Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 1, NWS Phoenix, AZ

July 11, 2012Maricopa County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Jul 11, 2012, 9:23 PM MST for Maricopa County, Arizona. It was in force for 112 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: Jul 11, 2012, 9:23 PM MST (04:23 UTC)
Expired: Jul 11, 2012, 11:15 PM MST
In force: 112 min
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Flood severity: None

County Maricopa County, AZ

The radar

The Phoenix radar (KIWA), 74 km from the middle of the area, began a volume at 04:25 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 00:00Z, 4.4 hours before the alert went out and 72 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: 198 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 3123 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: 27 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.

601 
WGUS55 KPSR 120423
FFWPSR
AZC013-120615-
/O.NEW.KPSR.FF.W.0001.120712T0423Z-120712T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
923 PM MST WED JUL 11 2012

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EXTREME NORTHEASTERN MARICOPA COUNTY IN SOUTH CENTRAL ARIZONA...
  THIS INCLUDES SYCAMORE CREEK...SUNFLOWER...

* UNTIL 1115 PM MST

* AT 920 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED
  HEAVY RAIN OVER THE SUNFLOWER BURN AREA. THE RAIN WILL PRODUCE
  SIGNIFICANT FLOW IN CREEKS AND WASHES ACCOMPANIED BY MUD...ROCKS...
  AND DEBRIS.

* FLASH FLOODING OF THE SYCAMORE CREEK DRAINAGE IS IMMINENT AND WILL
  IMPACT THE COMMUNITY OF SUNFLOWER...AS WELL AS LOW WATER CROSSINGS
  OF FOREST ROADS AND TRAILS. THIS INCLUDES FOREST ROAD 22 SOUTH OF
  HIGHWAY 87...THE ARIZONA TRAIL...AND BOULDER CREEK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE NEAR THE BANKS OF SYCAMORE CREEK OR OTHER NEARBY DRAINAGE
AREAS MOVE IMMEDIATELY TO HIGHER GROUND. DO NOT DRIVE YOUR VEHICLE
INTO AREAS WHERE WATER COVERS THE ROAD. TURN AROUND DONT DROWN.

LIFE-THREATENING FLOODING OF CREEKS...ROADS AND NORMALLY DRY WASHES
IS LIKELY. THE HEAVY RAINS WILL TRIGGER MUD AND DEBRIS FLOWS...AND
ROCKSLIDES IN STEEP TERRAIN...ESPECIALLY NEAR THE BURN AREA.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT.

&&

LAT...LON 3400 11152 3400 11145 3392 11146 3385 11144
      3384 11149

$$

WOODALL

5 follow-up statements

952 
WGUS75 KPSR 120440
FFSPSR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
940 PM MST WED JUL 11 2012

AZC013-120615-
/O.CON.KPSR.FF.W.0001.000000T0000Z-120712T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MARICOPA AZ-
940 PM MST WED JUL 11 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1115 PM MST FOR 
EXTREME NORTHEASTERN MARICOPA COUNTY...INCLUDING SYCAMORE CREEK AND 
THE SUNFLOWER BURN AREA...

AT 935 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED 
THUNDERSTORMS WITH HEAVY RAIN OVER THE SUNFLOWER BURN AREA.

RADAR ESTIMATED NEARLY 1/2 INCH OF RAIN FELL OVER CENTRAL AND 
NORTHERN PORTIONS OF THE BURN AREA BETWEEN 920 PM AND 935 PM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE NEAR THE BANKS OF SYCAMORE CREEK OR OTHER NEARBY DRAINAGE
AREAS MOVE IMMEDIATELY TO HIGHER GROUND. DO NOT DRIVE YOUR VEHICLE
INTO AREAS WHERE WATER COVERS THE ROAD. TURN AROUND DONT DROWN.

LIFE-THREATENING FLOODING OF CREEKS...ROADS AND NORMALLY DRY WASHES
IS LIKELY. THE HEAVY RAINS WILL TRIGGER MUD AND DEBRIS FLOWS...AND
ROCKSLIDES IN STEEP TERRAIN...ESPECIALLY NEAR THE BURN AREA.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT.

LAT...LON 3400 11152 3400 11145 3392 11146 3385 11144
      3384 11149

$$

WOODALL

461 
WGUS75 KPSR 120502
FFSPSR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
1002 PM MST WED JUL 11 2012

AZC013-120615-
/O.CON.KPSR.FF.W.0001.000000T0000Z-120712T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MARICOPA AZ-
1002 PM MST WED JUL 11 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1115 PM MST FOR
EXTREME NORTHEASTERN MARICOPA COUNTY...

AT 959 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED 
LIGHT TO MODERATE RAIN OVER WESTERN PORTIONS OF THE SUNFLOWER BURN 
AREA. RADAR INDICATED THAT OVER 1/2 INCH OF RAIN FELL OVER CENTRAL 
AND NORTHERN PORTIONS OF THE BURN AREA SINCE 920 PM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE NEAR THE BANKS OF SYCAMORE CREEK OR OTHER NEARBY DRAINAGE
AREAS MOVE IMMEDIATELY TO HIGHER GROUND. DO NOT DRIVE YOUR VEHICLE
INTO AREAS WHERE WATER COVERS THE ROAD. TURN AROUND DONT DROWN.

LIFE-THREATENING FLOODING OF CREEKS...ROADS AND NORMALLY DRY WASHES
IS LIKELY. THE HEAVY RAINS WILL TRIGGER MUD AND DEBRIS FLOWS...AND
ROCKSLIDES IN STEEP TERRAIN...ESPECIALLY NEAR THE BURN AREA.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT.


LAT...LON 3400 11152 3400 11145 3392 11146 3385 11144
      3384 11149

$$

WOODALL

844 
WGUS75 KPSR 120541
FFSPSR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
1041 PM MST WED JUL 11 2012

AZC013-120615-
/O.CON.KPSR.FF.W.0001.000000T0000Z-120712T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MARICOPA AZ-
1041 PM MST WED JUL 11 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1115 PM MST FOR 
EXTREME NORTHEASTERN MARICOPA COUNTY...INCLUDING SYCAMORE CREEK AND 
THE SUNFLOWER BURN AREA...

AT 1036 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED 
LIGHT RAIN OVER SOUTHWESTERN PORTIONS OF THE SUNFLOWER BURN AREA. 
RADAR INDICATED THAT OVER 1/2 INCH OF RAIN FELL OVER PORTIONS OF THE 
BURN AREA BETWEEN 920 PM AND 945 PM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE NEAR THE BANKS OF SYCAMORE CREEK OR OTHER NEARBY DRAINAGE
AREAS MOVE IMMEDIATELY TO HIGHER GROUND. DO NOT DRIVE YOUR VEHICLE
INTO AREAS WHERE WATER COVERS THE ROAD. TURN AROUND DONT DROWN.

LIFE-THREATENING FLOODING OF CREEKS...ROADS AND NORMALLY DRY WASHES
IS LIKELY. THE HEAVY RAINS WILL TRIGGER MUD AND DEBRIS FLOWS...AND
ROCKSLIDES IN STEEP TERRAIN...ESPECIALLY NEAR THE BURN AREA.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT.

LAT...LON 3400 11152 3400 11145 3392 11146 3385 11144
      3384 11149

$$

WOODALL

446 
WGUS75 KPSR 120601
FFSPSR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
1101 PM MST WED JUL 11 2012

AZC013-120615-
/O.CON.KPSR.FF.W.0001.000000T0000Z-120712T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MARICOPA AZ-
1101 PM MST WED JUL 11 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1115 PM MST FOR 
EXTREME NORTHEASTERN MARICOPA COUNTY...INCLUDING SYCAMORE CREEK AND 
THE SUNFLOWER BURN AREA...

AT 1058 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED 
HEAVY RAIN ENTERING THE SOUTHERN PORTION OF THE SUNFLOWER BURN AREA. 
AN ADDITIONAL 1/4 INCH OF RAIN IS POSSIBLE AS THIS RAIN MOVES ACROSS 
THE BURN AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE NEAR THE BANKS OF SYCAMORE CREEK OR OTHER NEARBY DRAINAGE
AREAS MOVE IMMEDIATELY TO HIGHER GROUND. DO NOT DRIVE YOUR VEHICLE
INTO AREAS WHERE WATER COVERS THE ROAD. TURN AROUND DONT DROWN.

LIFE-THREATENING FLOODING OF CREEKS...ROADS AND NORMALLY DRY WASHES
IS LIKELY. THE HEAVY RAINS WILL TRIGGER MUD AND DEBRIS FLOWS...AND
ROCKSLIDES IN STEEP TERRAIN...ESPECIALLY NEAR THE BURN AREA.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT.


LAT...LON 3400 11152 3400 11145 3392 11146 3385 11144
      3384 11149

$$

WOODALL

191 
WGUS75 KPSR 120618
FFSPSR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
1118 PM MST WED JUL 11 2012

AZC013-120625-
/O.EXP.KPSR.FF.W.0001.000000T0000Z-120712T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MARICOPA AZ-
1118 PM MST WED JUL 11 2012

...THE FLASH FLOOD WARNING HAS EXPIRED FOR EXTREME NORTHEASTERN
MARICOPA COUNTY...

MODERATE TO HEAVY RAIN CONTINUED WEST OF THE COMMUNITY 
SUNFLOWER...WITH ONLY LIGHT RAIN PERSISTING OVER SOUTHERN PORTIONS 
OF THE SUNFLOWER BURN AREA. THE FLASH FLOOD WARNING WAS ALLOWED TO 
EXPIRE.

IF YOU ARE ALONG SYCAMORE CREEK...BE AWARE OF WATER RISES AND 
INCREASED FLOW. REPORT ANY FLOODING TO LOCAL LAW ENFORCEMENT FOR 
RELAY TO THE NATIONAL WEATHER SERVICE.

LAT...LON 3400 11152 3400 11145 3392 11146 3385 11144
      3384 11149

$$

WOODALL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 5:24 PM MST	Areal Flood Advisory	PSR	La Paz	111 min
Jul 11, 5:46 PM MST	Special Weather Statement	PSR	La Paz	44 min
Jul 11, 6:31 PM MST	Special Weather Statement	PSR		44 min
Jul 11, 8:35 PM MST	Blowing Dust Advisory	PSR		85 min
Jul 11, 9:00 PM MST	Areal Flood Advisory	PSR	Pinal	78 min
Jul 11, 9:58 PM MST	Special Weather Statement	PSR		47 min
Jul 11, 10:22 PM MST	Areal Flood Advisory	PSR	Maricopa, Pinal	83 min
Jul 11, 10:27 PM MST	Blowing Dust Advisory	PSR		79 min
Jul 11, 10:35 PM MST	Special Weather Statement	PSR	Maricopa	40 min
Jul 12, 12:16 AM MST	Areal Flood Advisory	PSR	Maricopa	119 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.