Marine Weather Net

San Juan Islands and Northern Inland Waters Marine Forecast


TODAY

S
WINDS
10 - 15
KNOTS

TONIGHT

SW
WINDS
5 - 10
KNOTS

FRI

S
WINDS
5 - 10
KNOTS

FRI NIGHT

SW
WINDS
5 KNOTS

The Marine Weather Forecast In Detail:
PZZ133 Forecast Issued: 208 AM PDT Thu May 23 2024

Today...S Wind 10 To 15 Kt, Easing To 5 To 10 Kt Late. Waves Around 2 Ft Or Less.
Tonight...Sw Wind 5 To 10 Kt. Waves Around 2 Ft Or Less. A Chance Of Showers After Midnight.
Fri...S Wind 5 To 10 Kt. Waves Around 2 Ft Or Less. A Chance Of Showers.
Fri Night...Sw Wind Around 5 Kt. Waves Around 2 Ft Or Less. A Chance Of Showers.
Sat...Sw Wind 5 To 10 Kt. Waves Around 2 Ft Or Less. A Chance Of Showers In The Morning.
Sat Night...Sw Wind 5 To 10 Kt. Waves Around 2 Ft Or Less.
Sun...S Wind 5 To 10 Kt. Waves Around 2 Ft Or Less. A Chance Of Showers.
Sun Night...Se Wind Around 5 Kt. Waves Around 2 Ft Or Less.
Mon...S Wind Around 5 Kt. Waves Around 2 Ft Or Less.
Mon Night...Sw Wind Around 5 Kt. Waves Around 2 Ft Or Less. A Chance Of Showers After Midnight.
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Area Forecast Discussion
National Weather Service Seattle WA
909pm PDT Wednesday May 22 2024

Synopsis
Weak high pressure will build aloft for drier and somewhat warmer conditions on Thursday. Another upper trough will move across Washington Friday into Saturday for cooler and unsettled conditions. Ridging will begin to build into the interior West next week for warming temperatures, but continued troughing offshore will allow for chance of precipitation.

Short Term - Tonight Through Saturday
Clouds and showers continue to diminish in coverage this evening as the occluded low across eastern Washington weakens. No major changes to the forecast this evening.

An upper low located across eastern Washington will continue to move southeastward tonight allowing for lingering showers over the Cascades to dissipate during this period. Weak high pressure aloft will briefly build in Thursday for slightly warming temperatures, generally drier conditions, and some sunshine. Troughing will develop Friday into Saturday for a return of unsettled conditions. Rain showers will increase into Friday morning for the coast, and then slowly move eastward through the day, but expected to remain generally light. Weak convergence may occur Friday night into early Saturday across central Puget Sound. Otherwise, temperatures will generally range in the upper 50s to low 60s Friday and Saturday.

Long Term - Sunday Through Wednesday
Ridging will begin to nudge into western Washington later Sunday into Monday, allowing for warming temperatures into next week. However, continued troughing offshore will allow for southwesterly flow aloft, leading to continued precipitation chances, mainly for the Olympic Peninsula and areas near the border during this period. Uncertainty increases in ensembles Tuesday in regards to the extent ridging builds into western Washington with troughing offshore. However, at least some troughing is expected to move across the Pacific Northwest later Tuesday into Wednesday, increasing precipitation potential. Normal to slightly above normal temperatures Monday into Tuesday, with perhaps some cooling for Wednesday.

Davis/JD

Marine
Seas around 8 to 10 ft offshore are maintaining SCA (Small Craft Advisory) headlines before they ease into the early overnight. Seas have dropped below 10 feet over the inner coastal waters and at Gray's Harbor Bar. Afterwards, conditions should trend more benign into the remainder of the night and Thursday. However, the next frontal system is expected to pass through area waters on Friday. This will likely bring another round of elevated seas and breezy winds.

Seas still hovering around 10 ft over the offshore coastal zones but are expected to decrease to 6 to 8 ft overnight before settling around 3 to 5 for both Thursday and during the day on Friday. Then, a NW wave train looks to arrive Friday night helping to increase seas to around 8-10 ft through early Saturday morning.

Davis/McMillian

NOAA Seattle WA Office: Watches - Warnings - Advisories
WA...None. PZ...Small Craft Advisory until 11pm PDT this evening 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.