Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 33, NWS Phoenix, AZ

August 16, 2012Maricopa County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Aug 16, 2012, 11:10 PM MST for 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, 11:10 PM MST (06:10 UTC)
Expired: Aug 17, 2012, 1:15 AM MST
In force: 2 hr
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Flood severity: None

County Maricopa County, AZ

The nearest sounding before it

Phoenix, AZ (KPSR), launched 00:00Z, 6.2 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: 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.

616 
WGUS55 KPSR 170610
FFWPSR
AZC013-170815-
/O.NEW.KPSR.FF.W.0033.120817T0610Z-120817T0815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
1110 PM MST THU AUG 16 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 115 AM MST

* AT 1105 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 3399 11152 3399 11146 3386 11145 3386 11151

$$

MEYERS

3 follow-up statements

938 
WGUS75 KPSR 170654
FFSPSR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
1154 PM MST THU AUG 16 2012

AZC013-170815-
/O.CON.KPSR.FF.W.0033.000000T0000Z-120817T0815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MARICOPA AZ-
1154 PM MST THU AUG 16 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 115 AM MST FOR
EXTREME NORTHEASTERN MARICOPA COUNTY...

AT 1142 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUE TO 
DETECT SHOWERS AND THUNDERSTORMS OVER THE SUNFLOWER BURN AREA. 
OVER ONE AND ONE HALF INCHES OF RAIN HAS FALLEN OVER THE BURN AREA 
IN THE LAST HOUR...AND LIGHT RAIN CONTINUES TO FALL. STREAM GAGE 
SENSORS NEAR THE TONTO NATIONAL FOREST WORK CENTER INDICATE THE FLOW 
IN SYCAMORE CREEK TO BE CLOSE TO 7900 CFS AND THE DEPTH OF THE WATER 
TO BE OVER 10 FEET.  

LOCATIONS IN THE WARNING INCLUDE SUNFLOWER AND SYCAMORE 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 3399 11152 3399 11146 3386 11145 3386 11151

$$

MEYERS

077 
WGUS75 KPSR 170728
FFSPSR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
1228 AM MST FRI AUG 17 2012

AZC013-170815-
/O.CON.KPSR.FF.W.0033.000000T0000Z-120817T0815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MARICOPA AZ-
1228 AM MST FRI AUG 17 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 115 AM MST FOR
EXTREME NORTHEASTERN MARICOPA COUNTY...

AT 1215 AM MST...SHOWERS AND THUNDERSTORMS HAVE DIMINISHED OVER THE 
SUNFLOWER BURN...AND A FEW LIGHT RAIN SHOWERS PERSIST IN THE AREA. 
STREAM GAGE SENSORS NEAR THE TONTO NATIONAL FOREST WORK CENTER 
INDICATE THE FLOW IN SYCAMORE CREEK HAS DROPPED TO AROUND 2100 CFS 
AND THE DEPTH OF THE WATER IS APPROXIMATELY 7.5 FEET. EVEN THOUGH 
THE RAIN HAS SUBSIDED...FLOWS WILL REMAIN ELEVATED IN SYCAMORE CREEK 
FOR SEVERAL MORE HOURS...AND LOW-WATER CROSSINGS WILL BE INUNDATED.

LOCATIONS IN THE WARNING INCLUDE...SUNFLOWER AND SYCAMORE 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.

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

&&

LAT...LON 3399 11152 3399 11146 3386 11145 3386 11151

$$

MEYERS

627 
WGUS75 KPSR 170815
FFSPSR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
115 AM MST FRI AUG 17 2012

AZC013-170825-
/O.EXP.KPSR.FF.W.0033.000000T0000Z-120817T0815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MARICOPA AZ-
115 AM MST FRI AUG 17 2012

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

THUNDERSTORMS OVER THE SUNFLOWER BURN AREA HAVE ENDED. THE RUNOFF 
WILL CONTINUE FOR THE NEXT SEVERAL HOURS. A FLOOD ADVISORY HAS BEEN 
ISSUED FOR THE BURN AREA. 

LAT...LON 3399 11152 3399 11146 3386 11145 3386 11151

$$

LEINS

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, 7:08 PM MST	Flash Flood Warning	PSR	La Paz, Maricopa	2 hr
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, 11:29 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.