Thursday, March21, 2019 L-36.com


Marine Weather and Tides
Caspar, 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 7:13AMSunset 7:26PM Thursday March 21, 2019 5:01 AM PDT (12:01 UTC) Moonrise 7:32PMMoonset 7:02AM Illumination 100% Phase: Full Moon; Moon at 15 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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PZZ455 Cape Mendocino To Pt Arena Out 10 Nm- 246 Am Pdt Thu Mar 21 2019
.small craft advisory in effect from late tonight through Friday afternoon...
Today..S winds 5 to 10 kt. Waves W 7 ft at 15 seconds.
Tonight..SE winds 5 to 15 kt. Waves S 2 ft at 4 seconds...and W 8 ft at 14 seconds. Chance of rain.
Fri..SE winds 15 to 25 kt. Waves S 8 ft at 8 seconds...and W 8 ft at 15 seconds. Rain.
Fri night..W winds 5 kt. Waves S 4 ft at 6 seconds...and W 12 ft at 17 seconds.
Sat..NW winds 5 to 10 kt. Waves W 13 ft at 16 seconds.
Sun..SE winds 10 to 20 kt. Waves S 5 ft at 7 seconds...and W 9 ft at 12 seconds.
Mon..S winds 10 to 15 kt. Waves S 5 ft at 5 seconds...and W 9 ft at 13 seconds.
PZZ400 246 Am 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 Caspar, CA
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location: 39.35, -123.83     debug


Area Discussion for - Eureka, CA
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Fxus66 keka 211142
afdeka
area forecast discussion
national weather service eureka ca
442 am pdt Thu mar 21 2019

Synopsis Mostly dry conditions are expected today, but this
break in the rain will be short lived. Wet weather will resume
Friday, and periods of rain can be expected at various points
between Friday and the middle of next week.

Discussion Shower activity has waned throughout northwest
california as high pressure builds aloft. Lingering moisture from
yesterday's rain has resulted in the development of valley clouds
and patchy fog in many areas overnight, resulting in erratic visibility
reductions. This is likely to diminish gradually during the
morning hours today as the boundary layer begins to mix. While
this lingering low level moisture may contribute to a few light
afternoon showers across the interior mountains later today, most
areas will likely see only a robust cumulus field and dry
weather.

This brief reprieve from wet weather will come to an end late
tonight and early Friday morning as the next in a series of
progressive frontal system approaches the area. Light
precipitation will begin near the coast and across higher terrain
likely just prior to sunrise Friday, and steadily increase in
intensity as a cold front approaches. The heaviest of the rain is
likely to fall during a relatively brief period of 3 or 4 hours as
a cold front quickly sweeps inland, generally between late
morning and late afternoon give or take an hour or two depending
on the exact location. During this first wave of rain,
approximately 1 2" to 1" inch of total accumulations can be
expected, with some isolated higher amounts in the usual wet spots
like the king range and lower amounts in a few rain-shadowed low
elevations. Snow will generally be restricted to elevations above
4500 feet, keeping most passes clear with the exception of scott
mountain summit on highway 3 where 2 to 4 inches of new snow will
be possible by the end of the day Friday.

A relative break in the rain can be expected Friday evening and
overnight, but will quickly be followed by a round of scattered
showers as colder air aloft moves into the region. While these
initial morning showers will likely be somewhat weak and driven
primarily by modest instability over the ocean waters, as the cool
air aloft spreads inland during the day and surface temperatures
warm, more substantial instability may develop over interior
areas... Perhaps to the tune of 500 to 750 j kg of cape. As a
result, additional convective shower development is possible
Saturday afternoon across interior mountainous areas, especially
near the trinity alps. A few thunderstorms will also be possible,
especially if that degree of instability materializes. Primarily
dry conditions will return Sunday, with cool morning lows and
valley fog patchy frost expected in many interior areas.

Once again, this reprieve from the rain will be short-lived, as
another cold front and round of moderate rain is expected to
arrive sometime early late Sunday night. Confidence continues to
increase regarding the details of this system, and at this point
it is a near certainty that much of the region will see another
round of beneficial moderate rain Monday morning, with
accumulations again somewhat limited due to the progressive
nature of the passing cold front. While the details following this
Monday storm are somewhat murky, what is nearly certain at this
point is that an active pattern will continue, with at least one
additional cold front and round of rainfall expected around mid-
week... Potentially as early as Tuesday night. Unsettled and
showery conditions are then likely to continue through at least
Thursday, with a drying trend expected toward the weekend. Brc

Aviation Shower activity has dissipated across northwest
california overnight. Would not rule out an isolated shower this
afternoon around the mountains of northern or eastern trinity
county, otherwise expect a dry day. Lingering clouds are present
across inland portions of our area, with localized ifr to MVFR
conditions. Even where skies have cleared, patchy fog and low
clouds have developed in some valleys. Most of the area will see
sunshine andVFR conditions this afternoon, outside of any clouds
around the interior high terrain associated with the
aforementioned pop-up showers. After some early morning low
clouds or brief patchy fog, expect acv and cec to turn out mainly
clear today. Uki will have ifr to MVFR conditions in low clouds
until near midday. Winds will be light. A cold front will bring
some moderate rain and gusty southerly winds on Friday. Aad

Marine Today will feature relatively quiet marine conditions
as mainly light southerly winds are accompanied by a decaying
westerly swell of around 7 ft at 12 seconds. The forerunners of a
new long period swell will arrive by midday near 2-3 ft at 20
seconds. This swell will build to around 10-12 ft at 16 seconds by
late Friday. Additionally, a quick-moving cold front will
approach late tonight, with increasing southerly winds and short-
period seas. Have upgraded the gale watch to a warning for the
northern outer waters, with small craft advisories for the rest of
the waters from late tonight through Friday afternoon. Conditions
will be worst from mid-morning through early afternoon on Friday.

Winds will ease into Saturday and become more westerly. Steeper
seas will 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.

Aad

Eka watches warnings advisories
Ca... None.

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

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

Small craft advisory from midnight tonight to 4 pm pdt Friday
for pzz475.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46014 - PT ARENA - 19NM North of Point Arena, CA 11 mi21 min E 5.8 G 9.7 49°F 54°F1018.9 hPa49°F
ANVC1 - 9416841 - Arena Cove, CA 31 mi31 min E 8 G 8.9 42°F 53°F1019 hPa

Wind History for Arena Cove, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Ukiah Municipal Airport, CA36 mi65 minN 010.00 miOvercast41°F37°F89%1019 hPa

Wind History from UKI (wind in knots)
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Last 24hrCalmS4CalmS4CalmCalmSE5SE9
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Tide / Current Tables for Mendocino, Mendocino Bay, California
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Mendocino
Click for Map
Thu -- 12:04 AM PDT     5.82 feet High Tide
Thu -- 05:57 AM PDT     0.57 feet Low Tide
Thu -- 07:17 AM PDT     Sunrise
Thu -- 08:01 AM PDT     Moonset
Thu -- 12:02 PM PDT     6.01 feet High Tide
Thu -- 06:17 PM PDT     -0.07 feet Low Tide
Thu -- 07:28 PM PDT     Sunset
Thu -- 08:31 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.85.54.53.21.80.90.6123.34.65.665.74.73.21.70.5-00.112.23.64.9

Tide / Current Tables for Point Cabrillo, California Current
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Point Cabrillo
Click for Map
Thu -- 12:40 AM PDT     -0.00 knots Slack
Thu -- 03:23 AM PDT     -1.33 knots Max Ebb
Thu -- 06:51 AM PDT     0.00 knots Slack
Thu -- 07:17 AM PDT     Sunrise
Thu -- 08:01 AM PDT     Moonset
Thu -- 09:47 AM PDT     1.28 knots Max Flood
Thu -- 12:51 PM PDT     -0.00 knots Slack
Thu -- 03:44 PM PDT     -1.46 knots Max Ebb
Thu -- 07:19 PM PDT     0.00 knots Slack
Thu -- 07:28 PM PDT     Sunset
Thu -- 08:32 PM PDT     Moonrise
Thu -- 10:13 PM PDT     1.26 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.5-0.3-0.9-1.3-1.3-1-0.50.10.71.21.31.10.6-0.1-0.8-1.3-1.4-1.2-0.8-0.20.411.31.2

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 (8,2,3,4)
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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.