Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 47, NWS Phoenix, AZ

August 21, 2012La Paz County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Aug 21, 2012, 6:51 PM MST for La Paz County, Arizona. It was in force for 75 min. 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 21, 2012, 6:51 PM MST (01:51 UTC)
Expired: Aug 21, 2012, 8:06 PM MST
In force: 75 min
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Flood severity: None

County La Paz County, AZ

The radar

The Yuma radar (KYUX), 150 km from the middle of the area, began a volume at 01:50 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, 1.9 hours before the alert went out and 132 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: 970 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 2360 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -24 m²/s²
0-3 km storm-relative helicity: 21 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.

713 
WGUS55 KPSR 220151
FFWPSR
AZC012-220315-
/O.NEW.KPSR.FF.W.0047.120822T0151Z-120822T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
651 PM MST TUE AUG 21 2012

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

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

* UNTIL 815 PM MST

* AT 646 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED   
  VERY HEAVY RAIN FROM STRONG THUNDERSTORMS THAT WILL CAUSE FLASH 
  FLOODING. RADAR ESTIMATES THAT THREE QUARTERS TO ONE INCH OF 
  RAINFALL HAS FALLEN OVER THE US 60 AND INTERSTATE 10 CORRIDORS
  IN THE LAST HALF HOUR. THIS HEAVY RAINFALL IN SUCH A SHORT TIME
  WILL LEAD TO PONDING AND RUNNING OF WATER ACROSS AREA ROADWAYS.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO VICKSBURG
  JUNCTION...US 60 EAST OF BRENDA AND PORTIONS OF INTERSTATE 10 
  EAST OF THE JUNCTION WITH US 60.

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.

&&

LAT...LON 3371 11392 3373 11370 3355 11368 3354 11391

$$

NOLTE

2 follow-up statements

181 
WGUS75 KPSR 220229
FFSPSR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
729 PM MST TUE AUG 21 2012

AZC012-220315-
/O.CON.KPSR.FF.W.0047.000000T0000Z-120822T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LA PAZ AZ-
729 PM MST TUE AUG 21 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 815 PM MST FOR
CENTRAL LA PAZ COUNTY...

AT 723 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED AN 
AREA OF THUNDERSTORMS PRODUCING FLASH FLOODING. RADAR ESTIMATES THAT
ONE AND A HALF TO TWO INCHES OF RAINFALL HAS FALLEN OVER THE AREA
INCLUDING THE ROAD SURFACES OF US 60 AND INTERSTATE 10. EXPECT
PONDING OF WATER CREATING SLICK ROAD SURFACES AND IMPACT TO 
TRAVELERS.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO VICKSBURG
JUNCTION...US HIGH WAY 60 AND INTERSTATE 10 EAST SOUTHEAST OF BRENDA.

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.

&&

LAT...LON 3371 11392 3373 11370 3355 11368 3354 11391

$$

NOLTE

778 
WGUS75 KPSR 220306
FFSPSR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
806 PM MST TUE AUG 21 2012

AZC012-220314-
/O.CAN.KPSR.FF.W.0047.000000T0000Z-120822T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LA PAZ AZ-
806 PM MST TUE AUG 21 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL LA PAZ
COUNTY...

THE STRONGEST STORM AND AREA OF HEAVIEST RAINFALL HAS CONTINUED 
TO BUILD TO THE SOUTHWEST ACROSS SOUTHERN LA PAZ COUNTY 
AND SOUTH OF INTERSTATE 10 OVER THE LAST HALF HOUR GENERALLY
INTO THE RURAL DESERT PORTIONS OF THE COUNTY. THEREFORE...
THE FLASH FLOOD WARNING WILL BE CANCELLED FOR THE AREA. EXPECT
IMPACTS FROM RUNNING WASHES...INCLUDING DEBRIS ACROSS ROAD 
SURFACES AND PONDING OF WATER TO REMAIN FOR THE REGION 
FOR THE NEXT FEW HOURS.


LAT...LON 3371 11392 3373 11370 3355 11368 3354 11391

$$

NOLTE

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 21, 5:10 PM MST	Special Weather Statement	PSR	La Paz	80 min
Aug 21, 5:29 PM MST	Special Weather Statement	PSR	Pinal	46 min
Aug 21, 5:37 PM MST	Flash Flood Warning	PSR	La Paz	83 min
Aug 21, 5:55 PM MST	Severe Thunderstorm Warning	PSR	La Paz	65 min
Aug 21, 5:59 PM MST	Special Weather Statement	PSR	Maricopa	76 min
Aug 21, 6:00 PM MST	Severe Thunderstorm Warning	PSR	La Paz	39 min
Aug 21, 6:09 PM MST	Special Weather Statement	PSR	Pinal	51 min
Aug 21, 6:12 PM MST	Flash Flood Warning	PSR	La Paz	71 min
Aug 21, 6:56 PM MST	Areal Flood Advisory	PSR	Gila, Maricopa, Pinal	3 hr
Aug 21, 6:57 PM MST	Severe Thunderstorm Warning	PSR	Pinal	33 min
Aug 21, 7:03 PM MST	Blowing Dust Advisory	PSR		57 min
Aug 21, 7:05 PM MST	Flash Flood Warning	PSR	Pinal	55 min
Aug 21, 7:09 PM MST	Special Weather Statement	PSR	La Paz	66 min
Aug 21, 7:30 PM MST	Severe Thunderstorm Warning	PSR	Pinal	30 min
Aug 21, 7:37 PM MST	Special Weather Statement	PSR	Maricopa	53 min
Aug 21, 7:49 PM MST	Areal Flood Advisory	PSR	La Paz	90 min
Aug 21, 8:00 PM MST	Flash Flood Warning	PSR	Pinal	30 min
Aug 21, 8:16 PM MST	Areal Flood Advisory	PSR	Maricopa	119 min
Aug 21, 8:28 PM MST	Flash Flood Warning	PSR	Maricopa	2 hr
Aug 21, 9:02 PM MST	Areal Flood Advisory	PSR	Maricopa	118 min
Aug 21, 9:32 PM MST	Areal Flood Advisory	PSR	Maricopa, Pinal	118 min
Aug 21, 9:53 PM MST	Special Weather Statement	PSR		37 min
Aug 21, 10:07 PM MST	Special Weather Statement	PSR	Yuma	38 min
Aug 21, 10:24 PM MST	Blowing Dust Advisory	PSR		3 hr
Aug 21, 10:40 PM MST	Areal Flood Advisory	PSR	La Paz	81 min
Aug 21, 10:54 PM MST	Special Weather Statement	PSR		66 min
Aug 21, 11:15 PM MST	Special Weather Statement	PSR	La Paz	75 min
Aug 22, 1:34 PM MST	Flash Flood Watch	PSR		15 hr
Aug 22, 1:44 PM MST	Flash Flood Warning	PSR	Maricopa, Pinal	3 hr
Aug 22, 2:32 PM MST	Areal Flood Advisory	PSR	Maricopa	118 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; radar from the NEXRAD Level II archive.