Sunrise 6:13 AM   Sunset 8:07 PM Moonrise 2:57 PM   Moonset 3:55 AM

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PZZ210 Columbia River Bar- 329 Pm Pdt Fri Apr 19 2024
In the main channel -
General seas - 3 ft building to 5 to 6 ft Saturday afternoon.
First ebb - Ebb current of 3.75 kt at 249 pm Friday. Seas 3 ft.
SEcond ebb - Ebb current of 3.96 kt at 322 am Saturday. Seas 3 ft.
Third ebb - Ebb current of 3.86 kt at 333 pm Saturday. Seas 5 to 6 ft.

PZZ200 329 Pm Pdt Fri Apr 19 2024
Synopsis for the southern washington and northern oregon coast - High pressure weakens tonight and a front moves inland from the eastern pacific Saturday. High pressure rebuilds next week.

FXUS66 KSEW 192226 AFDSEW

Area Forecast Discussion National Weather Service Seattle WA 326 PM PDT Fri Apr 19 2024

SYNOPSIS
Ridging will maintain dry and warm conditions into Saturday ahead of an approaching front that will bring in light lowland rain, mountain snow, and breezy winds. Unsettled conditions will continue through the remainder of the weekend.
Next week will start out drier and warmer ahead of more rainy weather mid- week.

SHORT TERM /TONIGHT THROUGH MONDAY/
Dry conditions will prevail today as a shortwave ridge continues to shift inland. Temperatures across the lowlands are on track to peak near or slightly below the 70 degree mark as offshore continues. Areas sheltered from the easterly winds will once again see much cooler overnight lows in the 30s, whereas more open areas will bottom out in the low to mid 40s. Temperatures will continue a warming trend into Saturday as surface winds shift southerly in the warm sector ahead of an incoming front, with ensembles showing a moderate (50% to 60%)
chance of surpassing 70 degrees across much of the lowlands.

A front will cross western Washington mid-day Saturday, bringing in a band of precipitation and breezy southwest winds as the front moves through. Post-frontal conditions will destabilize with troughing maintaining shower activity through Sunday afternoon.
Snow levels will lower to around 2500-3000 ft by Sunday morning with generally light rainfall amounts for the lowlands and 1 to 2 inches of snow accumulation through the Cascade passes over the span of the weekend. The bulk of the moisture with this system will be focused over the Northern Cascades, where the higher peaks will see up to 6 to 8 inches of snow through Sunday. Some mesoscale models also hint at convergence activity from Skagit County northward, which would locally enhance snowfall amounts over higher terrain, but confidence is low. Lingering shower activity will be cut off later on Sunday as a positively tilted trough swings a front across the Pacific Northwest. Cool air aloft paired with onshore flow will make for a brisk day on Sunday, with temperatures in the lowlands peaking in the mid 50s.

Decreasing cloud cover overnight Sunday into Monday morning paired with light winds will allow temperatures to drop quickly.
Conditions will be conducive for areas of frost to develop outside of the Puget Sound metro areas. High pressure will build inland on Monday, allowing conditions to dry out and temperatures to rebound back into the 60s.

LONG TERM /TUESDAY THROUGH FRIDAY/
Temperatures will warm into Tuesday as high pressure continues to amplify into western Washington. Models continue to show large model differences mid- week and beyond, but ensembles maintain a return to near normal conditions with a chance of light precipitation through the remainder of the period.

Lindeman

AVIATION
Flow aloft will remain west-northwesterly as an upper level ridge moves across the region. Conditions will remain VFR with clear skies through most of the TAF period. Ceilings will return after 18-21Z with as a frontal system approaches the region from the southwest. Showers are also not expected until towards the end of the TAF period, reaching Seattle and areas south by 00Z, but should be light in coverage.

Breezy easterly winds with occasional gusts up to 15 to 20 kt continue into this evening, easing up a bit to around 5 to 10 kt after 03-06Z tonight. Winds will switch to south-southwesterly tomorrow reaching 12 to 18 kt with gusts up to 25 to 30 kt possible.

KSEA...VFR/clear skies through the TAF period. Increasing clouds after 18-21Z but remaining VFR Winds easterly 8 to 12 kt, easing to around 4 to 8 kt in the evening. Winds turn southwesterly 12 to 18 kt, with gusts up to 25 kt ahead of the next system coming in.

LH

MARINE
Broad high pressure situated across the Pacific Northwest, with a weak thermal trough situated along the coastline. The next frontal system is situated well offshore, sitting around 135 W as of this afternoon. Winds are offshore/easterly across the coastal waters today, with the breeziest winds through the Central Strait of Juan de Fuca, reaching 15 to 20 kt. Winds should remain just below Small Craft Advisory level going into tonight, so the advisory has been dropped. Offshore flow will be enhanced through the gaps around the Olympics tomorrow as the system approaches, thus a Small Craft Advisory will begin early tomorrow morning for the coastal waters north of Point Grenville, as well as the Central and West Entrance to the Strait of Juan de Fuca. Winds will pickup in the coastal waters north of Cape Shoalwater, as well as into the Eastern Strait of Juan de Fuca and through Puget Sound Saturday afternoon as the front moves through the coastal waters. Winds look to ease area-wide late Saturday night into Sunday.

High pressure will return Sunday afternoon into the beginning of next week, with a few pushes of westerly winds down the Strait of Juan de Fuca which will likely require additional headlines.

Seas remain around 3 to 5 ft through tonight. Seas will rise to 8 to 12 ft Saturday afternoon into Sunday. Seas may be steep, particularly through the outermost waters, over the weekend with the dominant period being 9 seconds. Seas decreasing to 6 to 8 ft Sunday and Monday then decreasing further into midweek.

LH

HYDROLOGY
No river flooding expected over the next 7 days.

SEW WATCHES/WARNINGS/ADVISORIES
WA...None.
PZ...Small Craft Advisory until 8 PM PDT this evening for Central U.S. Waters Strait Of Juan De Fuca.

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