Friday, June23, 2017

Marine Weather and Tides
Scappoose, OR

Version 3.4
What's New / NOTES
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 5:21AMSunset 9:06PM Friday June 23, 2017 3:17 AM PDT (10:17 UTC) Moonrise 4:17AMMoonset 7:40PM Illumination 1% Phase: New Moon; Moon at 29 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- 211 Am Pdt Fri Jun 23 2017
.small craft advisory for rough columbia river bar in effect until 7 am pdt this morning...
.small craft advisory for rough columbia river bar in effect this afternoon...
.small craft advisory for rough columbia river bar in effect from late tonight through Saturday morning...
In the main channel..Combined seas 5 ft. However, seas will temporarily build to near 8 feet with breakers during the very strong ebb around 445 am Friday and to near 7 ft with breakers likely during the ebb around 515 pm Friday. Seas will also build to 8 feet with breakers during the very strong ebb around 530 am Saturday morning.
PZZ200 211 Am Pdt Fri Jun 23 2017
Synopsis for southern washington and northern oregon coast.. High pressure over the northeast pacific and thermal low pressure over the northern california and southern oregon coast will continue through Saturday afternoon. A weak low develops over the waters Saturday night and remains through Monday. High pressure rebuilds over the waters Monday night and Tuesday.

7 Day Forecast for Marine Location Near Scappoose, OR
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location: 45.7, -122.87     debug

Area Discussion for - Portland, OR
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Fxus66 kpqr 230917
area forecast discussion
national weather service portland or
216 am pdt Fri jun 23 2017

Synopsis High pressure aloft over the forecast area will
strengthen through the weekend. A thermally-induced surface trough
and resultant offshore low-level flow will result in hot temperatures
Friday through Sunday. A southwest marine surge occurs along the
central coast Saturday night and Sunday. A deeper marine push occurs
Monday for cooler temperatures inland. Strong onshore flow continues
Tuesday through mid-week, potentially followed by a gradual warming
trend late in the week.

Short term Friday through Sunday... The big picture remains
virtually unchanged. Still looking at a couple hot days followed by a
significant cooling trend. However, there are several subtle details
to think about, which makes the short term forecast not as
straight-forward as one might think. Water vapor imagery early this
morning shows a strong 500 mb high pres cell centered near 41n 132w.

Very dry air aloft, as evidenced by the dark water vapor colors,
covers much of oregon. The 00z ksle sounding shows the classic
subsidence inversion with an rh around 3 percent near 800 mb.

Today starts the main warming trend. The 23 00z ksle sounding came in
with an 850 mb temp of 15.8c, about as forecast 24 hours ago. The 00z
nam, gfs, and ECMWF all show 850 temps warming to 18c today in the
far north to 22c in the far south, or another 4-5 deg c from thu. The
18z GEFS plumes for kpdx suggest upper 80s today. The low-level flow
remains more north this morning, then should shift to northeast by
the afternoon. The NAM shows offshore flow developing in the gorge
this morning, but it may not impact kttd until early afternoon.

Overall, nudged todays MAX temps down a couple degrees.

Will also make some adjustments to the heat advisory that is valid
for today. The most recent heat impact tools, which were run early
this morning, show the primary area of concern to be the north and
central willamette valley, clark county in SW washington and the west
gorge. Another issue to consider is the afternoon humidity. The
offshore flow will maintain fairly low dew points, with minimum
humidity in many areas below 20 percent. Today is a borderline case
for a heat advisory, but will maintain it for the aforementioned

Friday night the thermally-induced surface trough is expected to the
cover the coast, oregon coast range and SW washington willapa hills.

The offshore flow should peak late Friday night and Sat morning. The
nam indicates a kttd-kdls gradient around -3 to -4 mb 12z sat. Expect
pronounced subsidence inversions in the higher terrain as well. The
operational run of the GFS and ECMWF boost 850 mb temps to around
22-25c 00z sun. The 18z GEFS plumes for kdpx show many ensemble
members in the mid 90s sat. As has been the case the past few days,
believe the latest met and mav guidance are too warm for sat. In any
event, heat advisory conditions are highly likely across much of the
forecast area sat, including the coast.

Things get a little interesting sun. The 00z NAM continues its trend
of showing the southwest marine surge beginning early Sun evening
along the south coast. By 12z the NAM has the south wind reversal to
near konp. Meanwhile, an upper level trough is forecast to track
across central and south british columbia sun, which flattens the 500
mb ridge. Models show the thermal trough hanging tough over the
northern third of the forecast area Sun morning. The NAM wants to
shift it east of the cascades by Sun afternoon. This trend is a
well-known bias for the nam. Typically, the thermal trough does not
jump the cascades until early evening. However, some marine air
seepage is expected to leak into the central oregon coast range
valleys and get into the south end of the willamette valley sun
afternoon. The central columbia gorge and mt. Adams area will have
their warmest day sun. Another expected subtle change Sun will be
higher dew points. South to southwest mid-level flow will allow some
moisture to creep north from the sierras. In addition, there will be
less wind, except near the west end of the gorge, to make things feel
a little more sticky. Weishaar

Long term Sunday night through Friday... Models in good agreement
showing a significant cooling trend early next week. The GFS and
ecmwf generally agree showing a one-two punch Sun night through mon.

Both models show a short-wave approaching the N california coast 12z
mon, while another short-wave drags across SW british columbia. Have
left the slight chance mention of thunderstorms for the higher lane
county cascades late Sun night through mon. Model soundings are not
all that impressive and the mid-level flow becomes sw-w by late sun
night, but cannot rule out some elevated convection over the higher
lane county cascades at the leading edge of the deepening marine
layer. A few storms could initiate just before the marine air
arrives, but any that do develop will be quickly pushed east.

The bigger story will be the significant cooling Mon as MAX temps
fall to near normal values. Models maintain a deep marine layer tue
and wed, which lowers MAX temps to a few degrees below normal. The
onshore flow should bring plenty of marine stratus into the
region Tue morning, with clouds clearing back to the coast in the
afternoon. The same general pattern holds through the rest of the
week, but inland marine intrusion may be less widespread each
morning. The GFS and ECMWF show much more variance late next week,
with the ECMWF moving a 500 mb ridge axis to the near the coastline
12z fri. The GFS keeps it much more offshore, with cyclonic NW flow
aloft over the area, which would result in stronger onshore flow
compared to the ecmwf. Weishaar

Aviation WidespreadVFR conditions under strengthening high
pressure and dry north winds. North winds will become gusty in
the afternoon along the coast and the interior valleys.

Kpdx and approaches...VFR conditions. North winds will increase
and gust to around 20 kt in the afternoon. Strengthening high
pressure and dry northerly flow will bringVFR conditions through
06z Saturday. ~tj

Marine There will be little change in the pressure pattern
today, and gusty north winds and steep seas will persist. Winds
will turn weakly offshore late tonight ending the small craft
winds. The winds beyond 20 nm will still be gusty, and close to
small craft advisory criteria through Saturday night. A
southerly wind reversal will move northward across the waters
Saturday night and Sunday. These have a tendency to end up
stronger and earlier than forecast so will need to monitor this.

A seasonal north wind pattern return early next week. ~tj

Pqr watches warnings advisories
Or... Excessive heat watch from Saturday afternoon through Sunday
evening for cascade foothills in lane county-cascades in
lane county-central coast range of western oregon-central
columbia river gorge-central willamette valley-coast range
of northwest oregon-greater portland metro area-lower
columbia-northern oregon cascade foothills-northern oregon
cascades-south willamette valley-upper hood river valley-
western columbia river gorge.

Heat advisory from noon today to noon pdt Saturday for central
willamette valley-greater portland metro area-northern
oregon cascade foothills-western columbia river gorge.

Heat advisory from noon to 9 pm pdt Saturday for central oregon
coast-north oregon coast.

Wa... Excessive heat watch from Saturday afternoon through Sunday
evening for central columbia river gorge-greater vancouver
area-i-5 corridor in cowlitz county-south washington
cascade foothills-south washington cascades-western
columbia river gorge-willapa hills.

Heat advisory from noon today to noon pdt Saturday for greater
vancouver area-south washington cascade foothills-western
columbia river gorge.

Heat advisory from noon to 9 pm pdt Saturday for south
washington coast.

Pz... Small craft advisory for winds until 5 am pdt Saturday for
coastal waters from CAPE shoalwater wa to florence or out
60 nm.

Small craft advisory for hazardous seas until 3 am pdt Saturday
for coastal waters from cascade head or to florence or out
60 nm.

Small craft advisory for rough columbia river bar until 7 am
pdt this morning.

Small craft advisory for rough columbia river bar from 3 pm
this afternoon to 6 pm pdt this evening.

Small craft advisory for rough columbia river bar from 3 am to
7 am pdt Saturday.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 28 mi47 min 61°F1022.2 hPa
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 56 mi47 min 53°F1021.5 hPa
ASTO3 - 9439040 - Astoria, OR 59 mi47 min E 1.9 G 4.1 57°F 64°F1022.2 hPa

Wind History for Longview, WA
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1 day
2 days

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Scappoose Industrial Airpark, OR5 mi24 minNNW 710.00 miFair64°F37°F38%1020.8 hPa
Portland-Hillsboro Airport, OR12 mi24 minWNW 510.00 miFair57°F46°F67%1020.4 hPa
Pearson Airfield, WA12 mi24 minWNW 410.00 miFair62°F39°F43%1020.7 hPa
Portland, Portland International Airport, OR16 mi24 minNW 610.00 miFair61°F39°F46%1020.7 hPa

Wind History from SPB (wind in knots)
Last 24hrN8NW10N8N12
1 day agoNW3CalmCalmCalmCalm4N9N10NE11N10
2 days ago--NW3S4CalmCalmCalmNE465N8N8NW10NW9

Tide / Current Tables for Rocky Point, Multnomah Channel, Oregon
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Rocky Point
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Fri -- 12:12 AM PDT     0.52 feet Low Tide
Fri -- 05:13 AM PDT     3.40 feet High Tide
Fri -- 05:17 AM PDT     Moonrise
Fri -- 05:22 AM PDT     Sunrise
Fri -- 02:10 PM PDT     -0.12 feet Low Tide
Fri -- 06:24 PM PDT     1.92 feet High Tide
Fri -- 07:32 PM PDT     New Moon
Fri -- 08:39 PM PDT     Moonset
Fri -- 09:04 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Tide / Current Tables for Kelley Point, Oregon - IGNORE HEIGHTS
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Kelley Point
Click for MapNote: The Columbia River is subject to annual freshets. Short range predictions are available at local river forecast centers. The data for stations above Harrington Point apply only during low river stages. There is a tidal influence along most of the

Fri -- 01:56 AM PDT     2.13 feet Low Tide
Fri -- 05:17 AM PDT     Moonrise
Fri -- 05:22 AM PDT     Sunrise
Fri -- 06:06 AM PDT     9.76 feet High Tide
Fri -- 03:05 PM PDT     -1.60 feet Low Tide
Fri -- 07:32 PM PDT     New Moon
Fri -- 07:37 PM PDT     7.57 feet High Tide
Fri -- 08:39 PM PDT     Moonset
Fri -- 09:04 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Weather Map and Satellite Images
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Weather Map
IR Satellite Image from GEOS

GOES Local Image of PacificNorthwest    EDIT

Wind Forecast for Portland, OR (6,6,7,8)
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Ground Weather Radar Station Portland, OR
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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.