advisory | PSR | Maricopa | 39 min |
| Jul 22, 6:31 PM MST | Special Weather Statement | PSR | 59 min | |
| Jul 22, 6:50 PM MST | Flash Flood Warning | PSR | Maricopa | 6 hr |
| Jul 22, 7:19 PM MST | Areal Flood Advisory | PSR | Maricopa | 3 hr |
| Jul 22, 7:29 PM MST | Special Weather Statement | PSR | 61 min | |
| Jul 22, 7:40 PM MST | Severe Thunderstorm Warning | PSR | Pinal | 35 min |
| Jul 22, 7:46 PM MST | Flash Flood Warning | PSR | Maricopa | 5 hr |
| Jul 22, 7:48 PM MST | Dust Storm Advisory | PSR | Maricopa, Pinal | 27 min |
| Jul 22, 7:53 PM MST | Special Weather Statement | PSR | Pinal | 37 min |
| Jul 22, 7:55 PM MST | Areal Flood Advisory | PSR | Maricopa, Pinal | 5 hr |
| Jul 22, 8:05 PM MST | Special Weather Statement | PSR | Maricopa | 25 min |
| Jul 22, 8:06 PM MST | Flash Flood Warning | PSR | Pinal | 4 hr |
| Jul 22, 8:15 PM MST | Areal Flood Advisory | PSR | Maricopa | 3 hr |
| Jul 22, 8:19 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 26 min |
| Jul 22, 8:29 PM MST | Special Weather Statement | PSR | Pinal | 61 min |
| Jul 22, 8:39 PM MST | Special Weather Statement | PSR | Maricopa | 51 min |
| Jul 22, 8:56 PM MST | Areal Flood Advisory | PSR | Maricopa | 3 hr |
| Jul 22, 9:28 PM MST | Special Weather Statement | PSR | Maricopa | 47 min |
| Jul 22, 9:40 PM MST | Flash Flood Warning | PSR | Maricopa | 3 hr |
| Jul 22, 9:45 PM MST | Flash Flood Warning | PSR | Maricopa | 3 hr |
| Jul 22, 9:49 PM MST | Flash Flood Warning | PSR | Maricopa | 4 hr |
| Jul 22, 9:54 PM MST | Flash Flood Warning | PSR | Gila, Maricopa | 4 hr |
| Jul 22, 10:07 PM MST | Flash Flood Warning | PSR | Gila, Maricopa, Pinal | 4 hr |
| Jul 22, 10:16 PM MST | Areal Flood Advisory | PSR | Pinal | 3 hr |
| Jul 22, 10:57 PM MST | Flash Flood Warning | PSR | Maricopa | 113 min |
| Jul 22, 11:15 PM MST | Flash Flood Warning | PSR | Gila | 4 hr |
| Jul 22, 11:29 PM MST | Flash Flood Warning | PSR | Gila | 4 hr |
| Jul 22, 11:43 PM MST | Flash Flood Warning | PSR | Gila | 4 hr |
| Jul 23, 4:37 AM MST | Areal Flood Advisory | PSR | Maricopa | 3 hr |
| Jul 23, 8:37 AM MST | Areal Flood Warning | PSR | Gila | 4 days |
| Jul 23, 9:07 AM MST | Special Weather Statement | PSR | 38 min | |
| Jul 23, 9:30 AM MST | Special Weather Statement | PSR | 30 min | |
| Jul 23, 9:55 AM MST | Areal Flood Warning | PSR | Maricopa | 6 hr |
| Jul 23, 9:58 AM MST | Special Weather Statement | PSR | 32 min | |
| Jul 23, 10:31 AM MST | Special Weather Statement | PSR | 29 min | |
| Jul 23, 10:53 AM MST | Flash Flood Warning | PSR | Maricopa | 4 hr |
| Jul 23, 11:11 AM MST | Special Weather Statement | PSR | 34 min | |
| Jul 23, 11:46 AM MST | Special Weather Statement | PSR | 29 min | |
| Jul 23, 12:02 PM MST | Special Weather Statement | PSR | 28 min | |
| Jul 23, 12:09 PM MST | Flash Flood Warning | PSR | Maricopa | 6 hr |
| Jul 23, 12:30 PM MST | Special Weather Statement | PSR | 30 min | |
| Jul 23, 12:53 PM MST | Special Weather Statement | PSR | 37 min | |
| Jul 23, 1:01 PM MST | Special Weather Statement | PSR | 29 min | |
| Jul 23, 1:11 PM MST | Flash Flood Warning | PSR | Maricopa | 5 hr |
| Jul 23, 1:34 PM MST | Special Weather Statement | PSR | 26 min | |
| Jul 23, 2:25 PM MST | Flash Flood Warning | PSR | Maricopa | 4 hr |
| Jul 23, 3:20 PM MST | Areal Flood Warning | PSR | Maricopa | 9 hr |
| Jul 23, 4:00 PM MST | Areal Flood Warning | PSR | Maricopa | 8 hr |
| Jul 23, 4:02 PM MST | Areal Flood Warning | PSR | Maricopa | 8 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.