Thursday, March21, 2019 L-36.com


Marine Weather and Tides
Snoqualmie, WA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:07AMSunset 7:23PM Thursday March 21, 2019 5:29 AM PDT (12:29 UTC) Moonrise 7:26PMMoonset 6:55AM Illumination 100% Phase: Full Moon; Moon at 15 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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PZZ135 Puget Sound And Hood Canal- 233 Am Pdt Thu Mar 21 2019
Today..S wind 10 to 20 kt becoming sw in the afternoon. Wind waves 1 to 3 ft.
Tonight..Variable wind 5 to 15 kt becoming S after midnight. Wind waves 2 ft or less.
Fri..S wind 5 to 15 kt rising to 15 to 25 kt in the afternoon. Wind waves 2 ft or less building to 2 to 4 ft in the afternoon. A slight chance of rain in the morning then a chance of rain in the afternoon.
Fri night..S wind 15 to 25 kt. Wind waves 2 to 4 ft.
Sat..SW wind 5 to 15 kt becoming S in the afternoon. Wind waves 2 ft or less.
Sat night..NW wind 5 to 15 kt becoming N after midnight. Wind waves 2 ft or less.
Sun..Light wind becoming N to 10 kt. Wind waves 1 ft or less.
Mon..N wind 5 to 15 kt becoming s. Wind waves 2 ft or less.
PZZ100 233 Am Pdt Thu Mar 21 2019
Synopsis for the northern and central washington coastal and inland waters..Southerly flow over the coastal waters with developing onshore flow through the strait. A weak front will reach area waters on Friday with strengthening southerlies and significant westerly swell over the coastal waters and west entrance to the strait of juan de fuca Friday night and Saturday.


7 Day Forecast for Marine Location Near Snoqualmie, WA
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location: 47.53, -121.84     debug


Area Discussion for - Seattle, WA
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Fxus66 ksew 210932
afdsew
area forecast discussion
national weather service seattle wa
232 am pdt Thu mar 21 2019

Synopsis Low level onshore flow will bring some marine air
inland today resulting in high temperatures nearly 15 degrees
cooler than Wednesday. There will also be an increase in cloud
cover, especially along the coast. A front will bring light rain
and breezy to windy conditions to the area later Friday into
Friday night. Showers and cool conditions are expected on
Saturday. After a dry day on Sunday, another front will move
northeast across the area on Monday.

Short term today through Saturday Areas from about seattle
southward in the interior and along the coast are seeing the
effects of a shallow marine layer this morning. Winds are more
west to southwest, temperatures are mainly in the 40s to lower
50s, and some stratus is being seen along the coast and in the
chehalis gap west of shelton. Conditions from about everett
northward in the interior is seeing the last gasps of dry
northeasterly flow with exposed locations in the mid 50s and
dewpoint temperatures mainly in the 20s to mid 30s. The marine air
will continue to move northward today, but it will not be deep
enough to provide any cloud to the interior north of seattle. Mid
and high level clouds will spread into the area from the southeast
as an upper level low moves inland to the south of the area. Highs
today will be quite a bit cooler than what we saw on Wednesday
with highs in the lower to mid 60s in most of the interior and
only in the upper 50s on the coast.

Clouds will develop and spread into the area from the south and
southwest tonight as the marine layer deepens. Lows tonight will
be more uniform than what we have seen recently with mainly 40s
across the region.

Clouds will thicken from the south on Friday with rain spreading
ne across the area during mainly the afternoon and overnight
hours. Light offshore flow may result in high temperatures
reaching around 60 on Friday before the rain starts.

The combination of a weak upper level trough and onshore flow will
give a cool and showery day to the area on Saturday with
temperatures near normal for late march. Albrecht

Long term Sunday through Wednesday Forecasts for Sunday will
continue to favor the more consistent and drier ECMWF model today
that shows a weak upper trough moving NE of the area Sunday
afternoon and low level flow becoming offshore. Current thinking
is that forecast highs on Sunday will be in the 50s to around 60.

Another NW SE oriented front will lift northeast across the area
later Monday or Monday night as high pressure remains over the
canadian prairies and a strong jet stream pushes systems mainly
into california. The remainder of the period during the early to
middle part of next week will see clouds and a chance of showers
as systems rotate around a trough to the south of the area and get
blocked from moving off to the north by high pressure over western
canada. The extended forecast represents a model blend today.

Albrecht

Aviation Satellite imagery reveals generally clear skies over
western washington early this morning, with some MVFR stratus
popping up over hqm. Aside from some passing cirrus, skies should
remain fairly clear into the morning hours. Clouds will then be on
the increase quickly from the south, tho should remainVFR. A stray
shower would be not impossible this afternoon, especially across
southern TAF sites. The next frontal system will be moving towards
the area tonight and into Friday, providing a much better chance for
showers. Winds will remain on the south side through the period at
under 10 kts.

Ksea...VFR conditions with clouds increasing through the day.

Conditions should remain mostly dry. Winds SE but will likely dance
between SE and SW through much of the period. Speeds under 10kts.

Kovacik

Marine Southerly flow over the coastal waters will support small
craft advisory conditions this morning, with developing onshore flow
through the strait. Winds and seas will ease tonight ahead of a
frontal system that will move into area waters Friday bringing
strengthening southerlies and significant westerly swell, 10 to
12 feet, Friday night rising to 14 feet at 16 seconds Saturday.&&

Hydrology River flooding is unlikely over the next seven days.

Sew watches warnings advisories
Wa... None.

Pz... Small craft advisory until 11 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-coastal waters from point grenville to cape
shoalwater 10 to 60 nm-coastal waters from point grenville
to CAPE shoalwater out 10 nm.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WPOW1 - West Point, WA 33 mi89 min S 8.9 G 9.9 50°F 1016 hPa (+1.1)41°F
46120 34 mi56 min S 1.9 51°F 1014.9 hPa41°F
TCMW1 - 9446482 - Tacoma Met, WA 35 mi47 min ESE 1 G 1.9
TCNW1 - 9446484 - Tacoma, WA 35 mi47 min 47°F 48°F1017.1 hPa
46125 49 mi45 min 3.9 47°F 1015.3 hPa42°F

Wind History for Seattle, Puget Sound, WA, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Renton Municipal Airport, WA20 mi36 minE 410.00 miFair47°F33°F59%1017 hPa
Boeing Field - King County International Airport, WA24 mi36 minSE 810.00 miFair49°F32°F52%1016.3 hPa

Wind History from RNT (wind in knots)
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Last 24hr3NW6NW6NW11NW10NW12NW86
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SE5CalmS3E3E4SE7SE3E3E4
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SE73NW64NW7
2 days agoCalmN4N6N6NW11NW10NW7NE8E9
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E5SE4E5SE3NE5N5E5CalmCalmNW5

Tide / Current Tables for Duwamish Waterway, Washington
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Duwamish Waterway
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Thu -- 06:07 AM PDT     12.06 feet High Tide
Thu -- 07:10 AM PDT     Sunrise
Thu -- 07:56 AM PDT     Moonset
Thu -- 12:23 PM PDT     2.09 feet Low Tide
Thu -- 06:08 PM PDT     10.84 feet High Tide
Thu -- 07:23 PM PDT     Sunset
Thu -- 08:27 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.11.23.56.49.211.21211.610.27.95.43.32.22.43.75.98.210.110.810.49.174.52.3

Tide / Current Tables for Des Moines, Washington
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Des Moines
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Thu -- 06:11 AM PDT     12.80 feet High Tide
Thu -- 07:10 AM PDT     Sunrise
Thu -- 07:56 AM PDT     Moonset
Thu -- 12:20 PM PDT     2.22 feet Low Tide
Thu -- 06:12 PM PDT     11.51 feet High Tide
Thu -- 07:23 PM PDT     Sunset
Thu -- 08:27 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.11.33.76.89.711.912.812.410.98.55.73.52.32.546.38.710.611.511.19.77.44.82.4

Weather Map and Satellite Images
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GOES Local Image of PacificNorthwest    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Wind Forecast for Seattle, WA (8,2,3,4)
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Ground Weather Radar Station Seattle/Tacoma, WA
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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.