Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 22, NWS Phoenix, AZ

July 24, 2012Maricopa County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Jul 24, 2012, 2:43 AM MST for Maricopa County, Arizona. It was in force for 4 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 24, 2012, 2:43 AM MST (09:43 UTC)
Expired: Jul 24, 2012, 6:45 AM MST
In force: 4 hr
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Flood severity: None

County Maricopa County, AZ

The radar

The Phoenix radar (KIWA), 70 km from the middle of the area, began a volume at 09:43 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, 9.7 hours before the alert went out and 70 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: 251 J/kg
Mixed-layer CIN: -70 J/kg
Mixed-layer LCL: 2393 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 57 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.

520 
WGUS55 KPSR 240943
FFWPSR
AZC013-241145-
/O.NEW.KPSR.FF.W.0022.120724T0943Z-120724T1145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
243 AM MST TUE JUL 24 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 445 AM MST

* AT 240 AM 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 3381 11140 3381 11150 3400 11157 3400 11144
      3393 11145

$$

LEINS

6 follow-up statements

627 
WGUS75 KPSR 241005
FFSPSR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
305 AM MST TUE JUL 24 2012

AZC013-241145-
/O.CON.KPSR.FF.W.0022.000000T0000Z-120724T1145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MARICOPA AZ-
305 AM MST TUE JUL 24 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 AM MST FOR
EXTREME NORTHEASTERN MARICOPA COUNTY...

AT 259 AM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A 
THUNDERSTORM CAPABLE OF PRODUCING FLASH FLOODING OVER THE SUNFLOWER 
BURN AREA. RAINFALL TOTALS ON THE UPPER PORTION OF THE BURN SITE 
RANGE FROM A QUARTER TO A THIRD OF AN INCH OVER A 15 MINUTE PERIOD. 
ADDITIONAL RAINFALL OF A QUARTER TO A HALF AN INCH IS POSSIBLE 
BEFORE THE STORMS DISSIPATE. 

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 3381 11140 3381 11150 3400 11157 3400 11144
      3393 11145

$$

LEINS

345 
WGUS75 KPSR 241030
FFSPSR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
330 AM MST TUE JUL 24 2012

AZC013-241145-
/O.CON.KPSR.FF.W.0022.000000T0000Z-120724T1145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MARICOPA AZ-
330 AM MST TUE JUL 24 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 AM MST FOR
EXTREME NORTHEASTERN MARICOPA COUNTY...

AT 327 AM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED 
THUNDERSTORMS CAPABLE OF PRODUCING FLASH FLOODING NEAR THE SUNFLOWER 
BURN AREA. RAIN GAGES ON THE UPPER PORTION OF THE BURN SITE INDICATE 
OVER HALF AN INCH OF RAIN HAS FALLEN SINCE 245 AM. THE STORM HAS 
MOVED EAST OF THE BURN AREA AT THE MOMENT...BUT ADDITIONAL STORMS 
ARE EXPECTED TO MOVE IN FROM THE NORTH BY 4 AM. 

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 3381 11140 3381 11150 3400 11157 3400 11144
      3393 11145

$$

LEINS

550 
WGUS75 KPSR 241111
FFSPSR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
411 AM MST TUE JUL 24 2012

AZC013-241145-
/O.CON.KPSR.FF.W.0022.000000T0000Z-120724T1145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MARICOPA AZ-
411 AM MST TUE JUL 24 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 AM MST FOR
EXTREME NORTHEASTERN MARICOPA COUNTY...

AT 404 AM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED 
HEAVY RAINFALL ON THE NORTHERN PORTION OF THE SUNFLOWER BURN AREA.
RAINFALL TOTALS SINCE 245 AM ARE CLOSE TO THREE QUARTERS OF AN INCH 
ON THE NORTH SIDE OF THE BURN AREA...AND AROUND A QUARTER OF AN INCH 
NEAR THE CONFLUENCE OF THE WEST AND EAST FORKS OF SYCAMORE CREEK. 
RADAR INDICATES ADDITIONAL HEAVY RAINFALL WILL MOVE OVER THE BURN 
SITE BETWEEN 415 AM AND 445 AM...INCREASING THE LIKELIHOOD OF 
DANGEROUS FLASH FLOODING. 

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 3381 11140 3381 11150 3400 11157 3400 11144
      3393 11145

$$

LEINS

881 
WGUS55 KPSR 241125
FFWPSR
AZC013-241345-
/O.EXT.KPSR.FF.W.0022.000000T0000Z-120724T1345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
425 AM MST TUE JUL 24 2012

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS EXTENDED THE

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

* UNTIL 645 AM MST

* AT 423 AM 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 TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE.

&&

LAT...LON 3381 11140 3381 11150 3400 11157 3400 11144
      3393 11145

$$

LEINS

295 
WGUS75 KPSR 241204
FFSPSR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
504 AM MST TUE JUL 24 2012

AZC013-241345-
/O.CON.KPSR.FF.W.0022.000000T0000Z-120724T1345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MARICOPA AZ-
504 AM MST TUE JUL 24 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 AM MST FOR
EXTREME NORTHEASTERN MARICOPA COUNTY...

AT 500 AM MST...HEAVY RAINFALL CONTINUED ACROSS THE SUNFLOWER BURN 
AREA. RAINFALL ACROSS THE UPPER PORTION OF THE BURN SITE HAS 
EXCEEDED ONE INCH SINCE 245 AM THIS MORNING AND IS CLOSE TO A HALF 
INCH ACROSS THE SOUTHERN PORTION. HEAVY RAIN WILL CONTINUE THROUGH 
AT LEAST 6 AM...WITH AN ADDITIONAL QUARTER TO HALF AN INCH LIKELY IN 
AND AROUND THE BURN SITE. 

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 3381 11140 3381 11150 3400 11157 3400 11144
      3393 11145

$$

LEINS

160 
WGUS75 KPSR 241342
FFSPSR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
642 AM MST TUE JUL 24 2012

AZC013-241350-
/O.EXP.KPSR.FF.W.0022.000000T0000Z-120724T1345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MARICOPA AZ-
642 AM MST TUE JUL 24 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 645 AM MST FOR EXTREME
NORTHEASTERN MARICOPA COUNTY...

HEAVY RAINFALL HAS ENDED ACROSS THE SUNFLOWER BURN AREA. SOME FLOW 
IS POSSIBLE ALONG SYCAMORE CREEK HOWEVER WIDESPREAD FLOODING IS NOT 
ANTICIPATED. 

IF FLOODING HAS BEEN OBSERVED ALONG SYCAMORE CREEK...PLEASE ALERT 
LOCAL AUTHORITIES. 

LAT...LON 3381 11140 3381 11150 3400 11157 3400 11144
      3393 11145

$$

LEINS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 5:25 PM MST	Special Weather Statement	PSR	Pinal	50 min
Jul 23, 5:49 PM MST	Special Weather Statement	PSR	Pinal	41 min
Jul 23, 6:24 PM MST	Severe Thunderstorm Warning	PSR	Pinal	51 min
Jul 23, 7:16 PM MST	Special Weather Statement	PSR		44 min
Jul 24, 12:18 AM MST	Flash Flood Warning	PSR	Gila, Maricopa	117 min
Jul 24, 6:14 AM MST	Areal Flood Advisory	PSR	Pinal	2 hr

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.