Alert archive / California / Flash Flood Warnings in 2004

Flash Flood Warning 78, NWS San Diego, CA

October 20, 20044 counties in California

NWS San Diego, CA issued this flash flood warning at Oct 20, 2004, 9:00 AM PDT for 4 counties in California. It was in force for 2 hr. 25 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Oct 20, 2004, 9:00 AM PDT (16:00 UTC)
Expired: Oct 20, 2004, 11:00 AM PDT
In force: 2 hr
Issued by: NWS San Diego, CA
Area: Counties, with a storm outline in the text

Counties Orange County, CA, Riverside County, CA, San Bernardino County, CA, San Diego County, CA

The radar

The Santa Ana Mts radar (KSOX), 44 km from the middle of the area, began a volume at 16:03 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 was reported inside it

Time	Report	Where	Remark
Oct 20, 9:04 AM PDT	FLASH FLOOD	Fallbrook, CA	INTERSECTION FLOODED AT S. MISSION RD. AT ROCKY CREST RD.
Oct 20, 9:17 AM PDT	FLASH FLOOD	San Marcos, CA	LOCAL STREET FLOODING.
Oct 20, 9:25 AM PDT	FLASH FLOOD	Fontana, CA	WATER FLODDING INTO HOUSES AT ETIWANDA AV AND HOMES AV.
Oct 20, 9:27 AM PDT	FLASH FLOOD	Devore, CA	GLEN HELEN RD AT I-15 COMPLETELY COVERED WITH ONE INCH OF MUD NEAR THE RANGER STATION.
Oct 20, 9:28 AM PDT	FLASH FLOOD	Riverside, CA	TWO FEET OF WATER AT HWY 91 AND UNIVERSITY AV.
Oct 20, 9:30 AM PDT	FLASH FLOOD	Fontana, CA	VEHICLES STUCK ON COMMUTER TRAIN TRACKS DUE TO FLOODING.
Oct 20, 9:30 AM PDT	FLASH FLOOD	Riverside, CA	VEHICLES STUCK IN DITCH FULL OF WATER. PARTIES IN VEHICLES.
Oct 20, 9:56 AM PDT	FLASH FLOOD	Costa Mesa, CA	FLOODING ON SOUTHBOUND I-405 AT BRISTOL.
Oct 20, 9:56 AM PDT	FLASH FLOOD	Lake Arrowhead, CA	MUDSLIDE ON HWY 189 IN TWIN PEAKS - RIMFOREST AREA.
Oct 20, 9:58 AM PDT	FLASH FLOOD	Winchester, CA	ROAD FLOODING, VEHICLE RESCUE, HOMES FLOODED. WIND GUSTS TO 38 MPH.
Oct 20, 10:09 AM PDT	FLASH FLOOD	Escondido, CA	FLOODING ALONG I-15 NORTH OF ESCONDIDO AT GOPHER CANYON RD.
Oct 20, 10:09 AM PDT	FLASH FLOOD	Murrieta, CA	ENTIRE ROADWAY FLOODED AT SCOTT RD. AND MENIFEE RD.
Oct 20, 10:09 AM PDT	FLASH FLOOD	Murrieta, CA	SEVERAL VEHICLES STALLED IN WATER ABOUT 20 INCHES DEEP AT SCOTT RD. AND I-215.
Oct 20, 10:18 AM PDT	FLASH FLOOD	Costa Mesa, CA	FLOODING, 3.52 INCHES SINCE MIDNIGHT.
Oct 20, 10:35 AM PDT	FLASH FLOOD	Riverside, CA	MUD SLIDE ON HWY 60 AT PEDLEY RD.
Oct 20, 10:35 AM PDT	FLASH FLOOD	Valley Center, CA	FLOODED ROADWAY OF HWY 76 AT COLE GRADE RD.
Oct 20, 10:37 AM PDT	FLASH FLOOD	Chino Hills, CA	MUD SLIDE 6 INCHES DEEP COVERING HWY 142, CARBON CANYON RD. AT CANON LN.
Oct 20, 10:37 AM PDT	FLASH FLOOD	Mira Loma, CA	FLOODING AT FLESPAR ST. AND 56TH ST. CAR STUCK IN WATER.
Oct 20, 10:37 AM PDT	FLASH FLOOD	Ontario, CA	FLOODED LANE CLOSURE WESTBOUND I-10 AT MILLIKEN AV. DUE TO MUD AND DEBRIS.
Oct 20, 10:45 AM PDT	FLASH FLOOD	Hesperia, CA	FLOODED ROADWAYS WITH 6 TO 8 INCHES OF WATER, AND 1 FOOT DEEP IN LOW SPOTS.
Oct 20, 10:50 AM PDT	FLASH FLOOD	Escondido, CA	ESCONDIDO CREEK AT HARMONY GROVE RD IS 1 FOOT FROM COVERING ROAD. SEVERAL INTERSECTIONS IN VICINITY WITH UP TO 4 INCHES WATER.
Oct 20, 10:50 AM PDT	FLASH FLOOD	Riverside, CA	FLOODED LANE ON WESTBOUND HWY 60 AT ROUBIDOUX RD.
Oct 20, 10:50 AM PDT	FLASH FLOOD	Tustin, CA	FLOODING ON HWY 241 AT HWY 261 NORTHEAST OF TUSTIN.
Oct 20, 10:50 AM PDT	FLASH FLOOD	Valley Center, CA	FLOODING ROADS IMPASSABLE AT WOODS VALLEY RD AT COOL WATER RANCH RD.
Oct 20, 11:05 AM PDT	FLASH FLOOD	2 E Hesperia, CA	STREET FLOODING. MANY INTERSECTIONS 8 TO 10 INCHES OF WATER, SOME AREAS 1 FOOT OF WATER. BACKYARD 4 INCHES OF WATER. 1.32 INCHES OF RAINFALL SINCE MIDNIGHT.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Edwards AFB, CA (KEDW), launched 12:00Z, 4.0 hours before the alert went out and 121 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: 533 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: -10 m²/s²
0-3 km storm-relative helicity: -64 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 201601
FFWSGX
CAC059-065-071-073-201800-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
900 AM PDT WED OCT 20 2004

THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN RIVERSIDE COUNTY IN SOUTHEAST CALIFORNIA
  THIS INCLUDES THE CITIES OF...TEMECULA...RUBIDOUX...RIVERSIDE...
  PERRIS...PALM SPRINGS...PALM DESERT...NORCO...MORENO VALLEY...LAKE
  ELSINORE...INDIO...HEMET...CORONA...CATHEDRAL CITY...BANNING
  
  SOUTHWESTERN SAN BERNARDINO COUNTY IN SOUTHEAST CALIFORNIA
  THIS INCLUDES THE CITIES OF...FOREST FALLS...YUCAIPA...
  VICTORVILLE...UPLAND...SAN BERNARDINO...RIALTO...REDLANDS...RANCHO
  CUCAMONGA...ONTARIO...MONTCLAIR...HIGHLAND...HESPERIA...FONTANA...
  COLTON...CHINO HILLS...CHINO...APPLE VALLEY
  
  ORANGE COUNTY IN SOUTHWEST CALIFORNIA
  THIS INCLUDES THE CITIES OF...YORBA LINDA...WESTMINSTER...TUSTIN
  FOOTHILLS...TUSTIN...STANTON...SANTA ANA...SAN JUAN CAPISTRANO...
  PLACENTIA...ORANGE...MISSION VIEJO...LAGUNA NIGUEL...LAGUNA
  HILLS...IRVINE...GARDEN GROVE...FULLERTON...FOUNTAIN VALLEY...EL
  TORO...CYPRESS...COSTA MESA...BUENA PARK...BREA...ANAHEIM
  
  NORTHERN SAN DIEGO COUNTY IN SOUTHWEST CALIFORNIA
  THIS INCLUDES THE CITIES OF...VISTA...SAN MARCOS...FALLBROOK...
  ESCONDIDO

* UNTIL 1100 AM PDT

* AT 845 AM PDT...THE PUBLIC REPORTED NUMEROUS AREAS OF FLOODING IN 
ORANGE...SOUTHWEST SAN BERNARDINO AND WESTERN RIVERSIDE COUNTIES 
WITH 2 TO 4 INCHES IN MANY AREAS. HEAVY RAIN WAS MOVING INTO 
NORTHERN SAN DIEGO COUNTY WITH OVER HALF AN INCH IN CAMP PENDLETON. 
THE FRONT WAS MOVING VERY SLOWLY SOUTHEAST AT 15 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  WARNER SPRINGS...THE WILD ANIMAL PARK...SILVERADO CANYON...SANTIAGO
  PEAK...SANTA ROSA PLATEAU...SANTA ROSA MOUNTAIN...SAN JACINTO
  PEAK...SAN GORGONIO MOUNTAIN...SAGE...RANCHITA...PHELAN...PAUMA
  VALLEY...PALOMAR MOUNTAIN...OCOTILLO WELLS...OAK GROVE...LUCERNE
  VALLEY...LAKE HENSHAW...LAKE HEMET...FREMONT CANYON...DEVORE...
  CAJON SUMMIT...ANZA...WOODCREST...WILDOMAR...VILLA PARK...VALLE
  VISTA...SUN CITY...SAN JACINTO...ROSSMOOR...RANCHO SANTA
  MARGARITA...RANCHO MIRAGE...PEDLEY...PALM DESERT COUNTRY...
  MUSCOY...MIRA LOMA...MENTONE...MARCH AFB...LOS SERRANOS...LOS
  ALAMITOS...LOMA LINDA...LAKELAND VILLAGE...LAKE ARROWHEAD...LA
  QUINTA...LA PALMA...HOME GARDENS...GRAND TERRACE...GLEN AVON...
  GEORGE AFB...EL TORO STATION...EAST HEMET...DESERT HOT SPRINGS...
  CRESTLINE...COACHELLA...CHERRY VALLEY...CANYON LAKE...CAMP
  PENDLETON SOUTH...CAMP PENDLETON NORTH...CALIMESA...BLOOMINGTON...
  BIG BEAR LAKE...BIG BEAR CITY...BERMUDA DUNES...BEAUMONT...ALISO
  VIEJO AND ADELANTO.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

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.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

LAT...LON 3380 11812 3343 11758 3307 11722 3308 11608
      3393 11619 3401 11646 3445 11642 3465 11687
      3465 11767 3434 11768 3407 11774

$$

WHITLOW

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 19, 11:50 PM PDT	Flash Flood Warning	SGX	San Bernardino	6 hr
Oct 20, 4:00 AM PDT	Flash Flood Warning	SGX	Orange	3 hr
Oct 20, 6:15 AM PDT	Flash Flood Warning	SGX	Orange, Riverside, San Bernardino, San Diego	3 hr
Oct 20, 10:38 AM PDT	Flash Flood Warning	SGX	Riverside, San Bernardino, San Diego	2 hr
Oct 20, 1:00 PM PDT	Flash Flood Warning	SGX	San Diego	2 hr
Oct 20, 3:00 PM PDT	Flash Flood Warning	SGX	San Diego	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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.