textproduct: Seattle/Tacoma

SYNOPSIS

High pressure aloft across Western Washington today and remain into Friday with sunnier and warmer conditions. The ridge will weaken over the holiday weekend for a cooling trend lasting into early next week. Next system arriving early next week as well.

SHORT TERM /TODAY THROUGH SATURDAY/

Broad upper-level troughing resides over western CONUS while an upper-ridge is nosing into BC and W WA. Mostly clear skies across the CWA this morning aside from marine stratus along sections of the coast and southwest interior. This activity along with patchy river valley fog will continue before burning off as the morning progress. Mostly sunny skies today as large- scale subsidence ensues. High temperatures are forecast to be above average - in the 70s across the interior with near 80 F throughout the Chehalis River valley. Coastal areas to remain in the 60s. Overnight lows will fall into the 40s and lower 50s.

Upper-ridging will flatten on Friday as zonal flow switches into gear on Saturday. Temperatures will warm into into the 70s again for both Friday and Saturday but low-level onshore flow will also begin to strengthen. Coastal areas will see afternoon highs in the 60s with lows in the 40s and lower 50s area-wide.

LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/

Deterministic guidance continue to hold off rain over the interior until late Monday. However, ensembles are more progressive with an earlier arrival of the front late Sunday. This is in the current forecast with a chance of rain Sunday night and rain spreading over the area on Memorial Day. Upper- troughing on Monday/Tuesday before another ridge noses into the region towards midweek.

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AVIATION

High pressure will bring dry and stable conditions to western WA today. The flow aloft is northerly. Low level stratus clouds will form along the coast this morning for MVFR conditions. The interior will remain mostly clear and VFR. 33

KSEA...VFR today with N wind to 10 kt. 33

MARINE

Onshore flow will prevail this week with high pressure offshore and lower pressure inland. Expect diurnal westerly pushes through the Strait of Juan de Fuca with highest wind and waves during the late afternoon and evening hours. 33

HYDROLOGY

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

SEW WATCHES/WARNINGS/ADVISORIES

WA...None. PZ...Small Craft Advisory from 5 PM this afternoon to 5 AM PDT Friday for Central U.S. Waters Strait Of Juan De Fuca- East Entrance U.S. Waters Strait Of Juan De Fuca.

Small Craft Advisory from 2 PM this afternoon to 11 AM PDT Friday for Coastal Waters From Cape Flattery To James Island 10 To 60 Nm-Coastal Waters From James Island To Point Grenville 10 To 60 Nm-Coastal Waters From Point Grenville To Cape Shoalwater 10 To 60 Nm.