Area Forecast Discussion

FXUS66 KEKA 102201
National Weather Service Eureka CA
201 PM PST Sun Dec 10 2017
.SYNOPSIS...Dry weather accompanied by mild afternoons and cool
nights is forecast to give way to cloudier conditions and possible
rain next weekend.
.DISCUSSION...An upper ridge remains centered over the west coast,
and will support a continuation of mild afternoons and cool 
nights through early to mid week. Thereafter, model guidance shows
the upper ridge breaking down Thursday into Friday as a northern 
stream trough moves across the Pacific Northwest. This will drive 
a weak front southward across NWRN CA Thursday night, resulting in
an increase in clouds, and a very modest increase in 
precipitation potential over mainly Del Norte county. Strong 
westerly moisture flux is then forecast to spread across coastal 
OR and WA during the weekend. The far southern periphery of this 
moistures will potentially impact northern Humboldt county, 
northern Trinty county, and much of Del Norte county. Thus, 
inherited POP values have been raised accordingly.
.AVIATION...VFR conditions through today. The closest piece of 
clouds are at least 200 miles west of the Redwood Coast. Do 
expect VFR conditions to prevail for the next 24 hours. Don't 
expect low clouds and fog to form in all terminals as we are still
under the influence of this anomalously dry airmass. /RCL
.MARINE...Fairly tranquil marine weather pattern will continue 
through the next few days. A strong high pressure remains over 
western North America, while the main storm track remains well 
west of the West Coast. By middle of the week, a thermal trough is
forecasted to develop along the CA coast, and this will enhance 
the northerly pressure gradient over NW CA waters at that time.
Light and variable winds in NW CA coastal waters through first 
part of Sunday. Winds will then turn back to the south late this 
afternoon. South winds will continue through Monday evening, 
before flipping back to the north Monday night. Looks like there 
will be a period of stronger north wind starting on Wednesday, 
courtesy of the stronger northerly pressure gradient over NW CA 
waters. North winds will increase further at the end of the work 
With the light winds, there is not much wind waves that we are 
dealing with. Combined seas is around 5 to 7 feet through Monday 
night. There is a weak long period south swell, with a mid period 
decaying southwest swell. There will be a fresh west swell moving 
into the waters tonight and continue into Tuesday night. Looks 
like more significant wind waves will start to develop on 
Wednesday, besides another fresh northwest swell. Looks like seas 
will turn hazardous starting middle of the week. 
There are no marine hazards in effect at this time. /RCL
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