Friday, March22, 2019 L-36.com


Marine Weather and Tides
Weaverville, CA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:09AMSunset 7:23PM Thursday March 21, 2019 10:58 PM PDT (05:58 UTC) Moonrise 7:28PMMoonset 6:58AM Illumination 98% Phase: Waning Gibbous; Moon at 16 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 227 pm pst Fri feb 15 2019 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 222 pm pst, doppler radar indicated lines of showers and isolated Thunderstorms over the waters north of cape mendocino, capable of producing winds to around 30 knots and small hail. This activity was moving east-northeast at 30 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. && lat...lon 4174 12417 4154 12405 4153 12405 4154 12408 4124 12410 4114 12416 4089 12413 4084 12418 4086 12410 4082 12410 4065 12431 4060 12418 4062 12424 4063 12432 4045 12440 4047 12579 4129 12555 4168 12568 4178 12579
PZZ400 843 Pm Pdt Thu Mar 21 2019
Synopsis for northern california waters..Relatively light southerly winds will last through this evening. Another front will approach the coast Friday morning bringing strengthening southerlies and short period southerly seas. These conditions will be accompanied by a building w-nw swell on Friday as well. Winds will ease for the bulk of the weekend while seas remain elevated.


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 212238
afdeka
area forecast discussion
national weather service eureka ca
338 pm pdt Thu mar 21 2019

Synopsis Mostly dry conditions are prevailing today, but will
be short lived. Wet weather will resume Friday morning, with off
and on continued rain through at least the middle of next week. A
few thunderstorms will also be possible across the area on
Saturday.

Discussion A few isolated showers have popped up across the
higher terrain of trinity county this afternoon. Otherwise, the
rest of the area has remained dry with only some fair weather
cumulus. Once the Sun sets this evening the showers will quickly
diminish.

Tonight, high clouds will be on the increase ahead of the next
weather system that will begin to affect the region tomorrow
morning. Light precipitation should begin along the coast around
sunrise tomorrow morning especially along the mendocino coast.

Rain may be slightly delayed around humboldt bay due to strong
southeasterly winds which will prevent the rain from reaching the
surface early on. Rain will spread inland through the day Friday.

The bulk of the precipitation should be out of the area by Friday
evening with only a few lingering showers around the area. Snow
levels are expected to generally remain above 4500 feet for this
storm so widespread impacts are not anticipated.

Another impulse approaches the area Saturday morning. Modest
upper level divergence and vertical lift, combined with cold air
aloft will lead to an unstable airmass. 700-500mb lapse rates in
excess of 7 c km will lead to mucapes around 200-750 j kg
therefore, convectively enhanced showers and a few thunderstorms
will be possible late Saturday morning through the early evening.

As daytime heating comes to an end Saturday and instability
decreases, most of the showers and thunderstorms will diminish.

Skies will begin to clear Saturday night which will lead to
patchy valley fog and some frost across the area.

The next system is still on tap for late Sunday night into Monday.

This system will bring yet another quick hit of light to moderate
rain to the area. As the low clears the area Monday morning,
colder air aloft will once again filter into the region leading to
a slight threat for thunderstorms mainly across the northern
waters where instability should be maximized. This area may need
to be extended further inland in future forecasts however
instability at this point seems pretty weak over land. The wet and
unsettled weather pattern appears to continue through late next
week as an upper level low will sit across the NE pacific and
rotate disturbances across the area. Fortunately, most of these
systems will be quick hitters and have limited moisture associated
with them therefore at this time there are no hydro concerns.

Wci

Aviation After the clouds burned off this morning,VFR conditions
prevailed across northwestern california and are expected to
continue through this afternoon. A front approaching from the west
will bring some high clouds to the coast by this evening, and these
should slowly descend as the night wears on. Rain is expected at the
coast by early tomorrow morning along with low-level wind shear as
the front nears the coastline.

Tdj

Marine The forerunners of a new long period swell are just
starting to be felt by the buoys this afternoon, and this should
continue to fill in through tomorrow and peak around 13 ft at 16
seconds Saturday morning. Additionally, a quick-moving cold front
will approach late tonight, with increasing southerly winds and
short-period seas by early Friday morning. Conditions will be worst
during the mid-morning on Friday, before winds shift westerly and
ease later Friday afternoon. Steeper southerly seas will then
diminish, but the previously mentioned swell will keep overall seas
elevated. Combined seas may drop briefly below 10 ft late Sunday,
but another front will result in another period of stronger
southerly winds and steeper seas heading into Monday.

Tdj

Eka watches warnings advisories
Ca... None.

Northwest california coastal waters... Small craft advisory from 4 am Friday to 10 am pdt Saturday for
pzz450-455.

Gale warning from 4 am to 10 am pdt Friday for pzz470.

Small craft advisory from midnight tonight to 10 am pdt Saturday
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 mi82 min ESE 2.9 G 4.1 49°F 54°F1019.2 hPa
46244 - Humboldt Bay, North Spit, CA 81 mi58 min 52°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 mi63 minN 010.00 miMostly Cloudy41°F37°F87%1019 hPa

Wind History from O54 (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmS3CalmSW3SW3SW7NW3Calm--CalmNE3CalmCalmCalm
1 day agoE3CalmNE3CalmCalmE3E3CalmCalmNE7CalmNE3NE4E5CalmNE6NE6S4CalmCalmCalmCalmCalmCalm
2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmS3NE6S6E3CalmNE3NE3CalmNE5CalmNE4

Tide / Current Tables for Arcata Wharf, Humboldt Bay, California
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Arcata Wharf
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Fri -- 02:23 AM PDT     7.47 feet High Tide
Fri -- 07:16 AM PDT     Sunrise
Fri -- 08:35 AM PDT     Moonset
Fri -- 08:36 AM PDT     0.34 feet Low Tide
Fri -- 02:41 PM PDT     7.08 feet High Tide
Fri -- 07:30 PM PDT     Sunset
Fri -- 08:49 PM PDT     0.48 feet Low Tide
Fri -- 09:45 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.16.67.47.36.44.831.50.50.41.22.74.45.96.976.45.13.41.90.80.51.12.5

Tide / Current Tables for Eureka Slough Bridge, Humboldt Bay, California
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Eureka Slough Bridge
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Fri -- 02:07 AM PDT     8.03 feet High Tide
Fri -- 07:16 AM PDT     Sunrise
Fri -- 07:54 AM PDT     0.24 feet Low Tide
Fri -- 08:35 AM PDT     Moonset
Fri -- 02:25 PM PDT     7.61 feet High Tide
Fri -- 07:30 PM PDT     Sunset
Fri -- 08:07 PM PDT     0.39 feet Low Tide
Fri -- 09:45 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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6.27.587.66.24.22.20.70.20.823.75.46.87.57.46.44.62.61.10.40.71.93.6

Weather Map and Satellite Images
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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 (1,6,7,8)
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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.