Alert archive / California / Flash Flood Warnings in 2003
Flash Flood Warning 14, NWS Los Angeles, CA
NWS Los Angeles, CA issued this flash flood warning at Nov 12, 2003, 5:45 PM PST for Los Angeles County, California. It was in force for 105 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, 5:45 PM PST (01:45 UTC)
- Expired
- Nov 12, 2003, 7:30 PM PST
- In force
- 105 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), 41 km from the middle of the area, began a volume at 01:46 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 nearest sounding before it
San Diego, CA (KNKX), launched 00:00Z, 1.8 hours before the alert went out and 160 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
- 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
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS56 KLOX 130144 FFWLOX CAC037-130330- BULLETIN - IMMEDIATE BROADCAST REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA 545 PM PST WED NOV 12 2003 THE NATIONAL WEATHER SERVICE IN OXNARD HAS EXTENDED THE * FLASH FLOOD WARNING FOR... SOUTHERN AND EASTERN LOS ANGELES COUNTY IN SOUTHWEST CALIFORNIA...INCLUDING THE PADUA BURN AREA * UNTIL 730 PM PST * AT 525 PM PST...WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN ASSOCIATED WITH STRONG THUNDERSTORMS EXTENDING FROM NEAR THE I-110 AND I-105 INTERSECTION IN SOUTH CENTRAL LOS ANGELES TO THE FOOTHILLS OF THE SAN GABRIEL VALLEY. RAINFALL RATES FROM AUTOMATED RAIN GAGES CONTINUE TO BE NEAR 2.5 INCHES PER HOUR BETWEEN COMPTON AND INGLEWOOD. RAINFALL RATES IN THE EASTERN SAN GABRIEL VALLEY WERE NEAR ONE INCH PER HOUR. * 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. EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS. AREAS NEAR THE PADUA BURN AREA CAN EXPECT THE DANGER OF MUDSLIDES AND DEBRIS FLOW. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO HIGHER GROUND. TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN OXNARD. LAT...LON 3422 11766 3396 11775 3389 11835 3422 11820 $$ MOYER
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, 9 hours 30 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, 4:43 PM PST | Flash Flood Warning | LOX | Los Angeles | 62 min |
| Nov 12, 7:30 PM PST | Flash Flood Warning | LOX | Los Angeles | 2 hr |
| Nov 12, 9:30 PM PST | Flash Flood Warning | LOX | Los Angeles | 60 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.