Marine Weather and Tides
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.
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 7:41AM||Sunset 4:25PM||Sunday December 8, 2019 4:58 AM PST (12:58 UTC)||Moonrise 2:48PM||Moonset 3:42AM||Illumination 88%|
7 Day Forecast for Marine Location Near Onalaska, WAHourly EDIT Help
Area Discussion for - Seattle, WA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS66 KSEW 081129 AFDSEW
Area Forecast Discussion National Weather Service Seattle WA 330 AM PST Sun Dec 8 2019
SYNOPSIS. An upper ridge will build offshore today for dry weather through early Tuesday with the best chances for sunshine being on Monday. The next system should slide through later Tuesday with unsettled conditions persisting thereafter.
SHORT TERM /TODAY THROUGH TUESDAY/. Current satellite and radar imagery show that system responsible for precip yesterday is out of the area with W WA now falling under the jurisdiction of an incoming upper level ridge still out over the offshore waters. Current obs show sufficient low level moisture is in place to keep low clouds over much of the area with areas of fog/reduced visibilities in some locations.
This upper level ridge will keep conditions dry today . but any sort of clearing is going to be slow work at best. Given the widespread low clouds/fog this morning . expecting cloudiness to linger most of the day . although the mountains may see some clearing as the day progresses. This ridge will be the main weather factor throughout the short term as dry conditions persist into Monday and early Tuesday. Clouds should give way to some breaks of sunshine during the day Monday . mostly for locations east of Puget Sound. The western half of the CWA will start to see clouds associated with the next weather system start to roll in which may limit the amount of sun they get. The next system makes its way to the coast by mid to late Tuesday morning but really doesn't make its way inland until Tuesday afternoon. Both ECMWF and GFS do not show this front being of any particular note and the ensemble mean leans toward that conclusion as well showing pretty minimal QPF values associated with its passage. Neither model has the system holding together very well and has a weak shortwave ridge in place over W WA by Tuesday night.
Lowland high temps throughout the short term will remain pretty static . generally in the upper 40s. Overnight lows will not see very much variation either . sitting in the upper 30s to around 40.
LONG TERM /WEDNESDAY THROUGH SATURDAY/. Models agree on a shortwave ridge for early Wednesday . although the ECMWF is more progressive on kicking it out and getting the next system onto the coast by late Wednesday morning . inland by Wednesday evening. The GFS is slower with the system hitting the coast in the afternoon and pushing inland overnight. Most of the ensemble members fall somewhere in between causing any forecast solution to get lost in the spaghetti.
Beyond this initial disagreement . models come back in line regarding the active pattern for the remainder of the forecast period as a broad upper level trough sets up over the Pac NW. This will shuttle in a series of systems and while both deterministic and ensemble models show some dry breaks . the overall pattern will be wet.
Temps in the long term do not waver much from those in the short term with the lowlands generally seeing high temps in the upper 40s to around 50 while overnight lows will sit generally in the upper 30s to lower 40s. SMR
AVIATION. North northwesterly flow aloft into Monday with upper level ridge offshore. Light flow in the lower levels with flat surface gradients. Air mass moist and stable.
Widespread ceilings below 1000 feet this morning with areas of visibility 1-3sm in fog and isolated visibility 1/2sm or less in fog. With little flow in the lower levels improvement will be slow with ceilings lifting to 1000-2000 feet and visibility 3-5sm around 20z. Visibility restrictions gone by 22z but ceilings remaining MVFR into early Monday morning. Ceilings lowering back down to below 1000 feet in most places after 09z Monday.
KSEA . Ceilings below 1000 feet and visibility 2-4sm in fog until around 20z. Ceilings lifting to 1000-2000 feet after 20z with no visibility restrictions. MVFR ceilings continuing into early Monday morning. Variable winds 6 knots or less. Felton
MARINE. Weak low pressure today will give way to high pressure by Monday with light winds. A front will approach the area on Tuesday and weaken over the area Tuesday night. Another stronger front should reach the area Wednesday night and push inland on Thursday.
HYDROLOGY. River flooding is unlikely for the next 7 days.
SEW WATCHES/WARNINGS/ADVISORIES. WA . None. PZ . None.
Weather Reporting StationsEDIT (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|
|LOPW1 - 9440422 - Longview, WA||33 mi||65 min||46°F||1014.3 hPa|
|TCMW1 - 9446482 - Tacoma Met, WA||54 mi||65 min||N 7 G 8|
|TCNW1 - 9446484 - Tacoma, WA||54 mi||65 min||49°F||52°F||1014.8 hPa|
Wind History for Longview, WA(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports. Follow links for more data.
|Chehalis-Centralia Airport, WA||22 mi||64 min||N 0||7.00 mi||Overcast||46°F||46°F||100%||1014.2 hPa|
Link to 5 minute data for KCLS
Wind History from CLS (wind in knots)
|1 day ago||S||S||Calm||Calm||Calm||Calm||Calm||W||Calm||Calm||Calm||Calm||Calm||E||Calm||Calm||S||S||S||S||S||Calm|
|2 days ago||Calm||Calm||N||N||Calm||Calm||S||S||S||Calm||NE||N||N||N||N||NE||N||Calm||Calm||N||Calm||NE||Calm||Calm|
EDIT Weekend mode (on/off) (on/off)  Help One Week of Data
EDIT (on/off)  Help One Week of Data
Weather Map(on/off)  Help Weather Map
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
Wind Forecast for Seattle, WA (7,2,3,4)(on/off)  Help
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