Wednesday, September30, 2020
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Marine Weather and Tides
Black Diamond, WA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 7:04AMSunset 6:52PM Tuesday September 29, 2020 9:24 PM PDT (04:24 UTC) Moonrise 5:35PMMoonset 3:32AM Illumination 96% Phase: Waxing Gibbous; Moon at 13 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- 838 Pm Pdt Tue Sep 29 2020
Tonight..N wind to 10 kt in the evening becoming light. Wind waves 1 ft or less.
Wed..SW wind to 10 kt. Wind waves 1 ft or less. Haze in the morning.
Wed night..Light wind becoming N to 10 kt after midnight. Wind waves less than 1 ft becoming 1 ft or less after midnight.
Thu..Light wind becoming N to 10 kt in the afternoon. Wind waves 1 ft or less.
Thu night..N wind to 10 kt. Wind waves 1 ft or less.
Fri..Light wind. Wind waves less than 1 ft.
Fri night..Light wind. Wind waves less than 1 ft.
Sat..Light wind. Wind waves less than 1 ft.
Sun..Light wind. Wind waves less than 1 ft.
PZZ100 838 Pm Pdt Tue Sep 29 2020
Synopsis for the northern and central washington coastal and inland waters..Low level offshore flow will continue today before turning weakly onshore Wednesday and persisting through the end of the week. Westerly swell along the coastal waters will continue to subside to 5 feet into Wednesday, before increasing to 7 to 9 feet again on Thursday.


7 Day Forecast for Marine Location Near Black Diamond, WA
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location: 47.3, -122     debug


Area Discussion for - Seattle, WA
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FXUS66 KSEW 300335 AFDSEW

Area Forecast Discussion National Weather Service Seattle WA 835 PM PDT Tue Sep 29 2020

UPDATE. The current forecast remains on track this evening and no changes are planned. Mid-level smoke has encroached upon western Washington this evening and will remain during the overnight hours. Smoke is not expected to affect visibility or air quality as it will remain rather diffuse and aloft.

Pullin

PREV DISCUSSION. /issued 302 PM PDT Tue Sep 29 2020/

SYNOPSIS . Smoke from California fires is making its way into Western Washington. This smoke will mainly be aloft and the air quality index is expected to remain in the good category. The skies are expected to become hazy starting this evening. Overall, the ridge of high pressure should stay in place over the area for the next few days. Expect an unseasonably warm start to October.

SHORT TERM /TONIGHT THROUGH FRIDAY/ . The upper level ridge that has been over us the last few days is expected to remain in place through Friday. At the surface, light offshore flow throughout most of Wednesday. This will keep high temperatures in the upper 70s to low 80s for much of the area. The smoke aloft is rather disperse and not within the entire atmospheric column, as a result we do not think this will have a large impact on our high temperatures tomorrow. Surface winds will become more westerly starting Wednesday evening. With the added marine moisture patchy fog is likely for Wednesday into Thursday. This is especially true for the near coastal areas. While that upper level ridge stays in place, the onshore surface flow may bring in a few more clouds and lower the high temperatures a few degrees. However, the high temperatures are still expected to be around 10 degrees higher than the normal for the first of October. The axis of the ridge will begin to move eastward by Friday, but with offshore flow, mostly clear skies and warm temperatures will continue for the start of the weekend.

LONG TERM /SATURDAY THROUGH TUESDAY/ . A small upper level disturbance will be moving through the area on Saturday into Sunday. This will bring some cloudier skies and more seasonable temperatures by Sunday. No precipitation is expected for this weekend. After that shortwave passes, another ridge of high pressure will build over the area. Meaning another slight warmup for the start of the week.

Butwin

AVIATION . An upper level ridge will continue to reside across the Pacific Northwest through the TAF period. Winds aloft are westerly, while offshore flow continues in the low levels. Satellite imagery currently shows clear skies across the region, with some smoke from the northern California wildfires starting to make its way towards the southern Washington coast. Smoke will continue to make its way northward into the region this evening and into Wednesday, however is expected remain aloft, so do not expect any significant visibility reductions near the surface for area terminals. Main impact of the smoke will be the potential a 5000-7000 ft ceiling spreading across the region this evening.

KSEA . VFR conditions. N/NE winds will continue at 12 knots or less through this evening before becoming light and variable overnight.

Borth

MARINE . Offshore flow will continue this afternoon and evening as low pressure at the surface resides along the Washington coast and high pressure persists across the Intermountain West. Flow will then gradually transition onshore through the day Wednesday as high pressure returns and resides just offshore. This pattern looks to remain in place through the remainder of the week, allowing for stratus to return to the coastal waters and for weak diurnal pushes to occur down the Strait of Juan de Fuca.

Satellite imagery has indicated that smoke from the northern California wildfires has started to advect its way northward today. Expect smoke to make its way across the coastal waters and then gradually move inland across area waters into Wednesday. Smoke will remain aloft, so do not expect any reduction in visibilities across area waters.

Wave heights along the coastal waters will continue to subside to 5 feet into Wednesday, before increasing to 7 to 9 feet again by Thursday.

Borth

FIRE WEATHER . With a very persistent ridge over Washington, warmer than normal temperatures and dry conditions are expected for the next 7 days. With the wetting rain we received last week, and minimum relative humidity values continuing to increase throughout the period, fire weather concerns are low.

Butwin

HYDROLOGY . No flooding is expected on area rivers through the next 7 days.

SEW WATCHES/WARNINGS/ADVISORIES. WA . None. PZ . None.

www.weather.gov/seattle


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TCMW1 - 9446482 - Tacoma Met, WA 22 mi54 min W 4.1 G 5.1
TCNW1 - 9446484 - Tacoma, WA 22 mi54 min 63°F 56°F1017.7 hPa
WPOW1 - West Point, WA 34 mi84 min NNE 6 G 6 60°F 1017.3 hPa (+0.5)57°F
46120 38 mi38 min N 1.9 62°F 1016.4 hPa55°F
46121 39 mi38 min 1.9 63°F 1017.2 hPa58°F

Wind History for Tacoma MET, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Renton Municipal Airport, WA18 mi31 minN 010.00 miFair63°F57°F81%1017.5 hPa
Seattle, Seattle-Tacoma International Airport, WA19 mi31 minNNW 310.00 miA Few Clouds65°F55°F73%1018.1 hPa
Pierce County-Thun Field, WA20 mi2.8 hrsN 010.00 miFair70°F60°F73%1016.9 hPa
Boeing Field - King County International Airport, WA22 mi31 minN 010.00 miFair65°F55°F70%1017.1 hPa

Link to 5 minute data for KRNT

Wind History from RNT (wind in knots)
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Last 24hrNW11N12N9NW11NW11N9N7NW9N11N10N10N10N7N8N6N7NW7NW8NW7NW6NW4CalmCalmCalm
1 day agoN4N4N5N6N4CalmCalmCalmN7N8CalmN6N3NW4NW6NW8NW9NW10NW10NW10NW12NW11NW10NW10
2 days agoCalmS4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmN3N3NW5N6NW10NW8NW9NW9NW9N7N5N3

Tide / Current Tables for Des Moines, Washington
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Des Moines
Click for Map
Wed -- 04:44 AM PDT     9.84 feet High Tide
Wed -- 05:39 AM PDT     Moonset
Wed -- 07:07 AM PDT     Sunrise
Wed -- 10:59 AM PDT     1.45 feet Low Tide
Wed -- 05:35 PM PDT     11.46 feet High Tide
Wed -- 06:49 PM PDT     Sunset
Wed -- 06:55 PM PDT     Moonrise
Wed -- 11:38 PM PDT     3.21 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.35.47.18.69.69.89.27.75.73.521.423.65.98.310.211.311.410.58.76.64.63.4

Tide / Current Tables for Tacoma, Commencement Bay, Washington
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Tacoma
Click for Map
Wed -- 04:46 AM PDT     9.94 feet High Tide
Wed -- 05:39 AM PDT     Moonset
Wed -- 07:08 AM PDT     Sunrise
Wed -- 10:59 AM PDT     1.45 feet Low Tide
Wed -- 05:37 PM PDT     11.57 feet High Tide
Wed -- 06:49 PM PDT     Sunset
Wed -- 06:56 PM PDT     Moonrise
Wed -- 11:38 PM PDT     3.21 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.35.47.18.79.79.99.37.85.83.621.423.65.98.310.311.411.510.68.96.64.63.4

Weather Map
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wmap_P
GEOS 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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station Seattle/Tacoma, WA
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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 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 numerous 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.