Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 2, NWS Phoenix, AZ

July 13, 2012La Paz County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Jul 13, 2012, 11:17 AM 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: Jul 13, 2012, 11:17 AM MST (18:17 UTC)
Expired: Jul 13, 2012, 2:15 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 Phoenix radar (KIWA), 192 km from the middle of the area, began a volume at 18:18 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

Phoenix, AZ (KPSR), launched 12:00Z, 6.3 hours before the alert went out and 160 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: 611 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 1506 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 72 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.

125 
WGUS55 KPSR 131817
FFWPSR
AZC012-132115-
/O.NEW.KPSR.FF.W.0002.120713T1817Z-120713T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
1117 AM MST FRI JUL 13 2012

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

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

* UNTIL 215 PM MST

* AT 1113 AM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED  
VERY HEAVY RAIN FROM A THUNDERSTORM OVER THE WARNED AREA. RADAR 
ESTIMATES IN EXCESS OF ONE INCH OF RAIN HAS FALLEN IN THE PAST 
HOUR...POTENTIALLY LEADING TO FLASH FLOODING. FLOODING MAY AFFECT 
PORTIONS OF HIGHWAY 60 EAST OF WENDEN.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ALAMO STATE
  PARK

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR
VEHICLE INTO AREAS WHERE RUNNING WATER COVERS THE ROADWAY. JUST ONE
FOOT OF FLOWING WATER CAN BE POWERFUL ENOUGH TO SWEEP VEHICLES OFF
THE ROAD. MAKE THE SMART CHOICE TURN AROUND DONT DROWN.

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.

&&

LAT...LON 3431 11346 3431 11334 3430 11333 3373 11334
      3378 11348 3429 11358 3432 11353 3432 11347

$$

MO

2 follow-up statements

367 
WGUS75 KPSR 132004
FFSPSR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
104 PM MST FRI JUL 13 2012

AZC012-132115-
/O.CON.KPSR.FF.W.0002.000000T0000Z-120713T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LA PAZ AZ-
104 PM MST FRI JUL 13 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 215 PM MST FOR
NORTHEASTERN LA PAZ COUNTY...

AT 1258 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED 
LIGHT RAIN OVER THE WARNED AREA.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ALAMO STATE 
PARK.

WHILE HEAVY RAIN HAS MOVED NORTH OUT OF THE WARNING AREA...RADAR 
ESTIMATES THAT 1 TO 3 INCHES OF RAIN FELL NEAR AND NORTHEAST OF 
WENDEN. RUNOFF AND FLOODING FROM THE HEAVY RAIN MAY STILL BE A 
THREAT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL 
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS AREAS ALONG THE 
BANKS OF CREEKS AND STREAMS.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

&&

LAT...LON 3431 11346 3431 11334 3430 11333 3373 11334
      3378 11348 3429 11358 3432 11353 3432 11347

$$

WOODALL

480 
WGUS75 KPSR 132108
FFSPSR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
208 PM MST FRI JUL 13 2012

AZC012-132116-
/O.EXP.KPSR.FF.W.0002.000000T0000Z-120713T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LA PAZ AZ-
208 PM MST FRI JUL 13 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 215 PM MST FOR NORTHEASTERN
LA PAZ COUNTY...

RAIN HAS MOVED OUT OF NORTHEASTERN LA PAZ COUNTY...AND THE THREAT 
FOR RUNOFF AND FLOODING HAS DECREASED. THEREFORE...THE FLASH FLOOD 
WARNING WILL BE ALLOWED TO EXPIRE.

ADDITIONAL THUNDERSTORMS WITH HEAVY RAIN ARE EXPECTED THROUGH THE 
AFTERNOON AND EVENING. PAY ATTENTION TO THE WEATHER...AND REMAIN 
ALERT FOR LATER UPDATES.

&&

LAT...LON 3431 11346 3431 11334 3430 11333 3373 11334
      3378 11348 3429 11358 3432 11353 3432 11347

$$

WOODALL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 5:58 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	62 min
Jul 12, 6:39 PM MST	Areal Flood Advisory	PSR	Maricopa	111 min
Jul 12, 7:40 PM MST	Special Weather Statement	PSR	Maricopa	65 min
Jul 13, 8:34 AM MST	Areal Flood Advisory	PSR	Maricopa, Pinal	116 min
Jul 13, 10:37 AM MST	Areal Flood Advisory	PSR	La Paz	113 min
Jul 13, 11:24 AM MST	Areal Flood Advisory	PSR	Gila	111 min
Jul 13, 11:56 AM MST	Areal Flood Advisory	PSR	La Paz	2 hr
Jul 13, 12:16 PM MST	Flash Flood Warning	PSR	La Paz	119 min
Jul 13, 12:20 PM MST	Special Weather Statement	PSR	Gila	40 min
Jul 13, 12:25 PM MST	Areal Flood Advisory	PSR	Gila, Maricopa	110 min
Jul 13, 12:48 PM MST	Flash Flood Warning	PSR	Gila	117 min
Jul 13, 1:18 PM MST	Flash Flood Watch	PSR		11 hr
Jul 13, 2:18 PM MST	Areal Flood Advisory	PSR	La Paz	117 min
Jul 13, 2:57 PM MST	Special Weather Statement	PSR		33 min
Jul 13, 3:05 PM MST	Areal Flood Advisory	PSR	Maricopa	115 min
Jul 13, 3:59 PM MST	Special Weather Statement	PSR		46 min
Jul 13, 4:21 PM MST	Areal Flood Advisory	PSR	Gila	114 min
Jul 13, 4:46 PM MST	Special Weather Statement	PSR		44 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.