Alert archive / California / Flash Flood Warnings in 2004

Flash Flood Warning 2, NWS Los Angeles, CA

February 2, 2004Los Angeles County, California

NWS Los Angeles, CA issued this flash flood warning at Feb 2, 2004, 7:50 PM PST for Los Angeles County, California. It was in force for 16 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: Feb 2, 2004, 7:50 PM PST (03:50 UTC)
Expired: Feb 3, 2004, 12:00 PM PST
In force: 16 hr
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), 39 km from the middle of the area, began a volume at 03:53 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, 3.8 hours before the alert went out and 159 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2190 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 10 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 030350
FFWLOX
CAC037-030800-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA
750 PM PST MON FEB 2 2004

THE NATIONAL WEATHER SERVICE IN OXNARD HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  THE BURN AREAS OF EASTERN LOS ANGELES COUNTY IN SOUTHWEST          
  CALIFORNIA

* UNTIL 12 MIDNIGHT PST

* AT 745 PM PST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  A LARGE AREA OF MODERATE TO LOCALLY HEAVY RAIN COVERING MOST OF    
  LOS ANGELES COUNTY. THE HEAVIEST RAINFALL WILL AFFECT THE BURN     
  AREAS OF EASTERN LOS ANGELES COUNTY BETWEEN 830 PM AND             
  MIDNIGHT. RAINFALL RATES ARE EXPECTED TO APPROACH ONE HALF INCH    
  PER HOUR...WITH THREE HOUR RAINFALL TOTALS NEAR OR ABOVE ONE INCH. 
  THESE RAINFALL AMOUNTS WILL CAUSE FLASH FLOODING AND MUDSLIDES     
  ACROSS THE BURN AREAS...WITH MUD AND DEBRIS FLOWS POTENTIALLY      
  AFFECTING AREAS IMMEDIATELY DOWNSLOPE OF THE BURN AREAS AS WELL. 

* LOCATIONS LIKELY TO EXPERIENCE FLASH FLOODING INCLUDE CLAREMONT.

RESIDENTS WHO LIVE IN OR BELOW THE RECENTLY BURNED AREAS ARE URGED 
TO TAKE STEPS NECESSARY TO PROTECT THEIR PROPERTY. PERSONS IN THE 
WARNING AREA SHOULD BE READY TO TAKE IMMEDIATE ACTION TO SAVE THEIR 
LIVES OR PROPERTY IF DIRECTED BY EMERGENCY PREPAREDNESS OFFICIALS. 
IF HEAVY FLOWS OF WATER OR MUD ARE OBSERVED...DO NOT WAIT FOR 
OFFICIAL INSTRUCTIONS...EVACUATE IMMEDIATELY.

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

LAT...LON 3413 11778 3411 11769 3422 11766 3422 11769

$$

JACOBSON/GOMBERG

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 2, 5:40 PM PST	Flash Flood Warning	LOX	Los Angeles, Ventura	4 hr

Nearby

Flash Flood Warnings in California, 2004 Every flash flood warning in 2004

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.