Thursday, August17, 2017 L-36.com


Marine Weather and Tides
Weaverville, 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 6:21AMSunset 8:06PM Wednesday August 16, 2017 10:51 PM PDT (05:51 UTC) Moonrise 12:10AMMoonset 2:50PM Illumination 26% Phase: Waning Crescent; Moon at 25 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 820 Pm Pdt Wed Aug 16 2017
Synopsis for northern california waters..Strong to gale force winds will persist across the outer waters for the next several days as a thermal trough intensifies over interior california. Very steep seas will build in response to the winds and will persist through the weekend.

7 Day Forecast for Marine Location Near Weaverville, CA
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location: 40.78, -122.83     debug


Area Discussion for - Eureka, CA
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Fxus66 keka 162241
afdeka
area forecast discussion
national weather service eureka ca
341 pm pdt Wed aug 16 2017

Synopsis High pressure building over the west coast will bring
warming to the interior for the rest of the week. An upper level
trough will knock down temperatures slighlty this weekend.

Discussion Pics from space today showing a pronounced smoke
signature from fires near happy camp and orleans. Due to the
northeast flow the smoke is making a bee line from northeast to
southwest promoting very hazy and somewhat obscured skies over
the north coast and humboldt bay. The current ridge of high
pressure will nose over the area on Thursday and high
temperatures across the interior valleys will warm another 5-10f.

The heat risk will be moderate across central and eastern trinity
county as well as northeastern mendocino county where high
temperatures are expected to peak around 100-105f. Folks are
encouraged to take necessary precautions to avoid heat related
issues... And stay as hydrated as possible. The north coast should
see warming also as an offshore wind flow pattern suppresses the
marine layer and limits the extent and duration of stratus and
fog. Lower 70's for eureka seems unlikely with a distinct onshore
component in the afternoon... But given the squashing of the marine
layer (2000' tues to < 1000' today) late morning clearing at the
coast is likely over the next few days. The mendocino coast on
the other extreme will continue to be socked in due to a stronger
southerly push of the low clouds up against the terrain. Marine
air may trickle into the anderson valley and perhaps into the
russian river valley reducing the potential for 100f heat. It is
not clear that stratus will round the CAPE Thu or fri. Diurnal
local stratus will still form north of the cape, especially around
humboldt bay and in the delta... But again..May clear earlier in
the day than what was seen earlier this week. The warming trend
will level off or reverse this weekend as an upper level trough
approaches the northwest california coast. The trough will weaken
and split with a cut-off low forming nearby the forecast area by
late in the weekend. We may be in store for another round of
interior showers and thunderstorms early next week. The latest gfs
continues to indicate wrap around moisture as well as instability
on Tuesday. The threat for interior showers and wet storms may
continue into wed. However confidence still fairly low on this
potential.

Aviation Marine stratus, MVFR-lifr continued along the north coast
today although clouds did not appear to be as expansive. This was
especially so at cec this morning where clouds advected out of
the area early. Elsewhere clouds were slower to mix out and
continued to hug the immediate coast through afternoon... And
stayed offshore. At cec, north winds ramped up around noon helping
to keep clouds well south of the area. Therefore, cec may remain
mostly clear overnight. Model guidance is somewhat "iffy" at this
time (mid-afternoon). Along the humboldt coast, the extent of the
low clouds were thinned out shortly after noonday, but may see
clouds push back into acv by this evening. The mendocino coastline
will remain saturated with stratus clouds. Inland areas will
remainVFR through the TAF period. Ta

Marine Strong to gale force north winds will persist through the weekend in
the outer waters as a thermal trough strengthens over interior
california and surface high pressure builds over the eastern
pacific. The strong winds will result in very steep and high seas,
particularly in the northern outer waters and northwestern portion
of the southern outer waters. Winds and seas will be lower in the
inner waters zones but some of the steeper seas could propagate into
the western half of the near coastal zones. Have opted to not expand
or lengthen the small craft in the northern waters zone as there is
very high uncertainty as to how the pressure gradient will set up
and where the steepest seas will be situated in relation to the two
near shore zones. Rpa

Fire weather Weak offshore flow will return tonight and early
Thursday and magnitude of wind looks very similar to last night's.

Have continued to headline the klamath trinity zones to reflect
the gustiness and accompanying localized lower recoveries. The
ridge of high pressure which is contributing to the offshore flow
will continue to gain momentum and gradually move east over the
region. This will reduce the offshore flow but allow interior
temperatures to warm and lowering corresponding daytime rh's. The
ridge will gradually shift over the area on Thu through Fri and
high temperatures will likely peak around 100-105f in the hottest
interior valleys. Min rh's will bottom out around 10-25% each day
for the next several days... And perhaps some single digit rhs over
the usual spots like somes bar and big bar. By Friday the upper
level ridge begins to flatten and the airmass becomes a bit more
troughy allowing temperatures to fall back to near normal for this
weekend. This trough may also generate a few mountain
showers... With the first day decent instability being Friday. The
focus of attention on Friday looks to occur over extreme east
side of the CWA around the alps and yolla bolla spine. Next week
is looking much more interesting for storms. The GFS continues to
show a cut- off low forming off the coast early next week. The
track and evolution of the upper low are still very uncertain as
the GFS changes around ever so slightly from one run to the next.

The GFS does indicate wrap around moisture and southeasterly flow
on Tuesday and Wednesday for wet storms at this time. For now will
indicate only a slight chance for Tuesday based on the last
several runs of the gfs... With confidence improving once (if) the
ecmwf comes around.

Tonkin

Eka watches warnings advisories
Ca... None.

Northwest california coastal waters... Small craft advisory until 5 am pdt Thursday for pzz410-450.

Gale warning until 9 pm pdt Sunday for pzz470.

Small craft advisory until 9 pm pdt Sunday for pzz475.

Hazardous seas warning from 7 pm this evening to 9 am pdt
Thursday 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 74 mi76 min SSW 9.9 G 9.9 58°F 53°F1015 hPa
46244 - Humboldt Bay, North Spit, CA 81 mi61 min 58°F10 ft

Wind History for North Spit, Humboldt Bay, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure

Wind History from O54 (wind in knots)
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Last 24hrW6W7SW9S5SW5S5SW7CalmNE3NE3NE3N4CalmCalmCalmW3SW5SW7
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Tide / Current Tables for Arcata Wharf, Humboldt Bay, California
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Arcata Wharf
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Thu -- 02:06 AM PDT     Moonrise
Thu -- 03:33 AM PDT     0.18 feet Low Tide
Thu -- 06:28 AM PDT     Sunrise
Thu -- 10:06 AM PDT     5.12 feet High Tide
Thu -- 03:10 PM PDT     2.91 feet Low Tide
Thu -- 04:59 PM PDT     Moonset
Thu -- 08:11 PM PDT     Sunset
Thu -- 09:24 PM PDT     7.50 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.82.310.30.30.81.82.944.85.14.94.53.83.22.93.13.84.966.97.47.46.6

Tide / Current Tables for Mad River Slough, Arcata Bay, Humboldt Bay, California
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Mad River Slough
Click for Map
Thu -- 02:06 AM PDT     Moonrise
Thu -- 03:14 AM PDT     0.09 feet Low Tide
Thu -- 06:28 AM PDT     Sunrise
Thu -- 10:01 AM PDT     5.62 feet High Tide
Thu -- 02:51 PM PDT     3.00 feet Low Tide
Thu -- 04:59 PM PDT     Moonset
Thu -- 08:11 PM PDT     Sunset
Thu -- 09:19 PM PDT     8.29 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.720.70.10.31.12.23.44.55.35.65.44.73.93.233.44.35.56.77.78.38.17.2

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 (1,6,7,8)
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Ground Weather Radar Station Medford, OR
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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.