Monday, August21, 2017 L-36.com


Marine Weather and Tides
Eureka, 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 6:32AMSunset 8:06PM Monday August 21, 2017 10:59 AM PDT (17:59 UTC) Moonrise 5:24AMMoonset 7:17PM Illumination 0% Phase: New Moon; Moon at 29 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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This is a Weather Statement Zone, please check the Date to see if it has expired
PZZ410 750 am pdt Thu aug 10 2017 a marine weather statement has been issued for the following areas... Waters from pt. St. George to cape mendocino ca out 60 nm... Humboldt bay bar... At 749 am pdt...doppler radar indicated a strong Thunderstorm... Capable of producing winds to around 30 knots. This Thunderstorm was located 16 nm west of eureka...moving southeast at 10 knots. Precautionary/preparedness actions... Mariners can expect gusty winds to around 30 knots...locally higher waves...and lightning strikes. Boaters should seek safe harbor immediately until this storm passes. && lat...lon 4082 12415 4082 12417 4085 12417 4076 12423 4081 12417 4069 12425 4071 12427 4069 12428 4063 12429 4063 12432 4050 12439 4087 12483 4108 12440 4093 12414 4085 12416 4087 12415 4086 12412
PZZ400 810 Am Pdt Mon Aug 21 2017
Synopsis for northern california waters..SEas will be hazardous through this morning...especially for northern outside waters. However, seas will gradually subside later today. Moderate north winds will be in store for Tuesday. Conditions will deterioate yet again starting on Wednesday.

7 Day Forecast for Marine Location Near Eureka, CA
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location: 40.81, -124.14     debug


Area Discussion for - Eureka, CA
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Fxus66 keka 211106
afdeka
area forecast discussion
national weather service eureka ca
406 am pdt Mon aug 21 2017

Synopsis Northeasterly winds will continue to transport smoke
across the redwood coast this morning with winds starting to push
it more to the north this afternoon. Thunderstorms will be
possible over portions of trinity and northeastern mendocino
counties during the afternoon and evening hours of Monday through
Wednesday with the best chances Tuesday.

Discussion An upper level low over southern ca is starting to
drift north and change our weather pattern. This is pushing the
high pressure off to the west. In turn, this has allowed
southerly winds to push the stratus up north of CAPE mendocino
this morning. As of 4am it has nearly made it to crescent city.

In humboldt county southeast winds are keeping the stratus
confined to only the immediate coastal areas and up the mattole
valley. Confidence is low that the immediate coast will see much
clearing this morning, but only 5 to 10 miles inland will likely
see clearing skies. Currently del norte county continues to see
only smoke, but stratus may push in there this morning as well.

Again it will likely remain clear just a few miles inland. Along
the mendocino coast there is widespread stratus. It will likely
clear back towards the coast this morning, but the immediate coast
will likely remain cloudy through the day. This upper level low
will also start shift the winds aloft to a more southerly
direction which will start to push the smoke off to the north of
the area from the large fires southern oregon and siskiyou county.

Confidence is low on the timing of this.

This area of low pressure will start to destabilize the interior
areas this afternoon. There is the potential for a thunderstorm or
two over the yolla bolla mountains in southern trinity and
northeastern mendocino counties. Lapse rates are decent, around
7.5 c km and total totals are in the low 50s in this area.

Tonight the stratus will likely be more widespread with light
northerly surface winds to push it up the river valleys. Stratus
is possible again in ukiah as well.

Tuesday as the low continues to approach the area thunderstorms
chances increase, mainly over trinity county and northeastern
mendocino county again. Total totals on the GFS are nearly 55
across portions of trinity county which indicates the potential
for scattered thunderstorms. There is a decent amount of moisture
with these storms so there could be some locally heavy rainfall.

Models are indicating there may be some mid and high level clouds
across the area. This could limit heating and the thunderstorm
potential, but the NAM shows a decent shortwave rotating around
the low and coming into trinity county in the late afternoon
which will help increase the potential for the storms. There are
some indications that a few storms may continue overnight, but
confidence is low on this. Have issued a fire weather watch due
to the potential for scattered thunderstorms in trinity county,
for details see the fire weather section.

Wednesday there is still a chance for a couple thunderstorms in
trinity county, but the potential is lower as drier westerly flow
moves into the area. Coastal stratus will likely be around the
morning with only partial afternoon clearing at the coast.

Thursday into the weekend high pressure builds into the area.

Inland areas will see temperatures warming back over the century
mark with the hottest day being Sunday. There will be some weak
offshore flow overnight which may help to keep stratus to a
minimum. Early next week a weak shortwave may start to cool
temperatures inland and deepen the marine layer. Mkk

Aviation Aviation forecast is more complicated today. As of early
this morning, marine stratus had made its way north and lowered the
ceiling down to 400 feet with reduced visibilities. Crescent city
was still impacted by the smoke from SW oregon. The smoke was thick
enough to lower the ceiling to around 1500 feet. By sunrise, the
marine stratus should be getting fairly close to crescent city.

Meanwhile, clear skies prevailed over ukiah. Think that smoke will
be the dominant player for crescent city for today. For arcata
airport, marine stratus should gradually burn off this morning
giving way to smoke. For both locations, do expect marine stratus to
push into the area tonight. For ukiah, clear skies will prevail
through the forecast period.

Marine Today is the day of transition from strong winds and steep
seas to improving conditions. However, for early this morning,
conditions will still be hazardous due to steep seas. CAPE mendocino
buoy still reported 12 feet of wave height at around 10 seconds
early this morning. Have hazardous seas warning for northern outside
waters this morning. The seas there is expected to subside to below
hazardous seas warning criteria during this morning. We also have a
small craft advisory for northern inside and southern outside waters
due to winds and seas. Do expect seas and winds to decrease during
the day today. There should be a brief period of relatively tranquil
conditions through Tuesday. Conditions will once again worsen
starting on Wednesday. The elevated seas and winds will then persist
through the start of the weekend.

Changes to the previous forecast package were minor. Utilized gfs
and NAM as the models of choice.

Fire weather The main fire weather concern will the be the
thunderstorms on Tuesday. Storm motion looks to be slow, around 5
to 10 mph. There will likely be moderate rain with most storms,
but there is still the potential for strikes outside the heavy
rain cores. There is also the potential for holdovers with the
warmer and drier weather late in the week. Wednesday there is a
chance for a few more thunderstorms, but they are not likely to
be as widespread. Mkk

Eka watches warnings advisories
Ca... Fire weather watch from Tuesday afternoon through Tuesday
evening for caz283.

Northwest california coastal waters...

small craft advisory until 9 am pdt this morning for pzz450.

Hazardous seas warning until 9 am pdt this morning for pzz470.

Small craft advisory until 3 pm pdt this afternoon for pzz475.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
HBYC1 - 9418767 - North Spit, CA 5 mi83 min SW 6 G 8.9 52°F 59°F1016 hPa
46244 - Humboldt Bay, North Spit, CA 13 mi38 min 52°F7 ft
46022 - EEL RIVER - 17NM West-Southwest of Eureka, CA 22 mi69 min W 9.7 G 12 52°F 53°F7 ft1015.3 hPa (+1.0)51°F
46213 - Cape Mendocino, CA (094) 47 mi37 min 53°F10 ft

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, CA13 mi66 minS 32.50 miFog/Mist54°F54°F100%1016.2 hPa
Fortuna Rohnerville Airport, CA18 mi84 minN 03.00 miOvercast52°F51°F100%1015.6 hPa

Wind History from ACV (wind in knots)
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Last 24hrW5SW6SW8SW11SW9SW10S9S8S8S7S7S5SE4SE5SE3CalmCalmSW4CalmSE4S5S3S5S3
1 day agoNW4W4W6NW6NW6NW8NW8NW8S6S8SE43SE3SE3CalmE3CalmCalmE3CalmE3CalmN3NW4
2 days agoW3NW5NW5NW4CalmNW7W63S8S6CalmSE3SE4SE5CalmE3E3CalmCalm3SE4SE53Calm

Tide / Current Tables for Eureka Slough Bridge, Humboldt Bay, California
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Eureka Slough Bridge
Click for Map
Mon -- 06:23 AM PDT     Moonrise
Mon -- 06:26 AM PDT     -1.05 feet Low Tide
Mon -- 06:32 AM PDT     Sunrise
Mon -- 11:31 AM PDT     New Moon
Mon -- 01:16 PM PDT     6.88 feet High Tide
Mon -- 06:28 PM PDT     1.70 feet Low Tide
Mon -- 08:05 PM PDT     Sunset
Mon -- 08:16 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
8.47.96.54.42.10.1-0.9-0.901.53.356.26.86.65.74.22.71.81.82.745.67

Tide / Current Tables for Fields Landing, Humboldt Bay, California
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Fields Landing
Click for Map
Mon -- 06:11 AM PDT     -1.02 feet Low Tide
Mon -- 06:24 AM PDT     Moonrise
Mon -- 06:33 AM PDT     Sunrise
Mon -- 11:31 AM PDT     New Moon
Mon -- 12:42 PM PDT     6.30 feet High Tide
Mon -- 06:13 PM PDT     1.65 feet Low Tide
Mon -- 08:05 PM PDT     Sunset
Mon -- 08:16 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
7.66.75.13.21.2-0.3-1-0.70.423.75.26.16.35.74.73.42.21.71.92.94.35.87

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 (13,3,4,5)
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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.