Marine Weather and Tides
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 7:25AM||Sunset 4:30PM||Monday January 20, 2020 11:45 PM PST (07:45 UTC)||Moonrise 4:44AM||Moonset 1:55PM||Illumination 16%|
7 Day Forecast for Marine Location Near Dover, IDHourly EDIT Help
Area Discussion for - Spokane, WA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS66 KOTX 210542 AFDOTX
Area Forecast Discussion National Weather Service Spokane WA 942 PM PST Mon Jan 20 2020
Our next opportunity for widespread precipitation will be Tuesday with a mix of rain and snow in the lowlands and light to moderate snow accumulations in the mountains. Another wet and mild storm system impacts the region late Wednesday through Friday bringing moderate to heavy precipitaiton. Heavy snow will be possible in the Cascades. The weekend will remain mild for mid January but with unsettled conditions increasing.
DISCUSSION. Tonight through Tuesday night: Satellite shows a deep 982mb surface low off the Washington coast. Models agree the low will weaken to around 995mb Tuesday afternoon as it swings northeast towards the north tip of Vancouver Island. This low will send an occluded front through the Inland NW reaching Central WA Tuesday morning and Eastern WA/N Idaho late Tuesday morning and afternoon. The earlier timing over Central WA is more favorable for valley snow, mainly north and west of Moses Lake including Wenatchee area, Cascades, and Okanogan Valley where wet bulb zero heights are down to the valley floors. Snow amounts are expected to be less than 2 inches for most except locally higher in the Cascades. For Moses Lake, Odessa, and Othello areas a warm layer aloft combined with surface temperatures expected to be near freezing for early to mid morning will provide an opportunity for a brief wintry mix of rain, snow, and a slight chance for freezing before temperatures warm above freezing by late morning. By the time precipitation reaches Eastern WA and N Idaho surface temperatures are expected to be in the mid to upper 30s in the valleys resulting in wet non-accumulating snow, or a rain/snow mix before changing to rain. The mountains will receive snow although the best chances for impacts on roads may hold off until the evening with marginal temperatures for road accumulations in the afternoon.
After the front passes, the trough axis swings through Tuesday night. Westerly flow and increased instability associated with cooling aloft will bring another round of snow to the Cascades and Idaho Panhandle with snow levels dropping back down to the valley floors. The GFS and NAM show the potential for bands of moderate/heavy snow to set up in the Cascades. Taking this into account combined with light to moderate snow expected during the day Tuesday has prompted a Winter Weather Advisory for the East Slopes of the Cascades mainly for the Cascade crest area (Highway 2 from Stevens Pass to Coles Corner). JW
Wednesday through Friday: The Pac NW will be hosed by an atmospheric river this week delivering a period of wet and increasingly mild conditions. There is good agreement amongst the deterministic and ensemble model solutions thus confidence is above normal at this time. The fetch of subtropical moisture originates well past the Dateline near the Philippine Sea and will be ushered into the region by a strong warm front Wednesday evening and night. By Thursday, precipitable water values will near three quarters of an inch or higher or roughly 220-250% of normal for this time of year. Current impacts at this time include the potential for heavy snow in the Cascades, a wintry mix of snow and freezing rain north of a line from Wenatchee to Republic, and minor urban flooding in areas where snow/ice could be preventing proper drainage for the incoming lowland rains.
Cooler air left in the wake of Tuesday's trough passage will allow snow levels to start off low and near most valley floors. Lingering instability and orographic flow will continue to bring scattered light snow showers across the Idaho Panhandle Wednesday morning and early afternoon but look for this activity to fade by the afternoon as the moisture laden warm front crosses into Central WA. A large shield of precipitation will expand into Central and Southern Washington by Wednesday afternoon and continue to expand northward into Northeastern areas of Washington and North Idaho Wednesday evening. The late timing of the precipitation into NE WA/N ID suggest a low probability of impactful snow and quicker transition to rain yet cannot rule out a inch or two before this transition for locations like Colville, Ione, and Bonners Ferry. For Okanogan Country, the Highway 97 corridor from Omak to Wenatchee, and East Slopes of the Cascades, the cooler air will be much more stubborn to mix out and leads to lower confidence for exact snow amounts, freezing rain potential, and exact timing for the switch to rain. Utilizing a blend of the NAM/GFS/EC thermodynamic profiles and afternoon timing of the precipitation, thinking the potential for 1-3" along the Highway 97 corridor as well as the Waterville Plateau, and Republic Area. Heavier snow amounts of 4-8" are expected into the East Slopes with amounts increasing closer to a foot or more the closer you get to the crest. Periods of freezing rain will also be possible along the Wenatchee and Entiat River Valleys as the warmer air nudges northward but my confidence is low for impactful ice accumulations.
Snow levels along and south of the I-90 corridor will rise from around 2000 feet Wednesday afternoon to 5000-6000 feet Thursday morning/afternoon. Snow levels in the northern mountains will increase from the valley floors to around 4500-5000 feet. Looking at the 48 hour QPF amounts from the models indicate the potential for 0.50-1.00" north and east of a line from Moscow to Spokane to Republic and 0.35" or less south of this line. This is much more variation along the Highway 97 corridor from Wenatchee to Omak with amounts varying from 0.20-0.50" and increasing toward 2-3 inches (yes, inches) along the Cascade Crest. A lot of the snowpack in the region should be capable of absorbing this incoming rainfall as it has yet to be tested with warmer weather patterns but areas that have poor drainage from snow or ice such as urban areas could be susceptible to some flooding issues.
Saturday through Monday: A shortwave swings through the region late Friday ushering a weak maritime cold front through the region. The air mass will cool a few degrees but generally remain on the warm side of late January standards. Ties to the atmospheric river will become cut off through the weekend but precipitation chances will remain elevated as several weaker disturbances pass through. Despite losing ties to the subtropical moisture, the lack of dry air will keep PWATS around 100-150% of normal. Snow levels will range from around 3500 feet north to 5000 feet south. Conditions will remain sloppy and slushy with snow continuing to slowly melt in the lower elevations as afternoon highs peak in the upper 30s and 40s and lows only dipping into the low to mid 30s. The lack of wind should keep snow melt in check but the upcoming week will need to be monitored for any potential hydrology issues. Areas of low clouds and fog almost seem a certainty in this moist weather environment. /sb
AVIATION. 06Z TAFS: For the remainder of the night, the stratus and patchy fog will be confined to mainly the mountain valleys including around KEAT, as well as possibly KCOE. The next system arrives in the morning with light snow for KEAT and rain/snow mix for KMWH. There is a small chance of brief freezing rain for KMWH at the onset of the precip, but confidence isn't high. In Eastern WA and Northern ID, the rain will arrive around 18Z and likely to bring MVFR and/or IFR conditions with it. There could be brief rain/snow mix at GEG at onset. JS
PRELIMINARY POINT TEMPS/POPS. Spokane 31 38 32 38 35 42 / 10 100 20 20 60 70 Coeur d'Alene 32 39 33 38 35 41 / 10 100 40 20 60 70 Pullman 34 40 32 37 34 41 / 10 90 30 20 60 50 Lewiston 36 44 34 43 39 47 / 10 60 20 10 60 40 Colville 33 37 30 39 32 42 / 10 100 20 30 70 70 Sandpoint 31 37 33 37 34 41 / 20 100 70 40 70 80 Kellogg 34 38 33 37 34 42 / 20 100 70 50 70 80 Moses Lake 32 39 30 40 34 44 / 10 90 10 50 70 40 Wenatchee 30 36 30 36 32 39 / 10 90 20 60 80 60 Omak 30 34 29 35 33 39 / 10 90 20 40 80 60
OTX WATCHES/WARNINGS/ADVISORIES. ID . None. WA . Winter Weather Advisory from 4 AM Tuesday to 4 AM PST Wednesday for the cascade crest including highway 2 between coles corner and stevens pass for East Slopes Northern Cascades.
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports. Follow links for more data.
|Sandpoint, Sandpoint Airport, ID||3 mi||51 min||N 0||0.25 mi||Freezing Fog||30°F||30°F||100%||1013.9 hPa|
Link to 5 minute data for KSZT
Wind History from SZT (wind in knots)
|1 day ago||NE||NE||N||Calm||NE||N||NE||NE||Calm||Calm||Calm||NE||N||Calm||NE||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||NE|
|2 days ago||N||NE||Calm||Calm||NE||NE||NE||NE||NE||NE||NE||NE||N||NE||Calm||Calm||NE||Calm||Calm||Calm||Calm||Calm||Calm|
EDIT Weekend mode (on/off) (on/off)  Help
EDIT (on/off)  Help
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 Spokane, WA (2,6,7,8)(on/off)  Help
Ad by Google
I do not sell or share any user data or anything else for that matter. The only personal information I save is in the site log which has a line for each page view which includes the IP address your browser sends in the header as well as which page you requested. I use this to block hackers and other bad actors. I do not use this raw data to create profiles on users. I periodically delete the log files. If you are subject to CCPA, Google ads on this site will not be based on your past behavior so you will likely not see an ad for a lawn mower just because you looked for one at a big box website. I do not believe this site is subject to CCPA but I am doing what I can to follow the guidelines anyway.
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.