Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 20, NWS Phoenix, AZ

July 14, 2012Maricopa County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Jul 14, 2012, 5:03 PM MST for Maricopa County, Arizona. It was in force for 117 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 14, 2012, 5:03 PM MST (00:03 UTC)
Expired: Jul 14, 2012, 7:00 PM MST
In force: 117 min
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Flood severity: None

County Maricopa County, AZ

The radar

The Phoenix radar (KIWA), 127 km from the middle of the area, began a volume at 00:04 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.

What was reported inside it

Time	Report	Where	Remark
Jul 14, 6:18 PM MST	FLASH FLOOD	4 Ese Wickenburg, AZ	MUDSLIDE BLOCKING WESTBOUND LANES OF US 60 AT MM 115

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Phoenix, AZ (KPSR), launched 00:00Z, 0.1 hours before the alert went out and 95 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: 32 J/kg
Mixed-layer CIN: -218 J/kg
Mixed-layer LCL: 1607 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 119 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.

566 
WGUS55 KPSR 150003
FFWPSR
AZC013-150200-
/O.NEW.KPSR.FF.W.0020.120715T0003Z-120715T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
503 PM MST SAT JUL 14 2012

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WEST CENTRAL MARICOPA COUNTY IN SOUTH CENTRAL ARIZONA...
  THIS INCLUDES WICKENBURG...

* UNTIL 700 PM MST

* AT 455 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED
  FLASH FLOODING FROM A THUNDERSTORM 11 MILES SOUTHWEST OF
  WICKENBURG...MOVING NORTHEAST AT 25 MPH.

* THE STORM PRODUCING FLASH FLOODING WILL IMPACT US HWY 60 AND US 
HWY 93.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR
VEHICLE INTO AREAS WHERE RUNNING WATER COVERS THE ROADWAY. JUST ONE
FOOT OF FLOWING WATER CAN BE POWERFUL ENOUGH TO SWEEP VEHICLES OFF
THE ROAD. MAKE THE SMART CHOICE TURN AROUND DONT DROWN.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. REMEMBER TURN AROUND DONT DROWN.

&&

LAT...LON 3400 11272 3400 11269 3399 11268 3398 11265
      3365 11281 3374 11313 3401 11305 3401 11273

$$

WATERS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 14, 5:08 PM MST	Special Weather Statement	PSR		67 min
Jul 14, 5:26 PM MST	Special Weather Statement	PSR		64 min
Jul 14, 6:06 PM MST	Areal Flood Advisory	PSR	La Paz	3 hr
Jul 14, 7:32 PM MST	Special Weather Statement	PSR	Maricopa	43 min
Jul 14, 8:02 PM MST	Areal Flood Advisory	PSR	La Paz, Maricopa	41 min
Jul 14, 8:45 PM MST	Areal Flood Advisory	PSR	Maricopa	55 min
Jul 15, 1:35 PM MST	Special Weather Statement	PSR		25 min
Jul 15, 2:04 PM MST	Special Weather Statement	PSR		41 min
Jul 15, 2:07 PM MST	Areal Flood Advisory	PSR	Pinal	113 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.