Marine Weather Net

Cape Flattery to James Island WA out 10 NM Marine Forecast


TONIGHT

N
WINDS
5 - 15
KNOTS

MON

N
WINDS
TO 10
KNOTS

MON NIGHT

NW
WINDS
TO 10
KNOTS

TUE

S
WINDS
TO 10
KNOTS

The Marine Weather Forecast In Detail:
PZZ150 Forecast Issued: 251 PM PDT Sun Sep 25 2022

Tonight...N Wind 5 To 15 Kt. Wind Waves 1 To 2 Ft. W Swell 4 Ft At 10 Seconds.
Mon...N Wind To 10 Kt Becoming Nw In The Afternoon. Wind Waves 1 Ft. W Swell 3 Ft At 10 Seconds.
Mon Night...Nw Wind To 10 Kt In The Evening Becoming Light. Wind Waves 1 Ft. W Swell 3 Ft At 9 Seconds. Patchy Fog After Midnight.
Tue...Light Wind Becoming S To 10 Kt In The Afternoon. Wind Waves 1 Ft. W Swell 3 Ft At 10 Seconds.
Tue Night...S Wind 5 To 15 Kt. Wind Waves 1 To 2 Ft. W Swell 4 Ft At 11 Seconds.
Wed...Se Wind 5 To 15 Kt. Wind Waves 1 To 2 Ft. Sw Swell 7 Ft At 11 Seconds.
Wed Night...S Wind 5 To 15 Kt Becoming To 10 Kt After Midnight. Wind Waves 1 To 2 Ft. W Swell 10 Ft At 10 Seconds.
Thu...Nw Wind To 10 Kt. Wind Waves 1 Ft. W Swell 8 Ft Subsiding To 6 Ft.
Fri...N Wind To 10 Kt. Wind Waves 1 Ft. W Swell 4 Ft.
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Area Forecast Discussion
National Weather Service Seattle WA
326pm PDT Sunday September 25 2022

Synopsis
An upper level ridge will remain over the region through at least Tuesday with very warm and dry conditions expected to continue. Light offshore flow through Monday or Tuesday, with elevated to critical Elevated fire weather concerns Monday as light offshore flow develops. The next disturbance approaches midweek, with the following frontal system bringing cooler and cloudier conditions along with renewed rain chances.

.Short Term - Tonight through Wednesday
Latest satellite imagery reveals not much in the way of cloud cover, as the only notable clouds are a band of passing cirrus rotating around an upper low parked off the central portion of the Oregon coast this afternoon. However, increased smoke output on some local fires, coupled with offshore flow, has led to a noted haze spreading west from the mountains and over much of the Puget Sound region this afternoon. With high pressure aloft and light offshore flow, expect some of this to continue into Monday and smoke may be more prominent again toward daybreak under the inversion.

Expect a slight warming trend Monday, with temperatures in the low 80s across much of the interior and evening into at least the lower 70s again for the coast (perhaps even the mid 70s if the offshore flow holds on enough to prevent much of a sea breeze). Meanwhile, relative humidities near the Cascades will again plunge to critical levels with only poor overnight recoveries. See the fire weather section for more details. Some additional mid-level clouds are possible late Monday associated with the low offshore as it lifts north, and again smoke from several area fires may again contribute to haze and diminished visibility. Little change into Tuesday, with only a slightly cooler air mass as the ridge advances east and heigheights begin to fall as the next low approaches. Expect the next front to reach the coastline late Tuesday evening before spreading onshore early Wednesday. This will bring a much deeper push of clouds into the interior along with a return of rain chances. Rain amounts aren't too impressive, with generally up to a tenth of an inch inland and closer to a quarter inch along the coast and in the Olympics and perhaps across the Cascades. Confidence in a wetting rain is lower in the Cascades, however, due to the front weakening as it pushes

Long Term - Thursday Through Sunday
Expect some lingering showers into Thursday behind the front as moisture wraps back around the trough, before another shortwave ridge gives a little break for Friday. Looking ahead to next weekend, temperatures likely trend back to near seasonal normals with another front possibly approaching just in time for the start of October. While the ensembles continue to display some variability with respect to how robust this front may be (and accordingly, how widespread and/or heavy the precipitation may be), attention is turning to the broad upstream trough developing over the NE Pacific in the early stages of next week. Ensemble cluster analysis continues to suggest some spread in how deep this trough may be, but with most guidance favoring its development, it may be only a question of when a stronger front will reach the region to bring a widespread

Marine
Northerly flow will prevail over the area waters through Monday with high pressure situated offshore. An onshore push will develop Monday afternoon and evening along the central and eastern Strait of Juan de Fuca, though winds look to remain just below Small Craft Advisory thresholds at 10-20 kt. A frontal system will cross the Coastal Waters Tuesday night and shift inland on Wednesday, resulting in a stronger push of westerlies down the Strait. Moderate onshore flow will follow on Thursday, before flow turns more offshore again Friday into the weekend.

Seas across the coastal waters continue to persist at 4-6 ft this afternoon. Seas look to subside to 2-4 ft tonight and persist at this level through the early part of the week. Seas then look to build to 10 ft near midweek. 14

Fire Weather
Light offshore flow will develop late tonight into Monday, which will elevate fire weather conditions. A red flag warning has been issued for the Cascades Monday afternoon and early evening for the combination of critical RHs and unstable conditions. A switch to onshore flow on Tuesday will boost daytime RHs just enough to avoid any further fire weather concerns in the lowlands. Fire weather concerns will remain elevated in the Cascades Tuesday especially near the crest as conditions remain dry and unstable. A passing front on Wednesday will bring an end to fire weather concerns across the area for a couple of days. Warmer weather returning next weekend with low level offshore flow for another round of elevated fire weather conditions.

Hydrology
The daily hydrology discussion has ended until the start of the next rainy season; it will only be updated as needed.

NOAA Seattle WA Office: Watches - Warnings - Advisories
WA...Red Flag Warning from noon to 7pm PDT Monday for West Slopes of the Central Cascades Generally above 1500 Feet-West Slopes of the North Cascades Generally above 1500 Feet.

PZ...None.