Alert archive / Arizona / Flash Flood Warnings in 2015

Flash Flood Warning 21, NWS Phoenix, AZ

September 22, 2015Maricopa County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Sep 22, 2015, 7:23 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: Sep 22, 2015, 7:23 PM MST (02:23 UTC)
Expired: Sep 22, 2015, 9:15 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), 11 km from the middle of the area, began a volume at 02:24 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, 2.4 hours before the alert went out and 26 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: 343 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 1479 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 22 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.

819 
WGUS55 KPSR 230223
FFWPSR
AZC013-230415-
/O.NEW.KPSR.FF.W.0021.150923T0223Z-150923T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
723 PM MST TUE SEP 22 2015

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN MARICOPA COUNTY IN SOUTH CENTRAL ARIZONA...

* UNTIL 915 PM MST
    
* AT 720 PM MST...DOPPLER RADAR AND AUTOMATED RAIN GAUGES INDICATED 
  HEAVY RAIN IN THE MESA AREA WITH OVER ONE AND A HALF INCHES IN THE 
  PAST HOUR. NUMEROUS ROADS ARE BEGINNING TO FLOOD...AND 
  FURTHER FLASH FLOODING IS EXPECTED.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  MESA...GILBERT...EAST MESA AND SUPERSTITION SPRINGS MALL. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 3339 11162 3334 11164 3335 11169 3336 11175
      3344 11179 3346 11174

$$

18

3 follow-up statements

590 
WGUS75 KPSR 230251
FFSPSR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
751 PM MST TUE SEP 22 2015

AZC013-230415-
/O.CON.KPSR.FF.W.0021.000000T0000Z-150923T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MARICOPA AZ-
751 PM MST TUE SEP 22 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 PM MST FOR
EASTERN MARICOPA COUNTY...

AT 749 PM MST...DOPPLER RADAR INDICATED RAINFALL ENDED ACROSS THE 
AREA...HOWEVER AUTOMATED RAIN GAUGES SHOWED BETWEEN ONE AND TWO 
INCHES OF RAIN HAVE FALLEN SINCE 630 PM. THERE HAVE BEEN SEVERAL 
REPORTS OF FLOODED ROADS...AND ADDITIONAL FLASH FLOODING IS 
EXPECTED. 
 
SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
MESA...GILBERT...EAST MESA AND SUPERSTITION SPRINGS MALL. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 3339 11162 3334 11164 3335 11169 3336 11175
      3344 11179 3346 11174

$$

18

774 
WGUS75 KPSR 230336
FFSPSR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
836 PM MST TUE SEP 22 2015

AZC013-230415-
/O.CON.KPSR.FF.W.0021.000000T0000Z-150923T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MARICOPA AZ-
836 PM MST TUE SEP 22 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 PM MST FOR
EASTERN MARICOPA COUNTY...

AT 834 PM MST...LOCAL LAW ENFORCEMENT FROM MESA REPORTED SEVERAL 
STREET CLOSURES DUE TO HIGH WATER. RAINFALL BETWEEN ONE AND TWO 
INCHES HAS LED TO FLOODING...AND IT WILL TAKE SOME TIME BEFORE THE 
WATER FULLY RECEDES. 

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
MESA...GILBERT...EAST MESA AND SUPERSTITION SPRINGS MALL. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 3339 11162 3334 11164 3335 11169 3336 11175
      3344 11179 3346 11174

$$

18

080 
WGUS75 KPSR 230414
FFSPSR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
914 PM MST TUE SEP 22 2015

AZC013-230421-
/O.EXP.KPSR.FF.W.0021.000000T0000Z-150923T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MARICOPA AZ-
914 PM MST TUE SEP 22 2015

...THE FLASH FLOOD WARNING FOR EASTERN MARICOPA COUNTY WILL EXPIRE AT
915 PM MST...

THE HEAVY RAIN HAS ENDED...AND FLASH FLOODING IS NO LONGER EXPECTED. 
HOWEVER...SOME LINGERING RUNOFF AND CONSIDERABLE LEFT OVER PONDING 
IN SOME SPOTS CAN BE EXPECTED FOR A COUPLE OF MORE HOURS. 
 
TO POSE A THREAT. PLEASE CONTINUE TO HEED ALL ROAD CLOSURES.

LAT...LON 3339 11162 3334 11164 3335 11169 3336 11175
      3344 11179 3346 11174

$$

AJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 22, 5:11 PM MST	Special Weather Statement	PSR	Yuma	34 min
Sep 22, 5:42 PM MST	Special Weather Statement	PSR		33 min
Sep 22, 5:51 PM MST	Special Weather Statement	PSR	Maricopa	24 min
Sep 22, 6:01 PM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Sep 22, 6:04 PM MST	Special Weather Statement	PSR		26 min
Sep 22, 6:09 PM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Sep 22, 6:18 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	27 min
Sep 22, 6:34 PM MST	Special Weather Statement	PSR	Pinal	41 min
Sep 22, 6:36 PM MST	Areal Flood Advisory	PSR	Maricopa	5 hr
Sep 22, 6:43 PM MST	Special Weather Statement	PSR	Pinal	47 min
Sep 22, 7:14 PM MST	Special Weather Statement	PSR	Pinal	46 min
Sep 22, 7:17 PM MST	Blowing Dust Advisory	PSR		70 min
Sep 22, 7:53 PM MST	Special Weather Statement	PSR	Pinal	52 min
Sep 22, 8:10 PM MST	Areal Flood Advisory	PSR	Pinal	3 hr

Nearby

Flash Flood Warnings in Arizona, 2015 Every flash flood warning in 2015

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.