Alert archive / Arizona / Flash Flood Warnings in 2011

Flash Flood Warning 4, NWS Phoenix, AZ

September 9, 2011La Paz County, Yuma County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Sep 9, 2011, 7:21 PM MST for La Paz County, Yuma County, Arizona. It was in force for 114 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 9, 2011, 7:21 PM MST (02:21 UTC)
Expired: Sep 9, 2011, 9:15 PM MST
In force: 114 min
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Flood severity: None

Counties La Paz County, AZ, Yuma County, AZ

The radar

The Yuma radar (KYUX), 116 km from the middle of the area, began a volume at 02:22 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

Yuma Prvg Ground, AZ (K1Y7), launched 00:00Z, 2.4 hours before the alert went out and 112 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: 379 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 2419 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 17 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.

217 
WGUS55 KPSR 100221
FFWPSR
AZC012-027-100415-
/O.NEW.KPSR.FF.W.0004.110910T0221Z-110910T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
721 PM MST FRI SEP 9 2011

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH CENTRAL YUMA COUNTY IN SOUTHWEST ARIZONA...
  SOUTHWEST LA PAZ COUNTY IN WEST CENTRAL ARIZONA...

* UNTIL 915 PM MST

* AT 718 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED
  THUNDERSTORMS WITH VERY HEAVY RAIN SOUTH OF QUARTZSITE...AND OVER 
  THE CHOCOLATE MOUNTAINS. MOVEMENT WAS SLOWLY EAST.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  QUARTZSITE...AND HIGHWAY 95 SOUTH OF QUARTZSITE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

RADAR ESTIMATES THAT 3 TO 4 INCHES OF RAIN HAS FALLEN IN THE WARNING 
AREA SINCE 5 PM. RUNOFF FROM THE HEAVY RAIN WILL AFFECT TYSON 
WASH...GOULD WASH...AND MOHAVE WASH.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE 
DANGERS OF FLOODING. STAY CLEAR OF AREAS WHERE WATER COVERS THE 
ROAD. REMEMBER...TURN AROUND...DONT DROWN.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE.

&&

LAT...LON 3361 11447 3369 11425 3369 11406 3317 11417
      3325 11461

$$

WOODALL

2 follow-up statements

044 
WGUS75 KPSR 100300
FFSPSR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
800 PM MST FRI SEP 9 2011

AZC012-027-100415-
/O.CON.KPSR.FF.W.0004.000000T0000Z-110910T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LA PAZ AZ-YUMA AZ-
800 PM MST FRI SEP 9 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 PM MST FOR NORTH
CENTRAL YUMA AND WEST CENTRAL LA PAZ COUNTIES...

AT 754 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO 
INDICATE THUNDERSTORMS WITH VERY HEAVY RAIN FROM OVER THE CHOCOLATE 
MOUNTAINS...TO NEAR QUARTZSITE. MOVEMENT WAS SLOWLY EAST.

RADAR INIDATED THAT OVER 4 INCHES OF RAIN HAS FALLEN OVER THE 
CHOCOLATE MOUNTAINS AREA...WITH 2 TO 3 INCHES SOUTH OF QUARTZSITE. 
RUNOFF WILL AFFECT THE GOULD WASH...MOHAVE WASH...AND TYSON WASH 
AREAS. WATER WILL EVENTUALLY DRAIN INTO QUARTZSITE.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO QUARTZSITE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

&&

LAT...LON 3361 11447 3369 11425 3369 11406 3317 11417
      3325 11461

$$

WOODALL

002 
WGUS75 KPSR 100336
FFSPSR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
836 PM MST FRI SEP 9 2011

AZC012-027-100415-
/O.CON.KPSR.FF.W.0004.000000T0000Z-110910T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LA PAZ AZ-YUMA AZ-
836 PM MST FRI SEP 9 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 PM MST FOR NORTH
CENTRAL YUMA AND WEST CENTRAL LA PAZ COUNTIES...

AT 831 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A 
THUNDERSTORM WITH VERY HEAVY RAIN 15 MILES SOUTHEAST OF CIBOLA. 
ANOTHER STORM WITH HEAVY RAIN WAS 20 MILES NORTHEAST OF CIBOLA. 
MOVEMENT WAS EAST AT 15 MPH.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 
QUARTZSITE...AND HIGHWAY 95 SOUTH OF QUARTZSITE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE 
DANGERS OF FLOODING. MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER 
DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. 
FLOOD WATERS ARE USUALLY DEEPER THAN THEY APPEAR. JUST ONE FOOT OF 
FLOWING WATER IS POWERFUL ENOUGH TO SWEEP VEHICLES OFF THE ROAD. 
WHEN ENCOUNTERING FLOODED ROADS MAKE THE SMART CHOICE...TURN 
AROUND...DONT DROWN.

&&

LAT...LON 3361 11447 3369 11425 3369 11406 3317 11417
      3325 11461

$$

WOODALL

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 9, 5:03 PM MST	Special Weather Statement	PSR	Pinal	42 min
Sep 9, 5:08 PM MST	Special Weather Statement	PSR	Yuma	52 min
Sep 9, 5:47 PM MST	Special Weather Statement	PSR	Yuma	43 min
Sep 9, 5:59 PM MST	Areal Flood Advisory	PSR	La Paz	2 hr
Sep 9, 6:22 PM MST	Areal Flood Advisory	PSR	La Paz, Yuma	113 min
Sep 9, 6:38 PM MST	Special Weather Statement	PSR		52 min
Sep 9, 7:03 PM MST	Special Weather Statement	PSR		57 min
Sep 9, 7:09 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	36 min
Sep 9, 7:47 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	28 min
Sep 9, 7:51 PM MST	Special Weather Statement	PSR		39 min
Sep 9, 8:13 PM MST	Special Weather Statement	PSR	Maricopa	47 min
Sep 9, 8:24 PM MST	Areal Flood Advisory	PSR	Maricopa, Yuma	2 hr
Sep 9, 9:16 PM MST	Areal Flood Advisory	PSR	La Paz, Yuma	119 min
Sep 9, 10:37 PM MST	Areal Flood Advisory	PSR	Maricopa, Pinal	113 min
Sep 9, 11:21 PM MST	Special Weather Statement	PSR		39 min
Sep 10, 4:57 PM MST	Special Weather Statement	PSR	Pinal	48 min
Sep 10, 4:59 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	31 min

Nearby

Flash Flood Warnings in Arizona, 2011 Every flash flood warning in 2011

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.