Alert archive / California / Flash Flood Warnings in 2004

Flash Flood Warning 95, NWS San Diego, CA

December 29, 2004San Diego County, California

NWS San Diego, CA issued this flash flood warning at Dec 29, 2004, 5:45 AM PST for San Diego County, California. It was in force for 2 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
Dec 29, 2004, 5:45 AM PST (13:45 UTC)
Expired
Dec 29, 2004, 8:00 AM PST
In force
2 hr
Issued by
NWS San Diego, CA
Area
Counties, with a storm outline in the text

County San Diego County, CA

The radar

The San Diego radar (KNKX), 24 km from the middle of the area, began a volume at 13:46 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 12:00Z, 1.8 hours before the alert went out and 42 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 12:00Z on 2004-12-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, San Diego, CA at 12:00Z on 2004-12-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -137 square meters per square second.1939587897117136156Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
569 m above ground
0-6 km bulk shear
70 kt
0-1 km storm-relative helicity
-137 m²/s²
0-3 km storm-relative helicity
17 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 KSGX 291346
FFWSGX
CAC073-291600-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
545 AM PST WED DEC 29 2004

THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  CENTRAL SAN DIEGO COUNTY IN SOUTHWEST CALIFORNIA
  THIS INCLUDES THE CITIES OF...SPRING VALLEY...SANTEE...POWAY...
  LEMON GROVE...LAKESIDE...LA MESA...ESCONDIDO...EL CAJON...CHULA   
  VISTA AND THE BURN AREAS OF THE SAN DIEGO MOUNTAINS.  

* UNTIL 800 AM PST

* AT 540 AM PST...LOCAL FLASH FLOODING WAS OCCURRING OVER THE BURN 
AREAS. 

* BANDS OF MODERATE TO HEAVY RAIN WILL CONTINUE TO MOVE EAST OVER 
THE AREA THROUGH 8 AM BRINGING THE LIKELIHOOD OF FLASH FLOODING AND 
MUD SLIDES TO THE BURN AREAS. 

MUD SLIDES AND ROCK SLIDES CAN POTENTIALLY TRAP AND KILL PEOPLE 
CAUGHT IN THEIR PATH.

RESIDENTS AND MOTORISTS IN AND BELOW RECENTLY BURNED AREAS SHOULD BE
ALERT TO HEAVY MUD AND DEBRIS FLOWS WHICH MAY BLOCK ROADS AND
CULVERTS. POTENTIALLY DANGEROUS FLOODING AND PROPERTY LOSS COULD
RESULT IN AREAS WHERE RUNOFF IS RESTRICTED OR BLOCKED.

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. MOVE TO HIGHER GROUND.

LAT...LON 3268 11685 3274 11660 3332 11658 3331 11705

$$

JAD

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 San Diego, CA wrote its last area forecast discussion before this flash flood warning went out at Dec 29, 2:30 AM PST, 3 hours 15 minutes earlier.

Area forecast discussion, Dec 29, 2:30 AM PST, 3 hours 15 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
230 AM PST WED DEC 29 2004

.SYNOPSIS...A COLD PACIFIC STORM WITH STRONG WINDS AND PERIODS OF
RAIN...HEAVY AT TIMES...WILL GRADUALLY MOVE THROUGH THE AREA TODAY.
SNOW WILL OCCUR AT THE HIGHEST ELEVATIONS. SOME THUNDERSTORMS WILL
ALSO OCCUR. NUMEROUS WATCHES...WARNINGS AND ADVISORIES REMAIN IN
EFFECT. THE WINDS SHOULD GRADUALLY DECREASE TODAY...WITH THE RAIN
WINDING DOWN OVERNIGHT. COOL AND UNSETTLED WEATHER WILL CONTINUE
WITH A CHANCE OF MORE SHOWERS THROUGH THE END OF THE WEEK.

&&

.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES.

VERY STRONG WINDS WITH GUSTS TO AROUND 60 MPH MOVED THROUGH MOST
AREAS OVERNIGHT. LOTS OF TREE DAMAGE REPORTED. A WIND GUST OF 58 MPH
FROM THE SOUTH AT 1:37 AM SET A RECORD AT LINDBERGH FIELD FOR THE
MONTH OF DECEMBER. AREAS OF HEAVY RAINFALL DEVELOPED...BUT RAPID
MOVEMENT OF THE SHOWERS AT ABOUT 35 KT KEPT TOTALS FROM GETTING
EXCESSIVE IN MOST SPOTS.

IR ENHANCEMENT CONTINUES FROM THE LA AREA SW WITH OCCASIONAL
LIGHTNING STRIKES. BANDS OF RAPIDLY MOVING SHOWERS WITH BRIEF HEAVY
RAINFALL..AND ISOLATED THUNDERSTORMS WILL CONTINUE THROUGH 7
AM...FOLLOWED BY A WIND SHIFT TO THE SW AND DECREASING WINDS AND
SHOWERS TODAY. FLASH FLOODING AND SPOTTY WIND DAMAGE IS LIKELY
THROUGH EARLY THIS MORNING WITH FLASH FLOOD WARNINGS AND HIGH WIND
WARNINGS AND ADVISORIES IN EFFECT.

THE UPPER LOW OFF THE COAST IS BEING FORCED INLAND BY ANOTHER BIG
COLD SYSTEM DROPPING INTO THE PACIFIC NW. THIS ONE SHOULD REMAIN
FARTHER TO THE NORTH BUT STRONG...SOMEWHAT UNSTABLE W FLOW WILL KEEP
A CHANCE OF A FEW SHOWERS FROM TIME TO TIME INTO THE WEEKEND. THIS
STORM MAY EVENTUALLY WORK S ALONG THE W COAST EARLY NEXT WEEK FOR A
BETTER CHANCE OF MORE SUBSTANTIAL RAINFALL.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...

...A FLASH FLOOD WARNING REMAINS IN EFFECT FOR ALL OF SOUTHWESTERN
SAN BERNARDINO COUNTY...AND MOST OF SAN DIEGO COUNTY...INCLUDING THE
BURN AREAS THROUGH 4 AM.

FLASH FLOOD WATCH FOR ALL AREAS UNTIL 4 PM...SEE LAXFFASGX.

FLOOD ADVISORY FOR ALL AREAS UNTIL 8 AM...SEE LAXFLSSGX.

RIVER STATEMENT FOR SAN DIEGO AND SAN LUIS REY RIVERS...SEE
LAXRVSSGX.

WINTER STORM WARNING FOR THE SAN BERNARDINO AND RIVERSIDE COUNTY
MOUNTAINS ABOVE 6500 FEET UNTIL 400 PM...SEE LAXWSWSGX.

HIGH WIND WARNING FOR THE SAN BERNARDINO...RIVERSIDE AND SAN DIEGO
COUNTY MOUNTAINS UNTIL NOON...SEE LAXNPWSGX.

WIND ADVISORY ALL OTHER AREAS UNTIL NOON...SEE LAXNPWSGX.

GALE WARNING INNER AND OUTER WATERS THIS MORNING...SEE LAXCWFSGX.

MARINE WEATHER STATEMENT...SEE LAXMWSSGX.

HAZARDOUS WEATHER OUTLOOK...SEE LAXHWOSGX.

&&

JAD

In the hours before

Local storm report, Dec 29, 2:25 AM PST, 3 hours 20 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
225 AM PST WED DEC 29 2004

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

0222 AM     HIGH SUST WINDS  SAN DIEGO               32.72N 117.16W
12/29/2004  50 MPH           SAN DIEGO          CA   PUBLIC

            WINDS IN EXCESS OF 50 MPH HAVE BROUGHT NUMEROUS TREES
            DOWN THROUGHOUT THE SAN DIEGO COUNTY AREA.

&&

ECLARK
Local storm report, Dec 29, 2:28 AM PST, 3 hours 17 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
228 AM PST WED DEC 29 2004

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

0200 AM     TSTM WND GST     WINCHESTER              33.71N 117.08W
12/29/2004  65 MPH           RIVERSIDE          CA   TRAINED SPOTTER

            TREES UPROOTED.

&&

SCV
Local storm report, Dec 29, 2:44 AM PST, 3 hours 1 minute before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
244 AM PST WED DEC 29 2004

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

0145 AM     TSTM WND DMG     2 S RANCHO BERNARDO     32.99N 117.06W
12/29/2004                   SAN DIEGO          CA   TRAINED SPOTTER

            TREES, 14 INCH DIAMTER, BROEKN ABOUT 5 FEET FROM THE
            GROUND, FELL ON HOUSE.

0151 AM     TSTM WND DMG     EL CAJON                32.80N 116.96W
12/29/2004                   SAN DIEGO          CA   TRAINED SPOTTER

            TREES BROKEN. WIND ESTIMATED GREATER THAN 50 MPH.

&&

SCV
Local storm report, Dec 29, 3:17 AM PST, 2 hours 28 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
317 AM PST WED DEC 29 2004

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

0220 AM     TSTM WND GST     2 SW MURRIETA           33.54N 117.23W
12/29/2004  60 MPH           RIVERSIDE          CA   MESONET

0220 AM     TSTM WND GST     4 SSW BIG BEAR LAKE     34.19N 116.92W
12/29/2004  65 MPH           SAN BERNARDINO     CA   MESONET

&&

RB
Local storm report, Dec 29, 3:24 AM PST, 2 hours 21 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
324 AM PST WED DEC 29 2004

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

0205 AM     TSTM WND GST     JULIAN                  33.07N 116.59W
12/29/2004  69 MPH           SAN DIEGO          CA   TRAINED SPOTTER

&&

RB
Local storm report, Dec 29, 5:19 AM PST, 26 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
519 AM PST WED DEC 29 2004

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

0514 AM     SNOW             IDYLLWILD-PINE COVE     33.75N 116.72W
12/29/2004  3.0 INCH         RIVERSIDE          CA   UNKNOWN

            3 INCHES IDYLLWILD 5600 FEET SNOW BEGAN 1 HOUR AGO

0514 AM     SNOW             PHELAN                  34.43N 117.57W
12/29/2004  1.0 INCH         SAN BERNARDINO     CA   UNKNOWN

            1 INCH SNOW AT PHELAN AT 4300 FEET

&&

PURPURA

The office that day

Everything else NWS San Diego, CA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 28, 6:06 PM PSTSevere Thunderstorm WarningSGXOrange24 min
Dec 28, 11:22 PM PSTSpecial Marine WarningSGX2 hr
Dec 29, 12:10 AM PSTFlash Flood WarningSGXSan Diego4 hr
Dec 29, 12:15 AM PSTSevere Thunderstorm WarningSGXOrange60 min
Dec 29, 12:22 AM PSTSpecial Marine WarningSGX2 hr
Dec 29, 12:22 AM PSTSevere Thunderstorm WarningSGXOrange53 min
Dec 29, 1:20 AM PSTFlash Flood WarningSGXSan Bernardino3 hr
Dec 29, 1:45 AM PSTSevere Thunderstorm WarningSGXSan Diego60 min
Dec 29, 2:01 AM PSTSevere Thunderstorm WarningSGXRiverside, San Bernardino59 min
Dec 29, 3:40 AM PSTFlash Flood WarningSGXSan Bernardino2 hr
Dec 29, 3:45 AM PSTFlash Flood WarningSGXSan Diego2 hr

Nearby

Flash Flood Warnings in California, 2004Every 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.