Weather Service Report


016 
FXUS66 KSGX 181050
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
350 AM PDT FRI APR 18 2014

.SYNOPSIS...
A WEAK LOW PRESSURE SYSTEM MOVING INLAND THROUGH SOUTHERN CALIFORNIA 
WILL BRING ABUNDANT MID AND HIGH CLOUDS TODAY WITH A SLIGHT CHANCE 
OF SHOWERS OVER THE MOUNTAINS AND UPPER DESERTS. SLOW INLAND WARMING 
FOR SATURDAY WITH GREATER INLAND WARMING FOR SUNDAY AND MONDAY UNDER 
HIGH PRESSURE. THE MARINE LAYER AND ONSHORE FLOW WILL CONTINUE AREAS 
OF NIGHT AND MORNING COASTAL LOW CLOUDS AND FOG. FOR TUESDAY AND 
WEDNESDAY...A STRONGER TROUGH OF LOW PRESSURE WILL MOVE INLAND ALONG 
THE WEST COAST BRINGING COOLING...DEEPENING OF THE MARINE 
LAYER...AND STRONG GUSTY WEST WINDS IN THE MOUNTAINS AND DESERTS. 
WEAKER WINDS AND MODEST WARMING FOR NEXT THURSDAY AND FRIDAY.

&&

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

UPPER LEVEL LOW PRESSURE CENTERED OVER THE CALIFORNIA BIGHT WILL 
MOVE INTO SOUTHERN CALIFORNIA THIS AFTERNOON AND INTO ARIZONA 
SATURDAY AS IT WEAKENS. THERE IS A FLOW NORTHWARD OF ABUNDANT MID 
AND HIGH LEVEL MOISTURE FROM NORTHERN BAJA AND THE ADJACENT EASTERN 
PACIFIC COASTAL WATERS INTO SOUTHERN CALIFORNIA. SOME LIGHT SHOWERS 
ARE POSSIBLE TODAY...MAINLY OVER THE MOUNTAINS AND UPPER DESERTS. 
AND GIVEN A DRY SUBCLOUD LAYER...THERE COULD BE GUSTY DOWNDRAFT 
WINDS WITH SHOWERS OR VIRGA. WEST OF THE MOUNTAINS...THE MARINE 
LAYER IS AROUND 3500 FEET DEEP WITH THE CLOUD LAYER ABOUT 1500 FEET 
DEEP SO SOME PATCHY DRIZZLE WEST OF THE MOUNTAINS CANNOT BE RULED 
OUT FOR THIS MORNING. 

FOR SATURDAY THROUGH MONDAY...HIGH PRESSURE WILL BRING A WARMING 
TREND INLAND WITH A SLOWLY DECREASING MARINE LAYER DEPTH WITH NIGHT 
AND MORNING LOW CLOUDS AND FOG STILL EXTENDING INLAND INTO PORTIONS 
OF THE VALLEYS.

FOR TUESDAY AND WEDNESDAY...A STRONGER TROUGH OF LOW PRESSURE WILL 
MOVE INLAND ALONG THE WEST COAST BRINGING COOLING...A DEEPER MARINE 
LAYER...AND STRONG GUSTY WEST WINDS IN THE MOUNTAINS AND DESERTS. 
WITH THE CURRENT TROUGH AMPLITUDE...ANY PRECIPITATION WOULD MOSTLY 
REMAIN NORTH OF POINT CONCEPTION. SLOW WARMING AND WEAKER WINDS FOR 
THURSDAY AND FRIDAY OF NEXT WEEK UNDER WEAK HIGH PRESSURE. 

&&

.AVIATION...
180900Z...THE COASTAL BASIN WILL BE FILLED WITH LOW CLOUDS WITH 
BASES AROUND 2500 FEET ASL RISING TO AROUND 3000 FEET. TOPS WILL 
RISE TO OVER 5000 FEET. THAT WILL MEAN SOME COASTAL SLOPES WILL BE 
OBSCURED IN FOG. THESE WILL PARTIALLY SCATTER OUT BY 18-19Z...BUT 
SOME BROKEN CIGS AROUND 3000 FEET WILL CONTINUE THROUGH THE DAY. 
MEANWHILE HIGHER CLOUDS AOA 12000 FEET ASL WILL CONTINUE TODAY OVER 
ALL AREAS. IN THE MOUNTAINS THERE IS A SLIGHT CHANCE OF HIGH BASED 
CONVECTION AND VIRGA THAT COULD PRODUCE AN ISOLATED DOWNDRAFT GUST 
TO 30 KT TODAY. LOW CLOUDS WILL REDEVELOP IN AND FILL THE ENTIRE 
COASTAL BASIN DURING THE EVENING WITH BASES AROUND 2500 FEET ASL.

&&

.MARINE...
NO SIGNIFICANT MARINE WEATHER CONDITIONS THROUGH MONDAY. 
STRONG NORTHWEST WINDS WILL ARRIVE TUESDAY AND INCREASED NORTHWEST 
SWELL WILL FOLLOW TUESDAY NIGHT. 

&&

.SKYWARN... 
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE 
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...NONE.
PZ...NONE.

&&

$$

PUBLIC...17
AVIATION/MARINE...MM







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