Point Grenville to Cape Shoalwater WA out 10 to 60 NM Marine Forecast
|Tonight...W Wind 25 To 35 Kt. Combined Seas 20 To 23 Ft With A Dominant Period Of 14 Seconds. A Chance Of Showers.|
|Fri...Nw Wind 30 To 35 Kt Becoming 25 To 35 Kt In The Afternoon. Combined Seas 22 To 25 Ft With A Dominant Period Of 15 Seconds. A Chance Of Showers.|
|Fri Night...Nw Wind 25 To 35 Kt Becoming 25 To 30 Kt After Midnight. Combined Seas 19 To 22 Ft With A Dominant Period Of 13 Seconds. A Slight Chance Of Showers.|
|Sat...Nw Wind 20 To 30 Kt Easing To 15 To 25 Kt In The Afternoon. Wind Waves 3 To 5 Ft. Nw Swell 19 Ft At 12 Seconds Subsiding To 15 Ft At 12 Seconds In The Afternoon.|
|Sat Night...W Wind 10 To 20 Kt Becoming Sw 5 To 15 Kt After Midnight. Wind Waves 1 To 3 Ft. Nw Swell 11 Ft At 12 Seconds.|
|Sun...Sw Wind 15 To 25 Kt. Wind Waves 2 To 4 Ft. Nw Swell 8 Ft At 11 Seconds.|
|Sun Night...S Wind 15 To 25 Kt Becoming 15 To 20 Kt After Midnight. Wind Waves 2 To 4 Ft. W Swell 7 Ft At 12 Seconds.|
|Mon...W Wind 15 To 20 Kt Becoming Nw 10 To 20 Kt. Wind Waves 1 To 3 Ft. W Swell 9 Ft.|
|Tue...W Wind 5 To 15 Kt. Wind Waves 2 Ft Or Less. W Swell 11 Ft.|
| 807 PM PST Thu Feb 25 2021 |
Northern and Central Washington Coastal and Inland Waters - PZZ100
Strong onshore flow will produce hazardous winds and seas across the coastal and inland waters through Friday. Conditions will improve over the weekend as high pressure builds across the waters.
| Area Forecast Discussion|
National Weather Service Seattle WA
836pm PST Thu Feb 25 2021
The forecast remains on track this evening with no changes planned. Water vapor imagery this evening depicts broad cyclonic flow extending from the far NE Pacific and into the Western US, while at the surface, high pressure continues to nose into the Pacific Northwest off the Pacific, with this morning's cold front now located across Eastern WA and through Northern California.
Scattered showers continue across the area this evening amidst a marginally unstable environment. Despite favorable placement of the left exit region of a 300mb jet streak and cold mid level temperatures, the lack of surface heating and meager lapse rates prevented the development of thunderstorms today, and the threat will remain minimal through the overnight hours. For tonight, can expect shower coverage to taper some through about midnight as mid level heigheights attempt to rise between shortwave troughs. After midnight, shower coverage is expected to increase as a shortwave rapidly dives south through the area from Haida Gwaii and central BC Coast vicinity. These showers will likely continue until daybreak where the shortwave will then continue its journey south of the area. Will still see some shower activity across the area on Friday as favorable jet dynamics and an unstable environment continue. There is some evidence of some convergence zone type features developing again Friday afternoon, which may bring some heavy snow to the mountains through Saturday morning.
A high wind warning will remain in effect through 10AM Friday for the Admiralty Inlet area as strong west winds continue down the Strait of Juan de Fuca (See NPWSEW). Swells will also increase offshore to between 20-25 feet overnight and into Friday morning, bringing high surf conditions to the Coast. Previous discussion follows with an updated aviation section.
A cool showery air mass will remain over Western Washington through Friday. Strong onshore flow and westerly winds aloft will give the mountains periods of heavy snow. A break in the weather will come Saturday followed by weaker weather systems and a chance of rain at times into next week.
Short Term - Tonight Through Sunday
Strong onshore flow will persist tonight and Friday. The air is somewhat unstable and there are PSCZ showers from the north part of Hood Canal east through southern Snohomish and northern King county. It hasn't been all that convective however, radar shows tops around 16kft at 2pm, so the chance for a tstm is probably negligible. A winter storm warning is up for the Cascades and orographically enhanced periods of heavy snow will make for wintry pass conditions with blowing snow and poor visibility at times. Snowfall rates today were not really all that impressive, but there is a good chance that it will pick up tonight into Friday morning and h850 winds should get up around 50kts. Gale westerlies are blowing in the Strait of Juan de Fuca and a high wind warning is up for Whidbey Island/Admiralty Inlet area.
The showers will decrease later Friday and Friday night and for the lowlands there should be more sunbreaks Friday afternoon. Saturday should be a decent day, dry, light winds, and some sunshine. As we get into Saturday night and Sunday the chance for rain will increase again ahead of the next weather system. 19
Long Term - Monday Through Thursday
A front will probably move through Western Washington Monday morning, and then another system will reach the area Tuesday and Wednesday while a bit of a ridge tries to build. The models are not in agreement at all (GFS mostly dry, Euro and Canadian mostly wet) so all that can be done for now in the extended forecast is too keep a chance of rain through the period, waiting for the models to converge. 19
Strong post frontal onshore flow continuing into Friday. Gale warnings are up for a majority of the waters. Winds ease late Friday into Friday night. Weak high pressure will build over the waters on Saturday for lighter winds. A weakening front will brush the area on Sunday. Coastal swell increase tonight in the 20 to 22 foot range. Seas in the low 20 foot range will continue until late Friday afternoon before gradually subsiding over the weekend. 27
Flooding is not expected over the next 7 days.
.SEW WATCHES/WARNINGS/ADVISORIES... WA...Winter Storm Warning until 10pm PST Friday for Cascades of Pierce and Lewis Counties-Cascades of Snohomish and King Counties-Cascades of Whatcom and Skagit Counties.
High Surf Advisory until 4pm PST Friday for Central Coast-North Coast.
High Wind Warning until 10am PST Friday for Admiralty Inlet Area.
Winter Weather Advisory until 10am PST Friday for Olympics.
PZ...Small Craft Advisory until 4pm PST Friday for Grays Harbor Bar- Puget Sound and Hood Canal.
Gale Warning until 10am PST Friday for Admiralty Inlet-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.
Gale Warning until 4pm PST Friday for Central U.S. Waters Strait Of Juan De Fuca-East Entrance U.S. Waters Strait Of Juan De Fuca-West Entrance U.S. Waters Strait Of Juan De Fuca.
Gale Warning until 10pm PST this evening for Northern Inland Waters Including The San Juan Islands.