Marine Weather and Tides
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.
|Sunrise 5:47AM||Sunset 8:39PM||Friday May 26, 2017 12:18 AM PDT (07:18 UTC)||Moonrise 5:57AM||Moonset 8:47PM||Illumination 1%|
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|PZZ450 Pt St George To Cape Mendocino Out 10 Nm- 833 Pm Pdt Thu May 25 2017 |
.small craft advisory in effect until 3 am pdt Friday...
Tonight..SW winds 5 to 10 kt. Waves N 9 ft at 7 seconds. Patchy fog.
Fri..S winds 5 to 10 kt. Waves N 2 ft at 6 seconds...and nw 6 ft at 10 seconds. Patchy fog.
Fri night..SW winds 5 to 10 kt. Waves nw 5 ft at 9 seconds. Patchy fog.
Sat..W winds up to 5 kt. Waves nw 5 ft at 9 seconds.
Sat night..NW winds 5 kt. Waves nw 4 ft at 11 seconds.
Sun..NW winds 5 to 10 kt. Waves nw 3 ft at 5 seconds...and nw 4 ft at 11 seconds.
Mon..NW winds 10 to 15 kt. Waves nw 4 ft at 5 seconds...and nw 2 ft at 14 seconds.
Tue..NW winds 5 to 15 kt. Waves N 4 ft at 5 seconds...and nw 2 ft at 13 seconds.
|PZZ400 833 Pm Pdt Thu May 25 2017 |
Synopsis for northern california waters..North winds and steep seas will continue to diminish tonight. Light winds are expected for Fri, but seas will remain steep and uncomfortable. Light winds and lower seas are expected for Sat and Sun. North winds will increase again by Monday.
7 Day Forecast for Marine Location Near Westhaven-Moonstone, CAHourly EDIT Help
Area Discussion for - Eureka, CA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus66 keka 252349|
area forecast discussion
national weather service eureka ca
449 pm pdt Thu may 25 2017
Synopsis An upper-level trough passing by to our northeast
will keep temperatures a few degrees below seasonal values through
Saturday morning, before ridging aloft builds across the region
through at least the first half of next week. This ridge will also
bring warmer temperatures to the region, especially across the
Update Stratus coverage over mendocino county has remained
slightly more widespread than previously expected so have adjusted
to forecast to start out with more clouds. In humboldt county
expect this evening clouds wills start to fill in faster than
previously expected. Tomorrow clouds may be slow to clear out due
to the deep marine so have adjusted them slightly as well. Mkk
Prev discussion issued 240 pm pdt Thu may 25 2017
discussion... Short term... (tonight through Friday night)
look for a repeat performance of our weather tonight, as stratus
will build inland through the some of the interior valleys and along
the coast. Here, these clouds will help insulate the ground, keeping
overnight temperatures a little warmer. Otherwise, look for
temperatures to fall into the 40s tonight, with the colder readings
found across the interior east of the coastal range. Clouds will
gradually burn off by the late morning early afternoon hours where
stratus does develop.
Temperatures on Friday afternoon will be similar to today along the
coast. However, with a trough axis taking its time to cross the
forecast area, highs across the interior will be a little cooler
compared to today. More coastal valley stratus looks to develop
Friday night, in the typically prone areas.
(Saturday through Thursday)
increasing temperatures and mainly dry conditions will be the main
theme for the weekend. The aforementioned trough axis will exit the
area to our east, with ridging aloft building across the region
through the first half of Monday. Increasing heights and warming
temperatures will provide seasonably warm conditions along the
coast, while interior locations warm several degrees, with a few
spots climbing into the 90s by Sunday Monday.
The forecast become a little more interesting for the latter half of
the weekend into early next week as well concerning convective
potential. The models continue to show precipitation developing
across the yolla bollys and near the trinity alps on Sunday and
Monday. They do show lifted indices dropping into the -3 to -6
range with mlcapes of 750 to 1500 j kg. Even so, i'm having trouble
buying into this as ridging will be prevalent, with no vort maxes|
seen anywhere nearby. With that in mind, it does look like
convective temperatures could be approached or breached, but again,
confidence in this occurring isn't all that high. So for now, the
forecast was largely unchanged.
The tail end of a trough passing by to our north may increase rain
chances for locations north of highway 299 if the GFS solution
verifies. Otherwise, the net effect from the trough will be some
cooling aloft, allowing afternoon highs to drop a few degrees for
the middle to end of the work week. Pd
along the coast near coastal valleys north of CAPE mendocino, marine
clouds gave way to mostly sunny skies earlier than yesterday. A
vibrant northerly flow kept skies clear at the cec air terminal.
However at acv and the humboldt bay area, MVFR-ifr conditions
persisted until around noonday with mostly light and variable winds.
Speaking of winds... Although the northerly flow will remain somewhat
robust, winds will not be as strong as yesterday. Will keep with
persistence as guidance showing no significant changes. Therefore
marines clouds expected to return to the coast this by late
Inland: a pronounced marine layer spilled into river valleys
especially in mendocino where the whole county was inundated with
nearly a 100% blanket of CIGS 010-025. Clouds were fairly slow to
erode, but finally eroded west over the coastal hills mountains and
into the anderson valley as shown on the 1pm vis Sat picture. The
marine layer will remain deep enough that stratus will again spill
and spread into the uki valley including the uki air terminal
winds and seas in the coastal waters have been slowly
diminishing today. Winds and seas will continue to subside tonight.
Lighter winds and lower seas are expected for Fri through Sat as
broad low pressure develops over the waters. Light n-nw winds will
return for Sunday and Monday.
Eka watches warnings advisories
Northwest california coastal waters... Small craft advisory until 6 pm pdt this evening for pzz450-475.
Hazardous seas warning until 6 pm pdt this evening for pzz450-
Gale warning until 6 pm pdt this evening for pzz470.
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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|
|46244 - Humboldt Bay, North Spit, CA||18 mi||28 min||51°F||10 ft|
|HBYC1 - 9418767 - North Spit, CA||21 mi||49 min||NNW 2.9 G 5.1||51°F||50°F||1012.1 hPa|
|46022 - EEL RIVER - 17NM West-Southwest of Eureka, CA||32 mi||89 min||N 9.7 G 14||53°F||52°F||8 ft||1011.2 hPa (+1.2)||49°F|
|CECC1 - 9419750 - Crescent City, CA||48 mi||49 min||SSE 20 G 26||51°F||55°F||1009.8 hPa|
Wind History for North Spit, Humboldt Bay, CA(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Arcata / Eureka, Arcata Airport, CA||4 mi||26 min||S 5||10.00 mi||Overcast||51°F||48°F||89%||1012.1 hPa|
Wind History from ACV (wind in knots)
|1 day ago||S||S||SE||NW||Calm||SW||SE||S||SW||W||NW||NW||W||W||NW||NW|
|2 days ago||Calm||Calm||SE||N||Calm||E||Calm||Calm||SW||SW||W||W||W||W||W||NW||NW||NW||Calm||Calm||SW||S||S||S |
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Trinidad Harbor |
Click for Map
Fri -- 05:49 AM PDT Sunrise
Fri -- 06:53 AM PDT -2.08 feet Low Tide
Fri -- 06:57 AM PDT Moonrise
Fri -- 01:27 PM PDT 5.87 feet High Tide
Fri -- 06:44 PM PDT 1.79 feet Low Tide
Fri -- 08:38 PM PDT Sunset
Fri -- 09:47 PM PDT Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Mad River Slough |
Click for Map
Fri -- 12:51 AM PDT 8.93 feet High Tide
Fri -- 05:50 AM PDT Sunrise
Fri -- 06:58 AM PDT Moonrise
Fri -- 07:33 AM PDT -2.15 feet Low Tide
Fri -- 02:21 PM PDT 6.63 feet High Tide
Fri -- 07:22 PM PDT 2.03 feet Low Tide
Fri -- 08:37 PM PDT Sunset
Fri -- 09:47 PM PDT Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Weather Map and Satellite Images(on/off)  Help
|Weather Map ||IR Satellite Image from GEOS|
GOES Local Image of CentralWestCoast EDIT
Wind Forecast for Eureka, CA (3,6,7,8)(on/off)  Help
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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 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.