James Island to Point Grenville WA out 10 to 60 NM Marine Forecast
5 - 15
5 - 15
15 - 25
20 - 30
10 - 20
|Today...Nw Wind 5 To 15 Kt Becoming W To 10 Kt In The Afternoon. Wind Waves 1 To 2 Ft. Nw Swell Around 10 Feet Dropping To 7 Feet Ft At 11 Seconds After 4 Am. A Chance Of Showers.|
|Tonight...S Wind To 10 Kt Becoming Se 5 To 15 Kt After Midnight. Wind Waves 1 To 2 Ft. W Swell 5 Ft At 11 Seconds. A Chance Of Showers.|
|Mon...Se Wind 5 To 15 Kt Becoming E 10 To 20 Kt In The Afternoon. Wind Waves 2 To 4 Ft. W Swell 4 Ft At 10 Seconds. A Chance Of Showers.|
|Mon Night...Ne Wind 15 To 25 Kt Rising To 20 To 30 Kt After Midnight. Wind Waves 2 To 4 Ft Building To 4 To 6 Ft After Midnight. W Swell 4 Ft At 9 Seconds Becoming S 5 Ft At 9 Seconds After Midnight.|
|Tue...Ne Wind 20 To 30 Kt Easing To 15 To 25 Kt In The Afternoon. Wind Waves 4 To 6 Ft. S Swell 7 Ft At 8 Seconds.|
|Tue Night...Ne Wind 10 To 20 Kt Becoming 5 To 15 Kt After Midnight. Wind Waves 1 To 3 Ft. S Swell 7 Ft At 10 Seconds.|
|Wed...N Wind 5 To 15 Kt Becoming Nw 10 To 20 Kt. Wind Waves 1 To 3 Ft. Sw Swell 5 Ft Becoming W.|
|Thu...W Wind 5 To 15 Kt. Wind Waves 1 To 3 Ft. Nw Swell 6 Ft Subsiding To 4 Ft.|
| Area Forecast Discussion|
National Weather Service Seattle WA
340am PDT Sunday Mar 26 2023
Upper level troughing over the region will keep conditions cool and showery today, before conditions dry out on Monday. Overall drier and warmer conditions are expected the first half of the week, with temperatures expected to approach the low 60s by Wednesday. An active pattern returns late in the week as another weather system moves into the region and brings wetter conditions, cooler temperatures, and lowering snow levels.
Short Term - Today through Tuesday
Upper level troughing persists over western Washington this morning, with latest radar showing shower activity continuing along the coast and coastal waters. Current temperatures as of 2AM/09Z are in the 30s for the majority of the area. Expect morning lows to get down to near freezing in spots, especially south of the Sound along the Chehalis River Valley. Could still see some pockets of a rain/snow mix, or even a brief transition to snow, in heavier shower activity for areas south of Puget Sound through the early morning hours given near freezing temperatures and lowering snow levels overnight.
The upper level trough will continue to influence the region today, but is expected to push south and east of the area this evening. Shower activity will continue through the day, increasing in coverage with a vort max situated just along the coast. Temperatures will remain cooler than normal and only look to top out in the mid to upper 40s for the majority of the area.
A strong closed low will then drop southward into the region from Haida Gwaii late tonight into Monday morning and looks to continue to track southward, well offshore, throughout the day. Flow will transition to offshore and confidence remains high that the bulk of the moisture associated with this system will remain to the west and south of western Washington, making for a primarily dry day across the region. The only exception would be the Cascades, where upslope flow may spark some shower activity east of the crest that may drift westward. Overall, expect conditions to dry out and for temperatures to rebound into the mid 50s.
The closed low will then sink further towards the northern CA coast Monday night into Tuesday. Some wrap-around moisture may brush the southern portion of the forecast area heading into Tuesday, so have kept a mention for a slight chance of POPs for Lewis, Grays Harbor, Thurston, and Pierce counties. That said, however, expect the majority of areas to remain dry and for temperatures to continue to climb a few degrees from Monday's highs - likely topping out in the upper 50s to near 60. 14
Long Term - Wednesday Through Saturday
Weak upper level ridging looks to nudge into the region on Wednesday as the aforementioned upper low continues to track southward along the CA coast. Wednesday looks to be the nicest day of the week- with ample sunshine and afternoon highs expected to climb into the low to mid 60s for the majority of the area.
A shortwave trough then looks to drop down into the region on Thursday, however moisture continues to look limited. Nonetheless, this feature may spark a few showers across the region, with the most favorable spots being along the coast and across any higher terrain.
A switch back to wetter and cooler conditions looks likely late in the week as a more organized frontal system approaches the region Friday morning and brings with it more widespread rain, mountain snow, and the return of cooler temperatures. Mountain snow may be heavy at times with snow levels likely dropping below the passes. 14
Northwesterly swell over the offshore and coastal waters has dropped below 10 feet, thus the Small Craft Advisory for these areas will expire on time at 4 AM. Otherwise, light northwest flow over the coastal waters and southerly flow over the inland waters today with weak high pressure keeping winds light. A surface low will dig southward offshore Monday, moving toward the Northern California Coast by Tuesday night. Offshore flow will develop Monday into Tuesday with growing confidence for at least advisory-level wind gusts across the coastal and offshore waters in addition to the Strait of Juan de Fuca. Though seas build with increasing wind waves and fresh swell with offshore flow Monday night into Tuesday, combined seas should remain below 10 feet through the upcoming week.
No river flooding expected in the next 7 days.
NOAA Seattle WA Office: Watches - Warnings - Advisories
WA...None. PZ...Small Craft Advisory until 4am PDT early this morning 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
Grays Harbor Bar.