Area Forecast Discussion
Issued by NWS Eureka, CA

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000
FXUS66 KEKA 231231 AAA
AFDEKA

AREA FORECAST DISCUSSION...updated
National Weather Service Eureka CA
512 AM PDT Fri Jun 23 2017

.SYNOPSIS...Inland heat will continue for the next few days, with
relief expected to arrive early next week. Isolated thunderstorms
will be possible across the interior on Sunday afternoon.

&&

.DISCUSSION...Early morning GOES-16 imagery shows that a
southerly surge of stratus and fog has made it all the way to Cape
Mendocino. The RAP model has a very good handle on this
progression and it, along with the HRRR wind field, shows it
rounding the cape before the S surge drops off in intensity. The
HRRR does develop a weak low offshore the Redwood Coast this
afternoon which should act to push the clouds farther up the
coast. Any clouds that do make it to coastal beaches will likely
not push too far inland do to strong inland mixing. Nighttime and
morning coastal clouds will become more prevalent over the next
few days, but improvement should be noted by each afternoon.

Hot inland temperatures will continue through the weekend, but
readings should be a bit lower than on Thursday due to a pinching
of the upper ridge over the area. Warm Redwood Coast temperatures
are possible again today, although the aforementioned clouds and
marine layer will bring a tight temperature gradient in the
coastal plain. There are indications that downsloping flow from
the NW may persist for portions of coastal Del Norte County. In
addition, the thickest coastal clouds are expected to mostly
remain just to the S of this area. This will make the temperature
forecast tricky. Have gone a few degrees over model guidance for
highs there today.

As coastal clouds increase, there is the potential for some patchy
drizzle along the Redwood Coast, particularly Sunday and Monday
mornings. Increased moisture and instability may lead to isolated
thunderstorms over the interior this weekend. Have left Saturday
PoPs silent (around 10%). Have continued isolated thunder over
portions of Trinity and NE Mendocino counties on Sunday afternoon.
Convective inhibition (CIN) will be fairly high, but a weak
shortwave will be passing over the area from SW to NE during the
afternoon. This may be enough of a boost in lift to promote shower
or thunderstorm development over some ridgetops.

Less inland heat is expected early next week, but temperatures
will rise once again by mid-week to about 5 to 10 degrees above
normal. /SEC

&&

.AVIATION...CEC and ACV have had sporadic visibility reductions
this morning due to sea spray/haze/mist. Expect to continue to see
these sporadic visibility reductions throughout the early morning
however will not go with IFR visibilities as models suggest but
rather stick with MVFR visibilities. Later this morning expect
conditions to go to VFR at all three airports. While a stratus
surge from the south is currently ongoing do not expect this
stratus deck to make it into ACV or CEC until late this evening.
/WCI

&&

.MARINE...Winds will quickly diminish from south to north early this
morning as a shifting surface low allows the pressure gradient to
relax across the coastal waters. Winds will be light to gentle and
generally out of the south this weekend. Expect some stronger south
winds near Cape Mendocino which should result in a light chop. Light
to gentle winds will continue through early next week before high
pressure builds offshore. This will pinch the gradient, once again,
bringing fresh northerlies to the waters for the middle of next
week. Gusts during this time are forecast to reach near 30 kt across
the outer waters. Steep waves, today, will be slower to subside but
should continue this trend through the day with quite low seas
expected into the weekend. Low seas should persist through the
weekend with steep conditions taking over as north winds increase
next week. /KML

.COASTAL/SURF...Tidal anomalies were running around .6 to .7 feet
during yesterday evening`s high tide. Astronomical tides are running
high as well, so the actual tide rose to around 8.8 feet. This is
the level at which some flooding is reported in King Salmon. The
predicted high tide late this evening is expected to be a bit higher
than Thursday evening`s. We`ll continue to monitor the anomalies for
a possible Coastal Flood Advisory. /SEC

&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...Heat Advisory until 8 PM Saturday for CAZ102-105>108-110-111-113.

NORTHWEST CALIFORNIA COASTAL WATERS...
     Small Craft Advisory until 9 AM this morning for PZZ450-475.
     Gale Warning until 9 AM PDT this morning for PZZ470.

$$

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