Area Forecast Discussion
Issued by NWS San Diego, CA

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000 FXUS66 KSGX 171608 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 905 AM PDT Thu Aug 17 2017 .SYNOPSIS...
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Fair and mild weather will continue this coming week, with coastal clouds nights and mornings.
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&& .DISCUSSION...
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FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... Coastal low clouds struggled to get traction overnight and as a result the sun greeted most of us this morning. There was a slight offshore trend in our pressure gradients that probably inhibited the low cloud formation. Anyway, that`s our explanation. Obviously today will be sunny for most areas. The marine layer and onshore flow should stabilize better for a more uniform coastal cloud deck tonight, and clouds/fog could reach into the westernmost inland valleys. Copy and paste this idea for the coming seven days and your forecast should be pretty accurate. The day to day fluctuations in cloud coverage and temperature will be too subtle to notice unless you`re really paying attention. We are paying attention around here, so we`ll mention a very weak trough develops Sunday and Monday that will probably push nocturnal coastal clouds a little farther inland and bump temps downward a couple degrees. For the entire coming week we see no credible hint from models about any monsoon flow. That will mean mostly clear skies (except for the nocturnal coastal clouds), along with dry and mild weather with temps a little under August averages.
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&& .AVIATION...
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161525Z...Coast/Valleys...Areas of low clouds with bases around 1500 ft MSL and tops to 2500 ft MSL cover portions of Orange County and southern San Diego County at this hour, impacting KSAN and KSNA. Clearing to the coast is expected by 17Z. Low clouds with bases near 1200 ft msl will return to the coast after 03Z Friday, slowly spreading inland about 20 miles by 12Z Fri. Impacts to KONT and KSBD are doubtful. Mountains/Deserts...Clear skies and unrestricted visibility will continue through Friday morning.
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&& .MARINE... No hazardous marine weather is expected through Monday. && .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...MM AVIATION/MARINE...PG

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