Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 93, NWS Phoenix, AZ

July 25, 2021La Paz County, Yuma County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Jul 25, 2021, 5:10 PM MST for La Paz County, 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: Jul 25, 2021, 5:10 PM MST (00:10 UTC)
Expired: Jul 25, 2021, 9:15 PM 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), 81 km from the middle of the area, began a volume at 00:13 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, 7:19 PM MST	FLASH FLOOD	26 Sw Palm Canyon, AZ	US-95 CLOSED DUE TO FLOODING.

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, 0.2 hours before the alert went out and 213 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 602 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 735 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

095 
WGUS55 KPSR 260010
FFWPSR
AZC012-027-260415-
/O.NEW.KPSR.FF.W.0093.210726T0010Z-210726T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
510 PM MST Sun Jul 25 2021

The National Weather Service in Phoenix has issued a

* Flash Flood Warning for...
  North Central Yuma County in southwestern Arizona...
  Southern La Paz County in west central Arizona...

* Until 915 PM MST.

* At 510 PM MST, Doppler radar 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.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  mainly rural areas of North Central Yuma and Southern La Paz 
  Counties

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3321 11430 3333 11426 3335 11426 3327 11402
      3313 11387 3284 11436 3286 11438 3300 11436

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

MS

3 follow-up statements

621 
WGUS75 KPSR 260152
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
652 PM MST Sun Jul 25 2021

AZC012-027-260415-
/O.CON.KPSR.FF.W.0093.000000T0000Z-210726T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
La Paz AZ-Yuma AZ-
652 PM MST Sun Jul 25 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 PM MST THIS 
EVENING FOR NORTH CENTRAL YUMA AND SOUTHERN LA PAZ COUNTIES...

At 652 PM MST, Doppler radar indicated thunderstorms have produced 
between 1 and 3 inches of rain within the Warning area. Flash 
flooding is likely ongoing.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Radar.

IMPACT...Life threatening flash flooding of normally dry washes,
         highways, and rural roads.

Some locations that will experience flash flooding include...
  mainly rural areas of North Central Yuma and Southern La Paz 
  Counties

This includes the following highways...
	AZ Route 95 between mile markers 46 and 55.

This includes the following streams and drainages...
  Gravel Wash, Yaqui Wash, Indian Wash, Castle Dome Wash, Tyson 
  Wash, Big Eye Wash, Tenmile Wash and Angeles Wash.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3321 11430 3333 11426 3335 11426 3327 11402
      3313 11387 3284 11436 3286 11438 3300 11436

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

AJ

957 
WGUS75 KPSR 260313
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
813 PM MST Sun Jul 25 2021

AZC012-027-260415-
/O.CON.KPSR.FF.W.0093.000000T0000Z-210726T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
La Paz AZ-Yuma AZ-
813 PM MST Sun Jul 25 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 PM MST THIS 
EVENING FOR NORTH CENTRAL YUMA AND SOUTHERN LA PAZ COUNTIES...

At 813 PM MST, Local law enforcement reported US 95 was closed north 
of Yuma due to flooding. Thunderstorms produced 1 to 3 inches of 
heavy rain across the warned area. Flash flooding will continue.

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...
  mainly rural areas of North Central Yuma and Southern La Paz 
  Counties

This includes the following highways...
	AZ Route 95 between mile markers 46 and 55.

This includes the following streams and drainages...
  Gravel Wash, Yaqui Wash, Indian Wash, Castle Dome Wash, Tyson 
  Wash, Big Eye Wash, Tenmile Wash and Angeles Wash, Los.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3321 11430 3333 11426 3335 11426 3327 11402
      3313 11387 3284 11436 3286 11438 3300 11436

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

Iniguez

310 
WGUS75 KPSR 260412
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
912 PM MST Sun Jul 25 2021

AZC012-027-260422-
/O.EXP.KPSR.FF.W.0093.000000T0000Z-210726T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
La Paz AZ-Yuma AZ-
912 PM MST Sun Jul 25 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 915 PM MST THIS EVENING FOR 
NORTH CENTRAL YUMA AND SOUTHERN LA PAZ COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 3321 11430 3333 11426 3335 11426 3327 11402
      3313 11387 3284 11436 3286 11438 3300 11436

$$

Iniguez

The office that day

Everything else NWS Phoenix, AZ issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 25, 5:35 PM MST	Special Weather Statement	PSR		25 min
Jul 25, 6:04 PM MST	Special Weather Statement	PSR		41 min
Jul 25, 6:14 PM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz, Yuma	4 hr
Jul 25, 6:30 PM MST	Areal Flood Warning	PSR	Maricopa	5 hr
Jul 25, 6:58 PM MST	Flash Flood Warning Considerable damage threat	PSR	Yuma	3 hr
Jul 25, 7:20 PM MST	Areal Flood Warning	PSR	Maricopa	14 hr

Nearby

Flash Flood Warnings in Arizona, 2021 Every 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.