Sunrise 6:14 AM   Sunset 8:06 PM Moonrise 3:00 PM   Moonset 3:58 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 KPQR 192242 AFDPQR

Area Forecast Discussion National Weather Service Portland OR 342 PM PDT Fri Apr 19 2024

Updated aviation and marine discussion.



SYNOPSIS
High pressure holding steady over the region through tonight, with east to northeast winds on the west slopes of the Cascades and to some degree, the Coast Range. Cooler for Saturday, as a front moves across the region. This could result in spotty light rain into Saturday night. Dry and mild conditions return by the start of the upcoming week, with cooler showery weather returning by the middle of next week.

SHORT TERM
TONIGHT THROUGH SUNDAY NIGHT...A pattern change is on deck as a weak frontal system is expected to cross over the region starting late tonight/early Saturday morning. This will bring cooler daytime highs Saturday and Sunday. Offshore flow will slowly weaken and become onshore through the overnight hours, which will enable cooler marine air to infiltrate across the region. Models have slowed the front, and current guidance have light rain starting along the coast Saturday morning and arriving inland by the afternoon. At this time current guidance has this being a typical spring high PoP/low QPF event with the coast having around 0.10 to 0.20 inches, inland areas having 0.05 to 0.10 inches and the Cascades having 0.15 to 0.25 inches.
Also, with the onshore flow a.k.a. the air conditioning and clouds, expect daytime highs in the mid 50s to mid 60s on Saturday and low 50s to low 60s on Sunday. The pattern changes again Sunday/Monday as high pressure offshore will start building inland. This will end the shower potential, with morning marine clouds giving way to mixture of sunshine and clouds for the start of the upcoming week. -42


LONG TERM
MONDAY THROUGH THURSDAY...The early part of next week will be characterized by a short wave ridge across the West Coast. Dry and mild conditions are expected under mostly sunny to partly cloudy skies. Temperatures across the interior valleys will reach into the upper 60s to near 70 with a bump into the low 70s on Tuesday. A series of disturbances will approach the PNW toward the middle/end of next week. The first disturbance looks like it will be on the weaker side but could bring increasing clouds, cooler temps, and very light rain. The second disturbance will follow quickly on the heels of the first later in the week and could bring a better shot of rain to the area.
Model guidance varies at this point regarding timing and strength so changes should be monitored in the coming days.
-Batz



AVIATION
VFR this evening. Weak gap flow through east-west aligned terrain is causing gusty winds around KPDX, KHIO, and KTTD. Winds are gusting as high as 25 kt. High pressure begins to erode this evening and will see a high level VFR stratus shield develop after 10Z Saturday. Will see a wind directional shift along the coast as a weak front pushes in from the Pacific.
Precipitation is expected, though not looking at any impacts to VIS. Ceilings will begin to lower after 18Z Saturday starting along the coast, especially at KONP. There is around a 75% chance that IFR conditions will be present from KTMK southward along the coast. Inland locations will stay VFR. While the probability is very low (less than 10%), areas along the Columbia River west of KKLS may see some patchy fog right around sunrise. However, with the high stratus shield in place, it will likely insulate enough for fog formation to be inhibited.

Notes: Wind at KHIO will be unavailable overnight between 04Z and 13Z. The ASOS at KTTD is only available via the dial in option.
The AWOS at KMMV is still out of commission. As it is not maintained locally by the National Weather Service, there is no estimated time of repair.

PDX AND APPROACHES...VFR through the next 24 hours. Gusty east winds due to high pressure will persist through the early evening.
Periods of light rain through Saturday. No other concerns at this time. -Muessle

MARINE
High pressure dissipates tonight and a weak front moves inland Saturday. Main impact will be increasing winds which has initiated a Small Craft Advisory through Sunday morning. Winds become northerly and will persist through mid-week. -Muessle

PQR WATCHES/WARNINGS/ADVISORIES
OR...None.
WA...None.
PZ...Small Craft Advisory from 11 AM Saturday to 2 AM PDT Sunday for PZZ251>253-271>273.

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Knappa
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Fri -- 12:06 AM PDT     7.06 feet High Tide
Fri -- 04:58 AM PDT     Moonset
Fri -- 06:19 AM PDT     Sunrise
Fri -- 06:34 AM PDT     1.98 feet Low Tide
Fri -- 11:54 AM PDT     6.69 feet High Tide
Fri -- 04:00 PM PDT     Moonrise
Fri -- 06:55 PM PDT     0.81 feet Low Tide
Fri -- 08:08 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION

Knappa, Knappa Slough, Columbia River, Oregon, Tide feet

Harrington Point
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Fri -- 04:59 AM PDT     Moonset
Fri -- 06:19 AM PDT     Sunrise
Fri -- 06:28 AM PDT     2.10 feet Low Tide
Fri -- 11:46 AM PDT     6.10 feet High Tide
Fri -- 04:00 PM PDT     Moonrise
Fri -- 06:49 PM PDT     0.74 feet Low Tide
Fri -- 08:08 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION

Harrington Point, Columbia River, Washington, Tide feet

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