Marine Weather Net

Cape Flattery to Cape Shoalwater WA between 150 and 250 NM Offshore Forecast


TODAY

ENE
WINDS < 10
KNOTS

TONIGHT

S
WINDS
5 - 15
KNOTS

TUE

S
WINDS
10 - 20
KNOTS

TUE NIGHT

N
WINDS
10 - 20
KNOTS

The Marine Weather Forecast In Detail:
PZZ900 Forecast Issued: 139 AM PST Mon Jan 18 2021

Today...E To Ne Winds Less Than 10 Kt, Becoming Variable, Then, Increasing To 5 To 15 Kt. Seas 10 To 17 Ft.
Tonight...S Winds 5 To 15 Kt, Increasing To 10 To 20 Kt. Seas 7 To 10 Ft.
Tue...S Winds 10 To 20 Kt, Becoming N To Nw 20 To 30 Kt. Seas 6 To 10 Ft.
Tue Night...N Winds 10 To 20 Kt. Seas 6 To 11 Ft. Chance Of Rain.
Wed...N Winds 10 To 20 Kt, Becoming N To Nw 5 To 15 Kt. Seas 9 To 11 Ft.
Wed Night...N To Nw Winds 10 To 20 Kt. Seas 8 To 11 Ft.
Thu...Nw Winds 15 To 25 Kt. Seas 8 To 12 Ft.
Thu Night...N Winds 20 To 30 Kt. Seas 10 To 14 Ft.
Fri...N Winds 15 To 25 Kt. Seas 10 To 13 Ft.
Fri Night...N Winds 15 To 25 Kt. Seas 9 To 11 Ft.
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249 AM PST Mon Jan 18 2021
Northern and Central Washington Coastal and Inland Waters - PZZ100
High pressure will remain over the waters through Wednesday. A front will dissipate just north of the area Tuesday night. A weak system will arrive Thursday with high pressure rebuilding again Friday.
Area Forecast Discussion
National Weather Service Seattle WA
303am PST Monday Jan 18 2021

Synopsis
High pressure aloft builds over the region and remains in place much of the first half of the week, though a weak front will clip the area late Tuesday. Another disturbance arrives Thursday. A stronger front likely arrives next weekend with cooler temperatures and lower snow levels.

.SHORT TERM /TODAY THROUGH WEDNESDAY/...High pressure and offshore flow will lead to dry conditions across western WA through Tuesday. Expect patchy low clouds and fog in the interior this morning with skies becoming partly sunny this afternoon. Highs will be close to normal in the mid to upper 40s. Lows will be chilly overnight and in the 30s. The ridge will flatten over WA on Tuesday while a weak trough cuts through B.C. This trough will clip western WA Tuesday night for a chance of light showers, mainly in the north interior and north Cascades. High pressure rebuilds on Wednesday for another dry day. 33

Long Term - Thursday Through Sunday
We'll see another round of showers on Thursday while a cool upper low tracks south down the coast. Precipitations amounts look light with just a few hundredths of an inch over the lowlands. However, snow levels will be low, around 1500-2000 ft, and could see a light rain/snow mix in areas near the Cascades. Cool northerly flow will prevail Friday and Saturday with temperatures trending below normal - highs in the lower to mid 40s and lows in the 20s to lower 30s.

The following system on Sunday shows some potential for lowland snow due to low snow levels (around 500-1000ft). Around half of the ECMWF (European Centre for Medium-Range Weather Forecasts) and GFS ensemble members show snow but amounts look spotty and light. NBM at Sea-Tac has a 60% chance of snow but only a 25% chance of seeing accumulations greater than an inch. It'll all depend on timing (snow levels, moisture, temperatures) which is all still uncertain. In any case, snow looks likely but impactful snow amounts seem low at the moment. The threat for more lowland snow continues into early next week as snow levels will remain low, with more systems headed our way. 33

Marine
High pressure will remain over the waters through Wednesday. A front will dissipate just north of the area Tuesday night. A weak system will arrive Thursday with high pressure rebuilding again Friday.

Small craft advisory today for the coastal waters and West Entrance to the Strait of Juan de Fuca for 10 to 12 foot swells. Swell subsiding tonight. Small craft advisory winds possible over the outer coastal waters Tuesday night behind dissipating front and again Thursday.

Hydrology
No river flooding is expected through the next seven days.

.SEW WATCHES/WARNINGS/ADVISORIES... WA...None. PZ...Small Craft Advisory until 6pm PST 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-West Entrance U.S. Waters Strait Of Juan De Fuca.