Friday, August23, 2019 L-36.com


Marine Weather and Tides
Myrtle, CA

Version 3.4
NOTICE
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:33AMSunset 8:05PM Friday August 23, 2019 6:32 AM PDT (13:32 UTC) Moonrise 11:32PMMoonset 1:20PM Illumination 45% Phase: Third Quarter Moon; Moon at 23 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 248 Am Pdt Fri Aug 23 2019
Synopsis for northern california waters..Northerly winds will persist today, but start to diminish. Tonight and into the weekend northerlies will persist, but winds will become southerly near the coast in some locations, especially overnight. Also, steep short period waves will create hazardous ocean conditions for small craft through at least Saturday for the inner waters.


7 Day Forecast for Marine Location Near Myrtle, CA
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location: 40.8, -124.14     debug


Area Discussion for - Eureka, CA
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Fxus66 keka 231108
afdeka
area forecast discussion
national weather service eureka ca
408 am pdt Fri aug 23 2019

Synopsis A gradual warming trend is expected today through the
middle of next week, with triple digit heat expected across many
interior valley areas expected by Monday. Coastal areas are also
expected to see above normal temperatures, again especially early
next week. Little to no precipitation is expected.

Discussion Aside from limited patches near the klamath and eel
river deltas, marine stratus clouds are largely absent from the
north coast as of 4 a.M. Friday. This is a significant departure
from the prior morning, when widespread low stratus, fog, and
even some drizzle lingered well into the late morning. The root
cause is likely the rapid warming of temperatures in the lower
atmosphere, which is clearly being observed by the atmospheric
profiler at the arcata eureka airport. While stratus south of the
bay area does appear to be expanding and gradually spreading
northward, and high resolution models do indicate that at least
some redeveloping stratus is possible during the day, it seems
most likely that coastal areas will remain largely clear of clouds
and fog for most of the daylight hours Friday. However, a
gradually expanding ribbon of southerly flow along the immediate
coast will likely bring stratus back into some coastal areas late
this evening, at least as far north as CAPE mendocino, followed by
a reinforcing and expansive stratus shield from the west early
Saturday morning. Shallow stratus and fog will then likely follow
a typical pattern of moving inland overnight and lingering into
the morning hours before diminishing during the afternoon Saturday
and possibly Sunday, before gradually eroding Monday and Tuesday.

Sunny skies will continue across interior areas through at least
Tuesday.

Meanwhile, gradually building high pressure aloft throughout the
state is expected to drive a gradual warming trend today through
Wednesday, with the peak of the heat expected Monday through
Wednesday. Afternoon interior valley temperatures are expected to
climb from the mid to upper 90s Friday through Sunday, to between
100 and 105 degrees Monday through Wednesday... And perhaps locally
higher in a few of the warmer valleys. As a result, the threat of
light to moderate heat related impacts appears possible,
particularly Monday through Wednesday. The bulk of the heat
impacts are likely to be experienced across interior valley
locations during the afternoons, particularly in trinity county,
but even coastal areas are likely to observe above normal
temperatures by early next week. Still, low humidity and clear
skies will promote radiational cooling and cool air drainage in
interior valleys, and low temperatures are likely to fall into the
low 60s and even upper 50s overnight as a result. This will help
to mitigate heat impacts locally, but perhaps not quite as well in
areas to our east and northeast in the central valley and southern
oregon.

Between Tuesday and Thursday, a weak upper level impulse is
expected to move through the region from the southwest. This wave
will likely drive lower surface pressure and light southerly winds
across the waters. While it's possible that this could eventually
result in another surge of very shallow marine stratus from the
south, this will also likely lead to above normal coastal
temperatures Monday through Wednesday. Meanwhile, while
atmospheric moisture content appears to be meager, a small
potential for isolated and mostly dry thunderstorms will continue
to be monitored toward the middle of the week. Brc

Aviation Offshore flow has kept the coast mostly clear this
morning with only a few local patches of stratus as of 3:30 am. It
is possible the coastal airports could briefly be impacted around
sunrise, but this is looking less likely as the night progresses.

Confidence is high that there will remain clear through the
afternoon today. Northerly winds of 10 to 15 kt are possible this
afternoon along the coast with light winds inland.

Tonight winds at the coast are expected to turn southerly. This
could bring some stratus north to at least CAPE mendocino and it may
continue north Saturday morning. This will need to be monitored as
it gets closer. Mkk

Marine Northerly winds continue across much of the area this
morning, although some areas very near the coast are seeing
southerly winds. The winds have diminished slightly over the waters
and the gale warning set to expire at 5am looks on track. Seas will
also slowly diminish today and tonight. Will likely need to issue a
hazardous seas warning for the northern outer waters once the gale
expires.

Tonight seas in the outer waters are expected to drop below 10 feet.

For the weekend and into Monday winds and short period seas will
remain moderate to fresh. This will keep the steep seas around 7 to
10 feet and small craft advisories will likely be needed. Closer to
the coast local areas of southerly winds are expected. Most of these
will be around 5 to 10 kt, but a few local areas of 10 kt are
possible. These may not be captured in the coastal waters forecast,
but will continue to highlight them in the discussion.

A west to northwest swell around 3 feet at 12 seconds continues to
move through the waters. This is expected to continue through the
weekend.

Early next week winds will continue to diminish, although models are
now keeping northerlies in the outer waters through Monday. By mid-
week models are trying to show a trough or upper level low moving
into the area. The models are fairly confident that winds will be
light, but are struggling with the position of the low and the
direction of the surface winds. Mkk

Fire weather A gradual warming trend is expected to unfold
throughout the region between today and Wednesday, with the peak
of the heat expected between Monday and Wednesday. Inland
afternoon high temperatures are likely to climb from the mid to
upper 90s late in the week and over the weekend, to between 100
and 105 degrees Monday through Wednesday. In addition to the
increasing heat, humidity will also decrease, with low afternoon
minimums expected and moderate to poor recoveries. Winds are not
expected to be particularly strong on a large scale, and will be
driven by typical daytime onshore and nighttime offshore
fluctuations. Winds may become locally gusty on a smaller scale,
most likely in areas where the terrain favors stronger upslope and
upvalley wind development.

Meanwhile, little to no precipitation is expected for the
foreseeable future. However, while it remains unlikely in
northwest california, a very low chance for isolated dry
thunderstorms near the middle of next week is being monitored.

Brc

Eka watches warnings advisories
Ca... None.

Northwest california coastal waters... Small craft advisory until 5 pm pdt Saturday for pzz450-455.

Gale warning until 5 am pdt early this morning for pzz470.

Hazardous seas warning until 10 pm pdt this evening 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 mi56 min 56°F1009.2 hPa
46244 - Humboldt Bay, North Spit, CA 13 mi62 min 54°F9 ft
46022 - EEL RIVER - 17NM West-Southwest of Eureka, CA 21 mi32 min N 16 G 19 54°F1009.7 hPa (-0.3)
46213 - Cape Mendocino, CA (094) 47 mi32 min 54°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 mi39 minE 310.00 miFair50°F46°F89%1009.5 hPa
Fortuna Rohnerville Airport, CA17 mi37 minN 05.00 miOvercast50°F50°F100%1009.5 hPa

Link to 5 minute data for KACV

Wind History from ACV (wind in knots)
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Last 24hrS3S4SW3W5CalmNW6W7NW9NW11
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NW10N9NW7NW3SE6S6SE4SE5SE4E4SE3CalmCalmE3
1 day agoCalmCalmCalmSW4Calm3NW4N33NW7NW8CalmNW3N3CalmNW4CalmN3N9N6NW9N3S4S5
2 days agoCalmCalmCalmW3W4W7NW6NW6NW8W7NW6NW4NW4CalmCalmE4CalmE3CalmNW4E4E4CalmE4

Tide / Current Tables for Eureka Slough Bridge, Humboldt Bay, California
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Eureka Slough Bridge
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Fri -- 12:17 AM PDT     1.46 feet Low Tide
Fri -- 06:34 AM PDT     Sunrise
Fri -- 06:47 AM PDT     4.89 feet High Tide
Fri -- 07:58 AM PDT     Last Quarter
Fri -- 11:42 AM PDT     2.71 feet Low Tide
Fri -- 02:20 PM PDT     Moonset
Fri -- 06:27 PM PDT     6.97 feet High Tide
Fri -- 08:03 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.51.62.12.93.74.44.84.94.643.42.82.73.13.84.85.76.56.96.96.35.34.12.7

Tide / Current Tables for Humboldt Bay Entrance, California
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Humboldt Bay Entrance
Click for Map
Fri -- 12:12 AM PDT     1.44 feet Low Tide
Fri -- 06:06 AM PDT     3.78 feet High Tide
Fri -- 06:34 AM PDT     Sunrise
Fri -- 07:58 AM PDT     Last Quarter
Fri -- 11:37 AM PDT     2.66 feet Low Tide
Fri -- 02:21 PM PDT     Moonset
Fri -- 05:46 PM PDT     5.70 feet High Tide
Fri -- 08:03 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.41.622.63.23.63.83.73.53.22.92.72.733.64.45.15.65.75.44.8432.1

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 (9,2,3,4)
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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.