Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 163, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Aug 12, 2021, 7:16 PM MST for Yuma County, Arizona. It was in force for 4 hr. 1 report 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
- Aug 12, 2021, 7:16 PM MST (02:16 UTC)
- Expired
- Aug 12, 2021, 11:15 PM MST
- In force
- 4 hr
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Yuma County, AZ
The radar
The Yuma radar (KYUX), 74 km from the middle of the area, began a volume at 02:19 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 |
|---|---|---|---|
| Aug 12, 7:30 PM MST | HEAVY RAIN 1.25 | 1 N Tacna, AZ |
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, 2.3 hours before the alert went out and 198 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.
258
WGUS55 KPSR 130216
FFWPSR
AZC027-130615-
/O.NEW.KPSR.FF.W.0163.210813T0216Z-210813T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
716 PM MST Thu Aug 12 2021
The National Weather Service in Phoenix has issued a
* Flash Flood Warning for...
Central Yuma County in southwestern Arizona...
* Until 1115 PM MST.
* At 716 PM MST, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. 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.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of normally dry
washes, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
Tyson, Tacna and Roll.
This includes the following highways...
AZ Interstate 8 between mile markers 38 and 47.
This includes the following streams and drainages...
Big Eye Wash, Mohawk Wash, Mohawk Canal
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3299 11390 3283 11376 3261 11377 3258 11388
3272 11410 3282 11418 3296 11423
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
AJ3 follow-up statements
287
WGUS75 KPSR 130257
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
757 PM MST Thu Aug 12 2021
AZC027-130615-
/O.CON.KPSR.FF.W.0163.000000T0000Z-210813T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yuma AZ-
757 PM MST Thu Aug 12 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1115 PM MST THIS
EVENING FOR CENTRAL YUMA COUNTY...
At 757 PM MST, Doppler radar indicated thunderstorms have produced
between 1 and 2 inches of rain. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of normally dry washes,
highways, streets and underpasses.
Some locations that will experience flash flooding include...
Tyson, Tacna and Roll.
This includes the following highways...
AZ Interstate 8 between mile markers 38 and 47.
This includes the following streams and drainages...
Big Eye Wash, Mohawk Wash, Mohawk Canal, and small washes feeding
into the Gila River..
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles. It is especially difficult at night to
determine the depth of water.
&&
LAT...LON 3299 11390 3283 11376 3261 11377 3258 11388
3272 11410 3282 11418 3296 11423
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
AJ017
WGUS75 KPSR 130511
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
1011 PM MST Thu Aug 12 2021
AZC027-130615-
/O.CON.KPSR.FF.W.0163.000000T0000Z-210813T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yuma AZ-
1011 PM MST Thu Aug 12 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1115 PM MST THIS
EVENING FOR CENTRAL YUMA COUNTY...
At 1011 PM MST, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. 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.
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...
Tyson, Tacna and Roll.
This includes the following highways...
AZ Interstate 8 between mile markers 38 and 47.
This includes the following streams and drainages...
Big Eye Wash, Mohawk Wash, Gila River and Mohawk Canal.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3299 11390 3283 11376 3261 11377 3258 11388
3272 11410 3282 11418 3296 11423
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
Rogers364
WGUS75 KPSR 130611
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
1111 PM MST Thu Aug 12 2021
AZC027-130621-
/O.EXP.KPSR.FF.W.0163.000000T0000Z-210813T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yuma AZ-
1111 PM MST Thu Aug 12 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 1115 PM MST THIS EVENING FOR
CENTRAL YUMA COUNTY...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
LAT...LON 3299 11390 3283 11376 3261 11377 3258 11388
3272 11410 3282 11418 3296 11423
$$
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, 7:25 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 12, 8:48 PM MST | Flash Flood Warning | PSR | La Paz, Yuma | 4 hr |
| 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.