Alert archive / California / Flash Flood Warnings in 2004

Flash Flood Warning 71, NWS San Diego, CA

October 18, 2004San Diego County, California

NWS San Diego, CA issued this flash flood warning at Oct 18, 2004, 10:37 AM PDT for San Diego County, California. It was in force for 3 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
Oct 18, 2004, 10:37 AM PDT (17:37 UTC)
Expired
Oct 18, 2004, 1:30 PM PDT
In force
3 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), 6 km from the middle of the area, began a volume at 17:40 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.

The nearest sounding before it

San Diego, CA (KNKX), launched 12:00Z, 5.6 hours before the alert went out and 24 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 2004-10-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 94 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, San Diego, CA at 12:00Z on 2004-10-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 67 square meters per square second.1939587897Sfc1 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
94 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
633 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
67 m²/s²
0-3 km storm-relative helicity
84 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 181739
FFWSGX
CAC073-182030-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
1037 AM PDT MON OCT 18 2004

THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A

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

* UNTIL 130 PM PDT

* AT 1031 AM PDT...A LINE OF HEAVY SHOWERS WAS MOVING SOUTH THROUGH  
  THE SOUTHWESTERN PART OF SAN DIEGO COUNTY NEAR MIRA MESA...OR      
  ABOUT 8 MILES SOUTHEAST OF ENCINITAS...MOVING SOUTHEAST AT 20 MPH.

* THE THUNDERSTORM PRODUCING FLASH FLOODING WILL BE NEAR...
  RANCHO BERNARDO BY 1050 AM PDT
  POWAY BY 1055 AM PDT
  7 MILES SOUTH OF THE WILD ANIMAL PARK BY 1105 AM PDT
  RAMONA BY 1115 AM PDT
  SAN DIEGO COUNTRY ESTATES BY 1125 AM PDT

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.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

LAT...LON 3308 11730 3281 11724 3258 11704 3267 11624
      3326 11675

$$

ATKIN

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 18, 6:34 AM PDTFlash Flood WarningSGXSan Diego116 min
Oct 18, 8:19 AM PDTFlash Flood WarningSGXSan Diego2 hr
Oct 18, 1:35 PM PDTFlash Flood WarningSGXSan Diego115 min

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.