Alert archive / California / Flash Flood Warnings in 2003

Flash Flood Warning 12, NWS Los Angeles, CA

November 12, 2003Los Angeles County, California

NWS Los Angeles, CA issued this flash flood warning at Nov 12, 2003, 3:42 PM PST for Los Angeles County, California. It was in force for 63 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, 3:42 PM PST (23:42 UTC)
Expired: Nov 12, 2003, 4:45 PM PST
In force: 63 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), 48 km from the middle of the area, began a volume at 23:42 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS56 KLOX 122345
FFWLOX
CAC037-130045-

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

THE NATIONAL WEATHER SERVICE IN OXNARD HAS ISSUED A

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

* UNTIL 445 PM PST

* AT 336 PM PST...WEATHER SERVICE DOPPLER RADAR INDICATED VERY       
  HEAVY RAIN ASSOCIATED WITH STRONG THUNDERSTORMS.

* LOCATIONS LIKELY TO EXPERIENCE FLASH FLOODING INCLUDE ALHAMBRA...
  COMPTON...DOWNEY...EAST LOS ANGELES...EL MONTE...HUNTINGTON PARK...
  INGLEWOOD...LA PUENTE...LYNWOOD...MONTEBELLO...MONTEREY            
  PARK...SOUTH SAN JOSE HILLS...WEST COVINA AND WHITTIER.

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 11793 3396 11789 3385 11834 3404 11837
          3412 11807

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

Hazardous weather outlook, Nov 12, 8:15 AM PST, 7 hours 27 minutes before

CAZ034>041-044>047-051>054-059-087-088-130200-

HAZARDOUS WEATHER OUTLOOK...CORRECTION
NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA
815 AM PST WED NOV 12 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHWESTERN CALIFORNIA.

.DAY ONE...TODAY

NUMEROUS SHOWERS AND THUNDERSTORMS WILL OCCUR TODAY. THERE IS A
STRONG POTENTIAL FOR FLASH FLOODING IN THE BURN AREAS DUE TO THE
HIGH RAINFALL RATES ASSOCIATED WITH THUNDERSTORMS. A FLASH FLOOD
WATCH HAS BEEN ISSUED FOR THE BURN AREAS.

DANGEROUS LIGHTNING AND SMALL HAIL WILL BE POSSIBLE TODAY ANYWHERE
AND AT ANY TIME.

THE THUNDERSTORMS AND SHOWERS WILL DIMINISH OVERNIGHT.

THE SNOW LEVEL WILL LOWER TO BETWEEN 5000 AND 5500 FEET BY LATE THIS
AFTERNOON. SNOW WILL FALL THROUGH THE NIGHT. THE GREATEST
ACCUMULATIONS WILL BE OVER THE NORTHERN MOUNTAINS. 4 TO 8 INCHES OF
SNOW IS FORECAST OVER THE NORTHERN MOUNTAINS WHILE 2 TO 4 INCHES IS
FORECAST ELSEWHERE IN THE MOUNTAINS.

MOUNTAIN WINDS WILL BLOW FROM THE EAST TODAY FROM 20 TO 30 MPH WITH
GUSTS TO 40 MPH.

* FLOOD WATCH................SEE WGUS66 KLOX - FFALOX FOR DETAILS *

* WINTER WEATHER ADVISORY....SEE WWUS46 KLOX - WSWLOX FOR DETAILS *

.DAYS TWO THROUGH SEVEN... THURSDAY THROUGH TUESDAY

SNOW SHOWERS OVER THE MOUNTAINS WILL LINGER THROUGH THURSDAY
MORNING...OTHERWISE HAZARDOUS WEATHER IS NOT EXPECTED DURING THE
PERIOD.

* WINTER WEATHER ADVISORY....SEE WWUS46 KLOX - WSWLOX FOR DETAILS *

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

RORKE/SWEET

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 12, 12:15 AM PST	Flash Flood Warning	LOX	Ventura	2 hr
Nov 12, 5:27 AM PST	Flash Flood Warning	LOX	Los Angeles	2 hr

Nearby

Flash Flood Warnings in California, 2003 Every 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; radar from the NEXRAD Level II archive.