Area Forecast Discussion
Issued by NWS San Diego, CA

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000
FXUS66 KSGX 271601
AFDSGX

-AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
900 AM PDT WED MAY 27 2015

.SYNOPSIS... HIGH PRESSURE WILL FLATTEN THE MARINE LAYER AND BRING
INLAND WARMING THROUGH SATURDAY. AFTER TODAY...IT WILL BE QUITE WARM
INLAND...WHILE COASTAL AREAS REMAIN SEASONAL. FOR SUNDAY THROUGH
EARLY NEXT WEEK...A TROUGH OF LOW PRESSURE WILL MOVE INLAND ALONG
THE WEST COAST. THIS WILL BRING A COOLING TREND...ALONG WITH A
DEEPENING OF THE MARINE LAYER.

&&

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

EARLY MORNING SATELLITE IMAGERY ONCE AGAIN THIS MORNING SHOWED
EXTENSIVE MARINE STRATUS FROM THE LOWER COASTAL SLOPES...EXTENDING
WELL OUT ACROSS THE CA BIGHT. AND AGAIN THIS MORNING DRIZZLE WAS
OCCURRING ACROSS PORTIONS OF ORANGE...AND MUCH OF WESTERN SAN DIEGO
COUNTY WHERE SEVERAL RAIN GAGES REPORTED VERY LIGHT ACCUMULATIONS OF
.01-.02 INCH. THE 12Z MIRAMAR SOUNDING HAD A DEEP 2300 FT SATURATED
LAYER TOPPED BY A WEAK 5 DEGREE C INVERSION. SEVERAL PILOT REPORTS
EARLY IN THE DAY ALSO INDICATE ABOUT A 2K FT DEEP CLOUD LAYER.

TODAY WILL BE SIMILAR TO YESTERDAY...EXCEPT SLIGHTLY WARMER
INLAND...AND POSSIBLY BETTER CLEARING ALONG THE COAST. THE LOW
CLOUDS AND FOG AND PATCHY DRIZZLE WILL REDEVELOP AGAIN TONIGHT...
EXCEPT NOT EXTENDING AS FAR INLAND WITH BETTER CLEARING ON THU.

A WEAK UPPER-LEVEL TROUGH WILL MOVE ACROSS SOCAL TODAY...FOLLOWED BY
A SHORT-WAVE RIDGE INTO SATURDAY. AS THE RIDGE BUILDS...THE MARINE
LAYER WILL FLATTEN...AND THE INVERSION WILL STRENGTHEN. THE RESULT
WILL BE BETTER CLEARING AWAY FROM THE COASTAL STRIP...AND WARMER
DAYS. MOST OF THE WARMING WILL BE FELT INLAND...BUT EVEN COASTAL
AREAS WILL SEE MORE SUN AND SLIGHTLY WARMER WEATHER. HOWEVER...THE
STRONGER INVERSION MAY STILL KEEP SOME MARINE CLOUDS NEAR THE
BEACHES AND LOCALLY INLAND MUCH OF THE DAY.

AS THE RIDGE MOVES EAST SUN...A MORE PERSISTENT LONGWAVE TROUGH WILL
DEVELOP OVER THE WEST. THIS WILL BRING INCREASING ONSHORE FLOW AND A
DEEPENING MARINE LAYER FOR SEASONAL JUNE WEATHER NEXT WEEK.

DAYTIME MAXIMUM TEMPERATURES WILL RISE ABOVE AVERAGE INLAND ON
THURSDAY...AND CONTINUE QUITE WARM THROUGH SUNDAY. AFTER SUNDAY...
GRADUALLY COOLER. ALONG THE COASTAL STRIP...DAYTIME TEMPERATURES
WILL BE CLOSE TO AVERAGE THROUGH THE PERIOD WITH PERIODS OF LOW
CLOUDS AND FOG...MAINLY NIGHTS AND MORNINGS.

&&

.AVIATION... 271530...COAST/VALLEYS...LOW CLOUDS BASED NEAR 2000
FEET MSL WITH TOPS AROUND 3500 FEET MSL...WITH LOCAL VIS 3-5SM NEAR
HIGHER TERRAIN AND IN DRIZZLE. IMPROVING TO SCT-BKN LOW CLOUDS
27/21Z TO 28/01Z SOME AREAS...THEN LOW CLOUDS RETURNING...WITH
SLIGHTLY LOWER BASES AND TOPS. CONFIDENCE IN MAINLY BKN-OVC CLOUD
COVERAGE KCRQ-KSAN TAFS TODAY IS MODERATE-HIGH.

MOUNTAINS/DESERTS...LOWER COASTAL SLOPES OBSCURED IN CLOUDS BELOW
3500 FEET MSL TIL 27/18Z AND AFTER 28/08Z...OTHERWISE MOSTLY CLEAR
WITH UNRESTRICTED VISIBILITIES.

&&

.MARINE...

800 AM...NO HAZARDOUS MARINE WEATHER IS EXPECTED THROUGH SUNDAY
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...JAD
AVIATION/MARINE...SMALL


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