Flash Flood Warning 16, NWS San Diego, CA

304 
WGUS76 KSGX 012146
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
246 PM PDT MON AUG 1 2011

CAC065-012230-
/O.CON.KSGX.FF.W.0016.000000T0000Z-110801T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
RIVERSIDE CA-
246 PM PDT MON AUG 1 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 PM PDT FOR
CENTRAL RIVERSIDE COUNTY...

AT 236 PM PDT...HEAVY RAIN PRODUCING FLASH FLOODING WAS INDICATED BY 
DOPPLER RADAR OVER THE WARNED AREA.

THIS THUNDERSTORM WITH EXCESSIVE RAIN WILL OTHERWISE REMAIN OVER
MAINLY RURAL AREAS OF THE INDICATED COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE STORMS WERE SLOWLY DIMINISHING. RUNOFF WILL CONTINUE FOR ANOTHER 
45 MINUTES. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING 
OF SMALL CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. 
ADDITIONALLY...COUNTRY ROADS AND ALONG THE BANKS OF CREEKS...STREAMS 
AND OTHER LOW LYING AREAS ARE SUBJECT TO FLOODING.

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 3375 11669 3377 11650 3360 11630 3349 11666

$$

WHITLOW

199 
WGUS76 KSGX 012234
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
334 PM PDT MON AUG 1 2011

CAC065-012243-
/O.EXP.KSGX.FF.W.0016.000000T0000Z-110801T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
RIVERSIDE CA-
334 PM PDT MON AUG 1 2011

...THE FLASH FLOOD WARNING HAS EXPIRED FOR CENTRAL RIVERSIDE
COUNTY...

AT 325 PM THE STORM HAD DECREASED. SOME RUNOFF WILL CONTINUE BUT 
DECREASING.

LAT...LON 3375 11669 3377 11650 3360 11630 3349 11666

$$

WHITLOW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
200 PM PDT MON AUG 1 2011

.SYNOPSIS...
ENOUGH MONSOONAL MOISTURE WILL REMAIN THROUGH TUESDAY FOR SMALL
CHANCES OF AFTERNOON AND EARLY EVENING THUNDERSTORMS FOR THE
MOUNTAINS AND DESERTS. DRIER SOUTHWEST FLOW WILL PREVAIL FOR
WEDNESDAY INTO THE WEEKEND. THE MARINE LAYER WILL BEGIN TO REBOUND
THE NEXT FEW NIGHTS AND THIS WILL GRADUALLY INCREASE OUR COASTAL
CLOUD COVERAGE.

&&

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

THUNDERSTORMS STARTED ERUPTING BEFORE NOON TODAY BUT MOSTLY ALONG
THE PENINSULAR RANGE SO FAR. THESE WILL HAVE SHORT LIFE AND WE DO
NOT EXPECT THE MAGNITUDE OF THUNDERSTORMS THAT WE GOT YESTERDAY. THE
FLOW ALOFT IS SHIFTING FROM A FAVORABLE MONSOON DIRECTION TO THE
SOUTHWEST...DRIER AND LESS FAVORABLE FOR PRODUCING THUNDERSTORMS. ON
TUESDAY THE MOISTURE DECREASES FURTHER SO THE CHANCE WILL BE EVEN
LESS...AND BY WEDNESDAY WE ARE NOT FORECASTING THEM. THE HIGH
PRESSURE RIDGE OVER THE FOUR CORNERS WILL SLIDE EASTWARD UNDER THE
WEIGHT OF A WEAK TROUGH TO OUR NORTH THIS WEEK. THIS IS THE CAUSE OF
THE MONSOON MOISTURE RETREATING AND IT WILL ALSO HELP RECOVER OUR
MARINE LAYER AND FORM MORE COASTAL LOW CLOUDS EACH NIGHT AND
MORNING. TEMPS WILL BE A LITTLE BELOW AVERAGE WEDNESDAY INTO THE
WEEKEND. OVER THE WEEKEND AND EARLY NEXT WEEK THE HIGH PRESSURE
RIDGE ATTEMPTS TO BUILD WESTWARD AGAIN...MAYBE OPENING THE MONSOON
DOOR JUST A CRACK...BUT NOT ENOUGH TO MENTION ANY CHANCES OF PRECIP
IN OUR FORECAST. IT DOES LOOK NOTICEABLY WARMER NEXT WEEK.

&&

.AVIATION...
012045Z...VFR CONDITIONS FOR COASTAL SITES. THERE IS A 20 PERCENT
CHANCE OF OUTFLOW AND RAIN FROM ONGOING AND DEVELOPING THUNDERSTORMS
TO AFFECT PSP NEAR 00Z. FORCING FOR STORMS IS TERRAIN AND HEATING
BUT OUTFLOW BOUNDARIES MAY PROVIDE ADDITIONAL SUPPORT TO 01Z. NOT
MUCH INDICATION OF STRATUS RETURNING TONIGHT BUT POSSIBLY A STRIP OF
CLOUDS IN NORTHERLY LOW LEVEL FLOW JUST OFFSHORE. THERE IS A 40-50
PERCENT CHANCE FOR CRQ AND SAN TO HAVE BKN010 BY 12Z SO HAVE INCLUDED
A TEMPO GROUP FOR SAN.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...NONE.

&&

PUBLIC...MM
AVIATION...TARDY

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN DIEGO CA
425 AM PDT MON AUG 1 2011

CAZ042-043-048-050-055>058-060>062-020100-
ORANGE COUNTY COASTAL AREAS-SAN DIEGO COUNTY COASTAL AREAS-
SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE-
SAN DIEGO COUNTY VALLEYS-SAN BERNARDINO COUNTY MOUNTAINS-
RIVERSIDE COUNTY MOUNTAINS-SANTA ANA MOUNTAINS AND FOOTHILLS-
SAN DIEGO COUNTY MOUNTAINS-APPLE AND LUCERNE VALLEYS-
COACHELLA VALLEY-SAN DIEGO COUNTY DESERTS-
425 AM PDT MON AUG 1 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR ALL OF EXTREME
SOUTHWESTERN CALIFORNIA.

.DAY ONE...TODAY AND TONIGHT

THERE IS A CHANCE OF AFTERNOON AND EARLY EVENING THUNDERSTORMS IN
THE MOUNTAINS AND DESERTS. THE THE FLASH FLOOD POTENTIAL INDEX IS
MODERATE...THUNDERSTORMS ARE EXPECTED TO DEVELOP...AND ISOLATED
FLASH FLOODING IS POSSIBLE.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

FOR TUESDAY...THERE IS A SLIGHT CHANCE OF AFTERNOON AND EARLY
EVENING THUNDERSTORMS IN THE MOUNTAINS AND DESERTS. THE FLASH FLOOD
POTENTIAL INDEX IS LOW...THE RISK OF FLASH FLOODING IS MINIMAL.

.SPOTTER INFORMATION STATEMENT...
SKYWARN WEATHER ACTIVATION IS NOT REQUESTED FOR THIS AREA...
HOWEVER WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT
WEATHER CONDITIONS.

MARTIN