Flash Flood Warning 38, NWS San Diego, CA

000 
WGUS76 KSGX 062030
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
128 PM PDT WED SEP 6 2006

CAC065-071-062100-
SAN BERNARDINO CA-RIVERSIDE CA-
128 PM PDT WED SEP 6 2006

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 200 PM PDT FOR NORTH
CENTRAL RIVERSIDE AND SOUTH CENTRAL SAN BERNARDINO COUNTIES...

AT 117 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A THUNDERSTORM PRODUCING FLASH FLOODING.  THIS STORM WAS
LOCATED NEAR SAN GORGONIO MOUNTAIN...OR ABOUT 7 MILES EAST OF FOREST
FALLS...MOVING EAST AT 5 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO THE 
MILLARD AND SAWTOOTH BURN AREAS.

THE FLASH FLOOD WARNING ALSO INCLUDES MORONGO VALLEY.

IN ADDITION TO FLASH FLOODING...RAINFALL IS EXPECTED TO CAUSE DEBRIS
FLOWS IN THE SAWTOOTH-MILLARD BURN AREAS ACCORDING TO THRESHHOLDS
PROVIDED BY THE USGS. AREAS AFFECTED INCLUDE PARTS OF HIGHWAY 247...
BIG MORONGO CANYON ROAD...PIONEERTOWN ROAD AND PIPES CANYON ROAD.

DEBRIS FLOWS...INCLUDING MUD AND ROCK SLIDES...ARE EXPECTED WITH THIS
STORM. MUD SLIDES AND ROCK SLIDES CAN POTENTIALLY TRAP AND KILL
PEOPLE CAUGHT IN THEIR PATH.

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 3392 11676 3391 11656 3411 11650 3471 11670
      3473 11708 3416 11704

$$

SCV

000 
WGUS76 KSGX 062059
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
156 PM PDT WED SEP 6 2006

CAC065-071-062106-
SAN BERNARDINO CA-RIVERSIDE CA-
156 PM PDT WED SEP 6 2006

...THE FLASH FLOOD WARNING WILL EXPIRE AT 200 PM PDT FOR NORTH
CENTRAL RIVERSIDE AND SOUTH CENTRAL SAN BERNARDINO COUNTIES...

THUNDERSTORMS HAVE WEAKENED OVER THE SAWTOOTH AND MILLARD BURN 
AREAS...HOWEVER RUNOFF WILL CONTINUE WITH DEBRIS AND ROCK FLOWS 
STILL POSSIBLE. ADDITIONAL THUNDERSTORMS WITH HEAVY RAIN MAY MOVE 
OVER THE BURN AREA OVER THE NEXT SEVERAL HOURS. 

LAT...LON 3392 11676 3391 11656 3411 11650 3471 11670
      3473 11708 3416 11704

$$

SCV

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
930 AM PDT WED SEP 6 2006

.SYNOPSIS...WEAKENING HIGH PRESSURE WILL BRING COOLER WEATHER AND AN
INCREASE IN COASTAL CLOUDS DURING THE NIGHTS AND MORNINGS THROUGH
THE WEEKEND. A SLIGHT CHANCE OF AFTERNOON SHOWERS AND THUNDERSTORMS
IN THE MOUNTAINS WILL CONTINUE THROUGH THURSDAY...BUT DRY WEATHER
INTO NEXT WEEK.

&&

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

SOME FOG DEVELOPED IN THE COASTAL AREAS AND SOME STRATUS FORMED OVER
THE BYTE EAST OF SAN CLEMENTE ISLAND EARLIER THIS MORNING...BUT
QUICKLY DISSIPATED. THE LARGE MASS OF MARINE LAYER CLOUDS REMAINS
WEST AND NORTH OF SAN CLEMENTE ISLAND. PRESSURE GRADIENTS ARE STILL
OFFSHORE IN MOST PLACES...BUT TRENDING ONSHORE WITH SAN-IPL NOW
ABOUT 2 MB ONSHORE.

THE MID LEVEL MOISTURE HAS DECREASED...BUT THE MORNING NKX SOUNDING
SHOWS PWS OF 1.49 INCHES AND EASTERLY WINDS UP TO 550 MB. DEW POINT
TEMPERATURES IN THE LOWER DESERTS CONTINUE TO BE IN THE UPPER 60S TO
MID 70S...SO ISOLATED CONVECTION AND TSTORMS CAN OCCUR IN THE MTNS
TODAY BUT NOT IN THE VALLEYS. CUMULUS MAY CONTINUE TO DEVELOP IN THE
MTNS THU AND FRI AFTERNOONS...BUT CONVECTION IS UNLIKELY THEN.
MEANWHILE TEMPERATURES WILL DECREASE AS THE MARINE LAYER BEGINS TO
ASSERT ITSELF AND BRING A RETURN MORE SEASONAL WEATHER WITH THE
POTENTIAL FOR LOCALLY DENSE FOG IN THE COASTAL AREAS THU MORNING.
NOT SO MUCH COOLING IN THE DESERT AND MTNS...BUT THE COAST AND
VALLEYS WILL COOL DOWN 5-10 DEGREES. ALL THIS DUE TO THE WEAKENING
HIGH PRESSURE RIDGE ALOFT AND A WEAK TROUGH MOVING OVER THE WEST
COAST...A PATTERN THAT WILL LIKELY CONTINUE INTO THE WEEKEND.

THE LATEST RUNS SHOW ONLY A SSIGNIFICANT REBUILDING OF THE HIGH
PRESSURE RIDGE EARLY NEXT WEEK...BUT THE LOCATION DOES NOT FAVOR
MOIST SUB TROPICAL FLOW INTO SOCAL. THERE HAS BEEN SOME RUN TO RUN
INCONSISTENCY WHICH HAS REDUCED CONFIDENCE IN THE MOISTURE FORECAST
FOR NEXT WEEK. THE FORECAST FOR NOW SHOWS A SLIGHT WARMING TREND.

&&

.AVIATION...
A VERY SHALLOW MARINE LAYER CONTINUES OVER THE AREA THIS MORNING
WITH VFR CONDITIONS EXISTING AT ALL AIRPORTS OVER THE AREA AT THIS
TIME. EXPECT THE MARINE LAYER TO BEGIN TO RECOVER THIS EVENING AND
TONIGHT AS A WEAK EDDY DEVELOPS OVER THE COASTAL AIRPORTS. THIS
COULD BRING AREAS OF STRATUS/FOG BACK TO THE COAST THIS EVENING
WHICH COULD IMPACT THE COASTAL AIRPORTS AT TIMES OVERNIGHT WITH LIFR
CONDITIONS. STRATUS/FOG SHOULD BE GONE WITHIN AN HOUR OR TWO AFTER
SUNRISE ON THURSDAY.

ABOVE THE MARINE LAYER...THE AIR MASS REMAINS UNSTABLE WITH SOME
MOISTURE SO EXPECT SOME CONVECTION OVER THE MOUNTAINS THIS AFTERNOON
WITH ISOLATED THUNDERSTORMS. THUNDERSTORM BASES SHOULD BE AROUND
8000 FEET MSL WITH TOPS ABOVE FL400 AT TIMES. THUNDERSTORMS SHOULD
DISSIPATE BY SUNSET.

&&

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

&&

PUBLIC...PG
AVIATION...HORTON

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN DIEGO CA
400 AM PDT WED SEP 6 2006

CAZ055-056-058-070200-
SAN BERNARDINO COUNTY MOUNTAINS-RIVERSIDE COUNTY MOUNTAINS-
SAN DIEGO COUNTY MOUNTAINS-
400 AM PDT WED SEP 6 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MOUNTAINS OF SOUTHWEST
CALIFORNIA.

.DAY ONE...TODAY AND TONIGHT

FOR THIS AFTERNOON AND EARLY EVENING...THE FLASH FLOOD POTENTIAL
INDEX IS LOW TO MODERATE. THUNDERSTORMS WITH AREAS OF HEAVY RAIN ARE
POSSIBLE CAUSING A SLIGHT CHANCE OF FLASH FLOODING.

OTHERWISE...NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

FOR THURSDAY...SLIGHT CHANCE OF AFTERNOON AND EARLY EVENING
THUNDERSTORMS.

OTHERWISE...NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

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

MM