Marine Weather Net

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


15 - 25


5 - 15


15 - 25


TO 10

The Marine Weather Forecast In Detail:
PZZ131 Forecast Issued: 258 PM PDT Tue Jul 27 2021

Tonight...W Wind 15 To 25 Kt. Wind Waves 2 To 4 Ft.
Wed...W Wind 5 To 15 Kt Becoming 10 To 20 Kt In The Afternoon. Wind Waves 1 To 3 Ft.
Wed Night...W Wind 15 To 25 Kt. Wind Waves 2 To 4 Ft.
Thu...W Wind To 10 Kt Becoming 5 To 15 Kt In The Afternoon. Wind Waves 2 Ft Or Less.
Thu Night...W Wind 10 To 20 Kt. Wind Waves 1 To 3 Ft.
Fri...W Wind To 10 Kt Rising To 10 To 20 Kt In The Afternoon. Wind Waves 1 Ft Or Less Building To 1 To 3 Ft In The Afternoon.
Fri Night...W Wind 15 To 25 Kt. Wind Waves 2 To 4 Ft.
Sat...W Wind To 10 Kt Rising To 20 To 30 Kt. Wind Waves 1 Ft Or Less Building To 3 To 5 Ft.
Sun...W Wind 5 To 15 Kt. Wind Waves 2 Ft Or Less.
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258 PM PDT Tue Jul 27 2021
Northern and Central Washington Coastal and Inland Waters - PZZ100
High pressure offshore with thermal low pressure east of the Cascades will result in varying degrees of onshore flow for much of the upcoming week.
Area Forecast Discussion
National Weather Service Seattle WA
849pm PDT Tuesday July 27 2021

.UPDATE /TONIGHT THROUGH TUESDAY/... SYNOPSIS...Rising heigheights over the region as an upper level ridge shifts west will keep dry conditions with a warming trend - well above normal - through the weekend. The ridge will shift inland early next week with an upper trough moving in from the west and temperatures cooling to near normal.

SHORT TERM /TONIGHT THROUGH FRIDAY/...The upper level ridge over the Intermountain West will retrograde - shifting west and amplifying - Wednesday through Friday. Flow aloft over Western Washington will become more southerly which will help weaken the low level onshore flow resulting in less morning low clouds and helping boost temperatures. Friday looks to be the warmest day, with the warmest temperatures most likely South of Puget Sound and in some of the valleys near the Cascades. Ensembles showing a range of possible high temperatures most likely reaching into the upper 80s for the Seattle metro area - with low 90s possibility. The warmest locations - from Olympia southward could reach well into the 90s. The heat risk looks to peak in the moderate category on Friday with possible impacts for heat sensitive groups. It is also of note that guidance is indicating that overnight low temperatures particularly over the metro areas - may not dip below the 60s Thursday, Friday and Saturday nights. This can add to the impacts of warmer daytime temperatures. In addition to the warmer temperatures, the shift to more southerly flow aloft could also bring some elevated smoke to the area later in the week. At this time, this is expected to stay limited to the Cascades eastward and remain mostly aloft - so that impacts to air quality are not expected in Western Washington for now.

Long Term - Saturday Through Tuesday
Ensembles continue to show upper level heigheights gradually lowering as the the upper level ridge is nudged eastward again by a system in the Eastern Pacific/Gulf of Alaska. There is also the potential of some moisture coming up from the south Saturday night and Sunday for a slight chance of showers - the best chances for this over the Cascades, with the odd stray shower a bit further west. Ensembles to show some variability in the timing and manner of upper level ridge shifting eastward. Nonetheless, as the ridge shifts eastward, low-level onshore flow will ramp up helping return morning clouds and afternoon sunshine with more normal temperatures. The current forecast from the deterministic National Blend of Models forecast a middle of the road forecast with cooler temperatures Sunday and Monday.

AVIATION...from previous discussion...An upper ridge over the area through Wednesday night with southwesterly flow aloft and low level onshore flow. VFR cigs across the area this afternoon. Low clouds will spread inland tonight into Wednesday morning. LIFR/IFR cigs possible along the coast, and towards the Southwest Interior. IFR possible for the south Puget Sound near KOLM, and potentially along the Strait of Juan de Fuca areas in the morning. Clouds in these areas will clear for VFR in the afternoon. Northerly winds into tonight at 5 to 12 kts, with lighter winds tonight into the morning.

KSEA...VFR cigs through tonight. Northwest winds of 5 to 12 kts into early evening will become more northeasterly and a bit lighter tonight, transitioning more west-northwest Wednesday morning. JD

MARINE...from previous discussion...North winds through the next few days across most of the area. Small Craft Advisory winds over the next few nigheights through the central and eastern portions of the Strait of Juan de Fuca. SCA (Small Craft Advisory) winds possibly for the interior coastal waters Wednesday evening and Thursday evening with increasing north winds. Seas of 2 to 3 feet through Wednesday with mainly light westerly swells into Wednesday night. JD

.SEW WATCHES/WARNINGS/ADVISORIES... WA...None. PZ...Small Craft Advisory until 6am PDT Wednesday for Central U.S. Waters Strait Of Juan De Fuca-East Entrance U.S. Waters Strait Of Juan De Fuca.