Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 193, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Aug 16, 2021, 11:07 PM MST for Maricopa County, Pinal County, Arizona. It was in force for 7 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
- Aug 16, 2021, 11:07 PM MST (06:07 UTC)
- Expired
- Aug 17, 2021, 5:56 AM MST
- In force
- 7 hr
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Maricopa County, AZ, Pinal County, AZ
The radar
The Phoenix radar (KIWA), 19 km from the middle of the area, began a volume at 06:11 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, 6.1 hours before the alert went out and 39 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
- 2667 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 1942 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 24 m²/s²
- 0-3 km storm-relative helicity
- 44 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
782
WGUS55 KPSR 170607
FFWPSR
AZC013-021-171400-
/O.NEW.KPSR.FF.W.0193.210817T0607Z-210817T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
1107 PM MST Mon Aug 16 2021
The National Weather Service in Phoenix has issued a
* Flash Flood Warning for...
Maricopa County in south central Arizona...
Pinal County in southeastern Arizona...
* Until 700 AM MST Tuesday.
* At 1107 PM MST, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.5 and 1 inch of rain
has fallen. Additional rainfall amounts of 0.5 to 1 inch 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...
Mesa, Apache Junction, Goldfield, Lost Dutchman State Park,
Superstition Mountains and Gold Camp.
This includes the following highways...
AZ Route 202 between mile markers 28 and 32.
US Highway 60 between mile markers 189 and 198.
This includes the following streams and drainages...
Salt River, First Water Creek and Bulldog Wash.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Action Stage has been reached. Flowing water anticipated to impact
low water crossings along Weekes Wash. Expect one or more low water
crossings to be impassible.
&&
LAT...LON 3339 11159 3336 11164 3337 11167 3339 11168
3342 11166 3344 11161 3346 11159 3348 11156
3350 11152 3351 11148 3349 11147 3348 11148
3347 11147 3344 11144 3340 11147 3336 11147
3336 11153 3337 11157
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
Hirsch1 follow-up statement
468
WGUS75 KPSR 171256
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
556 AM MST Tue Aug 17 2021
AZC013-021-171306-
/O.CAN.KPSR.FF.W.0193.000000T0000Z-210817T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Maricopa AZ-Pinal AZ-
556 AM MST Tue Aug 17 2021
...FLASH FLOOD WARNING IS CANCELLED FOR MARICOPA AND PINAL
COUNTIES...
Flood waters have receded near Weekes Wash. The heavy rain has
ended. Flooding is no longer expected to pose a threat. Please
continue to heed remaining road closures.
LAT...LON 3339 11159 3336 11164 3337 11167 3339 11168
3342 11166 3344 11161 3346 11159 3348 11156
3350 11152 3351 11148 3349 11147 3348 11148
3347 11147 3344 11144 3340 11147 3336 11147
3336 11153 3337 11157
$$
HirschThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 5:15 PM MST | Special Weather Statement | PSR | Gila | 45 min |
| Aug 16, 5:46 PM MST | Special Weather Statement | PSR | 44 min | |
| Aug 16, 6:07 PM MST | Special Weather Statement | PSR | Gila | 38 min |
| Aug 16, 6:14 PM MST | Severe Thunderstorm Warning | PSR | Gila | 46 min |
| Aug 16, 6:37 PM MST | Special Weather Statement | PSR | Pinal | 53 min |
| Aug 16, 6:55 PM MST | Flash Flood Warning | PSR | Gila | 6 hr |
| Aug 16, 8:24 PM MST | Special Weather Statement | PSR | 51 min | |
| Aug 16, 8:41 PM MST | Flash Flood Warning | PSR | Maricopa | 5 hr |
| Aug 16, 8:53 PM MST | Special Weather Statement | PSR | Gila | 52 min |
| Aug 16, 9:08 PM MST | Special Weather Statement | PSR | Gila | 52 min |
| Aug 16, 9:22 PM MST | Severe Thunderstorm Warning | PSR | Gila, Maricopa, Pinal | 38 min |
| Aug 16, 9:41 PM MST | Severe Thunderstorm Warning | PSR | Gila, Maricopa, Pinal | 49 min |
| Aug 16, 9:49 PM MST | Severe Thunderstorm Warning | PSR | Gila, Maricopa | 41 min |
| Aug 16, 10:01 PM MST | Flash Flood Warning | PSR | Gila | 4 hr |
| Aug 16, 10:01 PM MST | Special Weather Statement | PSR | 44 min | |
| Aug 16, 10:05 PM MST | Flash Flood Warning | PSR | Gila | 4 hr |
| Aug 16, 10:14 PM MST | Severe Thunderstorm Warning | PSR | Gila, Maricopa, Pinal | 46 min |
| Aug 16, 10:22 PM MST | Flash Flood Warning | PSR | Gila | 10 hr |
| Aug 16, 10:28 PM MST | Flash Flood Warning | PSR | Gila, Maricopa, Pinal | 10 hr |
| Aug 16, 10:36 PM MST | Flash Flood Warning | PSR | Gila, Maricopa | 10 hr |
| Aug 16, 10:38 PM MST | Dust Storm Advisory | PSR | Maricopa, Pinal | 67 min |
| Aug 16, 10:48 PM MST | Flash Flood Warning | PSR | Maricopa, Pinal | 9 hr |
| Aug 16, 10:54 PM MST | Severe Thunderstorm Warning | PSR | Maricopa, Pinal | 51 min |
| Aug 16, 10:58 PM MST | Flash Flood Warning | PSR | Maricopa | 7 hr |
| Aug 16, 11:04 PM MST | Dust Storm Warning | PSR | Maricopa, Pinal | 56 min |
| Aug 16, 11:16 PM MST | Flash Flood Warning | PSR | Maricopa | 7 hr |
| Aug 16, 11:26 PM MST | Flash Flood Warning | PSR | Maricopa, Pinal | 8 hr |
| Aug 16, 11:31 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 44 min |
| Aug 16, 11:41 PM MST | Severe Thunderstorm Warning | PSR | Maricopa, Pinal | 49 min |
| Aug 16, 11:47 PM MST | Dust Storm Warning | PSR | Maricopa | 58 min |
| Aug 16, 11:50 PM MST | Special Weather Statement | PSR | 40 min | |
| Aug 16, 11:52 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 38 min |
| Aug 16, 11:56 PM MST | Flash Flood Warning | PSR | Pinal | 7 hr |
| Aug 16, 11:59 PM MST | Flash Flood Warning | PSR | Maricopa | 6 hr |
| Aug 17, 12:01 AM MST | Dust Storm Warning | PSR | Maricopa, Pinal | 59 min |
| Aug 17, 12:09 AM MST | Flash Flood Warning | PSR | Maricopa, Pinal | 8 hr |
| Aug 17, 12:32 AM MST | Special Weather Statement | PSR | 43 min | |
| Aug 17, 12:36 AM MST | Special Weather Statement | PSR | Maricopa | 24 min |
| Aug 17, 4:05 AM MST | Areal Flood Advisory | PSR | Maricopa | 4 hr |
| Aug 17, 4:26 AM MST | Flash Flood Warning | PSR | Maricopa | 6 hr |
| Aug 17, 5:29 AM MST | Special Weather Statement | PSR | Maricopa | 76 min |
| Aug 17, 5:35 AM MST | Flash Flood Warning | PSR | Maricopa | 6 hr |
| Aug 17, 6:26 AM MST | Flash Flood Warning | PSR | Gila, Pinal | 5 hr |
| Aug 17, 8:42 AM MST | Areal Flood Warning | PSR | Gila | 5 days |
| Aug 17, 4:46 PM MST | Special Weather Statement | PSR | 44 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.