Marine Weather and Tide Forecast for Snoqualmie, WA

SYNOPSIS
A broad upper level trough will gradually advance eastward, with drier conditions for areas other than the mountains by Tuesday afternoon. Another disturbance will bring additional shower chances Wednesday, and several additional systems arriving later in the week through next weekend.

SHORT TERM /TODAY THROUGH THURSDAY/
As of early this morning, mostly dry conditions with only a few isolated showers mostly confined near the Cascades. As the main upper low shifts eastward today, expect that any showers will be limited to a few scattered over the higher terrain.
Otherwise, areas of low stratus again developing along the coast and into portions of the interior, which will likely remain into the mid-morning hours before gradual improvement occurs this afternoon.

Overall, not much change in the pattern into Wednesday, though coverage may increase a bit as an embedded shortwave clips the northern portion of the area. High temperatures will remain in the lower to mid 60s for the interior, with mid to upper 50s for the coast and water adjacent locations. A deeper disturbance arrives again around Thursday, ushering in a more widespread chance of rain showers across the region.

LONG TERM /THURSDAY NIGHT THROUGH MONDAY/
Generally decent agreement in the ensemble guidance for the end of the week with another broad upper trough bringing additional rain to the region this weekend. While QPF remains on the lower side, a generally cool and showery pattern will be the most likely result for the region into the start of next week.
Temperatures hold fairly consistent through the long term, generally holding in the lower to mid 60s.

AVIATION
North to northwesterly flow aloft over W WA today before turning more northwesterly early Wednesday. Winds at the surface are southwest in most areas at 4 to 8 kt. A push through the Strait of Juan de Fuca this afternoon may turn the winds northwesterly later in the afternoon/evening with some diffluence (but should stay north of Seattle). Will weaken tonight and become more southwesterly into Wednesday (with strongest winds in the South Interior, and coastal areas along the Pacific and the strait).

Satellite has pockets of MVFR dropping southward along the I-5 corridor this morning with an associated area of showers, as well as the coast (most terminals reporting ceilings as low as 1,000 to 2,000 feet). Couple isolated pockets of IFR/LIFR continue in the Cascades and offshore the coastline. Once the showers pass through, conditions will improve to VFR with clouds remaining through the afternoon (best chance of some clearing will be from KPAE northward for a few hours this evening. MVFR will remain along the coast through today, and a cold front tonight will bring a few isolated showers (primarily north of I-90), and widespread MVFR ceilings Wednesday morning.

KSEA...Small corridor of showers tracking through the terminal this morning. This has brought CIGs down to MVFR this morning. Once the showers move through, CIGs are expected to lift up to VFR (remaining BKN/OVC) between 18-21Z. Winds are expected to remain out of the southwest 4 to 8 kt at the terminal (but possible that winds to the north may flip northwesterly later this afternoon and evening). CIGs expected to dip back to MVFR later tonight into Wednesday morning.

18/HPR

MARINE
High pressure over the coastal waters with lower pressure inland will remain intact through Wednesday night, allowing for westerly pushes down the Strait both this afternoon and Wednesday afternoon. Forecast has SCA winds for both time frames and as such, will issue a new SCA to cover this afternoon through overnight. A follow up headline for Wednesday may be needed, but will leave for future shifts to determine. Frontal system moving through the waters later Thursday into Thursday night. High pressure will build over the coastal waters for the weekend.

Northwest winds 15 to 25 mph with seas 10 to 12 feet over the outer Coastal Waters today...and enough of a spill-over when it comes to seas may impact portions of the inner coastal waters. As such, felt expansion of the inherited SCA there was warranted. Both the winds and seas will subside tonight with no headline criteria expected afterward for the remainder of the week. 18

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

SEW WATCHES/WARNINGS/ADVISORIES
WA...None.
PZ...Small Craft Advisory from 5 PM this afternoon to 5 AM PDT Wednesday for Central U.S. Waters Strait Of Juan De Fuca- East Entrance U.S. Waters Strait Of Juan De Fuca.
Small Craft Advisory until 5 AM PDT Wednesday 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.