Marine Weather and Tide Forecast for Seattle, WA

SHORT TERM /TODAY THROUGH THURSDAY/
The latest forecast remains on track this morning with no updates outside of the Aviation section below. Showers will continue to linger over the Cascades today with drying elsewhere. Highs today are expected to be in the upper 50s and low 60s.

A ridge returns over the northeastern Pacific Wednesday into Thursday for dry and warm weather. Highs on Wednesday will climb into the mid to upper 60s and steadily higher yet on Thursday, with highs in the mid to upper 70s. 80 degree temperatures are likely in Cascade valleys and into the Southwest Interior.
For this time of year, temperatures reaching near 80 degrees does put much of Puget Sound in the minor (yellow) HeatRisk category.

LONG TERM /FRIDAY THROUGH MONDAY/
Another warm day (although slightly less than Thursday) is expected on Friday. Pleasant temperatures in the low 70s are expected, with upper 50s along the coast. While the forecast has some light precipitation in for Friday afternoon, at this point, it seems more showery and not widespread. The timing of the next system has been pushed back, with the track of the low and associated frontal system not nearing the region until closer to early Saturday morning. The core of the low pressure system seems to track into northern California, for light rain to return in a more widespread fashion on Saturday. QPF amounts will be light again, with about a quarter of an inch favored in the Cascades.

Precipitation looks to taper off on Sunday, with split flow aloft bringing mild conditions back through Monday.

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AVIATION
An upper level trough will move through WA this afternoon. A warm front currently sits on the WA/Canadian border this morning, with a cold front trailing just west of the Olympics.
Majority of terminals sit within the warm sector this morning (with drizzle/light rain in some spots), and the increased moisture continues to produce widespread pockets of IFR (with sporadic/isolated spots of LIFR with visibilities as low as 1 mile and ceilings down to as low as 300 ft). The lowest CIGs were being observed from KHQM to KOLM, up through at least KPAE and over to KFHR. Outside of this, remaining terminals report MVFR, but many of them report SCT005. Timeframe for ceiling improvements to improve to MVFR/VFR is 18-21Z (CIGs will scatter out in most spots). Once the cold passes through, onshore flow will increase and may lead to gusty winds at times along the coast and Strait of Juan de Fuca (will shift more from the southwest to the west/northwest across the region today at 5 to 10 kt (gusts to 18 kt possible along the coast). The push Wednesday morning will likely bring CIGs back down to MVFR Wednesday morning, before clearing out.

KSEA...Ceilings have dropped to LIFR this morning with visibilities as low as a mile. Giving the slow trends towards improving to MVFR, did roll back the TAF to show improvement later this morning/early afternoon (should become VFR late this afternoon). Winds remain southwesterly this morning at 6 to 10 kt. Shift to the north/northwest is expected as early as 20Z.

HPR

MARINE
A weak frontal system will move inland this morning with onshore flow briefly increasing behind it as surface ridging rebuilds across the coastal and offshore waters. The ridge will remain in place over the coastal waters into Thursday producing light onshore flow. A weak front will reach the waters at the end of the week with possible wind-related headlines mainly for the coastal waters.

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HYDROLOGY
No river flooding is expected over the next 7 days.

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