Area Forecast Discussion
Issued by NWS San Diego, CA

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FXUS66 KSGX 271116

Area Forecast Discussion
National Weather Service San Diego CA
316 AM PST Mon Jan 27 2020

Areas of fog and low clouds will dissipate through the morning
resulting in warm weather and mostly sunny skies through Tuesday.
Santa Ana conditions will set up for Wednesday through Saturday.
Gusty north to northeast winds are expected in the mountains,
foothills, and valleys with widespread above average temperatures
west of the mountains.



At 3 AM, cloud bases were around 2000 ft from the coast to the
valleys with fog reducing visibility to 3 to 5 miles in the Inland
Empire. The pressure gradient had turned weakly offshore and will
continue to trend offshore through Tuesday. That offshore flow will
help clear the low clouds and fog and keep them at bay for the next
couple of days. Mostly sunny skies and above average temperatures
can be expected as a ridge settles over Southern California through

Tuesday night into Wednesday, a fast moving "inside slider" moves
through the area. While no precipitation is expected, the brief
return of onshore flow could bring patchy areas of low clouds and
fog back to the coast, mainly in San Diego County. As this fast
moving system moves east, a surface high will build over the Great
Basin and remain there through Saturday. This will set up Santa Ana
conditions with gusty north to northeast winds, clear skies, and
above normal temperatures. Friday and Saturday are projected to be
the warmest days of the week with highs reaching the low 80s in the
valleys and the mid-70s along the coast. Highs in the low desert
will reach the low to mid-80s, with the High Desert hitting the low
70s. Highs in the mountains will be in the mid-60s.

Global ensembles are hinting that the ridge will begin to break down
late Sunday into Monday as a trough moves through. This pattern
change will bring cooler and cloudier weather with a slight chance
of precipitation. It is still a long way out, so confidence on
timing and amount of precipitation is low.


271000Z...Low clouds will cover most of the coastal basin with bases
1800-2500 feet MSL and areas of vis 3-5SM. Scatter out 15-17Z.
Mostly clear skies with unrestricted vis will prevail thereafter.
Local north-northeast winds with sfc gusts 20-30 kt mainly on
mountain ridges and foothills 14-23Z.


No hazardous marine weather is expected currently through Friday,
although north winds will increase Wednesday and could produce
choppy and hazardous conditions.


Elevated surf will continue this week, with surf approaching 7 feet
in San Diego County mainly Tuesday.


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




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