000 
fxus66 ksgx 201014 
afdsgx 


Area forecast discussion 
National Weather Service San Diego California 
314 am PDT Wed Jun 20 2018 


Synopsis... 
high pressure aloft will bring hot weather to inland areas through 
Friday with the heat peaking Thursday and Friday. The marine 
layer and onshore flow will keep coastal areas cooler and moderate 
the heat in the valleys. Night and morning low clouds and fog will 
spread inland into portions of the western valleys at times and 
may be slow to clear near some beaches in the afternoons. High 
pressure aloft will weaken some for the weekend through early next 
week with inland high temperatures around 5 degrees lower. 


&& 


Discussion...for extreme southwestern California including Orange... 
San Diego...western Riverside and southwestern San Bernardino 
counties... 


Short term (today through friday)... 
high pressure centered over northern baja will bring warming to 
inland areas through Friday with the heat peaking Thursday and 
Friday with high temperatures exceeding 110 in portions of the 
lower deserts. 


The marine layer is a little lower than 24 hours ago...generally 
2000 to 2500 feet. A weak coastal eddy is over the coastal waters 
with widespread stratus over the coastal waters extending locally 
inland along the coast. There is very weak offshore lower level 
flow that was enough to erode the eastern edge of the stratus 
earlier and push it off the coast in some locations. The stratus 
is now pushing back inland and should reach portions of the 
western valleys in San Diego County past sunrise before clearing 
back towards the coast during the morning. The night and morning 
low clouds and fog will extend inland into portions of the western 
valleys at times...and may be slow to clear near some beaches in 
the afternoons. 


&& 


Long term (saturday through tuesday)... 
a trough low low pressure moving inland through the Great Basin 
will suppress the subtropical high pressure to the south a little 
and increase the onshore flow across Southern California. This 
will spread some coastal cooling inland with high temperatures 
around 5 degrees lower than during the peak of the heat for 
Thursday and Friday. 


&& 


Aviation... 
201000z...coast/valleys...low clouds, with bases around 1400 ft mean sea level 
and tops to 1800 ft msl, will continue to develop into the valleys 
this morning. Visible will lower to 2-4 sm br where low clouds near 
higher terrain. Stratus will clear towards the coast by late 
morning, but may linger along the beaches throughout the day. Low 
clouds will redevelop again this evening, with slightly lower tops 
and bases. 


Mountains/deserts...mostly clear with unrestricted visible through 
Thursday morning. 


&& 


Marine... 
no hazardous marine weather through Sunday. 


&& 


Skywarn... 
Skywarn activation is not requested. However weather spotters are 
encouraged to report significant weather conditions. 


&& 


Sgx watches/warnings/advisories... 
California...excessive heat warning from 11 am Thursday to 8 PM PDT Friday 
for apple and Lucerne valleys-Coachella Valley-San Diego 
County deserts-San Gorgonio Pass near Banning. 


Pz...none. 


&& 



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