Marine Weather Net

James Island to Point Grenville WA out 10 NM Marine Forecast


TODAY

SE
WINDS
15 - 25
KNOTS

TONIGHT

SE
WINDS
5 - 15
KNOTS

THU

NE
WINDS
10
KNOTS

THU NIGHT

NW
WINDS
5 - 15
KNOTS

The Marine Weather Forecast In Detail:
PZZ153 Forecast Issued: 243 AM PDT Wed Sep 28 2022

SMALL CRAFT ADVISORY IN EFFECT FROM 8 AM PDT THIS MORNING THROUGH THIS AFTERNOON
Today...Se Wind 15 To 25 Kt. Wind Waves 2 To 4 Ft. Sw Swell 5 Ft At 11 Seconds. Rain Likely.
Tonight...Se Wind 5 To 15 Kt Becoming E To 10 Kt After Midnight. Wind Waves 1 To 2 Ft. Sw Swell 9 Ft At 11 Seconds. A Chance Of Rain.
Thu...Ne Wind To 10 Kt Becoming Nw 5 To 15 Kt In The Afternoon. Wind Waves 1 To 2 Ft. Sw Swell 5 Ft At 9 Seconds. A Slight Chance Of Showers In The Morning.
Thu Night...Nw Wind 5 To 15 Kt. Wind Waves 1 To 2 Ft. Sw Swell 4 Ft At 8 Seconds.
Fri...N Wind 5 To 15 Kt. Wind Waves 1 To 2 Ft. W Swell 3 Ft At 8 Seconds.
Fri Night...N Wind 5 To 15 Kt Easing To 10 Kt After Midnight. Wind Waves 1 To 2 Ft. W Swell 4 Ft At 8 Seconds.
Sat...N Wind To 10 Kt Rising To 5 To 15 Kt. Wind Waves 1 To 2 Ft. W Swell 4 Ft.
Sun...N Wind To 10 Kt. Wind Waves 1 Ft. W Swell 5 Ft.
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Area Forecast Discussion
National Weather Service Seattle WA
244am PDT Wednesday September 28 2022

Synopsis
A frontal system will move through the area today with cooler temperatures and a chance for rain. Showers will taper on Thursday as an upper trough exits. High pressure will rebuild over the area late in the week for another stretch of dry and warmer weather this weekend and into early next week.

Short Term - Today through Friday
High clouds continue to cover W WA this morning and while satellite is having trouble seeing it, there's also some low clouds sneaking into the area as far east as the South Sound. The back edge of the front still remains out over the outer coastal waters. Switching to radar, some showers have already made it to the coastline with the main band still hanging out just a touch eastward of the aforementioned rear of the front.

That front will continue to move eastward today, crossing the CWA (County Warning Area) as it does so. Models put this feature on the coast around 12Z /5am PDT/ and not reaching the Seattle Metro area until closer to 14 or 15Z /7 or 8am PDT/. Solutions consistent in showing that the front breaks up as it moves eastward while the SE trajectory of the parent upper low will help to ensure that the best chance for precipitation both today and Thursday will be over southern portions of the area south of Seattle.

The upper level low crosses the area Thursday allowing for some wrap around moisture to trigger some showers, again favoring the SE quarter of the CWA. By Thursday evening, the low pulls far enough away where W WA then falls under the influence of the upper level ridge building over the Pacific. This feature nudges inland during the overnight hours and is set to dominate the weather landscape throughout the day Friday.

Temps today look to fall right in line with seasonal normals while as soon as Thursday we warm up a couple of degrees returning W WA to above normal temperatures. By the time the upper ridge sets up for Friday, the area will already be around 5 degrees above normal, returning high temperatures to familiar territory. 18

Long Term - Saturday Through Tuesday
The bright side of an upper level ridge lingering over the west coast for the remainder of the forecast period is that it makes this part of the discussion very short, as warm and dry conditions will remain in place for the remainder of the forecast period. High temps during this timeframe remain pretty static with most lowland locations getting into the mid to upper 70s with some SW interior locations getting into the lower 80s. The downside being that this would keep temperatures anywhere from 10 to 15 degrees above normal with no prospect for precip. 18

Marine
Latest surface analysis this morning depicts a frontal boundary approaching the Outer Coast Water zones, with higher pressure over the remaining marine zones. Low cloud cover is spreading across all marine zones this morning ahead of the front, with rain affecting most of the coastal and offshore waters. Winds are breeziest over the Outer Coastal waters, with all other zones experiencing light winds. The front will weaken as it pushes inland today, with rain becoming more scattered. Winds will remain breezy enough over all Coastal Water zones to warrant a low-end SCA. Winds will relax later this evening. Thereafter, expect light winds through the remainder of the week and the upcoming weekend across all waters.

Swells will increase in association with the frontal boundary today, generally to between 7-9ft. Seas will ease later tonight and into Thursday generally ranging from 3-5 ft through the weekend.

Hydrology
The daily hydrology discussion has ended until the start of the next rainy season; it will only be updated as needed.

NOAA Seattle WA Office: Watches - Warnings - Advisories
WA...None.

PZ...Small Craft Advisory from 8am this morning to 5pm PDT this afternoon for
Coastal Waters From Cape Flattery To James Island Out 10 Nm-
Coastal Waters From James Island To Point Grenville Out 10 Nm-
Coastal Waters From Point Grenville To Cape Shoalwater Out 10 Nm.

Small Craft Advisory until 5pm PDT this afternoon for
Coastal Waters From Cape Flattery To James Island 10 To 60 Nm-
Coastal Waters From James Island To Point Grenville 10 To 60 Nm-
Coastal Waters From Point Grenville To Cape Shoalwater 10 To 60 Nm.