Saturday, April21, 2018 L-36.com


Marine Weather and Tides
Westhaven-Moonstone, CA

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.

Sunrise 6:25AMSunset 8:04PM Saturday April 21, 2018 2:50 AM PDT (09:50 UTC) Moonrise 10:13AMMoonset 12:19AM Illumination 35% Phase: Waxing Crescent; Moon at 6 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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PZZ450 Pt St George To Cape Mendocino Out 10 Nm- 853 Pm Pdt Fri Apr 20 2018
.small craft advisory in effect from Saturday morning through Sunday evening...
Tonight..N winds 5 to 15 kt. Waves nw 4 ft at 6 seconds...and nw building to 7 ft at 15 seconds.
Sat..N winds 10 to 15 kt...rising to 15 to 25 kt. Waves nw 6 ft at 7 seconds...and nw 7 ft at 15 seconds.
Sat night..N winds 15 to 25 kt with gusts to around 35 kt. Waves nw 9 ft at 9 seconds...and nw 7 ft at 15 seconds.
Sun..N winds 10 to 20 kt. Waves nw 8 ft at 9 seconds...and nw 5 ft at 14 seconds.
Sun night..N winds 10 to 20 kt. Waves nw 10 ft at 10 seconds.
Mon..NW winds 5 to 10 kt. Waves N 6 ft at 7 seconds...and nw 5 ft at 15 seconds.
Tue..NW winds 5 kt. Waves nw 4 ft at 5 seconds...and W 8 ft at 16 seconds.
Wed..SW winds 5 kt. Waves N 3 ft at 5 seconds...and W 6 ft at 14 seconds.
PZZ400 853 Pm Pdt Fri Apr 20 2018
Synopsis for northern california waters..Northerly winds will continue through the weekend, increasing to gale force across the outer waters by Saturday evening, which will result in large, steep wind waves building. Closer to shore, within 10 nm, some near gale force gusts will be possible around cape mendocino and pt st george. The strong winds and large seas are forecast to persist through Sunday evening.

7 Day Forecast for Marine Location Near Westhaven-Moonstone, CA
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location: 41.05, -124.1     debug


Area Discussion for - Eureka, CA
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Fxus66 keka 202101
afdeka
area forecast discussion
national weather service eureka ca
201 pm pdt Fri apr 20 2018

Synopsis Above normal high temperatures are expected for the
interior this weekend. Occasional stratus and breezy afternoon
winds will keep temperatures near normal for coastal areas. Mainly
dry weather is expected to continue through most of next week.

Discussion Stratus has been slowing increasing along the
shoreline today. The stratus will expand over the coastal plain
this evening and spread into the coastal river valleys through the
night. Daytime heating and mixing on Saturday will scour out the
low clouds and expect bright sunshine with brisk northerly winds
for the afternoon hours.

Inland high temperatures were several degrees warmer today.

The warming trend will continue on Saturday, with highs
expected to reach the mid 70s to lower 80s. A shortwave trough
will move over the area on Sunday and interior temperatures will
either level off or cool slighlty. Breezy northerlies on Sunday
may result in greater cooling for the coastal river valleys.

Patchy frost will be possible late tonight and again late
Saturday night in trinity county. The coverage will be limited to
the most wind protected valleys. For now will hold off on
hoisting a frost advisory. The duration of temperatures at or
below 36f should mitigate the severity of the frost which has
occurred for the last couple of nights.

High pressure will continue to dominate on Monday and Tuesday.

Continued dry conditions with above normal high temperatures will
persist for inland areas. The coast may see highs in the 60s on
Monday with mainly clear skies due to an offshore flow. On Tuesday,
the ridge axis will buckle and move east increasing the potential
for longer duration coastal stratus.

Wednesday through Friday, an upper level trough low will approach
130w south of 35n on Wednesday and then meander about offshore
during the latter portion of the week. The models were in general
agreement, but continued to diverge with minor precip generation.

The consensus is for cooling in the interior and an increase in
coastal stratus mid to late next week. There does appear to be a
slight chance for showers and isolated convection, especially for
the interior mountains with daytime heating. The potential for
showers may increase on Friday as the offshore low starts to
eject northeastward toward NW california. Confidence in this
scenario is not high due to the tendency for the models to be too
fast with ejecting cut-off lows. Overall, it is not a pattern that
would result in prolonged wet weather for NW california. There is
a potential for some showers and convection, however.

Aviation Generally benign weather continued across the region
today under a dome of high pressure. A blanket of marine clouds
hovered over the eel delta this morning with stratus shreds
lurking along sections of the redwood coast. This morning's taf
added tempo after 1 pm at acv for stratus. Shortly after 1 pm, acv
reported bkn008. The concern at acv and cec will be the
reintroduction of marine stratus late night and morning. At this
time, mixed confidence if stratus will be widespread in the
morning. A front, associated with an upper level trough, will
brush the northern periphery of del norte. The tail end will
remain mostly dry, therefore keeping rain chances north of the
region. However, increasing mid-high clouds associated with this
system will trek across north coast. Ta

Marine Northerly winds will increase over the waters tomorrow
with gales expected over the outer waters as a thermal trough
strengthens over the mainland. Near shore, strong winds are forecast
with the possibility of some gale force gusts near the 10 nm
line. In addition to these winds, large and steep wind waves will
build in response. The combination of the wind driven waves and a
nw swell will lead to 12 to 14 ft seas beyond 10nm and 8 to 11 ft
seas within 10nm. The gale watch remains in effect for the outer
waters and small craft advisories have been hoisted for the inner
waters. Sec kr

Eka watches warnings advisories
Ca... None.

Northwest california coastal waters...

small craft advisory from 11 am Saturday to 9 pm pdt Sunday for
pzz450. Gale watch from Saturday afternoon through Sunday
evening for pzz470-475. Small craft advisory from 8 am Saturday
to 9 pm pdt Sunday for pzz455. Small craft advisory until 3 pm
pdt Saturday for pzz475.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46244 - Humboldt Bay, North Spit, CA 17 mi50 min 53°F8 ft
HBYC1 - 9418767 - North Spit, CA 21 mi74 min NNE 8 G 9.9 50°F 53°F1027.6 hPa
46022 - EEL RIVER - 17NM West-Southwest of Eureka, CA 32 mi60 min N 14 G 16 52°F 52°F6 ft1026.6 hPa (+0.0)47°F
CECC1 - 9419750 - Crescent City, CA 48 mi56 min N 1.9 G 2.9 44°F 52°F1027.2 hPa

Wind History for North Spit, Humboldt Bay, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Arcata / Eureka, Arcata Airport, CA4 mi57 minN 010.00 miFair45°F41°F86%1027.5 hPa

Wind History from ACV (wind in knots)
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Last 24hrE4E5E5E6E5CalmNE3W6W8NW7W8NW12NW16NW16NW16NW14NW14
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1 day agoE3E3E5E5E5CalmCalmNW5NW8NW14NW13NW15NW18NW17
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2 days agoE3CalmE3CalmCalmNE3CalmCalmW56W7NW9NW10NW11NW12NW12N11N8N6NE3CalmE3E3Calm

Tide / Current Tables for Trinidad Harbor, California
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Trinidad Harbor
Click for Map
Sat -- 01:19 AM PDT     Moonset
Sat -- 03:43 AM PDT     6.44 feet High Tide
Sat -- 06:28 AM PDT     Sunrise
Sat -- 10:55 AM PDT     -0.67 feet Low Tide
Sat -- 11:13 AM PDT     Moonrise
Sat -- 05:48 PM PDT     5.03 feet High Tide
Sat -- 08:03 PM PDT     Sunset
Sat -- 10:54 PM PDT     2.85 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.74.75.66.36.45.94.93.41.90.5-0.4-0.7-0.30.61.93.24.24.954.74.13.532.9

Tide / Current Tables for Mad River Slough, Arcata Bay, Humboldt Bay, California
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Mad River Slough
Click for Map
Sat -- 01:18 AM PDT     Moonset
Sat -- 04:38 AM PDT     7.57 feet High Tide
Sat -- 06:28 AM PDT     Sunrise
Sat -- 11:14 AM PDT     Moonrise
Sat -- 11:35 AM PDT     -0.71 feet Low Tide
Sat -- 06:41 PM PDT     5.74 feet High Tide
Sat -- 08:02 PM PDT     Sunset
Sat -- 11:31 PM PDT     3.14 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.64.75.96.97.57.56.95.63.81.90.4-0.5-0.601.22.63.94.95.65.75.34.53.73.2

Weather Map and Satellite Images
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GOES Local Image of CentralWestCoast    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.
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Wind Forecast for Eureka, CA (5,6,7,8)
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Ground Weather Radar Station Eureka, CA
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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.