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Marine Weather and Tides
Version 3.4 |
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports. 6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen |
| Sunrise 6:13AM | Sunset 8:08PM | Friday August 23, 2019 5:07 PM PDT (00:07 UTC) | Moonrise 11:03PM | Moonset 1:29PM | Illumination 41% |  |
PZZ135 Puget Sound And Hood Canal- 254 Pm Pdt Fri Aug 23 2019
Tonight..N wind 5 to 15 kt becoming S after midnight. Wind waves 2 ft or less.
Sat..S wind to 10 kt becoming nw in the afternoon. Wind waves 1 ft or less. A slight chance of showers.
Sat night..NE wind 10 to 20 kt. Wind waves 1 to 3 ft.
Sun..SE wind to 10 kt in the morning becoming light. Wind waves 1 ft or less.
Sun night..NE wind 5 to 15 kt becoming N to 10 kt after midnight. Wind waves 2 ft or less.
Mon..N wind to 10 kt becoming 5 to 15 kt in the afternoon. Wind waves 2 ft or less.
Mon night..NE wind to 10 kt. Wind waves 1 ft or less.
Tue..N wind to 10 kt. Wind waves 1 ft or less.
Wed..N wind to 10 kt. Wind waves 1 ft or less.
Tonight..N wind 5 to 15 kt becoming S after midnight. Wind waves 2 ft or less.
Sat..S wind to 10 kt becoming nw in the afternoon. Wind waves 1 ft or less. A slight chance of showers.
Sat night..NE wind 10 to 20 kt. Wind waves 1 to 3 ft.
Sun..SE wind to 10 kt in the morning becoming light. Wind waves 1 ft or less.
Sun night..NE wind 5 to 15 kt becoming N to 10 kt after midnight. Wind waves 2 ft or less.
Mon..N wind to 10 kt becoming 5 to 15 kt in the afternoon. Wind waves 2 ft or less.
Mon night..NE wind to 10 kt. Wind waves 1 ft or less.
Tue..N wind to 10 kt. Wind waves 1 ft or less.
Wed..N wind to 10 kt. Wind waves 1 ft or less.
PZZ100 254 Pm Pdt Fri Aug 23 2019
Synopsis for the northern and central washington coastal and inland waters..A weak cold front will dissipate over the coastal waters tonight and Saturday. Otherwise, onshore flow will continue through early next week with high pressure offshore and lower pressure inland. Low level flow will turn offshore on Tuesday as a thermal trough builds north along the west coast.
Synopsis for the northern and central washington coastal and inland waters..A weak cold front will dissipate over the coastal waters tonight and Saturday. Otherwise, onshore flow will continue through early next week with high pressure offshore and lower pressure inland. Low level flow will turn offshore on Tuesday as a thermal trough builds north along the west coast.
7 Day Forecast for Marine Location Near Snoqualmie, WA
Hourly EDIT Helplocation: 47.53, -121.84 debug
Area Discussion for - Seattle, WA
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus66 ksew 232113 afdsew area forecast discussion national weather service seattle wa 213 pm pdt Fri aug 23 2019 Synopsis A trough of low pressure will slowly move across central bc through the weekend. This will bring a few showers and near to below normal temperatures for western washington. The trough will slide east and high pressure will build in behind it by Sunday and into early next week. Low level offshore flow will develop by mid week and produce well above normal temperatures and dry conditions. Short term tonight through Monday Satellite and radar depict the steady eastward progress of the showers across the northern tier of the forecast area this afternoon. Rainfall totals were highest across the san juans and whatcom county. Peak totals of about .10 to .20 inches were observed in those areas. Measurable rain appears to have been recorded as far south as line from port angeles to marysville, with dry and partly cloudy conditions south of there. A decrease in shower activity is expected this afternoon with most areas dry by sunset. Precipitable water values drop off as the atmosphere briefly dries out this evening. However it is short lived as rain showers should develop again off the coast late tonight and likely reach the coast by sunrise on Saturday. There will be a low chance for showers across the area on Saturday with the greatest chance being over the olympic peninsula and coast earlier in the day. This activity will not be significant but the showers and clouds will help to keep temperatures below normal for many areas on Saturday. The troughing will be slow to move east and leave the area open for a few more showers Sunday across the far northern areas closest to canada. But otherwise it will remain cloudy with highs lingering near normal. A change in the pattern will take place overnight Sunday and into Monday. The trough of low pressure will finally exit well east of the area. This will permit a ridge of mid level high pressure which has been lingering well south of the area to begin building north. Heights will rise quite a bit overnight Sunday and into Monday and so Monday will be a much drier day with temperatures bumping up about 5 degrees from Sunday to reach near or slightly above normal. Long term Tuesday through Friday This warming trend will continue through midweek. Heights will continue to climb and crest in the 585-588dm range. 850mb temps will climb as well to around 18-20c by Tuesday evening with winds becoming more favorable for supporting low level warmth. Highs on Tuesday are expected about 10 degrees warmer than Monday, so should be well above normal with lots of Sun and lower to mid 80s. Wednesday looks to be the hottest day at present as 850mb temps crest in the +20 to +23c range with low level offshore flow. This suggests highs in the mid to upper 80s with readings near 90 possible from seattle to the south for some late summer heat. Current heat impact levels indicate some impacts for vulnerable populations but not hot enough for more widespread concerns at this time. Record highs for seattle on t-w-th are 88,95,91 and so those appear to be safe. Thursday looks set to be a cooler day, by at least a few degrees if not more. Heights fall and 850mb temps do as well. There is some suggestion of some precip even in the area so the temperature drop may be even more than current forecasts indicate. At present have shows the greatest cooling on the coast and a few degrees of cooling inland but will have to monitor trends in the extended. Friday at this point looks like it may remain above normal across the interior so have left forecast highs in the 80s as the details |
on breakdown of the warmer pattern looks to be a bit in question. Aviation A weak system passing across the northern half of the state today has brought widespread mid and high level cloud cover to the terminals today, with a widespread area light to moderate rainfall from roughly clallam co into skagit and whatcom counties. Most of the activity was confined to kclm and kbli, with some brief reductions in CIGS and vsbys. The majority of the rain has moved east and dry conditions are expected for the remainder of today, with any cig and or vsby reductions rapidly improving. All other TAF sites have beenVFR with ceilings generally above 10k ft under no vsby restrictions. This will continue to be the case thru the evening and part of the overnight. Low level marine stratus will develop along the coast and push inland some, likely reaching khqm and kolm but may spare the sound terminals with perhaps coverage capping at few by daybreak. Clouds should then lift and scatter some into the afternoon. N NE winds 10kts or less this afternoon will become light overnight and gradually veer to the S sw through the day Saturday at again 10kts or less. Ksea...VFR ceilings through the evening and much of the overnight. A few MVFR stratus may move into the vicinity of the airfield by daybreak Saturday. Winds N NE 10kts or less into the overnight hours, veering S SW by Saturday afternoon under 10kts. Kovacik Marine Quasi-zonal to weak troughing pattern will hang in place in the mid and upper levels tonight and Saturday, while at the surface, onshore flow will continue as higher pressure remains located offshore and lower pressure remains inland. A weak shortwave trough embedded in the mid level flow is skirting this region today. With it has been a rather widespread area of light to moderate rainfall across mainly the strait of juan de fuca and the northern inland waters. Most of this activity is currently pushing east as of 21z and will continue to clear the waters thru the remaining hours of the afternoon. Wind and waves have remained rather tranquil so far today. By late afternoon early evening, gradients will strengthen enough to produce small craft advisory level winds down the central and eastern strait. These winds will last thru much of the night and may bleed into the adjacent northern inland waters where a small craft advisory has been issued with this forecast update to account for this. Winds will ease across these waters Saturday morning tho there could be an observation or two of small craft winds in the strait between 12-18z . Onshore flow will continue with little change in the synoptic pattern, although a weak front will cross the local area. In its wake, a stronger westerly push down the strait is possible. Winds in latest guidance are capped at 30kts or below so will hold off on a gale watch but the evening and midnight shifts may need to issue if gradients continue to look strong. Onshore flow looks to continue through Monday before shifting to offshore as a thermal trough builds north from california. The offshore flow pattern may then last thru much of the week. Kovacik Hydrology The daily hydrology discussion has ended until the start of the next rainy season; it will only be updated as needed until then. Sew watches warnings advisories Wa... None. Pz... Small craft advisory from 4 pm this afternoon to 3 am pdt Saturday for central u.S. Waters strait of juan de fuca- east entrance u.S. Waters strait of juan de fuca. |
Weather Reporting Stations
EDIT (on/off) Help NOTE: Click on distance to see the station location on a map| Stations | Dist | Age | Wind | Air Temp | Water Temp | Waves | Pressure | DewPt |
| WPOW1 - West Point, WA | 33 mi | 67 min | NE 8 G 8 | 63°F | 1013.8 hPa (-1.3) | 54°F | ||
| 46120 | 34 mi | 43 min | 62°F | 1012.4 hPa | 54°F | |||
| TCMW1 - 9446482 - Tacoma Met, WA | 35 mi | 55 min | W 6 G 7 | |||||
| TCNW1 - 9446484 - Tacoma, WA | 35 mi | 55 min | 70°F | 56°F | 1013.6 hPa |
Wind History for Seattle, Puget Sound, WA, WA
(wind in knots) EDIT (on/off) Help| Last 24hr | ||||||||||||||||||||||||
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| 2 days ago |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports. Follow links for more data.| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| Renton Municipal Airport, WA | 20 mi | 74 min | NNW 6 | 9.00 mi | Mostly Cloudy | 72°F | 55°F | 55% | 1013.7 hPa |
| Boeing Field - King County International Airport, WA | 24 mi | 74 min | Var 4 | 10.00 mi | Mostly Cloudy | 71°F | 52°F | 51% | 1013.3 hPa |
Link to 5 minute data for KRNT
Wind History from RNT (wind in knots)
| 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | 12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | |
| Last 24hr | S | SE | SE | SE | Calm | Calm | SE | Calm | Calm | N | N | NW | N | NW | N | N | ||||||||
| 1 day ago | Calm | Calm | Calm | NW | N | N | N | SW | S | Calm | S | S | S | S | Calm | Calm | NW | Calm | Calm | |||||
| 2 days ago | SW | SW | S | SE | S | Calm | S | S | Calm | SW | SW |
Tide / Current Tables for Duwamish Waterway, Washington
EDIT Weekend mode (on/off) (on/off) Help One Week of DataDuwamish Waterway
Click for Map
Fri -- 05:24 AM PDT 1.70 feet Low Tide
Fri -- 06:15 AM PDT Sunrise
Fri -- 07:58 AM PDT Last Quarter
Fri -- 12:02 PM PDT 8.22 feet High Tide
Fri -- 02:30 PM PDT Moonset
Fri -- 05:15 PM PDT 5.68 feet Low Tide
Fri -- 08:07 PM PDT Sunset
Fri -- 10:49 PM PDT 9.72 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Fri -- 05:24 AM PDT 1.70 feet Low Tide
Fri -- 06:15 AM PDT Sunrise
Fri -- 07:58 AM PDT Last Quarter
Fri -- 12:02 PM PDT 8.22 feet High Tide
Fri -- 02:30 PM PDT Moonset
Fri -- 05:15 PM PDT 5.68 feet Low Tide
Fri -- 08:07 PM PDT Sunset
Fri -- 10:49 PM PDT 9.72 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
| 12 am | 1 am | 2 am | 3 am | 4 am | 5 am | 6 am | 7 am | 8 am | 9 am | 10 am | 11 am | 12 pm | 1 pm | 2 pm | 3 pm | 4 pm | 5 pm | 6 pm | 7 pm | 8 pm | 9 pm | 10 pm | 11 pm |
| 8.8 | 7.3 | 5.6 | 3.9 | 2.5 | 1.8 | 1.9 | 2.7 | 4.1 | 5.6 | 7 | 7.9 | 8.2 | 8 | 7.5 | 6.8 | 6.1 | 5.7 | 5.9 | 6.6 | 7.6 | 8.7 | 9.5 | 9.7 |
Tide / Current Tables for Des Moines, Washington
EDIT (on/off) Help One Week of DataDes Moines
Click for Map
Fri -- 05:21 AM PDT 1.81 feet Low Tide
Fri -- 06:16 AM PDT Sunrise
Fri -- 07:58 AM PDT Last Quarter
Fri -- 12:06 PM PDT 8.73 feet High Tide
Fri -- 02:30 PM PDT Moonset
Fri -- 05:12 PM PDT 6.04 feet Low Tide
Fri -- 08:07 PM PDT Sunset
Fri -- 10:53 PM PDT 10.32 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Fri -- 05:21 AM PDT 1.81 feet Low Tide
Fri -- 06:16 AM PDT Sunrise
Fri -- 07:58 AM PDT Last Quarter
Fri -- 12:06 PM PDT 8.73 feet High Tide
Fri -- 02:30 PM PDT Moonset
Fri -- 05:12 PM PDT 6.04 feet Low Tide
Fri -- 08:07 PM PDT Sunset
Fri -- 10:53 PM PDT 10.32 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
| 12 am | 1 am | 2 am | 3 am | 4 am | 5 am | 6 am | 7 am | 8 am | 9 am | 10 am | 11 am | 12 pm | 1 pm | 2 pm | 3 pm | 4 pm | 5 pm | 6 pm | 7 pm | 8 pm | 9 pm | 10 pm | 11 pm |
| 9.3 | 7.8 | 6 | 4.1 | 2.6 | 1.9 | 2 | 2.9 | 4.3 | 5.9 | 7.4 | 8.4 | 8.7 | 8.5 | 8 | 7.2 | 6.5 | 6.1 | 6.2 | 7 | 8.1 | 9.2 | 10 | 10.3 |
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.
Link to Loop
Other links: Northern Pacific Contential US Full GOES-East
Wind Forecast for Seattle, WA (20,4,5,8)
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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. |