Area Forecast Discussion
Issued by NWS San Diego, CA

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000
FXUS66 KSGX 260435
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
935 PM PDT MON MAY 25 2015

.SYNOPSIS...
A SEASONALLY DEEP MARINE LAYER WILL CONTINUE TO BRING AREAS OF
CLOUDS...FOG...AND SOME PATCHY DRIZZLE AT TIMES WEST OF THE
MOUNTAINS EARLY THIS WORK WEEK...WHILE THE MOUNTAINS AND DESERTS
ENJOY FAIR SKIES AND WARMER CONDITIONS. BETTER CLEARING IS
EXPECTED FOR THE LATTER HALF OF THE WEEK AS HIGH PRESSURE BUILDS
ALOFT AND THE MARINE LAYER THINS BACK TOWARD THE COAST AND WESTERN
VALLEYS. THE WARMEST WEATHER IS EXPECTED NEXT WEEKEND...FOLLOWED
BY SLIGHT COOLING AND STRONGER ONSHORE FLOW AS WE HEAD INTO THE
MONTH OF JUNE.

&&

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

THE MARINE STRATUS IS MAKING QUITE THE COMEBACK THIS EVENING.
THERE WAS SOME PARTIAL CLEARING LATE IN THE AFTERNOON TODAY.
HOWEVER A STRONG INVERSION AND DECENT ONSHORE FLOW IS PUSHING THE
MARINE STRATUS BACK INLAND ALONG WITH DEVELOPMENT THROUGH THE
COASTAL SLOPES. THERE WILL ALSO BE SOME PATCHY DRIZZLE THROUGH THE
NIGHT ALONG THE COASTAL SLOPES. THE MARINE INVERSION IS HINTING
AT SOME SHALLOWNESS DEVELOPING WITH THE LATEST SOUNDING AND
BELIEVE FOR TOMORROW AFTERNOON THE STRATUS WILL BE RELEGATED TO
THE IMMEDIATE COAST. GRADUAL INCREASING HEIGHTS EARLY THIS WEEK
WILL CONTINUE TO CHIP AWAY AT THE HEIGHT OF THE MARINE LAYER AND
CAUSE INLAND TEMPERATURES TO CONTINUE TO INCREASE THROUGH MID
WEEK.

&&

.LONG TERM...

THE 12Z GFS/EC OPERATIONAL RUNS REMAIN IN GOOD AGREEMENT FOR THE
PATTERN WELL INTO NEXT WEEK. WEAK TROUGHING IS FORECAST FOR THE MID-
WEEK PERIOD...FOLLOWED BY RIDGING INTO THE WEEKEND...AND THEN ZONAL
FLOW NEXT WEEK. AT THE SAME TIME...SURFACE PRESSURE GRADIENTS REMAIN
ONSHORE WITH AT LEAST A SHALLOW MARINE LAYER OVER COASTAL AREAS.
THE DEPTH OF THE MARINE LAYER AND RIDGING ALOFT LATE IN THE WEEK
SHOULD ENSURE SUNNY AND WARM AFTERNOONS INLAND...WITH LESS
CERTAINTY OVER COASTAL AREAS WHERE A STRONG INVERSION AND ONSHORE
FLOW MY KEEP AREAS OF CLOUDS/FOG INTACT OR AT LEAST NEARBY SOME
DAYS.

DAYTIME HIGHS ARE FORECAST TO BE BACK TO AVERAGE FOR LATE MAY OVER
THE DESERTS BY MIDWEEK...AND THEN THEN SEVERAL DEGREES ABOVE
AVERAGE BY THE WEEKEND...WHILE COASTAL AREAS VARY LITTLE. AND OTHER
THAN PATCHY DRIZZLE FROM THE MARINE LAYER...NO FURTHER PRECIPITATION
IS EXPECTED.

&&

.AVIATION... 260400...COAST/VALLEYS...OVC-BKN LOW CLOUDS WITH BASES
FROM 1800-2400 FT MSL...AND TOPS BETWEEN 3000-3500 FT MSL WILL
CONTINUE OVERNIGHT. VIS WILL BE REDUCED LOCALLY TO 3-5
SM...ESPECIALLY OVER THE INLAND EMPIRE AND ALONG THE COASTAL
TERRAIN. PATCHY -DZ IS POSSIBLE THROUGH 19Z TUESDAY. LOW CLOUDS WILL
STRUGGLE TO CLEAR AGAIN ON TUESDAY...WITH A LOW TO MODERATE CHANCE
OF COASTAL TAF SITES SEEING FEW-SCT CONDITIONS BETWEEN 20Z TUESDAY
AND 02Z WEDNESDAY. BASES WILL HOVER AROUND 2000 FT MSL TUESDAY
AFTERNOON WITH 1600 TO 2200 FT MSL BASES RETURNING TO COASTAL TAF
SITES AFTER 00Z WEDNESDAY.


MTNS/DESERTS...UNRESTRICTED VIS WITH FEW-SCT AOA 20000 FT MSL
THROUGH TUESDAY EVENING.

&&

.MARINE...
900 PM...NO HAZARDOUS MARINE WEATHER IS EXPECTED THROUGH SATURDAY EVENING.


&&

.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...BROTHERTON
AVIATION/MARINE...ALBRIGHT
LONG TERM...JAD


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