Marine Weather Net

Cape Flattery to Cape Shoalwater WA between 60 and 150 NM Offshore Forecast


TONIGHT

NNW
WINDS
10 - 15
KNOTS

WED

NW
WINDS
10 - 15
KNOTS

WED NIGHT

NNW
WINDS
10 - 20
KNOTS

THU

NNW
WINDS
10 - 20
KNOTS

The Marine Weather Forecast In Detail:
PZZ800 Forecast Issued: 852 PM PDT Tue Apr 13 2021

Tonight...N To Nw Winds 10 To 15 Kt. Seas 4 To 5 Ft.
Wed...Nw Winds 10 To 15 Kt, Becoming 10 To 20 Kt. Seas 4 To 6 Ft.
Wed Night...N To Nw Winds 10 To 20 Kt. Seas 5 To 7 Ft.
Thu...N To Nw Winds 10 To 20 Kt, Diminishing To 5 To 15 Kt. Seas 4 To 6 Ft.
Thu Night...N To Nw Winds 5 To 10 Kt. Seas 4 To 5 Ft.
Fri...N Winds 5 To 10 Kt. Seas 5 To 6 Ft.
Fri Night...N Winds 10 To 15 Kt, Becoming Ne 5 To 15 Kt. Seas 5 To 6 Ft.
Sat...E To Ne Winds 5 To 15 Kt, Becoming E To Se. Seas 5 To 6 Ft.
Sat Night...S To Se Winds Less Than 10 Kt, Becoming Variable. Seas 4 To 6 Ft.
Sun...W Winds 5 To 10 Kt. Seas 4 To 5 Ft.
Sun Night...W To Nw Winds 5 To 15 Kt. Seas 4 To 5 Ft.
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819 PM PDT Tue Apr 13 2021
Northern and Central Washington Coastal and Inland Waters - PZZ100
Northerly offshore flow will continue through Wednesday. Winds will turn more easterly Thursday through Saturday.
Area Forecast Discussion
National Weather Service Seattle WA
815pm PDT Tuesday April 13 2021

The current forecast remains on track and changes are not planned for this evening.

SYNOPSIS...High pressure is over British Columbia with low pressure over California and Nevada. An upper ridge will build over British Columbia through the end of the week. The air mass will warm and temperatures will peak over the weekend with highs well into the 70s across the lowlands Friday through Sunday. Cooler weather will develop next week with a chance of showers as onshore flow develops.

SHORT TERM /TONIGHT THROUGH FRIDAY/...An upper ridge will build over British Columbia through Friday. Surface high pressure will remain over southwest Canada with thermally induced low pressure over California. Western Washington will remain in offshore flow with a dry air mass that will warm trough Friday. The outlying areas still got some frost this morning, but temps will warm considerably over the next few days. 19

Long Term - Saturday Through Tuesday
The upper ridge and offshore flow will keep warm sunny weather going into the weekend. The Northwest Avalanche Center will address conditions in the backcountry later this week as the mountains make the switch from a frozen winter snowpack to less stable spring conditions. High temps around Seattle over the weekend ought to be in the upper 70s--and a little warmer across southwest WA (and a notch cooler than that in the north and near the water). The daily high temp record for Sea- Tac for the 17th (which is Saturday) looks like the one to beat. Sunday will be just as warm, but that record is out of reach. After that, a return to occasionally damp weather and cool onshore flow is likely as the upper ridge gives out. 19

AVIATION...Northeast flow aloft through tonight with an upper ridge building offshore. VFR through the period. Breezy northerly winds into early tonight, sustained winds 10-20 knots with gusts 25-30 knots possible through this evening. Winds will diminish tonight.

KSEA...VFR through the period. Winds sustained 10 to 20 knots into early tonight, tapering to 5 to 10 knots into Wednesday morning. Gusts to 25-30 knots possible this afternoon. JD

MARINE...Offshore flow pattern continues through Wednesday with northerly flow as high pressure remains over the interior of the Pacific Northwest and Western Canada and a trough of low pressure resides along the Washington and Oregon Coasts. Small Craft northerly winds for the Northern Inland waters and Puget Sound into this evening, continuing for the coastal waters into tonight. Elsewhere, winds will be breezy over the waters but should remain 20kts or below.

Winds will ease again overnight into early Wednesday, but again expect winds to pick up out of the N/NE as offshore flow continues. A Small Craft Advisory will likely be needed for central and southern the Coastal Waters Wednesday afternoon and evening, with all other waters potentially remaining just below criteria. Although northerly/offshore flow will continue Thursday and Friday, winds currently look light over all waters. These conditions appear to carry through much, if not all, of the weekend.

Swells will remain below 10 ft over the next 7 days.

JD

Hydrology
River flooding not expected over the next 7 days.

.SEW 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 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.