Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 164, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Aug 12, 2021, 8:48 PM MST for La Paz County, Yuma 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
- Aug 12, 2021, 8:48 PM MST (03:48 UTC)
- Expired
- Aug 13, 2021, 12:45 AM MST
- In force
- 4 hr
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties La Paz County, AZ, Yuma County, AZ
The radar
The Yuma radar (KYUX), 149 km from the middle of the area, began a volume at 03:49 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, 3.8 hours before the alert went out and 197 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
- -4 J/kg
- Mixed-layer LCL
- 1919 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- 13 m²/s²
- 0-3 km storm-relative helicity
- 9 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
680
WGUS55 KPSR 130348
FFWPSR
AZC012-027-130745-
/O.NEW.KPSR.FF.W.0164.210813T0348Z-210813T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
848 PM MST Thu Aug 12 2021
The National Weather Service in Phoenix has issued a
* Flash Flood Warning for...
North Central Yuma County in southwestern Arizona...
Central La Paz County in west central Arizona...
* Until 1245 AM MST.
* At 848 PM MST, La Paz County Sheriffs Office reported Highway 72
had flooding causing the road to be impassable. Between 1 and 1.5
inches of rain fell earlier. Flash flooding is also expected to
affect other areas including Highway 95.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding.
SOURCE...Law enforcement reported.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
Quartzsite, Brenda, Kofa Wildlife Refuge, Bouse, Vicksburg
Junction and Vicksburg.
This includes the following highways...
AZ Interstate 10 between mile markers 17 and 26.
AZ Route 72 between mile markers 16 and 25.
AZ Route 95 between mile markers 100 and 112.
US Highway 60 between mile markers 31 and 40.
This includes the following streams and drainages...
Bouse Wash, Cunningham Wash, Tyson Wash, Alamo Wash, Apache Wash,
Red Raven Wash, Plomosa Wash, Poormans Wash, and Cholla Wash.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3339 11429 3379 11424 3380 11397 3397 11418
3402 11416 3402 11402 3372 11368 3355 11373
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
AJ2 follow-up statements
361
WGUS75 KPSR 130511 RRA
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
1011 PM MST Thu Aug 12 2021
AZC012-027-130745-
/O.CON.KPSR.FF.W.0164.000000T0000Z-210813T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
La Paz AZ-Yuma AZ-
1011 PM MST Thu Aug 12 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1245 AM MST FRIDAY
FOR NORTH CENTRAL YUMA AND CENTRAL LA PAZ COUNTIES...
At 1011 PM MST, local law enforcement reported thunderstorms
produced heavy rain across the warned area. Between 1 and 1.5 inches
of rain have fallen. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Law enforcement reported.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Quartzsite, Brenda, Kofa Wildlife Refuge, Bouse, Vicksburg
Junction and Vicksburg.
This includes the following highways...
AZ Interstate 10 between mile markers 17 and 26.
AZ Route 72 between mile markers 16 and 25.
AZ Route 95 between mile markers 100 and 103...and
between mile markers 104 and 112.
US Highway 60 between mile markers 31 and 40.
This includes the following streams and drainages...
Alamo Wash, Apache Wash, Red Raven Wash, Calcite Wash, Cave Creek,
Scaddan Wash, Plomosa Wash, Cunningham Wash, Tyson Wash, French
Creek, Bouse Wash, Poormans Wash, Cholla Wash, La and Smith Wash.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3339 11429 3379 11424 3380 11397 3397 11418
3402 11416 3402 11402 3372 11368 3355 11373
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
Rogers033
WGUS75 KPSR 130742
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
1242 AM MST Fri Aug 13 2021
AZC012-027-130752-
/O.EXP.KPSR.FF.W.0164.000000T0000Z-210813T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
La Paz AZ-Yuma AZ-
1242 AM MST Fri Aug 13 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 1245 AM MST EARLY THIS MORNING
FOR NORTH CENTRAL YUMA AND CENTRAL LA PAZ COUNTIES...
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 3339 11429 3379 11424 3380 11397 3397 11418
3402 11416 3402 11402 3372 11368 3355 11373
$$
CKThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 5:16 PM MST | Special Weather Statement | PSR | Yuma | 44 min |
| Aug 12, 5:17 PM MST | Special Weather Statement | PSR | Yuma | 43 min |
| Aug 12, 5:53 PM MST | Areal Flood Advisory | PSR | Yuma | 3 hr |
| Aug 12, 6:28 PM MST | Special Weather Statement | PSR | La Paz | 47 min |
| Aug 12, 6:30 PM MST | Special Weather Statement | PSR | Yuma | 45 min |
| Aug 12, 6:42 PM MST | Areal Flood Advisory | PSR | La Paz | 3 hr |
| Aug 12, 6:47 PM MST | Areal Flood Advisory | PSR | Maricopa, Yuma | 3 hr |
| Aug 12, 6:50 PM MST | Severe Thunderstorm Warning | PSR | Yuma | 40 min |
| Aug 12, 6:52 PM MST | Severe Thunderstorm Warning | PSR | La Paz | 38 min |
| Aug 12, 7:16 PM MST | Flash Flood Warning | PSR | Yuma | 4 hr |
| Aug 12, 7:25 PM MST | Severe Thunderstorm Warning | PSR | La Paz | 50 min |
| Aug 12, 7:42 PM MST | Areal Flood Advisory | PSR | La Paz, Yuma | 3 hr |
| Aug 12, 7:56 PM MST | Special Weather Statement | PSR | La Paz | 49 min |
| Aug 12, 8:05 PM MST | Dust Storm Advisory | PSR | La Paz, Yuma | 55 min |
| Aug 13, 2:50 PM MST | Special Weather Statement | PSR | Gila | 40 min |
| Aug 13, 3:30 PM MST | Severe Thunderstorm Warning | PSR | Gila | 45 min |
| Aug 13, 3:36 PM MST | Flash Flood Warning | PSR | Gila | 4 hr |
| Aug 13, 4:12 PM MST | Flash Flood Warning | PSR | Gila | 4 hr |
| Aug 13, 4:14 PM MST | Special Weather Statement | PSR | Gila | 46 min |
| Aug 13, 4:34 PM MST | Severe Thunderstorm Warning | PSR | Gila, Maricopa, Pinal | 41 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.