Alert archive / California / Flash Flood Warnings in 1998

Flash Flood Warning 3, NWS San Diego, CA

February 7, 1998Orange County, California

NWS San Diego, CA issued this flash flood warning at Feb 7, 1998, 11:45 PM PST for Orange County, California. It was in force for 75 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
Feb 7, 1998, 11:45 PM PST (07:45 UTC)
Expired
Feb 8, 1998, 1:00 AM PST
In force
75 min
Issued by
NWS San Diego, CA
Area
Whole counties

County Orange County, CA

The nearest sounding before it

San Diego, CA (KNKX), launched 00:00Z, 7.8 hours before the alert went out and 111 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 00:00Z on 1998-02-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 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 00:00Z on 1998-02-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 1 square meters per square second.1939Sfc1 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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1095 m above ground
0-6 km bulk shear
2 kt
0-1 km storm-relative helicity
1 m²/s²
0-3 km storm-relative helicity
4 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 
TTAA00 KSAN 080748 COR
FFWSAN
CAC059-080900-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING...CORRECTION
NATIONAL WEATHER SERVICE SAN DIEGO CA
1145 PM PST SAT FEB 7 1998

THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL 100 AM PST
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN SOUTHWEST CALIFORNIA

   ...SOUTHERN ORANGE COUNTY


DOPPLER RADAR AND AUTOMATED RAIN GAUGES INDICATE VERY HEAVY RAINS OVER
SOUTHERN ORANGE COUNTY WHICH ARE CAPABLE OF SIGNIFICANT FLASH FLOODING.
LAGUNA BEACH REPORTED 0.94 INCHES OF RAIN IN THE HALF HOUR PERIOD
BETWEEN 1110 PM AND 1140 PM. THUNDERSTORMS WITH HEAVY RAIN WILL CONTINUE
TO MOVE INTO SOUTHERN ORANGE COUNTY FROM THE OCEAN BETWEEN 1145 PM AND
1 AM...AND FLASH FLOODING IS EXPECTED IN THESE AREAS.

...CORRECTED EXPIRATION TIME...

MAXWELL

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 Feb 7, 9:40 PM PST, 2 hours 5 minutes earlier.

Area forecast discussion, Feb 7, 9:40 PM PST, 2 hours 5 minutes before
SOUTHWESTERN CALIFORNIA AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
940 PM PST SAT FEB 7 1998

                          ...SYNOPSIS...

HEAVY SURF ADVISORY THROUGH SUNDAY. WINTER WEATHER ADVISORY IN THE
MOUNTAINS ABOVE 5500 FT UNTIL 6 AM SUNDAY. URBAN FLOOD ADVISORY
FOR ORANGE COUNTY UNTIL 10 PM. A WEST-TO-EAST ORIENTED FRONT WILL
SLOWLY MOVE SOUTH OVERNIGHT...DROPPING FROM 1 TO 2 INCHES OF RAIN IN
ORANGE COUNTY AND 1/2 TO 1 INCH ELSEWHERE WEST OF THE MOUNTAINS. SNOW
LEVEL NEAR 7000 FEET TONIGHT...LOWERING TO 5000 FEET BY MORNING. RAIN
SHOULD TAPER TO SHOWERS IN THE MORNING.

                         ...DISCUSSION...
STRONG 300 MB DIVERGENCE ASSOCIATED WITH NW QUADRANT OF 110 KT ZONAL
JET DOING A GOOD JOB OF LIFTING A 15000 FT DEEP MOIST LAYER TONIGHT...
AND CAUSING HEAVY RAINS IN ORANGE COUNTY...AND EXTREME WESTERN RIV
AND SBD COUNTIES. THIS WILL WEAKEN OVERNIGHT...AND ASSOCIATED WEST
TO EAST FRONT WIIL SLOWLY MOVE SOUTH. MUCH OF MOIST AIR SEEMS TO
ORIGINATE FROM THE MALAYSIAN PLUME...JUST ANOTHER ABBERATION OF EL
NINO. THOUGHT THE JET WOULD BECOME ANTICYCLONIC BEFORE COMING INTO
ORANGE COUNTY...BUT IT DIDNT. BUT ALL MODELS SHOW JET ZONALIZING
AND LIFTING NORTHWARD LATE SUNDAY. ONE MORE SHORT WAVE SUNDAY NIGHT
STILL HAS A GOOD CHANCE FOR LESSER RAIN...THEN RIDGING GIVING SCALIF
A BREAK FROM THE RAINS.

SAN WB 054/062 052/063 051 149632

MACKECHNIE

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 8, 3:30 AM PSTFlash Flood WarningSGXSan Diego90 min

Nearby

Flash Flood Warnings in California, 1998Every flash flood warning in 1998

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.