Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 36, NWS Phoenix, AZ

August 17, 2012Maricopa County, Pinal County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Aug 17, 2012, 12:25 PM MST for Maricopa County, Pinal 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 17, 2012, 12:25 PM MST (19:25 UTC)
Expired: Aug 17, 2012, 2:30 PM MST
In force: 2 hr
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Flood severity: None

Counties Maricopa County, AZ, Pinal County, AZ

The radar

The Phoenix radar (KIWA), 72 km from the middle of the area, began a volume at 19:28 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

Tuscon, AZ (KDMA), launched 12:00Z, 7.4 hours before the alert went out and 149 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: 560 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 1232 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 47 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.

457 
WGUS55 KPSR 171925
FFWPSR
AZC013-021-172130-
/O.NEW.KPSR.FF.W.0036.120817T1925Z-120817T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
1225 PM MST FRI AUG 17 2012

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL MARICOPA COUNTY IN SOUTH CENTRAL ARIZONA...
  EXTREME WEST CENTRAL PINAL COUNTY IN SOUTH CENTRAL ARIZONA...

* UNTIL 230 PM MST

* AT 1224 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS 
  DETECTED VERY HEAVY RAIN THAT WILL CAUSE FLASH
  FLOODING...PARTICULARLY ALONG PORTIONS OF INTERSTATE HIGHWAY 8
  BETWEEN GILA BEND AND CASA GRANDE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOST FLOOD DEATHS OCCUR IN MOTORIZED VEHICLES. WHEN ENCOUNTERING
FLOODED ROADS...MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

NEVER ATTEMPT TO CROSS FLOWING WATER OR WATER OF UNKNOWN DEPTH.

&&

LAT...LON 3285 11211 3275 11227 3289 11248 3300 11232

$$

WATERS

1 follow-up statement

007 
WGUS75 KPSR 172124
FFSPSR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
224 PM MST FRI AUG 17 2012

AZC013-021-172130-
/O.EXP.KPSR.FF.W.0036.000000T0000Z-120817T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
PINAL AZ-MARICOPA AZ-
224 PM MST FRI AUG 17 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 230 PM MST FOR SOUTH
CENTRAL MARICOPA AND EXTREME WEST CENTRAL PINAL COUNTIES...

RAIN HAS TAPERED OFF ACROSS THE WARNED AREA. THE FLASH FLOOD WARNING 
THAT WAS IN EFFECT FOR SOUTH CENTRAL MARICOPA AND EXTREME WEST 
CENTRAL PINAL COUNTIES WILL BE ALLOWED TO EXPIRE.

RESIDENTS SHOULD REMAIN ALERT FOR WATER PONDED ON ROADWAYS... 
ESPECIALLY IN LOW LYING AREAS.

LAT...LON 3285 11211 3275 11227 3289 11248 3300 11232

$$

MCLANE

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, 11:10 PM MST	Flash Flood Warning	PSR	Maricopa	2 hr
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, 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; radar from the NEXRAD Level II archive.