Alert archive / California / Flash Flood Warnings in 2011
Flash Flood Warning 3, NWS Los Angeles, CA
NWS Los Angeles, CA issued this flash flood warning at Mar 20, 2011, 5:47 PM PDT for Los Angeles County, California. It was in force for 118 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
- Mar 20, 2011, 5:47 PM PDT (00:47 UTC)
- Expired
- Mar 20, 2011, 7:45 PM PDT
- In force
- 118 min
- Issued by
- NWS Los Angeles, CA
- Area
- Storm-based polygon
- Flood severity
- None
County Los Angeles County, CA
The radar
The Los Angeles radar (KVTX), 60 km from the middle of the area, began a volume at 00:47 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 |
|---|---|---|---|
| Mar 20, 6:14 PM PDT | FLASH FLOOD | 5 S Woodland Hills, CA | MUD AND DEBRIS FLOWING DOWN STREET. AT LEAST FOUR TO FIVE VEHICLES STUCK IN STUCK IN FLOWING WATER. ONE BEING SWEPT AWAY IN FLOOD WATERS. |
| Mar 20, 6:50 PM PDT | FLASH FLOOD | 6 S Woodland Hills, CA | MUDSLIDE AND FLOODING OCCURRING REQUIRING ROAD CLOSURE. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Vandenberg AFB, CA (KVBG), launched 00:00Z, 0.8 hours before the alert went out and 184 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 652 m above ground
- 0-6 km bulk shear
- 73 kt
- 0-1 km storm-relative helicity
- 6 m²/s²
- 0-3 km storm-relative helicity
- 34 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
760
WGUS56 KLOX 210047
FFWLOX
CAC037-210245-
/O.NEW.KLOX.FF.W.0003.110321T0047Z-110321T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE OXNARD CA
547 PM PDT SUN MAR 20 2011
THE NATIONAL WEATHER SERVICE IN OXNARD HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTHWESTERN LOS ANGELES COUNTY IN SOUTHWEST CALIFORNIA...
* UNTIL 745 PM PDT
* AT 536 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
WIDESPREAD HEAVY RAIN ACROSS WESTERN LOS ANGELES COUNTY. A LINE
OF INTENSE SHOWERS EXTENDED FROM MALIBU NORTHWARD TO WOODLAND
HILLS AND CALABASAS. RAINFALL RATES OVER 1 INCH PER HOUR HAVE BEEN
REPORTED AT SEVERAL LOCATIONS IN MALIBU AND THE ADJACENT FOOTHILLS.
THIS RAIN WILL PRODUCE SIGNIFICANT FLASH FLOODING AND FLOODING OF
ROADWAYS IN WESTERN LOS ANGELES COUNTY INCLUDING THE 101 FREEWAY
FROM CALABASAS THROUGH RESEDA AND ON PACIFIC COAST HIGHWAY FROM
MALIBU TO PACIFIC PALISADES. ROCK SLIDES AND MUD SLIDES ARE LIKELY
TO AFFECT PACIFIC COAST HIGHWAY AND CANYON ROADS THROUGH THE SANTA
MONICA MOUNTAINS.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO VAN NUYS...
MALIBU...SANTA MONICA...WOODLAND HILLS AND AGOURA HILLS
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 3400 11849 3403 11856 3403 11867 3402 11870
3403 11875 3401 11878 3416 11880 3417 11867
3424 11867 3425 11863 3430 11864 3433 11853
3424 11842
$$
BRUNO1 follow-up statement
146
WGUS76 KLOX 210151
FFSLOX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE OXNARD CA
651 PM PDT SUN MAR 20 2011
CAC037-210245-
/O.CON.KLOX.FF.W.0003.000000T0000Z-110321T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LOS ANGELES CA-
651 PM PDT SUN MAR 20 2011
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM PDT FOR WEST
CENTRAL LOS ANGELES COUNTY...
AT 642 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE VERY HEAVY RAIN ACROSS WESTERN LOS ANGELES COUNTY. A LINE
OF INTENSE SHOWERS WAS STILL AFFECTING THE AREA FROM MALIBU NORTHWARD
TO WOODLAND HILLS. RAINFALL RATES WERE STILL OVER 1 INCH PER HOUR WITH
THIS LINE. THE TORRENTIAL RAIN WILL PRODUCE SIGNIFICANT FLASH FLOODING
AND FLOODING OF ROADWAYS IN WESTERN LOS ANGELES COUNTY INCLUDING THE
101 FREEWAY FROM CALABASAS THROUGH RESEDA AND PACIFIC COAST HIGHWAY
FROM MALIBU TO PACIFIC PALISADES UNTIL 745 PM PDT. ROCK SLIDES AND
MUD SLIDES ARE LIKELY TO AFFECT PACIFIC COAST HIGHWAY AND CANYON ROADS
THROUGH THE SANTA MONICA MOUNTAINS.
LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MALIBU...
WOODLAND HILLS AND TOPANGA.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.
&&
LAT...LON 3400 11849 3403 11856 3403 11867 3402 11870
3403 11875 3401 11878 3416 11880 3417 11867
3424 11867 3425 11863 3430 11864 3433 11853
3424 11842
$$
BRUNO/ASRThe office that day
Everything else NWS Los Angeles, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 20, 5:51 PM PDT | Areal Flood Advisory | LOX | San Luis Obispo, Santa Barbara | 3 hr |
| Mar 20, 6:05 PM PDT | Areal Flood Advisory | LOX | San Luis Obispo, Santa Barbara | 3 hr |
| Mar 20, 7:33 PM PDT | Flash Flood Warning | LOX | Los Angeles | 87 min |
| Mar 21, 11:00 AM PDT | Special Marine Warning | LOX | 25 min |
Nearby
Flash Flood Warnings in California, 2011Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.