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

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PZZ210 Columbia River Bar- 247 Am Pdt Fri Apr 19 2024
In the main channel -
General seas - 2 to 4 ft through Saturday morning.
First ebb - Ebb current of 3.31 kt at 239 am Friday. Seas 4 ft.
SEcond ebb - Ebb current of 3.75 kt at 249 pm Friday. Seas 4 ft.
Third ebb - Ebb current of 3.96 kt at 322 am Saturday. Seas 4 ft.

PZZ200 247 Am Pdt Fri Apr 19 2024
Synopsis for the southern washington and northern oregon coast - High pressure east of the cascades with a thermal trough along the oregon coast continues through Friday afternoon. The thermal trough breaks down as a front approaches the waters tonight and moves through the waters Saturday.

FXUS66 KSEW 191619 AFDSEW

Area Forecast Discussion National Weather Service Seattle WA 919 AM PDT Fri Apr 19 2024

SYNOPSIS
Upper level ridge offshore today moving east through Western Washington late tonight and Saturday morning. Next front arriving Saturday evening. Upper level trough behind the front late Saturday night into Sunday morning moving into Eastern Washington Sunday afternoon. Upper level ridge building offshore Sunday night moving through Western Washington Monday. Weak upper level trough over the area later Tuesday and Wednesday with another front possible for Thursday.

SHORT TERM /TODAY THROUGH SUNDAY/
Satellite imagery shows clear skies over Western Washington this morning. Cross cascade gradient has turned negative with easterly winds picking up in the Cascade foothills and along the coast. Wide variety of temperatures at 3 am/10z. Locations not exposed to the east winds in the mid to upper 30s while locations with some easterlies in the upper 40s.

Upper level ridge offshore moving into Western Washington today.
This combined with the increasing offshore flow will give the area a warm day. High temperatures around 10 degrees above normal, in the 60s to mid 70s. Expect the coast and Cascade foothills to be the warmest locations.

Upper level ridge axis over Western Washington tonight with a low level offshore flow continuing into Saturday morning. Like this morning, locations exposed to the east winds will only drop into the 40s while more sheltered locations like Olympia get as cold as the mid 30s.

Ridge axis moving east of the area by late Saturday morning. Front offshore approaching but with the jet digging into the southern portion of the front the front will become negatively tilted slowing down its eastward progress. Rain west of the Puget Sound by afternoon with a chance of rain over most of the interior. The Northwest Interior still looks dry through the afternoon hours.
High temperatures are going to be a tough call. Low level offshore flow continuing but the increasing middle level clouds will reduce the amount of daytime heating over the interior.
Significantly cooler along the coast with highs near 60. Slightly cooler over the interior with highs in the 60s. A few places in the Cascade foothills could still get to 70 degrees.

Rain changing to showers after midnight Saturday night as the front moves through Western Washington. Unlike last night where the models were showing a cold pool of air behind the front along the coast, the models this morning have this cold pool well to the north near Haida Gwaii. Will not have any post frontal thunderstorms mentioned for the coast this morning. Snow levels near 5000 feet ahead of the front with a few inches of snow in the higher elevations especially in the North Cascades. Snow levels dropping to 3000-3500 feet behind the front early Sunday morning but the main batch of precipitation is with and ahead of the front leaving only a couple of inches of snow for the passes. Lows Saturday night in the upper 30s to mid 40s.

Upper level trough behind the front over Western Washington Sunday morning moving into Eastern Washington Sunday afternoon.
Shower activity over the lowlands decreasing in the afternoon.
Cool air aloft plus low level onshore flow making for a brisk day with highs only in the lower to mid 50s.

LONG TERM /MONDAY THROUGH THURSDAY/
Extended models in good agreement with an upper level ridge building offshore Sunday night moving into Western Washington Monday. Under sunny skies highs warming into the upper 50s to mid 60s. Ridge shifts east Monday night with an upper level trough approaching Western Washington Tuesday. With the trough staying offshore we should squeeze out one more dry day with highs again in the upper 50s to mid 60s.
Model consistency falls apart Tuesday night through Thursday.
There is general agreement that an upper level trough will be over Western Washington Tuesday night into Wednesday night with the ECMWF weaker with this feature versus the GFS. ECMWF has an organized front moving into the area Thursday while the GFS has this system moving inland south of the area. Ensembles don't show any clear trend so given the uncertainty will have chance pops in the forecast Tuesday night through Thursday. Highs Wednesday cooling into the mid 50s to lower 60s. Thursday even cooler with mid to upper 50s. Felton

AVIATION
Flow aloft will remain out of the northwest through the TAF period as an upper level ridge continues to build offshore. A thermal trough also remains positioned off the coast for offshore flow continuing. Weather remains dry as well with VFR conditions/clear skies expected. Breezy east to northeast winds across the region, with occasional gusts to 15 to 20 kt. Winds will likely decrease a bit this evening but struggle to get very light. A frontal system will arrive later on Saturday for breezy winds and the next chance for precipitation.

KSEA...VFR/clear skies through the TAF period. Winds easterly 8 to 12 kt, easing to around 4 to 8 kt in the evening. Winds turn southwesterly and breezy ahead of the next system coming in.

Kristell/LH

MARINE
An upper level ridge will begin to move inland today. A thermal trough remains positioned off the coast of Washington for continued offshore flow. The next approaching system for this weekend will promote some breezy winds with some gusts reaching 20 to 25 kt in the Central Strait of Juan de Fuca into this afternoon and evening, for which there is a Small Craft Advisory.
Additional gusty winds are possible Saturday and Sunday with the next system, including potential westerly gales in the Strait.

Seas remain around 3 to 6 ft through Saturday, before rising to 10 to 12 feet on Sunday. Seas may be steep over the weekend with short period waves being the dominant group.

Kristell/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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