Alert archive / Arizona / Flash Flood Warnings in 2012
Flash Flood Warning 77, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Sep 11, 2012, 1:18 AM MST for La Paz County, Arizona. It was in force for 3 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
- Sep 11, 2012, 1:18 AM MST (08:18 UTC)
- Expired
- Sep 11, 2012, 4:15 AM MST
- In force
- 3 hr
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Flood severity
- None
County La Paz County, AZ
The radar
The Yuma radar (KYUX), 173 km from the middle of the area, began a volume at 08:20 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, 8.3 hours before the alert went out and 147 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.
- Mixed-layer CAPE
- 179 J/kg
- Mixed-layer CIN
- -69 J/kg
- Mixed-layer LCL
- 2111 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- -13 m²/s²
- 0-3 km storm-relative helicity
- 27 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
399
WGUS55 KPSR 110818
FFWPSR
AZC012-111115-
/O.NEW.KPSR.FF.W.0077.120911T0818Z-120911T1115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
118 AM MST TUE SEP 11 2012
THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A
* FLASH FLOOD WARNING FOR...
EAST CENTRAL LA PAZ COUNTY IN WEST CENTRAL ARIZONA...
* UNTIL 415 AM MST
* AT 112 AM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED
VERY HEAVY RAIN THAT WILL CAUSE FLASH FLOODING. STREAM GAGES ALONG
THE CENTENNIAL WASH IN WENDEN INDICATE WATER HAS RISEN TO A DEPTH OF
NEARLY 3 FEET AND WITH ADDITIONAL RAINFALL EXPECTED...THE WATER
LEVEL WILL CONTINUE TO RISE AND CAUSE FLOODING IN AND NEAR WENDEN.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
WENDEN...SALOME
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A FLASH FLOOD WARNING MEANS THAT PEOPLE ALONG THE BANKS OF WASHES AND
CREEKS SHOULD MOVE TO HIGHER GROUND IMMEDIATELY. NORMALLY DRY WASHES
AND STREAMS WILL SUDDENLY HAVE RUNNING WATER AND MAKE UNBRIDGED
CROSSINGS IMPASSABLE. STREETS...UNDERPASSES...AND LOW SPOTS WILL
BECOME INUNDATED MAKING DRIVING HAZARDOUS IN THE WARNED AREA.
&&
LAT...LON 3360 11361 3380 11365 3393 11338 3385 11340
3357 11345
$$
LEINS2 follow-up statements
065
WGUS75 KPSR 110923
FFSPSR
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
223 AM MST TUE SEP 11 2012
AZC012-111115-
/O.CON.KPSR.FF.W.0077.000000T0000Z-120911T1115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LA PAZ AZ-
223 AM MST TUE SEP 11 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 AM MST FOR EAST
CENTRAL LA PAZ COUNTY...
AT 218 AM MST...RAINFALL WAS ENDING ACROSS LA PAZ COUNTY.
HOWEVER...STREAM GAGES CONTINUE TO INDICATE ELEVATED FLOW AROUND 3
FEET DEEP IN THE CENTENNIAL WASH NEAR WENDEN. THE FLOW IS EXPECTED
TO CONTINUE UNTIL AT LEAST 4 AM BEFORE GRADUALLY RECEDING. LOW LYING
AREAS NEAR CENTENNIAL WASH WILL LIKELY SEE FLOODING BEFORE THEN.
LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WENDEN AND
SALOME
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A FLASH FLOOD WARNING MEANS THAT PEOPLE ALONG THE BANKS OF WASHES AND
CREEKS SHOULD MOVE TO HIGHER GROUND IMMEDIATELY. NORMALLY DRY WASHES
AND STREAMS WILL SUDDENLY HAVE RUNNING WATER AND MAKE UNBRIDGED
CROSSINGS IMPASSABLE. STREETS...UNDERPASSES...AND LOW SPOTS WILL
BECOME INUNDATED MAKING DRIVING HAZARDOUS IN THE WARNED AREA.
&&
LAT...LON 3360 11361 3380 11365 3393 11338 3385 11340
3357 11345
$$
LEINS146
WGUS75 KPSR 111108
FFSPSR
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
408 AM MST TUE SEP 11 2012
AZC012-111117-
/O.EXP.KPSR.FF.W.0077.000000T0000Z-120911T1115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LA PAZ AZ-
408 AM MST TUE SEP 11 2012
...THE FLASH FLOOD WARNING WILL EXPIRE AT 415 AM MST FOR EAST CENTRAL
LA PAZ COUNTY...
RUNOFF FROM PREVIOUS STORMS WILL CONTINUE THIS MORNING...BUT THE
THREAT FOR FLASH FLOODING HAS ENDED. CONTINUE TO USE CAUTION IF
TRAVELING THIS MORNING AND YOU ENCOUNTER FLOODED AREAS. DO NOT CROSS
FLOODED ROADWAYS.
LAT...LON 3360 11361 3380 11365 3393 11338 3385 11340
3357 11345
$$
LEINSThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 10, 6:38 PM MST | Special Weather Statement | PSR | 52 min | |
| Sep 10, 7:34 PM MST | Areal Flood Advisory | PSR | Maricopa, Pinal | 116 min |
| Sep 10, 8:33 PM MST | Areal Flood Advisory | PSR | Maricopa | 117 min |
| Sep 10, 9:26 PM MST | Flash Flood Warning | PSR | Maricopa | 79 min |
| Sep 10, 9:59 PM MST | Areal Flood Advisory | PSR | Maricopa, Pinal | 2 hr |
| Sep 10, 10:14 PM MST | Areal Flood Advisory | PSR | Maricopa, Pinal | 2 hr |
| Sep 10, 10:45 PM MST | Flash Flood Warning | PSR | Maricopa | 60 min |
| Sep 10, 11:03 PM MST | Areal Flood Advisory | PSR | Maricopa | 117 min |
| Sep 10, 11:12 PM MST | Areal Flood Advisory | PSR | La Paz, Yuma | 5 hr |
| Sep 10, 11:25 PM MST | Flash Flood Warning | PSR | Maricopa | 110 min |
| Sep 11, 1:05 AM MST | Areal Flood Advisory | PSR | Maricopa | 3 hr |
| Sep 11, 3:42 AM MST | Flash Flood Watch | PSR | 11 hr |
Nearby
Flash Flood Warnings in Arizona, 2012Every 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.