Thursday, July29, 2021
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Marine Weather and Tides
Skamokawa Valley, WA

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 5:49AMSunset 8:47PM Thursday July 29, 2021 7:32 AM PDT (14:32 UTC) Moonrise 10:50PMMoonset 11:05AM Illumination 73% Phase: Waning Gibbous; Moon at 20 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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PZZ210 Columbia River Bar- 320 Am Pdt Thu Jul 29 2021
In the main channel.. - general seas...1 to 3 ft through Thursday night. - first ebb....Around 915 am Thu. Seas around 3 ft. - second ebb...around 10 pm Thu. Seas around 3 ft. - third ebb...around 10 am Fri. Seas around 3 ft.
PZZ200 320 Am Pdt Thu Jul 29 2021
Synopsis for the southern washington and northern oregon coast.. Typical mid-summer northerly wind pattern will persist into next week. High pressure remains anchored well offshore, while thermal low pressure sits over nw california into extreme sw oregon. This will maintain northerly flow across the waters, generally strongest each afternoon and evening.


7 Day Forecast for Marine Location Near Skamokawa Valley, WA
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location: 46.27, -123.45     debug


Area Discussion for - Portland, OR
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FXUS66 KPQR 291049 AFDPQR

Area Forecast Discussion National Weather Service Portland OR 345 AM PDT Thu Jul 29 2021

SYNOPSIS. Hot weather for the interior lowlands next two days with temperatures in the mid and upper 90s, with some locations in reaching 100 degrees especially on Friday. It will turn cooler for the weekend into next week but temperatures remain above normal. Increasing monsoonal moisture will bring periods of showers and potential thunderstorms primarily across the central Cascades and extending into the northern Cascades through the weekend and likely into the start of next week.

SHORT TERM. Today through Saturday . The big picture - Strong upper level high pressure central US with upper level trough over the northeast Pacific. The resulting weather for the PacNW is advection of a warm and somewhat moist airmass into the area from the south to southwest flow aloft. Today and Friday will be hottest days with some cooling for Saturday. High temperatures for the interior lowlands expected in the mid and upper 90s, but likely see temperatures around 100 on Friday, the mid 90s for Saturday. Overnight lows are expected to be on the warm side low to mid 60 tonight and Friday night. But note that the heat soaked urban areas as well as the Gorge will likely have lows around 70 Friday night. The Heat Advisory continues through Saturday. Models have changed little over the last 12 hours so feel confident in the forecast. But one thing that might affect the temperature forecast is cloud cover from expected convection next couple of days. Friday night convection may bring enough cloud cover over the valley to keep it warmer than current forecast. Though if clouds arrive earlier than expected it'll moderate high temps.

The chance of thunder increases and expands today with NAM forecast soundings suggesting 1000-1200 J/kg of CAPE along the Linn, Lane, and upto Marion Co. Cascades, where surface heating will be maximized. SPC 4-hour calibrated thunderstorm probability shows 30-40% chance right along the crest today. Satellite shows a batch of moisture moving north across central CA that'll shift into our area this afternoon, so the ingredients are coming together. Friday is currently looking to be both the hottest and most favorable day for thunderstorms for all of the Oregon Cascades. The foothills and Washington Cascades might also have a shot at seeing convection as well. Various CAM forecast reflectivity shows larger area of showers moving north along the Cascades Friday afternoon, but have backed down the south WA Cascades. /mh

LONG TERM. Saturday night through Tuesday . The GFS and CMC suggest convection will develop Saturday evening and overspread portions of the eastern Willamette Valley during the overnight period, while the ECMWF keeps everything west of the Cascade crest dry. The westward extent of any convection that forms will depend on how much of an easterly component is present in the mid to upper- level steering flow. At this time, a slight chance of thunder has been added only for the Cascades, in accordance with NBM's most recent guidance. If necessary, changes may be made to chances for convection in upcoming forecasts.

Sunday and beyond, the pattern becomes more uncertain, with some cluster solutions favoring a transition to zonal flow and others suggesting a continuation of southerly flow into early next week. One solution, comprised mostly of the CMC, suggests the low to our northwest will drop into our area to lower heights and promote cooler weather. NBM currently suggests high temperatures in the low 80s to low 90s in the Willamette Valley and 60s along the coast through the end of the period. -Bumgardner

AVIATION. Clear skies and VFR conditions prevail across the forecast area as of 1030z. Fog is developing under a shallow marine layer just off the coast. Similar to Wed morning, IFR fog/low clouds may affect KAST/KONP for a few hours around sunrise this morning. Given how shallow the marine layer is, any morning clouds should clear for VFR conditions by 17z, with breezy N winds gusting up to 25 kt expected along the coast thereafter.

VFR conditions will persist through this evening inland, though isolated showers/thunderstorms may develop this afternoon over the Cascades east of KEUG. No significant impacts are anticipated for the Willamette Valley.

For detailed regional Pac NW aviation weather information, go online to: https://weather.gov/zse

KPDX AND APPROACHES . VFR expected through the period, with light to moderate NW sfc winds. Ground crews can expect a hot afternoon with highs well into the 90s today. Weagle

MARINE. Typical summer pattern expected for the next several days. Increased heating inland on Thursday should strengthen the thermally induced low pressure over SW Oregon and NW California. There is a chance cloud cover increases Thu afternoon which could weaken the thermal trough, but most models show widespread gusts to 25 kt across the waters. Thus we maintained a Small Craft Advisory on Thu from noon through midnight for all waters, extending overnight for the outer waters. Similar diurnal northerly wind pattern is expected Friday into the weekend. Seas will remain primarily wind-driven with background swells generally remaining 3 ft or less through the weekend. Weagle/DDH

PQR WATCHES/WARNINGS/ADVISORIES. OR . Fire Weather Watch from Friday morning through Friday evening for Central Oregon Cascade Foothills-Mt. Hood National Forest West of Cascade Crest-North Oregon Cascade Foothills-Willamette National Forest.

Heat Advisory from 11 AM this morning to 11 PM PDT Saturday for Cascade Foothills in Lane County-Central Columbia River Gorge-Central Willamette Valley-Greater Portland Metro Area-Lower Columbia-Northern Oregon Cascade Foothills- South Willamette Valley-Upper Hood River Valley-Western Columbia River Gorge.

Red Flag Warning from 2 PM this afternoon to 11 PM PDT this evening for Willamette National Forest.

WA . Heat Advisory from 11 AM this morning to 11 PM PDT Saturday for Central Columbia River Gorge-Greater Vancouver Area-I-5 Corridor in Cowlitz County-South Washington Cascade Foothills-Western Columbia River Gorge.

PZ . Small Craft Advisory from noon today to 6 AM PDT Friday for coastal waters from Cape Shoalwater WA to Florence OR from 10 to 60 NM.

Small Craft Advisory from noon today to midnight PDT tonight for coastal waters from Cape Shoalwater WA to Florence OR out 10 NM.



Interact with us via social media: www.facebook.com/NWSPortland www.twitter.com/NWSPortland


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ASTO3 - 9439040 - Astoria, OR 17 mi44 min Calm G 1.9 61°F 71°F1018.8 hPa
LOPW1 - 9440422 - Longview, WA 29 mi44 min 72°F1018.7 hPa
46243 - Clatsop Spit, OR - 162 36 mi36 min 56°F2 ft
TOKW1 - 9440910 - Toke Point, WA 41 mi44 min NW 2.9 G 4.1 57°F 57°F1019.4 hPa

Wind History for Astoria, OR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Astoria, Astoria Regional Airport, OR24 mi37 minN 010.00 miOvercast58°F56°F93%1019.1 hPa

Link to 5 minute data for KAST

Wind History from AST (wind in knots)
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1 day agoW6NW9NW8NW8NW10NW10NW10W12NW12W12NW12NW12NW11NW11NW7NW7SE4CalmSE4CalmCalm3SE4SE3
2 days agoNW11NW10NW8N5NW6NW9NW13NW14NW14NW17NW15NW12NW12NW9NW9NW9NW9NW11NW8NW6NW7NW8W4NW5

Tide / Current Tables for Knappa, Knappa Slough, Columbia River, Oregon
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Knappa
Click for Map
Thu -- 12:56 AM PDT     1.43 feet Low Tide
Thu -- 05:53 AM PDT     Sunrise
Thu -- 06:10 AM PDT     6.70 feet High Tide
Thu -- 12:06 PM PDT     Moonset
Thu -- 01:03 PM PDT     0.35 feet Low Tide
Thu -- 07:01 PM PDT     7.33 feet High Tide
Thu -- 08:47 PM PDT     Sunset
Thu -- 11:50 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.71.423.34.96.16.76.55.64.32.91.60.70.40.82.13.95.66.87.3764.83.5

Tide / Current Tables for Harrington Point, Columbia River, Washington
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Harrington Point
Click for Map
Thu -- 12:49 AM PDT     1.47 feet Low Tide
Thu -- 05:53 AM PDT     Sunrise
Thu -- 06:02 AM PDT     6.11 feet High Tide
Thu -- 12:06 PM PDT     Moonset
Thu -- 12:57 PM PDT     0.21 feet Low Tide
Thu -- 06:53 PM PDT     6.75 feet High Tide
Thu -- 08:48 PM PDT     Sunset
Thu -- 11:50 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.71.52.13.34.75.76.15.84.93.72.41.30.50.20.723.75.36.46.76.45.54.33.1

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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