Thursday, March23, 2017 L-36.com


Marine Weather and Tides
Trinidad, CA

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 7:10AMSunset 7:34PM Thursday March 23, 2017 7:15 PM PDT (02:15 UTC) Moonrise 3:40AMMoonset 2:01PM Illumination 13% Phase: Waning Crescent; Moon at 26 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- 204 Pm Pdt Thu Mar 23 2017
.gale warning in effect through late tonight...
Tonight..S winds 20 to 30 kt with gusts to around 40 kt. Waves sw 10 ft at 10 seconds...and W 3 ft at 14 seconds. Rain.
Fri..S winds 5 to 15 kt. Waves sw 9 ft at 10 seconds. Slight chance of Thunderstorms.
Fri night..SW winds 5 to 10 kt. Waves W 7 ft at 12 seconds. Slight chance of Thunderstorms.
Sat..W winds up to 5 kt. Waves W 9 ft at 13 seconds.
Sat night..SW winds 5 kt. Waves W 9 ft at 13 seconds.
Sun..S winds 10 to 20 kt. Waves sw 7 ft at 9 seconds...and W 7 ft at 15 seconds.
Mon..NW winds 5 to 15 kt. Waves W 13 ft at 10 seconds...and W 8 ft at 19 seconds.
Tue..NW winds 10 to 20 kt. Waves W 12 ft at 14 seconds.
PZZ400 204 Pm Pdt Thu Mar 23 2017
Synopsis for northern california waters..An approaching front will bring southerly gales to the coastal waters through tonight. Isolated storm force gusts will be possible across the northern outer waters. Winds will decrease behind the front on Friday and turn northerly on Saturday. Expect large wind driven waves to accompany the gales and decaying westerly swells over the weekend.

7 Day Forecast for Marine Location Near Trinidad, CA
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location: 41.06, -124.14     debug


Area Discussion for - Eureka, CA
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Fxus66 keka 232251
afdeka
area forecast discussion
national weather service eureka ca
351 pm pdt Thu mar 23 2017

Synopsis Moderate to heavy rain and gusty winds can be expected
tonight and tomorrow, with pleasant conditions Saturday. Another
storm system will bring more rain and gusty wind Sunday and Monday
as well.

Discussion After a mild and pleasant first half of the day,
active weather is knocking on the door as a potent spring cold
front approaches the region. Satellite imagery reveals a visually
impressive occluded low pressure system well off the washington
coast, with a sweeping cold front draped just offshore along the
pacific northwest coast before turning westward well out into the
central pacific. This cold front is steadily approaching the
region, and a leading stratiform rain shield is currently just
offshore from northwest ca. This rain shield will steadily march
through the area between this evening and early tomorrow
afternoon, bringing moderate to heavy rain to much of the area.

This rain will likely not result in any main stem river flooding,
but the expected 1 to 3" totals will likely result in some minor
nuisance flooding and will increase the potential for mudslides.

Stratiform rain will cease quickly from NW to SE as the cold front
passes through the area tomorrow morning and early afternoon, and
after a brief break, waves of showers with perhaps a strike of
lightning or two will move through mainly del norte and humboldt
counties Friday afternoon through Saturday morning.

The bigger story may actually be the expected strong southerly
winds, which will steadily increase through the evening and peak
overnight tonight. The strongest wind gusts are expected to occur
in the exposed high elevations of humboldt and del norte counties,
near point saint george and crescent city, and in SW humboldt
county near the lost coast and king range... With gusts to 55 mph
possible. Gusty winds will also be possible in most other areas,
particularly along the mendocino coast headlands and other exposed
high elevations across the interior. Wind speeds will decrease
sharply tomorrow morning as the cold front passes through the
area.

Lastly... Snow levels will be generally high with this system and
actually rising in most areas through the night due to warm air
advection aloft. However, one exception will likely occur across
the trinity horn due to a combination of evaporative and upslope
cooling, bringing snow levels down to around 3000 to 4000 feet in
the vicinity of trinity lake and the adjacent highway 3 corridor.

While there is a considerable amount of uncertainty as to whether
temperatures can cool enough between now and then to bring
accumulating snow all the way down to highway 3, with the
exception of scott mountain pass, this effect is frequently
observed in this region, and model guidance does carry this
signal. Opted not to hoist any winter weather advisories given
the high uncertainty, small geographic region, and limited
impacts of expected snow. However, motorists should be prepared to
encounter some light slushy snow along highway 3 north of
weaverville overnight tonight and tomorrow morning.

Conditions will improve markedly Saturday as a transient upper
level ridge builds overhead, but this will be brief. Another
potent storm system will bring a round of moderate to briefly
heavy rain, gusty south winds, and high elevation snow Sunday and
Monday, with similar impacts if slightly lower rain accumulations.

Stay tuned for more details regarding this storm system in the
coming days.

Another transient ridge will result in pleasant conditions again
Tuesday, followed by a weaker storm system and perhaps some
modest rain Wednesday and Thursday. /brc

Aviation Increasing clouds and winds across all terminals this
afternoon. Do have wind shear mention for late this afternoon
through the overnight hours for all terminals. Low level wind shear
up to 50 kt for crescent city and arcata airports. Wind shear to 35
kt for ukiah airport. Rain will also be moving into the area
starting late this afternoon. The heaviest rain will be during the
overnight hours into tomorrow daytime. With conditions lowering to
MVFR. Winds will diminish by early tomorrow morning. /rcl

Marine Active weather pattern will continue through this weekend.

Southerly gales through tonight, another period of strong
southerlies on Sunday.

This afternoon, a strong weather front is approaching the coast of
nw california. Southerly winds have been increasing ahead of the
front. Do expect sustained south winds to 35 kt with gusts to 45 kt.

Strongest winds will be over the northern outside waters. Thus, gale
warning is in effect for most of the coastal waters except for the
southern inside waters. The gale warning will be through most of
tonight. Winds will subside to below gale force level by late
tonight. Winds will be lighter and from the southwest on Friday.

Winds will remain light and from the west on Saturday. By Saturday
night, winds will shift back to the south and increase as another
weather front approaches the coast. Do expect stronger winds to
return to the area on Sunday.

With the increase in winds, the seas will be elevated through
tonight. Have combined seas to 14 ft for tonight. Waves will
subside to around 9 ft tomorrow as the wind wave subsides while
the westerly swell remains. Seas will remain at 9 to 10 ft through
Saturday, before increasing due to wind waves on Sunday.

Changes to the previous forecast package are fairly minor. Used
ecmwf/gfs in refreshing the forecast package.

Eka watches/warnings/advisories
Ca... Wind advisory until 5 am pdt Friday for caz101-102-104>106.

Northwest california coastal waters... Gale warning until 3 am pdt Friday for pzz450-470-475.

Small craft advisory until 3 pm pdt Friday for pzz455.

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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 mi54 min 53°F8 ft
HBYC1 - 9418767 - North Spit, CA 21 mi45 min SSE 16 G 20 50°F 54°F1018.7 hPa
46022 - EEL RIVER - 17NM West-Southwest of Eureka, CA 31 mi85 min SSE 27 G 33 50°F 53°F8 ft1017.7 hPa (-0.7)44°F
CECC1 - 9419750 - Crescent City, CA 47 mi45 min SSE 23 G 27 49°F 54°F1016.7 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, CA5 mi22 minSSE 11 G 195.00 miRain Fog/Mist48°F45°F89%1019.1 hPa

Wind History from ACV (wind in knots)
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Last 24hrN10N4NE4CalmE3E3CalmCalmCalmE5E3E3E6SE6SE7S6S7S5SW11SW14
G21
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1 day agoSE9SE8S10SW6S10S7SW9S4S6W8SW7SW6SW6SE5SE4SE4W8SW6SW5W6NW8NW10NW10NW9
2 days agoS11S9E12SE13
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Tide / Current Tables for Trinidad Harbor, California
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Trinidad Harbor
Click for Map
Thu -- 02:49 AM PDT     3.07 feet Low Tide
Thu -- 04:39 AM PDT     Moonrise
Thu -- 07:14 AM PDT     Sunrise
Thu -- 08:38 AM PDT     5.67 feet High Tide
Thu -- 03:01 PM PDT     Moonset
Thu -- 03:38 PM PDT     0.52 feet Low Tide
Thu -- 07:32 PM PDT     Sunset
Thu -- 10:17 PM PDT     5.18 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.13.53.23.13.33.84.55.15.65.65.24.43.32.21.20.60.611.9344.85.25.1

Tide / Current Tables for Mad River Slough, Arcata Bay, Humboldt Bay, California
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Mad River Slough
Click for Map
Thu -- 03:21 AM PDT     3.34 feet Low Tide
Thu -- 04:38 AM PDT     Moonrise
Thu -- 07:14 AM PDT     Sunrise
Thu -- 09:25 AM PDT     6.68 feet High Tide
Thu -- 03:02 PM PDT     Moonset
Thu -- 04:12 PM PDT     0.54 feet Low Tide
Thu -- 07:32 PM PDT     Sunset
Thu -- 11:03 PM PDT     5.86 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
54.43.83.43.43.94.75.56.26.66.65.94.83.52.110.50.71.52.53.74.85.65.9

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of CentralWestCoast    EDIT
Geos

Wind Forecast for Eureka, CA (22,6,7,8)
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Ground Weather Radar Station Eureka, CA
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weather_mapweather_map weather_map

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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.