Alert archive / California / Flash Flood Warnings in 2003

Flash Flood Warning 13, NWS Los Angeles, CA

November 12, 2003Los Angeles County, California

NWS Los Angeles, CA issued this flash flood warning at Nov 12, 2003, 4:43 PM PST for Los Angeles County, California. It was in force for 62 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
Nov 12, 2003, 4:43 PM PST (00:43 UTC)
Expired
Nov 12, 2003, 5:45 PM PST
In force
62 min
Issued by
NWS Los Angeles, CA
Area
Counties, with a storm outline in the text

County Los Angeles County, CA

The radar

The Santa Ana Mts radar (KSOX), 37 km from the middle of the area, began a volume at 00:44 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

San Diego, CA (KNKX), launched 00:00Z, 0.7 hours before the alert went out and 152 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-pSkew-T log-p diagram, San Diego, CA at 00:00Z on 2003-11-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 352 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, San Diego, CA at 00:00Z on 2003-11-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -2 square meters per square second.1939587897117136Sfc1 km3 km6 km9 kmRMLM
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
352 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
659 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
-2 m²/s²
0-3 km storm-relative helicity
57 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.

000 
WGUS56 KLOX 130042
FFWLOX
CAC037-130145-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA
443 PM PST WED NOV 12 2003

THE NATIONAL WEATHER SERVICE IN OXNARD HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN AND EASTERN LOS ANGELES COUNTY IN SOUTHWEST CALIFORNIA

* UNTIL 545 PM PST

* AT 440 PM PST...WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY 
  RAIN ASSOCIATED WITH STRONG THUNDERSTORMS. 

* LOCATIONS LIKELY TO EXPERIENCE FLASH FLOODING INCLUDE COMPTON...
  DIAMOND BAR...DOWNEY...EAST LOS ANGELES...EL MONTE...HAWTHORNE...
  HUNTINGTON PARK...INGLEWOOD...LA PUENTE...DOWNTOWN LOS ANGELES...
  LYNWOOD...MONTEBELLO...MONTEREY PARK...NORWALK...POMONA...ROWLAND
  HEIGHTS...SOUTH SAN JOSE HILLS...TORRANCE...WALNUT...WEST COVINA   
  AND WHITTIER.

FLOOD WATERS CAN EASILY SWEEP MOTOR VEHICLES DOWNSTREAM EVEN IF THEY
ARE FLOWING SLOWLY. IF YOUR MOTOR VEHICLE IS OVERTAKEN BY FLOOD
WATERS...ABANDON IT AND MOVE TO HIGHER GROUND ON FOOT.

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

LAT...LON 3411 11769 3390 11775 3382 11836 3406 11838

The office that day

Everything else NWS Los Angeles, CA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Nov 12, 5:45 PM PSTFlash Flood WarningLOXLos Angeles105 min
Nov 12, 7:30 PM PSTFlash Flood WarningLOXLos Angeles2 hr
Nov 12, 9:30 PM PSTFlash Flood WarningLOXLos Angeles60 min

Nearby

Flash Flood Warnings in California, 2003Every flash flood warning in 2003

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.