Alert archive / California / Flash Flood Warnings in 2008

Flash Flood Warning 15, NWS Los Angeles, CA

January 25, 2008Los Angeles County, Ventura County, California

NWS Los Angeles, CA issued this flash flood warning at Jan 25, 2008, 7:30 AM PST for Los Angeles County, Ventura County, California. It was in force for 90 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jan 25, 2008, 7:30 AM PST (15:30 UTC)
Expired: Jan 25, 2008, 9:00 AM PST
In force: 90 min
Issued by: NWS Los Angeles, CA
Area: Storm-based polygon
Flood severity: None

Counties Los Angeles County, CA, Ventura County, CA

The radar

The Los Angeles radar (KVTX), 47 km from the middle of the area, began a volume at 15:33 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 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.

NWS Los Angeles, CA wrote its last area forecast discussion before this flash flood warning went out at Jan 25, 4:20 AM PST, 3 hours 10 minutes earlier.

Area forecast discussion, Jan 25, 4:20 AM PST, 3 hours 10 minutes before

SOUTHWEST CALIFORNIA AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA
420 AM PST FRI JAN 25 2008

.SHORT TERM...
THINGS NOT GOING AS PLANNED. A BAND OF RAIN WITH HEAVY SHOWERS AND
ISOLATED THUNDERSTORM IS SITTING OVER L.A. COUNTY INSTEAD OF MOVING
OUT OF THE AREA AS 18 AND 00Z MDLS SUGGESTED. SATELLITE SHOWS
SHOWERS FORMING IN THE SOUTHERN WATERS WITH A TRAJECTORY FOR VTA AND
SOUTHERN SBA COUNTY. SATELLITE SHOWS A LARGE CLOUD COMMA MOVING INTO
THE CENTRAL COAST. THE MDLS ARE MUCH TOO DRY AND FORECAST IS WETTER.
THE SFO GRAD IS NEAR 10 MB AND 950 MB FLOW PEAKS NEAR 65 KT THE
MOUNTAINS WILL SEE HIGH WIND WARNING WINDS ALTHOUGH WITH SBA VTA AND
LA MTNS THE WINDS WILL BE INCORPORATED INTO THE WINTER STORM
WARNING. SNOW LEVELS STILL LOW AROUND 3000 FEET AND WILL RISE TO
4000 FEET THROUGH THE DAY. ANOTHER 6 TO 12 INCHES OF SNOW WILL BE
POSSIBLE IN THE MOUNTAINS.

THE BIG QUESTION MARK FOR TODAY IS VENTURA AND THE SANTA BARBARA
SOUTH COAST WHICH...IF THE SHOWERS DO NOT DEVELOP AS EXPECTED...
TODAY COULD BE MUCH DRIER THAT CURRENT FORECAST INDICATES. WILL HAVE
TO WATCH THIS.

THINGS ARE STILL ON TRACK FOR A LULL STARTING LATE THIS AFTERNOON AS
THE UPPER LOW PULLS UP TO THE NORTHWEST. THIS WILL PULL THINGS UP
AND AWAY FROM THE AREA AND THERE WILL ONLY BE A SLIGHT CHANCE OR A
CHANCE OF RAIN FOR THE AREA AND SOME SUNSHINE COULD PEAK THROUGH AT
TIMES.

BUT THEN THE INTERESTING THING HAPPENS. THE UPPER LOW PLUNGES SOUTH
DOWN THE 130 LONGITUDE LINE THIS ALTERS THE FLOW PATTERN TO A DEEP
SOUTHERLY FLOW WHICH PICKS UP A SUB TROPICAL PLUME AND MOVES IT INTO
SOUTHERN CALIFORNIA WHICH WILL SET UP A GOOD OROGRAPHIC SITUATION.
THE EXACT AXIS OF THE PLUME WILL DETERMINE HOW MUCH RAIN FALLS.
CURRENT MDLS CALL FOR 1-3 INCHES COAST VLYS AND 3 TO 5 MTNS WITH
LOCALLY HIGHER AMOUNTS ON THE SOUTH SLOPES. THE FINAL TALLY COULD BE
HALF OF THAT OR NEAR DOUBLE THAT DEPENDING ON HOW THE PLUME ARRIVES.
REALLY CANNOT COUNT ON THE MDLS AS THEY ARE CONSISTENTLY HORRIBLE AT
THIS KIND OF FORECAST.

DUE TO THE SUB TROPICAL NATURE OF THE SAT AND SUN SYSTEM SNOW LEVELS
WILL RISE TO NEAR 6000 FEET. IT WILL BE BREEZY TOO AS 1002 MB
SURFACE LOW SETS UP WEST OF POINT CONCEPTION.

.LONG TERM...
GFS AND EC HAVE COME INTO BETTER AGREEMENT FOR THE MONDAY TO
THURSDAY PERIOD.

THE UPPER LOW SHOULD QUICKLY SWEEP OUT LATER SUNDAY. SHOWERS WILL
STEADILY DIMINISH SUNDAY NIGHT INTO MONDAY IN THE COLD UNSTABLE AIR
IN THE ARRIVING NW FLOW. TUESDAY WILL BE THE FIRST NICE DAY IN
WHILE. A QUICK MOVING SYSTEM WILL MOVE THROUGH THE AREA WEDNESDAY
AND THEN A QUICK RIDGE BUILDS IN THURSDAY.

&&

.AVIATION...

25/1200Z...

VFR CONDS THROUGH THE CENTRAL COAST WITH OCCASIONAL MVFR IN
SCATTERED SHOWERS. S OF POINT CONCEPTION...MVFR CONDS WILL MAKE WAY
TO MOSTLY VFR BY LATE AFTERNOON AS SHOWER ACTIVITY WANES. SLIGHT
CHANCE OF TSRA THROUGH ABOUT 18Z FROM KOXR SOUTH. GUSTY SE WINDS
WILL AFFECT MOST AIRFIELDS AT TIMES THRU THE DAY...WITH MODERATE
LLWS AND UDDS POSSIBLE...STRONGEST BETWEEN 18Z AND 22Z.

FOR KLAX AND KBUR...SHOWERS EXPECTED TO CONTINUE THROUGH THE
MORNING...AND TAPER OFF QUICKLY THROUGH THE AFTERNOON. MVFR TO VFR
SKIES EXPECTED THROUGH THE PERIOD...LEANING MORE TOWARDS VFR LATE IN
THE DAY. ISOLATED TSRA STILL POSSIBLE THROUGH 18Z. GUSTY SE WINDS TO
25 KT WILL BE POSSIBLE EARLY FRI AFTERNOON.

.LOX WATCHES/WARNINGS/ADVISORIES...
WINTER STORM WARNING (SEE LAXWSWLOX).
HIGH WIND WARNING (SEE LAXNPWLOX).
FLOOD WATCH (SEE LAXFFALOX).
WIND ADVISORY (SEE LAXNPWLOX).
SNOW ADVISORY (SEE LAXWSWLOX).
STORM WARNING (SEE LAXCWFLOX).
GALE WARNING (SEE LAXCWFLOX).
SMALL CRAFT ADVISORY (SEE LAXCWFLOX).
MARINE WEATHER STATEMENT (SEE LAXMWSLOX).
SPECIAL WEATHER STATEMENT (SEE LAXSPSLOX).

&&

PUBLIC...RORKE
AVIATION...MEIER

WWW.WEATHER.GOV/LOSANGELES

Hazardous weather outlook, Jan 25, 6:00 AM PST, 1 hour 30 minutes before

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In the hours before

Local storm report, Jan 25, 1:54 AM PST, 5 hours 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OXNARD CA
154 AM PST FRI JAN 25 2008

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0125 AM     FLASH FLOOD      3 NNE HOLLYWOOD         34.14N 118.31W
01/25/2008                   LOS ANGELES        CA   PARK/FOREST SRVC

            DEBRIS FLOW OCCURRED ON E. OBSERVATORY RD. IN THE
            GRIFFITH PARK BURN AREA.

&&

KAPLAN

Special weather statement, Jan 25, 4:30 AM PST, 3 hours before

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    <section class="card" role="status" aria-live="polite">
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      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 24, 4:15 PM PST	Snow and Blowing Snow Advisory	LOX		18 hr
Jan 24, 5:44 PM PST	Wind Advisory	LOX	Los Angeles, Santa Barbara	4 days
Jan 24, 5:47 PM PST	Special Marine Warning	LOX		43 min
Jan 24, 6:13 PM PST	Special Marine Warning	LOX		32 min
Jan 24, 6:41 PM PST	Special Marine Warning	LOX		49 min
Jan 24, 7:55 PM PST	Special Marine Warning	LOX		2 hr
Jan 24, 8:04 PM PST	Flash Flood Warning	LOX	Los Angeles	56 min
Jan 24, 8:43 PM PST	Tornado Warning	LOX	Los Angeles	62 min
Jan 24, 8:55 PM PST	Tornado Warning	LOX	Los Angeles	65 min
Jan 24, 9:52 PM PST	Special Marine Warning	LOX		95 min
Jan 24, 9:53 PM PST	Flash Flood Warning	LOX	Los Angeles	2 hr
Jan 25, 1:11 AM PST	Flash Flood Warning	LOX	Los Angeles	94 min
Jan 25, 2:05 AM PST	High Wind Warning	LOX	Santa Barbara	56 hr
Jan 25, 4:23 AM PST	Flash Flood Warning	LOX	Los Angeles	97 min
Jan 25, 5:28 AM PST	Special Marine Warning	LOX		2 hr
Jan 25, 5:56 AM PST	Flash Flood Warning	LOX	Los Angeles	94 min

Nearby

Flash Flood Warnings in California, 2008 Every flash flood warning in 2008

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.