Alert archive / California / Flash Flood Warnings in 2012
Flash Flood Warning 6, NWS Los Angeles, CA
NWS Los Angeles, CA issued this flash flood warning at Oct 11, 2012, 2:55 PM PDT for Los Angeles County, California. It was in force for 98 min. 2 reports 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
- Oct 11, 2012, 2:55 PM PDT (21:55 UTC)
- Expired
- Oct 11, 2012, 4:33 PM PDT
- In force
- 98 min
- Issued by
- NWS Los Angeles, CA
- Area
- Storm-based polygon
- Flood severity
- None
County Los Angeles County, CA
The radar
The Santa Ana Mts radar (KSOX), 58 km from the middle of the area, began a volume at 21:57 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 |
|---|---|---|---|
| Oct 11, 2:58 PM PDT | HEAVY RAIN 1.1 | 2 Nw Pasadena, CA | 1.10 INCHES OF RAINFALL IN 25 MINUTES AT DEVILS GATE AUTOMATED RAIN GAUGE. |
| Oct 11, 3:30 PM PDT | FLASH FLOOD | 4 Nw Pasadena, CA | FLASH FLOOD AND MUD FLOWS REPORTED IN LA CANADA. CROWN STREET WAS CLOSED BETWEEN FOOTHILL AVE AND BAPTISTE ST. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
San Diego, CA (KNKX), launched 12:00Z, 9.9 hours before the alert went out and 176 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
- 64 J/kg
- Mixed-layer CIN
- -36 J/kg
- Mixed-layer LCL
- 719 m above ground
- 0-6 km bulk shear
- 75 kt
- 0-1 km storm-relative helicity
- 39 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
863
WGUS56 KLOX 112155
FFWLOX
CAC037-112345-
/O.NEW.KLOX.FF.W.0006.121011T2155Z-121011T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE OXNARD CA
255 PM PDT THU OCT 11 2012
THE NATIONAL WEATHER SERVICE IN OXNARD HAS ISSUED A
* FLASH FLOOD WARNING FOR...
CENTRAL LOS ANGELES COUNTY IN SOUTHWEST CALIFORNIA...
THIS INCLUDES THE CITIES OF...TUJUNGA...SUNLAND...SIERRA MADRE...
LAKE VIEW TERRACE...LA CRESCENTA...LA CANADA/FLINTRIDGE...MONTEREY
PARK...
* UNTIL 445 PM PDT
* AT 245 PM PDT...DOPPLER RADAR INDICATED STRONG AND NEARLY STATIONARY
THUNDERSTORMS PRODUCING RAINFALL RATES IN EXCESS OF ONE INCH PER
HOUR ACROSS THE SAN GABRIEL MOUNTAINS AND FOOTHILLS. FLASH
FLOODING IS LIKELY ACROSS THE WARNING AREA. PEOPLE IN LOCATIONS
NEAR THE STATION FIRE BURN AREA SHOULD BE ESPECIALLY ALERT FOR
FLOODING AND DEBRIS FLOWS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.
&&
LAT...LON 3428 11789 3413 11778 3394 11815 3430 11840
3439 11815
$$
GOMBERG/KJ3 follow-up statements
745
WGUS76 KLOX 112213
FFSLOX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE OXNARD CA
313 PM PDT THU OCT 11 2012
CAC037-112345-
/O.CON.KLOX.FF.W.0006.000000T0000Z-121011T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LOS ANGELES CA-
313 PM PDT THU OCT 11 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 PM PDT FOR
CENTRAL LOS ANGELES COUNTY...INCLUDING THE CITIES OF
LA CANADA FLINTRIDGE...ALTADENA...AND PASADENA...
AT 300 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A CLUSTER OF STRONG THUNDERSTORMS OVER CENTRAL LOS ANGELES
COUNTY...CAPABLE OF PRODUCING FLASH FLOODING. THE STRONGEST STORM
WAS LOCATED OVER THE CITIES OF LA CANADA
FLINTRIDGE...ALTADENA...MONTROSE...AND PASADENA...IMPACTING HIGHWAYS
2 AND 210. THIS STORM WAS ALSO IMPACTING THE STATION FIRE BURN
AREA...WHERE THERE IS STILL THE POTENTIAL FOR DEBRIS FLOWS.
VERY HEAVY RAIN HAS BEEN REPORTED WITH THESE STORMS...WITH DOPPLER
RADAR ESTIMATING RAINFALL RATES OVER 1.5 INCHES PER HOUR. AN
AUTOMATED GAUGE AT DEVILS GATE DAM REPORTED 1.22 INCHES OF RAIN
BETWEEN 230 PM AND 3 PM.
IN ADDITION TO VERY HEAVY RAINFALL...THESE THUNDERSTORMS ARE
PRODUCING SMALL HAIL AND FREQUENT LIGHTNING.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.
&&
LAT...LON 3428 11789 3413 11778 3394 11815 3430 11840
3439 11815
$$
GOMBERG791 WGUS76 KLOX 112326 FFSLOX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE OXNARD CA 426 PM PDT THU OCT 11 2012 CAC037-112345- /O.CON.KLOX.FF.W.0006.000000T0000Z-121011T2345Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ LOS ANGELES CA- 426 PM PDT THU OCT 11 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 PM PDT FOR CENTRAL LOS ANGELES COUNTY... AT 415 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A CLUSTER OF STRONG THUNDERSTORMS OVER CENTRAL LOS ANGELES COUNTY...CAPABLE OF PRODUCING VERY HEAVY RAIN AND FLASH FLOODING. THE STRONGEST STORMS WERE CURRENTLY LOCATED OVER EAST LOS ANGELES AND THE SAN GABRIEL VALLEY...IMPACTING THE CITIES OF ALHAMBRA... MONTEREY PARK...MONTEBELLO...EL MONTE...AND ROSEMEAD. DOPPLER RADAR HAS ESTIMATED RAINFALL RATES BETWEEN 1 AND 2 INCHES PER HOUR ACROSS THESE AREAS. MAJOR ROADWAYS IMPACTED BY THESE VERY HEAVY RAINS AND FLOODING INCLUDE HIGHWAYS 60 AND 101...AS WELL AS INTERSTATES 10...605...AND 710. BETWEEN 315 PM AND 415...AN AUTOMATED RAIN GAUGE AT FREMONT HEADQUARTERS IN EAST LOS ANGELES REPORTED 1.34 INCHES OF RAIN...WHILE EATON WASH REPORTED 1.10 INCHES. LAT...LON 3428 11789 3413 11778 3394 11815 3430 11840 3439 11815 $$ GOMBERG
282 WGUS76 KLOX 112333 FFSLOX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE OXNARD CA 433 PM PDT THU OCT 11 2012 CAC037-112341- /O.CAN.KLOX.FF.W.0006.000000T0000Z-121011T2345Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ LOS ANGELES CA- 433 PM PDT THU OCT 11 2012 ...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL LOS ANGELES COUNTY... THE FLASH FLOOD WARNING HAS BEEN CANCELLED BUT WILL BE REPLACED SHORTLY WITH ANOTHER FLASH FLOOD WARNING THAT WILL BE EXPANDED. LAT...LON 3428 11789 3413 11778 3394 11815 3430 11840 $$ KAPLAN
The office that day
Everything else NWS Los Angeles, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 11, 4:02 AM PDT | Special Marine Warning | LOX | 28 min | |
| Oct 11, 4:09 AM PDT | Special Weather Statement | LOX | Los Angeles | 51 min |
| Oct 11, 5:41 AM PDT | Special Marine Warning | LOX | 49 min | |
| Oct 11, 6:26 AM PDT | Special Marine Warning | LOX | 34 min | |
| Oct 11, 6:31 AM PDT | Special Weather Statement | LOX | Los Angeles | 44 min |
| Oct 11, 6:32 AM PDT | Special Weather Statement | LOX | Los Angeles | 43 min |
| Oct 11, 8:32 AM PDT | Special Marine Warning | LOX | 58 min | |
| Oct 11, 8:50 AM PDT | Special Marine Warning | LOX | 55 min | |
| Oct 11, 10:00 AM PDT | Special Marine Warning | LOX | 60 min | |
| Oct 11, 12:39 PM PDT | Areal Flood Advisory | LOX | Los Angeles | 111 min |
| Oct 11, 12:54 PM PDT | Areal Flood Advisory | LOX | 111 min | |
| Oct 11, 1:02 PM PDT | Flash Flood Warning | LOX | Ventura | 3 hr |
| Oct 11, 1:35 PM PDT | Areal Flood Advisory | LOX | Los Angeles | 115 min |
| Oct 11, 1:51 PM PDT | Areal Flood Advisory | LOX | Santa Barbara | 114 min |
| Oct 11, 2:47 PM PDT | Special Weather Statement | LOX | Los Angeles | 28 min |
| Oct 11, 3:29 PM PDT | Special Weather Statement | LOX | Los Angeles | 31 min |
| Oct 11, 3:35 PM PDT | Areal Flood Advisory | LOX | Los Angeles | 115 min |
| Oct 11, 4:37 PM PDT | Flash Flood Warning | LOX | Los Angeles | 113 min |
| Oct 11, 4:46 PM PDT | Special Marine Warning | LOX | 29 min | |
| Oct 11, 4:54 PM PDT | Special Weather Statement | LOX | Orange | 51 min |
Nearby
Flash Flood Warnings in California, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.