Friday, June22, 2018 L-36.com


Marine Weather and Tides
Weaverville, CA

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 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.

Sunrise 5:37AMSunset 8:45PM Friday June 22, 2018 7:29 PM PDT (02:29 UTC) Moonrise 2:39PMMoonset 1:31AM Illumination 72% Phase: Waxing Gibbous; Moon at 10 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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PZZ410 730 pm pdt Tue mar 13 2018 a marine weather statement has been issued for the following areas... Coastal waters from pt. St. George to cape mendocino ca out 10 nm... Humboldt bay bar... At 729 pm pdt, doppler radar indicated a shower, capable of producing winds to around 30 knots. This shower was located 9 nm north of cape mendocino, moving northeast at 20 knots. Precautionary/preparedness actions... Water spouts are possible along with stronger Thunderstorms...locally higher waves...and lightning strikes. Boaters should seek safe harbor immediately until these storms pass. 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 4080 12411 4080 12418 4075 12419 4073 12423 4070 12421 4068 12422 4070 12427 4071 12427 4065 12431 4063 12429 4063 12424 4062 12426 4063 12432 4047 12439 4057 12459 4095 12437 4086 12417 4076 12423 4085 12416 4082 12409 PZZ400 213 Pm Pdt Fri Jun 22 2018
Synopsis for northern california waters..N winds will increase through the end of the week as high pressure strengthens offshore. Gale force wind gusts will be possible across the outer waters and near cape mendocino. Persistent north winds will result in steep, building seas 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 222147
afdeka
area forecast discussion
national weather service eureka ca
247 pm pdt Fri jun 22 2018

Synopsis Temperatures will warm up across interior northern
california this weekend. Onshore breezes and marine air will keep
coastal areas cool. Dry weather with seasonable temperatures will
hold through next week.

Discussion Stratus has cleared out nicely today with only a
few patches still hovering over the hills around eureka. An
offshore flow will develop tonight and force a thermal trough out
over the coast. The northeast flow above mean sea level should
limit the regeneration of stratus especially for the mendocino
coast and the del norte county coast. Marine air pooling along
with a tighter marine inversion tonight will probably result in
low cloud regeneration around humboldt bay and in the eel delta.

With a stronger inversion, it may take longer for coastal stratus
to mix out on Saturday. Guidance continues to indicate
northwesterly breezes kicking-in during the afternoon which
should be sufficient to clear out the stratus.

The ridge axis aloft will flatten out and shift east on Sunday.

An onshore flow will start to develop as the thermal trough edges
slightly inland. This will probably bring an end to the warming
for coastal areas and adjacent river valleys. Coastal areas may
start to see more stratus and fog Sunday afternoon, though it
looks more likely Sunday night into Monday.

The main concern Saturday through Sunday will be the interior
heat, as an upper level ridge builds over the area. The strong
adiabatic compressional heating will propel daytime highs well
into the 90s with some sites reaching 100f or more on Saturday
and again on Sunday. High temperatures are expected to peak
around 105f in some of the valleys of interior mendocino county on
Saturday. A heat advisory has been hoisted for groups sensitive
to heat. Health related impacts from the heat may continue for
interior mendocino county on Sunday and spread northward into
portions of trinity county. Latest guidance continues to indicate
high temperatures falling a few degrees on Sunday for interior
mendocino county, while increasing a few degrees for trinity
county. The air aloft will be quite warm on Sunday and
temperatures may warm up quickly before westerly sea breezes
develop across the coastal river valleys.

A transient mid level trough will likely bring an end to the brief
warm up on Monday. The trough will exit Tuesday and Wednesday
and heights will increase. Temperatures will probably edge up
and remain above normal across the interior through next week.

Coastal areas will continue to see the usual dose of night and
morning low clouds.

Aviation The north coast experienced another morning of marine
stratus. CIGS dropped to lifr ifr while vis generally remained
vfr. Several early acv pireps measured bases about 400 feet and
tops 1600-1800 feet. Conditions were more compressed at cec with
tops averaging 1000 feet. CIGS basically scattered shortly before
noon, with pockets of stratus continuing to lurch near the eel
delta-humboldt bay and near the klamath delta. Uki and other
interior locations wereVFR and will continue so into Saturday.

Model data is somewhat of a "mixed bag" on coastal stratus
development overnight. Carried a brief period of stratus on the
18z (11 am) tafs, but sites will be further evaluated through the
remainder of the 24 hour period. Ta

Marine Strong high pressure offshore will maintain northerly
winds through the weekend and into much of next week. Gale force
wind gusts will be most prevalent across the outer waters and near
cape mendocino through Saturday night. The pressure gradient will
relax briefly on Sunday, allowing wind gusts to fall below gale
force, and then increase again early next week. These persistent
north winds will generate very steep and building seas through the
weekend. The existing gale warnings and small craft advisories
will remain in effect. Additional advisories will be likely on
Sunday with potential warnings again for early next week. Kml

Fire weather Issued at 501 am pdt Fri jun 22 2018. We are
still looking at a period of greater risk for wildfire heading
into Saturday. However, fuel moisture and ercs are running near
normal for late june, and have not reached critical levels, though
they have been drying fast, with seasonal grasses curing. For
Saturday afternoon, drying offshore winds will bring afternoon
humidity into the teens. Rh values will only recover into the 30s
and upper 20s across the mountainous terrain of western mendocino
national forest and the trinity alps by Sunday morning. However,
winds are not expected to be very strong, which along with non-
critical fuels, should limit the potential for fire spread.

Greater potential exists for large fires to our southeast, across
the sacramento valley and foothills, as well as the north bay
hills. Aad

Eka watches warnings advisories
Ca... Heat advisory from 11 am to 9 pm pdt Saturday for caz110-111-113.

Northwest california coastal waters...

small craft advisory until 9 am pdt Sunday for pzz450.

Small craft advisory until 3 pm pdt this afternoon for pzz470.

Gale warning until 9 am pdt Sunday for pzz470.

Small craft advisory until 9 am pdt Sunday for pzz455.

Gale warning until 9 am pdt Sunday 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 mi53 min NW 4.1 G 6 55°F 54°F1019.5 hPa
46244 - Humboldt Bay, North Spit, CA 81 mi29 min 54°F7 ft

Wind History for North Spit, Humboldt Bay, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Weaverville, CA5 mi54 minW 710.00 miFair88°F44°F22%1013.9 hPa

Wind History from O54 (wind in knots)
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Last 24hrSW5NE3NE4CalmCalmNE3N3CalmCalmCalmCalmCalmCalmCalmCalmCalmS4S4S6W10
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1 day agoSW4SW6E3CalmN4N3NE3CalmNE3N3CalmCalmCalmSW4S4CalmSW5SE4SW8SW5SW7NW7SW4SW5
2 days agoNW3NE3CalmN3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmSW3CalmSE4SE3CalmSE3SW8W4Calm

Tide / Current Tables for Arcata Wharf, Humboldt Bay, California
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Arcata Wharf
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Fri -- 02:36 AM PDT     Moonset
Fri -- 03:17 AM PDT     1.28 feet Low Tide
Fri -- 05:45 AM PDT     Sunrise
Fri -- 09:06 AM PDT     4.82 feet High Tide
Fri -- 02:52 PM PDT     1.50 feet Low Tide
Fri -- 03:44 PM PDT     Moonrise
Fri -- 08:51 PM PDT     Sunset
Fri -- 09:27 PM PDT     6.94 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.12.81.81.31.422.83.84.54.84.64.13.32.41.71.51.92.83.95.26.36.96.96.2

Tide / Current Tables for Mad River Slough, Arcata Bay, Humboldt Bay, California
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Mad River Slough
Click for Map
Fri -- 02:36 AM PDT     Moonset
Fri -- 02:59 AM PDT     1.27 feet Low Tide
Fri -- 05:45 AM PDT     Sunrise
Fri -- 09:01 AM PDT     5.29 feet High Tide
Fri -- 02:33 PM PDT     1.50 feet Low Tide
Fri -- 03:44 PM PDT     Moonrise
Fri -- 08:51 PM PDT     Sunset
Fri -- 09:22 PM PDT     7.66 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.12.61.61.31.62.33.24.255.354.33.32.31.61.62.23.24.55.977.67.56.7

Weather Map and Satellite Images
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wmap_P
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 (22,6,7,8)
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Ground Weather Radar Station Medford, OR
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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.