Friday, January19, 2018 L-36.com


Marine Weather and Tides
Big Lagoon, CA

Version 3.4
What's New / NOTES
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.
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 7:35AMSunset 5:19PM Thursday January 18, 2018 9:51 PM PST (05:51 UTC) Moonrise 8:38AMMoonset 7:04PM Illumination 6% Phase: Waxing Crescent; Moon at 2 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- 855 Pm Pst Thu Jan 18 2018
.hazardous seas warning in effect through Saturday morning...
Tonight..SW winds 10 kt. Waves sw 3 ft at 5 seconds...and W 18 ft at 15 seconds. Widespread showers and slight chance of Thunderstorms.
Fri..SW winds 5 to 10 kt. Waves sw 3 ft at 5 seconds...and W 16 ft at 15 seconds. Scattered showers and slight chance of Thunderstorms.
Fri night..W winds 5 kt. Waves sw 2 ft at 5 seconds...and W 15 ft at 14 seconds. Chance of showers.
Sat..N winds 5 kt. Waves W 2 ft at 5 seconds...and W 13 ft at 13 seconds.
Sat night..S winds 5 to 15 kt. Waves W 10 ft at 12 seconds.
Sun..S winds 15 to 25 kt. Waves sw 6 ft at 7 seconds...and W 14 ft at 16 seconds.
Mon..NE winds 5 kt. Waves sw 3 ft at 7 seconds...and W 12 ft at 14 seconds.
Tue..S winds 10 to 15 kt. Waves S 5 ft at 7 seconds...and W 8 ft at 12 seconds.
PZZ400 855 Pm Pst Thu Jan 18 2018
Synopsis for northern california waters..A a long period 18 to 22 ft westerly swell will continue across the waters through tonight. Seas will very gradually decrease through Saturday. Another round of strong southerly winds and a reinforcing westerly swell will combine to create very large seas on Sunday.

7 Day Forecast for Marine Location Near Big Lagoon, CA
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location: 41.17, -124.32     debug


Area Discussion for - Eureka, CA
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Fxus66 keka 182258
afdeka
area forecast discussion
national weather service eureka ca
258 pm pst Thu jan 18 2018

Synopsis Showers will persist across the region through Friday.

These showers combined with cold air aloft will yield mountain
snow and possibly coastal hail. A brief period of drier weather
is expected to occur during Saturday, followed by another round of
rain on Sunday.

Discussion Showers and a few thunderstorms are moving onshore
this afternoon. Snow levels are currently around 4,000 feet.

These are expected to become more vigorous tonight when the colder
air aloft moves overhead tonight in Friday morning. Instability
is not very impressive, but mid level lapse rates are over 8c km
and h500 mb temps are around -34c north of CAPE mendocino. This
should bring fairly widespread small hail starting this evening.

This is starting in crescent city first and spreading south
through the night and into Friday morning. Snow levels tonight are
expected to drop to around 2,000 to 2,500 feet tonight. Snow
accumulations of 3 to 6 inches are possible above 3,000 feet.

Locally higher amounts possible in the heavier showers.

Friday afternoon showers will diminish, especially over the inland
areas. They may linger a bit longer than currently expected as
the flow remains onshore. Saturday any lingering showers should
taper off as a brief period of high pressure builds into the
region. This is fairly weak so skies may not clear out very much.

Sunday the next cold front moves into the region. Models are
struggling with the strength of this system. The 12z GFS pushes the
main energy farther south and keeps area north of CAPE mendocino
much drier. The 12z ECMWF is similar to previous runs and much
wetter. Both models show the potential for low elevation snow in
trinity with higher levels closer to the coast. The cold air in
place from Saturday night combined with some upslope flow on
Sunday may keep them around 2,000 or 2,500 feet for this event.

Monday showers look to end quickly as both models push the systems
out of the area. Tuesday the next system is expected to bring rain
and snow to the area. Some of the models are showing an extended
period of wet weather as the boundary stalls over us on Tuesday
through early Wednesday. Late Wednesday the upper level trough
moves over the area and snow levels will fall as the cold air
moves in and showers prevail. Mkk

Aviation Rain and convective post frontal weather disturbances
(shortwaves) will continue to rotate into nwrn california through
Friday as the associated upper level trough swings over the
region. By late Friday afternoon, shower activity should start
tapering. The cec, acv and uki air terminals can expect
fluctuatingVFR-ifr conditions through the period... And especially
through this evening. Acv and cec terminals can particularly
expect multiple flight hazards including:
lower CIGS vis, mod-heavy shra, occasional tsrags (small hail),
lightning and convective wind gust.

Marine The very large westerly swell peaked around 4am this
morning with most buoys reporting significant wave heights of 28
feet around 18 seconds. This afternoon the swell is still being
measured at 19-24 feet around 17 seconds at our coastal buoys.

This swell will continue to very gradually decay over the next few
days. Southerly winds have also continued to decrease this
afternoon. This very large swell has also created very hazardous
conditions for traversing the humboldt bay entrance. Due to these
hazardous conditions the uscg has closed the entrances to
humboldt bay, as well as crescent city and noyo harbors at 1pm.

These entrances will remain closed until conditions improve. Winds
are still southerly at most locations however, they should begin
to turn more westerly and eventually northwesterly as we go
through the evening and Friday.

Sunday, winds and seas will yet again increase as another system
passes off to our north. Near gale to gale force winds will be
possible by Sunday morning and persist through early Monday morning.

These strong winds will also cause short period waves to increase on
Sunday. In addition to the short period waves, another large
westerly swell will begin to build across the waters beginning
Sunday morning. Conditions will gradually improve on Monday however
the sea state will remain elevated through early next week. Wci

High surf A significant westerly swell is currently impacting
our area and will gradually begin to diminish late tonight through
tomorrow. Buoys just offshore today have been reporting waves of
22 to 28 feet which have resulted in high surf conditions along
all west and northwest facing beaches. A high surf warning remains
in effect through 10 pm this evening. Wci

Eka watches warnings advisories
Ca... High surf warning until 10 pm pst this evening for caz101-103-
104-109.

Winter weather advisory from 7 pm this evening to 7 pm pst
Friday for caz105>108.

Winter weather advisory until 7 pm pst Friday for caz102.

Northwest california coastal waters...

ca... High surf warning until 10 pm pst this evening for caz101-103-
104-109.

Winter weather advisory from 7 pm this evening to 7 pm pst
Friday for caz105>108.

Winter weather advisory until 7 pm pst Friday for caz102.

Northwest california coastal waters...

hazardous seas warning until 10 am pst Saturday
for pzz450-455-470-475.

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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 19 mi51 min 54°F19 ft
HBYC1 - 9418767 - North Spit, CA 28 mi75 min S 8.9 G 16 47°F 53°F1016 hPa
46022 - EEL RIVER - 17NM West-Southwest of Eureka, CA 33 mi61 min WSW 16 G 19 53°F 53°F21 ft1014.7 hPa (-0.0)42°F
CECC1 - 9419750 - Crescent City, CA 40 mi51 min SSE 6 G 14 47°F 52°F1013.9 hPa (+0.4)
46027 - ST GEORGES - 8NM West Northwest of Crescent City, CA 47 mi61 min SW 12 G 18 51°F 54°F18 ft1013.3 hPa (+0.0)

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, CA17 mi58 minSSE 710.00 miLight Rain50°F44°F80%1015.8 hPa

Wind History from ACV (wind in knots)
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SW11S11S12S8S8SE6SE10SE7SE5SE6SE6S8S63SW12SE6SE9S10SE7S7SE5SE7
1 day agoE6SE3CalmE5E5E5E3E4E5E5E5SE6SE3SE8SE11
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2 days agoSE4E4E5CalmE3E5E3E3SE3E5E4SE3CalmCalmS3W5CalmCalmCalmCalmCalmE3CalmCalm

Tide / Current Tables for Trinidad Harbor, California
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Trinidad Harbor
Click for Map
Fri -- 01:31 AM PST     6.00 feet High Tide
Fri -- 06:44 AM PST     3.18 feet Low Tide
Fri -- 07:37 AM PST     Sunrise
Fri -- 09:11 AM PST     Moonrise
Fri -- 12:27 PM PST     6.84 feet High Tide
Fri -- 05:17 PM PST     Sunset
Fri -- 07:22 PM PST     -0.01 feet Low Tide
Fri -- 08:02 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.35.95.95.44.73.93.33.23.64.45.36.26.86.76.14.93.41.80.600.10.92.13.6

Tide / Current Tables for Mad River Slough, Arcata Bay, Humboldt Bay, California
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Mad River Slough
Click for Map
Fri -- 02:23 AM PST     6.65 feet High Tide
Fri -- 07:21 AM PST     3.38 feet Low Tide
Fri -- 07:36 AM PST     Sunrise
Fri -- 09:11 AM PST     Moonrise
Fri -- 01:18 PM PST     7.87 feet High Tide
Fri -- 05:18 PM PST     Sunset
Fri -- 08:01 PM PST     -0.19 feet Low Tide
Fri -- 08:02 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.966.66.55.84.943.43.54.25.36.57.47.87.76.85.23.31.60.3-0.20.21.32.8

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 (0,6,7,8)
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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.