Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 32, NWS Phoenix, AZ

August 16, 2012La Paz County, Maricopa County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Aug 16, 2012, 7:08 PM MST for La Paz County, Maricopa County, Arizona. It was in force for 2 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, 2012, 7:08 PM MST (02:08 UTC)
Expired: Aug 16, 2012, 9:28 PM MST
In force: 2 hr
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Flood severity: None

Counties La Paz County, AZ, Maricopa County, AZ

The nearest sounding before it

Phoenix, AZ (KPSR), launched 00:00Z, 2.1 hours before the alert went out and 138 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: 934 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 1678 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

459 
WGUS55 KPSR 170208
FFWPSR
AZC012-013-170500-
/O.NEW.KPSR.FF.W.0032.120817T0208Z-120817T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
708 PM MST THU AUG 16 2012

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EXTREME WEST CENTRAL MARICOPA COUNTY IN SOUTH CENTRAL ARIZONA...
  EAST CENTRAL LA PAZ COUNTY IN WEST CENTRAL ARIZONA...

* UNTIL 1000 PM MST

* AT 700 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED
  VERY HEAVY RAIN THAT WILL CAUSE FLASH FLOODING.

* THE STORMS PRODUCING VERY HEAVY RAIN THAT WILL CAUSE FLASH FLOODING
  WILL CAUSE FLOODING ALONG TIGER AND CENTENNIAL WASH AND ALONG      
  COUNTY ROADS IN THE WARNED AREA. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT PEOPLE ALONG THE BANKS OF WASHES AND
CREEKS SHOULD MOVE TO HIGHER GROUND IMMEDIATELY. NORMALLY DRY WASHES
AND STREAMS WILL SUDDENLY HAVE RUNNING WATER AND MAKE UNBRIDGED
CROSSINGS IMPASSABLE. STREETS...UNDERPASSES...AND LOW SPOTS WILL
BECOME INUNDATED MAKING DRIVING HAZARDOUS IN THE WARNED AREA.

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

&&

LAT...LON 3367 11353 3361 11329 3343 11332 3347 11358

$$

MCLANE

2 follow-up statements

365 
WGUS75 KPSR 170318
FFSPSR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
818 PM MST THU AUG 16 2012

AZC012-013-170500-
/O.CON.KPSR.FF.W.0032.000000T0000Z-120817T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LA PAZ AZ-MARICOPA AZ-
818 PM MST THU AUG 16 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1000 PM MST FOR
EXTREME WEST CENTRAL MARICOPA AND EAST CENTRAL LA PAZ COUNTIES...

AT 809 PM MST...RAIN WAS CONTINUING TO FALL OVER THE WARNED AREA. 
ESTIMATED RAINFALL AMOUNTS OF TWO TO THREE INCHES HAD FALLEN OVER 
PORTIONS OF EAST CENTRAL LA PAZ AND EXTREME WEST CENTRAL MARICOPA 
COUNTIES. RAINFALL INTENSITIES OF THIS MAGNITUDE OCCUR VERY 
INFREQUENTLY. EXCESSIVE RUNOFF WILL LIKELY CAUSE FLASH FLOODING. 

TIGER WASH AND CENTENNIAL WASH WILL LIKELY SEE SOME FLOODING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT PEOPLE ALONG THE BANKS OF WASHES AND
CREEKS SHOULD MOVE TO HIGHER GROUND IMMEDIATELY. NORMALLY DRY WASHES
AND STREAMS WILL SUDDENLY HAVE RUNNING WATER AND MAKE UNBRIDGED
CROSSINGS IMPASSABLE. STREETS...UNDERPASSES...AND LOW SPOTS WILL
BECOME INUNDATED MAKING DRIVING HAZARDOUS IN THE WARNED AREA.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF NORMALLY
DRY WASHES AND CREEKS...ROADS...AND LOW LYING SPOTS. UNBRIDGED
CROSSINGS WILL BE ESPECIALLY DANGEROUS.

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

&&

LAT...LON 3367 11353 3361 11329 3343 11332 3347 11358

$$

MCLANE

464 
WGUS75 KPSR 170428
FFSPSR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
928 PM MST THU AUG 16 2012

AZC012-013-170435-
/O.CAN.KPSR.FF.W.0032.000000T0000Z-120817T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LA PAZ AZ-MARICOPA AZ-
928 PM MST THU AUG 16 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR EXTREME WEST
CENTRAL MARICOPA AND EAST CENTRAL LA PAZ COUNTIES...

HEAVY RAINFALL HAS ENDED ACROSS THE WARNED AREA.

MOTORISTS SHOULD CONTINUE TO BE ALERT FOR WATER THAT HAS PONDED ON 
ROADWAYS AND INDIVIDUALS RESIDING NEAR WASHES AND OTHER DRAINAGES 
SHOULD REMAIN VIGILANT...AS RUNOFF WILL CONTINUE TO KEEP WATER HIGH 
IN SOME AREAS.

LAT...LON 3367 11353 3361 11329 3343 11332 3347 11358

$$

MCLANE

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 16, 6:16 PM MST	Special Weather Statement	PSR		44 min
Aug 16, 6:43 PM MST	Areal Flood Advisory	PSR	La Paz, Yuma	106 min
Aug 16, 6:50 PM MST	Severe Thunderstorm Warning	PSR	La Paz, Maricopa	40 min
Aug 16, 8:25 PM MST	Areal Flood Advisory	PSR	La Paz, Maricopa	110 min
Aug 16, 9:02 PM MST	Areal Flood Advisory	PSR	Maricopa	118 min
Aug 16, 11:10 PM MST	Flash Flood Warning	PSR	Maricopa	2 hr
Aug 16, 11:29 PM MST	Areal Flood Advisory	PSR	La Paz	2 hr
Aug 16, 11:41 PM MST	Flash Flood Warning	PSR	Maricopa	3 hr
Aug 17, 12:54 AM MST	Areal Flood Advisory	PSR	La Paz, Yuma	111 min
Aug 17, 1:14 AM MST	Areal Flood Advisory	PSR	Maricopa	2 hr
Aug 17, 2:43 AM MST	Areal Flood Warning	PSR	Maricopa	4 hr
Aug 17, 6:26 AM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Aug 17, 11:16 AM MST	Areal Flood Advisory	PSR	Maricopa	119 min
Aug 17, 11:42 AM MST	Flash Flood Warning	PSR	Maricopa	2 hr
Aug 17, 11:59 AM MST	Blowing Dust Advisory	PSR		2 hr
Aug 17, 12:25 PM MST	Flash Flood Warning	PSR	Maricopa, Pinal	2 hr
Aug 17, 2:45 PM MST	Blowing Dust Advisory	PSR		91 min

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.