Area Forecast Discussion
Issued by NWS Eureka, CA

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000
FXUS66 KEKA 211239 CCA
AFDEKA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
429 AM PST Sat Jan 21 2017

.SYNOPSIS...Scattered showers with high elevation snow will
continue through midday, and this will be followed by a potent
storm tonight and early Sunday. The inclement weather pattern will
finally give way to downright pleasant and dry conditions by mid-
week.

&&

.DISCUSSION...Numerous convective showers continue to plague the
cwa this morning. While rain amounts with these showers are not
particularly significant from a hydrologic standpoint, they are
enough to keep the low elevations wet and the high elevations
snowy in most locations. Have let the winter weather advisories
continue to reflect the additional snow...but snow rates should
diminish by late morning. A brief break in the weather will occur
this afternoon and early evening before all attention turns to yet
another notably potent storm system that which will move through
the region latet tonight and early Sunday. Multiple hazards can be
expected with this storm, including periods of heavy rain and
localized flooding, potentially damaging wind gusts, high
elevation snow, and very hazardous marine conditions. More details
on each of these hazards can be found below. Hazardous conditions
will likely diminish beyond Sunday, and downright pleasant weather
can be expected by the middle and end of the week.


&&

HIGH SURF...Overnight, the coastal buoys saw wave heights increasing
to around 22 to 27 feet, with wave periods of around 16 to 18
seconds. Using wave height of 27 feet and wave period of 18 seconds,
that give us a surf height of around 32 feet. Do expect breaking
waves of 25 to 35 feet to persist through this afternoon. Thus, the
High Surf Warning is in effect through this afternoon for beaches
along the NW California coast. /RCL

&&

.AVIATION...Rain showers will continue through today. All terminals
saw conditions fluctuation between VFR/MVFR overnight. This will
continue through today as more showers move in from the west.
Windswill remain gusty through today. Winds will pick up further
this evening as a weather front moves towards the coast. Winds will
gust as high as 40 to 50 kt for Crescent City area, 30 to 40 kt for
Arcata, and around 30 kt for Ukiah. Also have low level wind shear
to 50 kt across all terminals overnight tonight. /RCL

&&

.MARINE...Very active pattern for the marine weather in the near
term. Wave heights will be around 25 to 30 feet today in the coastal
waters due to the long fetch westerly swell. The wave heights will
drop to around 20 feet tonight. However, the elevated wave heights
will persist through the rest of the weekend into next Tuesday.

This morning, winds will be from the west at around 15 to 25 kt. By
this evening, the winds will shift south and increase again as a
strong weather front approach the area from the west. Do expect
south wind of 30 to 45 kt with gusts to 60 kt from this evening into
the overnight hours. By early morning tomorrow, the front will push
through the area and winds will be coming from the southwest at
around 20 to 25 kt and continue through Monday. After that, the
winds will be lighter.

Have the hazardous seas warning for the NW California waters through
this afternoon, then a Storm Warning from this evening through the
overnight hours. /RCL


&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...Wind Advisory from 8 PM this evening to 3 AM PST Sunday for
     CAZ103-109.

     High Surf Warning until 4 PM PST this afternoon for CAZ101-103-
     104-109.

     Winter Weather Advisory until 10 AM PST this morning for CAZ102-
     105>108-110-111.

     Winter Storm Watch from this evening through Sunday afternoon
     for CAZ107-108.

     High Wind Warning from 8 PM this evening to 2 AM PST Sunday for
     CAZ101-104.

     High Wind Warning from 7 PM this evening to 3 AM PST Sunday for
     CAZ102-105-106-110-112.

NORTHWEST CALIFORNIA COASTAL WATERS...Storm Warning from 6 PM this evening to 4 AM PST Sunday for
     PZZ450-455-470-475.

     Hazardous Seas Warning until 6 PM PST this evening for PZZ450-
     455-470-475.

&&

$$

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