Marine Weather Net

Central U.S. Waters Strait of Juan de Fuca Marine Forecast


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The Marine Weather Forecast In Detail:
PZZ131 Forecast Issued: 840 AM PST Sun Feb 28 2021

Today...Light Wind Becoming Ne To 10 Kt In The Afternoon. Wind Waves 2 Ft Or Less. A Slight Chance Of Rain In The Morning.
Tonight...Nw Wind To 10 Kt Becoming Variable After Midnight. Wind Waves 1 Ft Or Less.
Mon...Sw Wind To 10 Kt Becoming W In The Afternoon. Wind Waves 1 Ft Or Less. A Chance Of Rain.
Mon Night...W Wind 5 To 15 Kt. Wind Waves 2 Ft Or Less.
Tue...Sw Wind To 10 Kt. Wind Waves 1 Ft Or Less.
Tue Night...Variable Wind To 10 Kt In The Evening Becoming Light. Wind Waves 1 Ft Or Less.
Wed...Se Wind To 10 Kt. Wind Waves 1 Ft Or Less.
Thu...Se Wind 10 To 20 Kt. Wind Waves 1 To 3 Ft.
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840 AM PST Sun Feb 28 2021
Northern and Central Washington Coastal and Inland Waters - PZZ100
A warm front lifts across the waters this morning. A pair of weak fronts approach the waters Monday and Wednesday, with modest onshore flow developing behind each. A stronger front may enter the coastal waters late in the week.
Area Forecast Discussion
National Weather Service Seattle WA
840am PST Sunday Feb 28 2021

Few changes to the forecast for today. Areas of light drizzle continue to linger across parts of Western Washington at this hour. Expecting drizzle to gradually decrease in coverage this afternoon and the shortwave ridge axis located along the northwest coast moves inland this afternoon ahead of the next upper trough digging out of the Gulf of Alaska. Mostly cloudy skies will likely persist through the remainder of the day as mid level stratus remains locked in place over Western Washington. Little in the way of mixing expected as the air column is saturated from the surface through ~800mb this morning per the 12Z KUIL RAOB.


SYNOPSIS...Western Washington will remain in an unsettled weather pattern for the next seven days. We will experience periods of lowland rain and mountain snow. Temperatures are expected to be near the seasonal norms, but there is the potential for some above average highs late in the week.

SHORT TERM /TODAY THROUGH TUESDAY/...Currently (at 0200 AM) rain from the tail end of a weak warm front is moving through the area. These rain showers are relatively light in nature and will be tapering off through the early morning hours. However, the lower levels of the atmosphere will remain rather moist so some low clouds and possibly fog are expected by daybreak. Clouds will likely stick around through the day.

Rain and mountain snow are expected to make their return to the area late Monday morning/early afternoon. As some upper air disturbances travel over Western Washington through Wednesday. With the bulk of the moisture associated with the low well to our southwest we are only expecting off and on light rain showers and mountain snow. In summary, expect damp conditions over the next few days. But on the bright side those damp conditions will be at slightly warmer temperatures compared to what we have been experiencing. For the interior lowland areas highs will be in the low to mid 50s, with only slightly cooler conditions at the coast.

Long Term - Wednesday Through Saturday
Not much will be changing for the start of the long term with light rain showers possible on Wednesday as a warm front moves through. Once that moves through it is looking like we will be warming up for Thursday with highs near 60 in the lowlands. These warmer temperatures won't stick around for too long as a more organized cold front is expected at the end of the week. Some more steady widespread rain is likely as this front moves through. And by the weekend we should return to the more seasonable temperatures with highs in the low 50s.


AVIATION...Westerly flow aloft today as warm front dissipates over the region and weak upper ridge axis shifts east of the Cascades. The air mass remains relatively moist and stable. Low MVFR (Marginal Visual Flight Rules) and pockets of IFR will linger into this afternoon. A gradual improvement in ceilings is expected tonight as the low level flow turns weakly offshore and allows for some drying.

KSEA...Mostly MVFR (Marginal Visual Flight Rules) ceilings through the day with low end VFR possible near or after 00Z. Surface winds southerly less than 10 knots becoming southeasterly tonight.


MARINE...Weak surface low pressure moves across the waters early today, with low-end advisory strength winds (especially gusts) becoming more widespread over the waters by afternoon and into early tonight. A pair of weak fronts likely reach the waters around Monday and Wednesday, with modest onshore flow following each. A stronger front may arrive around Thursday or Friday, though confidence on the strength and timing remains relatively low.

Seas over the coastal waters have fallen below 10 ft. Expect a slight increase in seas with each front that arrives this week, with the potential for combined seas to build closer to 15 ft later in the week.


Rainfall amounts will remain light through most of this week, therefore river flooding is not expected. While a flooding threat is not currently in the forecast for late week/next weekend, will need to monitor the pattern as a period of southwesterly flow is possible.

.SEW WATCHES/WARNINGS/ADVISORIES... WA...None. PZ...Small Craft Advisory until 4am PST Monday for Coastal Waters From Cape Flattery To James Island 10 To 60 Nm-Coastal Waters From Cape Flattery To James Island Out 10 Nm-Coastal Waters From James Island To Point Grenville 10 To 60 Nm- Coastal Waters From James Island To Point Grenville Out 10 Nm-Coastal Waters From Point Grenville To Cape Shoalwater 10 To 60 Nm-Coastal Waters From Point Grenville To Cape Shoalwater Out 10 Nm.

Small Craft Advisory until 6pm PST this evening for Northern Inland Waters Including The San Juan Islands.

Small Craft Advisory until 7pm PST this evening for Admiralty Inlet-Puget Sound and Hood Canal.