Wednesday, March29, 2017 L-36.com


Marine Weather and Tides
Cohassett Beach, WA

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:55AMSunset 7:43PM Wednesday March 29, 2017 8:14 AM PDT (15:14 UTC) Moonrise 7:13AMMoonset 8:56PM Illumination 5% Phase: Waxing Crescent; Moon at 2 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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PZZ110 Grays Harbor Bar- 317 Am Pdt Wed Mar 29 2017
.small craft advisory for rough bar in effect through this afternoon... Combined seas 10 to 12 ft...subsiding to 8 to 10 ft this afternoon. Bar conditions rough...with breakers likely during the strong morning ebb...becoming moderate this afternoon. The maximum ebb currents will occur around 615 am and 630 pm today.
PZZ100 317 Am Pdt Wed Mar 29 2017
Synopsis for the northern and central washington coastal and inland waters..A cold front offshore will move across the coastal waters this morning and the interior waters this afternoon. Expect moderately strong onshore or westerly flow to develop behind the front. Onshore flow will persist on Thu before weakening Thu night.

7 Day Forecast for Marine Location Near Cohassett Beach, WA
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location: 46.88, -124.08     debug


Area Discussion for - Seattle, WA
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Fxus66 ksew 291035
afdsew
area forecast discussion
national weather service seattle wa
335 am pdt Wed mar 29 2017

Synopsis A frontal system will move through western washington
today, bringing more rain and locally windy weather. An upper
trough will follow tonight, with decreasing showers and some sun
breaks Thursday. An upper ridge will move across the area for dry
weather Friday. A weak system should bring some light rain to the
area over the weekend, with a chance of showers early next week.

Short term The next frontal system is just offshore early this
morning. Its 1009 mb surface low is centered about 120 nm off the
washington coast, with a warm front that extends southeast into
western oregon and a cold front that trails southwest. Aside from
parts of the north interior, precipitation is already widespread
across western washington ahead of the warm front. Southeast winds
are gusting to 35 to 35 mph on the north coast and in the north
interior. Temperatures were in the mid to upper 40s at 2 am.

The warm front will lift northeast across western washington
during the next few hours. The cold front will follow midday or
early afternoon, and the steady rain will turn to showers. The
surface low will track northeast across the southern part of
vancouver island today, bottoming out only around 1004 mb; however
models agree that strong southwest winds -- probably 40 to 50 kt
in the layer 2000 to 6000 ft aloft -- will produce a 1006 mb near
the northeast corner of the olympic peninsula. That should produce
breezy to windy conditions across much of the western washington
interior today, including the seattle area.

Cool moist onshore flow will follow the front tonight, with an
upper trough moving through the forecast area late tonight.

Showers will fall mainly in along the west slopes of the
mountains and the puget sound convergence zone, with scattered
showers elsewhere.

We can expect precipitation amounts of 1 to 2.5 inches during the
next 24 hours in the cascades and olympics, with up to an inch of
rain in the lowlands. The snow level is around 3000 to 4000 ft
early this morning; it will rise to 5000 to 6000 ft this morning
as the warm front moves through, then fall to around 3500 ft late
tonight. So most of the spots in the mountains that people can
reach by car could have snow early this morning, switching to rain
during the day and back to snow tonight. Mt baker probably has
the best shot for precipitation to fall as snow throughout the
event.

Northwest flow will take over on Thursday behind the upper trough.

Showers will decrease during the day and be pretty much confined
to the cascades and maybe the weakening convergence zone by
afternoon, and most of the western washington lowlands should have
a partly sunny afternoon or at least some Sun breaks. It will be
rather cool though with highs mainly 50 to 55 -- similar to today,
and the snow level will be near 3000 ft.

A positively tilted upper ridge will lean across the forecast area
Friday, and it should be a day of dry weather. However, models
seem to be trending toward slightly faster timing with the passage
of the ridge. And it looks rather with dirty, with some upper
cloud cover probably moving into the area ahead of an approaching
weak frontal system. In fact, models agree fairly well now that
that weak system will bring a chance of rain to the area by late
Friday night, and i've made that change to the forecast. Mcdonnal

Long term The frontal system discussed just above will weaken
as it moves across western washington Saturday, for a chance of
rain. An upper trough will follow it on Sunday for a chance of
showers. Then a small upper ridge will progress across the area
Monday for a partly sunny and probably some spotty light showers.

A weak upper trough will keep a chance of showers in the forecast
again Tuesday. Although a chance of precipitation will be
mentioned each day Saturday through Tuesday, this looks like a
period of rather benign weather and precipitation -- where it does
fall -- won't amount to much. Mcdonnal

Aviation An upper level trof offshore will approach the area
during the day today. Strong wly flow aloft will cont. A cdfnt will
move across the area this afternoon. Low level sly flow will become
wly behind the front. Fairly wdsprd MVFR cigs/vsbys will improve to
areas of MVFR CIGS this afternoon. The mtns will be obscd this
morning, and partially obscd this afternoon.

Ksea... CIGS will likely bounce betweenVFR and MVFR categories
thru this morning. Ely winds will become sly 10-15 kt by midday.

Marine
A cold front will move across the coastal waters this morning and
the interior waters this afternoon. Expect moderately strong onshore
or westerly flow to develop behind the front. Onshore flow will
persist on Thursday before weakening Thursday night.

Hydrology Up to 4.5 inches of rain fell over the wetter
portions of the olympic peninsula during the past 24 hours, which
drove the skokomish river above flood stage Wednesday evening. The
skokomish near potlatch appears to be near its crest early this
morning, though additional rain over the next few hours could
drive it a bit higher. It should fall slowly later today and
tonight, probably dropping below flood stage late tonight.

Other rivers will see rises, but no other river is forecast to
reach flood stage. Aside from the current flooding on the
skokomish, flooding is not expected on our rivers during the next
week.

The threat of landslides has increased somewhat due to rainfall
over the past 24 hours and expected through Wednesday. A special
weather statement is out to cover this elevated risk. Mcdonnal

Sew watches/warnings/advisories
Wa... Winter weather advisory until 10 am pdt this morning for
cascades of whatcom and skagit counties.

Pz... Small craft advisory until 6 pm pdt this evening for admiralty
inlet-coastal waters from point grenville to cape
shoalwater 10 to 60 nm-coastal waters from point grenville
to CAPE shoalwater out 10 nm-puget sound and hood canal-
west entrance u.S. Waters strait of juan de fuca.

Small craft advisory for rough bar until 6 pm pdt this evening
for grays harbor bar.

Small craft advisory from 8 am this morning to 6 pm pdt this
evening for coastal waters from CAPE flattery to james
island 10 to 60 nm-coastal waters from james island to
point grenville 10 to 60 nm.

Gale warning until 8 am pdt this morning for coastal waters from
cape flattery to james island 10 to 60 nm-coastal waters
from CAPE flattery to james island out 10 nm-coastal waters
from james island to point grenville 10 to 60 nm-coastal
waters from james island to point grenville out 10 nm.

Small craft advisory for hazardous seas from 8 am this morning
to 6 pm pdt this evening for coastal waters from cape
flattery to james island out 10 nm-coastal waters from
james island to point grenville out 10 nm.

Gale watch from this evening through late tonight for central
u.S. Waters strait of juan de fuca-east entrance u.S.

Waters strait of juan de fuca.

Gale warning until 9 am pdt this morning for east entrance u.S.

Waters strait of juan de fuca-northern inland waters
including the san juan islands.

Small craft advisory until 9 am pdt this morning for central
u.S. Waters strait of juan de fuca.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WPTW1 - 9441102 - Westport, WA 2 mi45 min SSW 19 G 26 50°F 49°F1009.6 hPa
46211 - Grays Harbor, WA (036) 9 mi53 min 50°F15 ft
TOKW1 - 9440910 - Toke Point, WA 13 mi45 min S 22 G 26 51°F 49°F1010.3 hPa
46243 - Clatsop Spit, OR - 162 46 mi45 min 51°F15 ft
46041 - CAPE ELIZABETH- 45NM Northwest of Aberdeen, WA 46 mi85 min S 19 G 21 50°F 50°F13 ft1007.5 hPa (-2.4)
ASTO3 - 9439040 - Astoria, OR 49 mi45 min S 14 G 21 52°F 46°F1012.1 hPa

Wind History for Westport, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hoquiam, Bowerman Airport, WA9 mi22 minS 181.25 miLight Rain Fog/Mist and Breezy51°F51°F100%1010.3 hPa

Wind History from HQM (wind in knots)
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2 days agoE11NE9NE12NE11E13NE9NE12NE8E6W10SW8S8S5SE6S15S5SE8SE9S7SE6SE11SE9S7SE6

Tide / Current Tables for Bay City, South Bay, Grays Harbor, Washington
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Bay City
Click for Map
Wed -- 02:32 AM PDT     10.79 feet High Tide
Wed -- 07:00 AM PDT     Sunrise
Wed -- 08:13 AM PDT     Moonrise
Wed -- 08:30 AM PDT     -0.41 feet Low Tide
Wed -- 03:02 PM PDT     10.12 feet High Tide
Wed -- 07:41 PM PDT     Sunset
Wed -- 08:40 PM PDT     0.70 feet Low Tide
Wed -- 09:55 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
7.59.510.610.69.26.841.4-0.2-0.213.25.77.99.510.19.57.65.12.71.10.81.83.9

Tide / Current Tables for Grays Harbor Entrance, Washington Current
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Grays Harbor Entrance
Click for Map
Wed -- 02:51 AM PDT     -0.01 knots Slack
Wed -- 06:10 AM PDT     -3.94 knots Max Ebb
Wed -- 07:00 AM PDT     Sunrise
Wed -- 08:13 AM PDT     Moonrise
Wed -- 09:19 AM PDT     0.00 knots Slack
Wed -- 12:10 PM PDT     2.84 knots Max Flood
Wed -- 03:23 PM PDT     -0.00 knots Slack
Wed -- 06:29 PM PDT     -3.39 knots Max Ebb
Wed -- 07:42 PM PDT     Sunset
Wed -- 09:27 PM PDT     0.01 knots Slack
Wed -- 09:55 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.82.41.4-0.3-2.2-3.4-3.9-3.6-2.4-0.61.12.32.82.620.7-1.1-2.6-3.3-3.3-2.5-0.80.92.2

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

GOES Local Image of PacificNorthwest    EDIT
Geos

Wind Forecast for Seattle, WA (11,2,3,4)
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Ground Weather Radar Station Portland, OR
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weather_mapweather_map weather_map

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Disclaimer:
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 L-36.com. 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 L-36.com 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.