Marine Weather and Tide Forecast for Bryn Mawr-Skyway, WA

SYNOPSIS
An upper level low will remain off the British Columbia coast for much of the forecast period. Dry conditions and seasonable temperatures this weekend with diminishing cloud cover. A series of weak fronts will bring the chance for rain back to the area Monday, with best chances on Tuesday. Dry conditions will resume Wednesday and into late next week.

SHORT TERM /TONIGHT THROUGH MONDAY/
Upper level analysis shows an upper level low just off the coast of northwest B
C
The flow aloft is southwest as a couple of weak troughs swing around the low today/early Saturday. No significant weather is expected with these troughs (other than there will remain a few more clouds today with clearing expected to be minimal over most of western WA,except for along and north of the Strait of Juan de Fuca). As such, highs will remain cool with some areas remaining in the 50s (some urban areas and areas clear will have the best chance of seeing temps creep up into the 60s). Conditions will be dry regionwide (though could be a few sprinkles in the Cascades this afternoon).

Over the weekend: Down at the surface, high pressure will build offshore with lower heights further inland to the east. This will keep the flow onshore with light west to northwest winds at the surface. There will be a descent push of marine air tonight/Saturday morning (which will push most clouds back in across the region). Once the weak trough passes through, clouds will clear out going into Saturday afternoon and it will remain dry through the weekend. Sunday will be sunnier compared to Saturday with not as significant of a marine push Sunday morning.
Highs will be a touch warmer Saturday/Sunday with the clearer skies - will peak Sunday with temps reaching upper 60s to mid 70s (warmest temperatures from metro Seattle south along the I-5 corridor). Lows will remain comfortable with a few more low 50s Sunday night (otherwise lots of 40s and potentially a few South Interior locations getting close to dropping in the 30s Sunday morning).

By Monday, another shortwave trough and weak front will approach from the west, and begin to increase the chance of showers Monday afternoon/evening along the coast. Amounts are expected to be light. Cloud coverage will remain partly cloudy/sunny through Monday with clouds increasing along the coast. Temperatures are expected to remain steady from Sunday.

LONG TERM /TUESDAY THROUGH FRIDAY/
The low offshore will remain in place through much of next week. It does not appear (based on ensembles) that it will move inland until Friday of next week. The front/trough approaching Monday will continue into Tuesday with shower chances increasing across the region Tuesday into Wednesday. Amounts at this time will be light (hit or miss showers expected). There is also a 10-15% chance of thunder in the north (Whatcom County), however at this point, the best chance of thunder is over the border into Canada (but this may shift as more guidance comes in). Another round of showers is possible Friday as the low is expected to move inland by then. Highs again will remain steady and right around normal through the week.

HPR

AVIATION
An upper level low off the BC coast will keep flow aloft generally west to southwesterly. Surface winds generally south to southwesterly with speeds 5-10 kts. Exceptions are HQM and CLM, where the direction is more westerly and PAE, which is seeing occasional shifts to northerly. Most terminals will shift to northerly late Saturday morning or early Saturday afternoon.

Cigs remain VFR at the time of this writing, however in keeping with current pattern should see conditions lower to MVFR very late tonight/very early Saturday morning. Late morning should see cigs lift with VFR returning and only high clouds remaining by mid afternoon.

KSEA...VFR conditions in place with cigs generally 4000-5000 ft.
Will see these gradually lower tonight with MVFR conditions expected by 12Z thanks to another westerly push. Cigs expected to lift by 20Z, returning to VFR conditions. Southwesterly winds overnight into Saturday morning with speeds 4-8 kts. Winds shift northerly in the afternoon and pick up a little more speed, ranging 5-10 kts.

18

MARINE
Surface high pressure will move to the east this weekend and over the coastal waters. Diurnal westerly pushes will occur every evening in the Strait of Juan de Fuca (some likely needing the issuance of headlines). This evening's push looks to remain below 21 kt and have decided to hold off on issuing a Small Craft Advisory.
However, may occasionally see gusts in the 21-25 kt range.
Tomorrow's push down the Strait will be stronger and will likely need additional headlines as sustained winds will be around 21-25 kt. A weakening front will move over the coastal waters on Monday, followed by additional systems next week. Seas will remain below 10 ft into the weekend and next week.

29/18

SEW WATCHES/WARNINGS/ADVISORIES
WA...None.
PZ...None.