Alert archive / California / Flash Flood Warnings in 2004

Flash Flood Warning 96, NWS San Diego, CA

December 31, 2004San Bernardino County, California

NWS San Diego, CA issued this flash flood warning at Dec 31, 2004, 11:58 AM PST for San Bernardino County, California. It was in force for 92 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
Dec 31, 2004, 11:58 AM PST (19:58 UTC)
Expired
Dec 31, 2004, 1:30 PM PST
In force
92 min
Issued by
NWS San Diego, CA
Area
Counties, with a storm outline in the text

County San Bernardino County, CA

The radar

The Santa Ana Mts radar (KSOX), 42 km from the middle of the area, began a volume at 20:00 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, 8.0 hours before the alert went out and 149 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 2004-12-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 joules per kilogram.LCLLFCEL10008507005003002001001 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 2004-12-31The 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
4 J/kg
Mixed-layer CIN
-23 J/kg
Mixed-layer LCL
867 m above ground
0-6 km bulk shear
62 kt
0-1 km storm-relative helicity
67 m²/s²
0-3 km storm-relative helicity
177 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 312003
FFWSGX
CAC071-312130-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
1158 AM PST FRI DEC 31 2004

THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN SAN BERNARDINO COUNTY
  THIS INCLUDES THE CITIES OF...YUCAIPA...SAN BERNARDINO...          
  RIALTO...LYTLE CREEK...DEVORE...REDLANDS...RANCHO                  
  CUCAMONGA...HIGHLAND...FONTANA...COLTON

* UNTIL 130 PM PST

* AT 1150 AM PST...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED STREET   
  FLOODING NEAR FONTANA. 

* MODERATE TO HEAVY RAIN OVER ALREADY SATURATED GROUND WILL BRING    
  FLASH FLOODING AND POSSIBLE MUDSLIDES TO THE INLAND EMPIRE AND THE 
  MOUNTAINS AND FOOTHILLS OF SAN BERNARDINO COUNTY THROUGH 130 PM.   
  BURN AREAS WILL BE MOST SUSEPTIBLE TO ROCK AND MUDSLIDES. 

LAT...LON 3407 11764 3401 11704 3420 11706 3431 11752

$$

MOEDE

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.