Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 52, NWS Phoenix, AZ

August 22, 2012La Paz County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Aug 22, 2012, 5:47 PM MST for La Paz County, Arizona. It was in force for 3 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 22, 2012, 5:47 PM MST (00:47 UTC)
Expired: Aug 22, 2012, 8:45 PM MST
In force: 3 hr
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Flood severity: None

County La Paz County, AZ

The radar

The Yuma radar (KYUX), 177 km from the middle of the area, began a volume at 00:50 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

Yuma Intl Airpor, AZ (KYUM), launched 00:00Z, 0.8 hours before the alert went out and 159 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: 950 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 2077 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

571 
WGUS55 KPSR 230047
FFWPSR
AZC012-230345-
/O.NEW.KPSR.FF.W.0052.120823T0047Z-120823T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
547 PM MST WED AUG 22 2012

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH CENTRAL LA PAZ COUNTY IN WEST CENTRAL ARIZONA...

* UNTIL 845 PM MST

* AT 530 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED   
VERY HEAVY RAIN THAT WILL CAUSE FLASH FLOODING ALONG STATE ROAD 72 
AND IN THE AREA OF THE BOUSE WASH. THE HEAVIEST RAIN IS EXPECTED 
WEST OF BOUSE...WHERE UP TO AN ADDITIONAL TWO INCHES MAY FALL. IF 
YOU ENCOUNTER WATER OF UNKNOWN DEPTH...TURN AROUND DONT DROWN.

LAT...LON 3406 11417 3408 11403 3412 11391 3406 11390
      3400 11398 3398 11402 3392 11407 3389 11413
      3392 11423

$$

HIRSCH

1 follow-up statement

303 
WGUS75 KPSR 230158
FFSPSR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
658 PM MST WED AUG 22 2012

AZC012-230345-
/O.CON.KPSR.FF.W.0052.000000T0000Z-120823T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LA PAZ AZ-
658 PM MST WED AUG 22 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM MST FOR NORTH
CENTRAL LA PAZ COUNTY...

HEAVY RAIN HAS MOVED OUT OF THE AREA...HOWEVER MODERATE TO HEAVY 
RAIN IS EXPECTED TO REDEVELOP LATER THIS EVENING NEAR THE BOUSE 
WASH. THOSE NEAR THE WASH AND ALONG STATE ROUTE 72 SHOULD BE ON 
ALERT FOR FLASH FLOODING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOST FLOOD DEATHS OCCUR IN MOTORIZED VEHICLES. WHEN ENCOUNTERING
FLOODED ROADS...MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

TO REPORT FLOODING...PLEASE RELAY YOUR REPORT TO LOCAL LAW
ENFORCEMENT WHEN YOU CAN DO SO SAFELY.

&&

LAT...LON 3406 11417 3408 11403 3412 11391 3406 11390
      3400 11398 3398 11402 3392 11407 3389 11413
      3392 11423

$$

HIRSCH

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 22, 6:21 PM MST	Areal Flood Advisory	PSR	La Paz	114 min
Aug 22, 6:42 PM MST	Flash Flood Warning	PSR	La Paz	70 min
Aug 22, 6:44 PM MST	Special Weather Statement	PSR		46 min
Aug 22, 7:16 PM MST	Special Weather Statement	PSR		44 min
Aug 22, 8:53 PM MST	Areal Flood Advisory	PSR	La Paz, Yuma	112 min
Aug 22, 9:08 PM MST	Areal Flood Advisory	PSR	La Paz	112 min
Aug 22, 11:01 PM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Aug 23, 1:05 AM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Aug 23, 1:46 AM MST	Areal Flood Advisory	PSR	Maricopa	119 min
Aug 23, 2:03 AM MST	Special Weather Statement	PSR		27 min
Aug 23, 2:08 AM MST	Special Weather Statement	PSR		37 min
Aug 23, 2:22 AM MST	Areal Flood Advisory	PSR	Maricopa	113 min
Aug 23, 5:29 AM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Aug 23, 9:37 AM MST	River Flood Advisory	PSR	Yuma	5 hr

Nearby

Flash Flood Warnings in Arizona, 2012 Every flash flood warning in 2012

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.