Thursday, March23, 2017 L-36.com


Marine Weather and Tides
Weaverville, CA

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 7:04AMSunset 7:27PM Thursday March 23, 2017 3:08 PM PDT (22:08 UTC) Moonrise 3:33AMMoonset 1:57PM Illumination 14% Phase: Waning Crescent; Moon at 26 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 /o.can.keka.ma.w.0062.000000t0000z-161123t1115z/ 301 Am Pst Wed Nov 23 2016
.the special marine warning is cancelled... The affected areas were... Coastal waters from pt. St. George to cape mendocino ca out 10 nm... Humboldt bay bar... The Thunderstorms have moved out of the area and no longer pose a significant threat to boaters. Lat...lon 4083 12412 4082 12417 4085 12417 4076 12423 4081 12418 4082 12413 4080 12418 4077 12420 4075 12419 4075 12422 4070 12426 4071 12427 4044 12442 4044 12443 4050 12450 4087 12429 4087 12416 4086 12417 4085 12409 time...mot...loc 1058z 282deg 14kt 4078 12425 4051 12443 4020 12433
PZZ400 204 Pm Pdt Thu Mar 23 2017
Synopsis for northern california waters..An approaching front will bring southerly gales to the coastal waters through tonight. Isolated storm force gusts will be possible across the northern outer waters. Winds will decrease behind the front on Friday and turn northerly on Saturday. Expect large wind driven waves to accompany the gales and decaying westerly swells over 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 231123
afdeka
area forecast discussion
national weather service eureka ca
423 am pdt Thu mar 23 2017

Synopsis
Gusty winds are likely early this evening through Friday morning
across portions of humboldt and del norte counties. Widespread
rainfall will overspread the region as well during this time, some
of which may be locally heavy at times. A more showery pattern will
commence Friday night through early Sunday, before another storm
system potentially brings more gusty winds and widespread rainfall
to the region in the Sunday through Monday time frame.

Discussion
Short term
(today through Friday)
enjoy the dry weather today, as it'll quickly come to an end by
tonight. Early this morning, temperatures have dropped below 37
degrees (the temperature at which frost typically starts to form) at
a few locations of mendocino county, but so far it's been pretty
limited. Still, with a few more hours before sunrise and mainly
clear skies dominating the county, will leave the frost advisory in
tact through its 8 am expiration time.

Otherwise, a strong storm system will continue to develop as it
passes by to our northwest. A trailing cold front will approach the
redwood coast this evening and cross the area overnight. Ahead of
this feature, a strong 925mb jet in the 55 to 60 knot range will
develop across the outer waters and coastal ridges, with gusts to 55
mph a good bet for coastal del norte county. Slightly higher gusts
near 65 mph are also a good bet for portions of the kings range and
for interior humboldt and del norte counties. Farther south along
coastal mendocino county, the latest 06z data also continues to show
a slight upward trend in not only the low-level jet wind speeds but
how far south it extends, with the latest data showing winds of 40
to 45 knots at this level. As such, we were tempted to extend the
advisory down to this area but will defer to the day shift for a
possible late morning update, so we can look at some of the daytime
hi-resolution data and satellite imagery, to ensure enough breaks
will be present in the approaching cloud cover. This could be a
pivotal point as increased insolation would enhance downward
momentum transfer potential via increased mixing.

As if that wasn't enough, the real "fun" could be with the
approaching cold front, as widespread rainfall develops along and
behind it, some of which may be heavy at times. As you know, the
soils remain saturated to a large extent, and although the heavy
rainfall could result in more mudslides in itself, the prolonged wind
torque on the trees near and west of the coastal ridges could only
exacerbate this concern. With several area roads currently under
construction/repair from this winter, you may want to keep updated
on road conditions if you have any travel plans over the next few
days.

Long term
(Friday evening through Wednesday)
things will start to wind down in the Friday evening through
Saturday night time frame, as precipitation becomes more showery in
nature while decreasing in areal coverage. By Saturday night into
Sunday morning, little if any precipitation should be present
across the forecast area. However, as you might have guessed, this
will be another short-lived "dry spell", as another storm system
will be making in-roads to our neck of the woods by Sunday evening.

A storm system approaching the pacific northwest coast will send a
trailing cold front eastward across the area Sunday night/Monday
morning.

Similar to this first system, another strong (albeit slightly
weaker) low-level jet will develop, with current indications showing
925mb winds around 50 knots from CAPE mendocino northward. Should
this solution verify, gusty winds likely at advisory levels would
affect portions of humboldt and del norte counties once again.

Widespread rainfall, some of it of moderate to locally heavy
intensity would develop along the front as it treks eastward.

The weather pattern will start to calm down by the middle of next
week, as an area of high pressure at the surface and aloft develops
across the eastern pacific, while attempting to build eastward
across northwestern california. As it stands now, mendocino county
would see an extended period of dry weather, with perhaps a few
showers developing north of there. We'll see if this "drier theme"
continues in the numerical forecasts as we head through the weekend.

/pd

Aviation
Vfr conditions should continue for majority of the
day before a frontal boundary brings deteriorating conditions as
widespread rain impacts northwest california late this afternoon.

Rain will continue through most of the night into early Friday
morning as the front tracks to the southeast. Expect MVFR conditions
with the onset of the rain later today with periods of ifr. In
addition to rain, south winds will increase through the day bringing
strong gusts this evening with the strongest gusts across exposed
ridgetops. Low level wind shear will also be a concern with the
frontal passage this evening. /kml

Marine
The gale warnings and small craft advisory remain in
effect for late this afternoon as a robust frontal boundary tightens
the pressure gradient across the coastal waters. There was, however,
a last minute change to hoist a new gale warning for the northern
inner waters. This system may be strong enough to bring some
isolated storm force gusts across the northern outer waters thus
more frequent gale force gusts nearshore seems plausible with the
well mixed airmass. The strongest winds nearshore will primarily be
located near point saint george, CAPE mendocino, and point arena
with occasional gale force gusts expected southward of the cape.

After this round of potent southerlies, winds will steadily decrease
behind the front on Friday as surface ridging shifts over the region
and turns winds out of the north by Saturday. This will be
shortlived as models show another front bringing fresh winds to near
gales for Sunday.

Wind driven seas will become large and steep with the frontal
passage this afternoon and evening. As steep waves steadily subside
on Friday, a westerly swell will enter the waters and decay through
the weekend. Steep seas will make a comeback with the late-week
front. /kml

Eka watches/warnings/advisories
Ca... Wind advisory from 5 pm this afternoon to 5 am pdt Friday for
caz101-102-104>106.

Frost advisory until 8 am pdt this morning for caz110-111.

Northwest california coastal waters... Small craft advisory from noon today to 3 pm pdt this afternoon
for pzz450.

Gale warning from 3 pm this afternoon to 3 am pdt Friday for
pzz450-470-475.

Small craft advisory from noon today to 9 am pdt Friday for
pzz455.

Small craft advisory from 9 am this morning to 3 pm pdt this
afternoon for pzz470-475.

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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 mi93 min SSW 20 G 26 53°F 54°F1020.1 hPa
46244 - Humboldt Bay, North Spit, CA 81 mi48 min 53°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 mi74 minSE 310.00 mi55°F33°F44%1019.6 hPa

Wind History from O54 (wind in knots)
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SW5SW6SW6NE3N3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmS3CalmSW3CalmCalm
1 day agoW7SW3W9
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SW8CalmNW4CalmCalmSW4CalmCalmCalmCalmCalmCalmCalmSW3S4CalmSW7S9S6SW10
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NE5NE4CalmCalmCalmN4CalmNE4CalmNE3CalmCalmCalmCalmS3CalmCalm--W7SW4SW9
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Tide / Current Tables for Arcata Wharf, Humboldt Bay, California
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Arcata Wharf
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Thu -- 03:40 AM PDT     3.22 feet Low Tide
Thu -- 04:38 AM PDT     Moonrise
Thu -- 07:14 AM PDT     Sunrise
Thu -- 09:30 AM PDT     6.07 feet High Tide
Thu -- 03:02 PM PDT     Moonset
Thu -- 04:31 PM PDT     0.60 feet Low Tide
Thu -- 07:32 PM PDT     Sunset
Thu -- 11:08 PM PDT     5.33 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.64.23.73.33.23.64.24.95.6665.54.63.52.31.30.70.71.22.13.24.255.3

Tide / Current Tables for Mad River Slough, Arcata Bay, Humboldt Bay, California
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Mad River Slough
Click for Map
Thu -- 03:21 AM PDT     3.34 feet Low Tide
Thu -- 04:38 AM PDT     Moonrise
Thu -- 07:14 AM PDT     Sunrise
Thu -- 09:25 AM PDT     6.68 feet High Tide
Thu -- 03:02 PM PDT     Moonset
Thu -- 04:12 PM PDT     0.54 feet Low Tide
Thu -- 07:32 PM PDT     Sunset
Thu -- 11:03 PM PDT     5.86 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
54.43.83.43.43.94.75.56.26.66.65.94.83.52.110.50.71.52.53.74.85.65.9

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 (18,4,5,8)
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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.