Monday, May29, 2017 L-36.com


Marine Weather and Tides
Weaverville, CA

Version 3.4
What's New / NOTES
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
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.

Sunrise 5:40AMSunset 8:33PM Sunday May 28, 2017 10:44 PM PDT (05:44 UTC) Moonrise 7:52AMMoonset 10:41PM Illumination 14% Phase: Waxing Crescent; Moon at 4 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
    EDIT      (on/off)   Help
This is a Weather Statement Zone, please check the Date to see if it has expired
PZZ410 1227 pm pdt Wed apr 19 2017 a marine weather statement has been issued for the following areas... Coastal waters from cape mendocino to pt. Arena ca out 10 nm... Coastal waters from pt. St. George to cape mendocino ca out 10 nm... Humboldt bay bar... Waters from cape mendocino to pt. Arena ca from 10 to 60 nm... Waters from pt. St. George to cape mendocino ca from 10 to 60 nm... Scattered Thunderstorms will continue to develop through 3 pm. The main storm hazards will be dangerous cloud to water lightnig...wind gusts to 40 knots or more...small hail...and waterspouts. 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.ground 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 4174 12417 4156 12410 4150 12398 4153 12407 4154 12408 4089 12413 4076 12423 4087 12414 4085 12409 4083 12408 4065 12431 4060 12416 4051 12413 4063 12432 4043 12441 4044 12581 4129 12555 4168 12568 4178 12579
PZZ400 829 Pm Pdt Sun May 28 2017
Synopsis for northern california waters..North winds will increase through Mon as high pressure offshore builds toward the coast. Short period wind waves will build as a result and peak by Mon evening. Northerly winds will ease Tue and Wed as the offshore ridge becomes perturbed by a front.

7 Day Forecast for Marine Location Near Weaverville, CA
   Hourly   EDIT   Help
location: 40.78, -122.83     debug


Area Discussion for - Eureka, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 keka 282245
afdeka
area forecast discussion
national weather service eureka ca
345 pm pdt Sun may 28 2017

Synopsis Warm interior temperatures will continue through
Monday with seasonable readings along with low clouds near the
coast. Isolated thunderstorms may develop over the interior
mountains Monday afternoon.

Discussion A sharp upper ridge of high pressure over the
pacific states will gradually shift E as a low pressure trough
pivots toward the N ca coast. Low cloudiness continues to blanket
much of the redwood coast this afternoon with several eddies in
the cloud-level flow evident over the coastal waters. Clouds over
the coastal river valleys have slowly eroded due to daytime
heating and low-level mixing. N flow over the coastal mountains of
sw humboldt county has led to clearing skies downwind due to
downsloping. Some small CU development has been noted over
portions of S trinity county into portions of the yolla bollys.

Through the evening, expect a few showers to develop over the
interior. However, at this time, not expecting any thunderstorm
development. A few breaks in the coastal low clouds are expected
to be short-lived, as clouds thicken back up overnight. A modest
increase in low-level northerlies will lead to enough moisture
pooling and orographic lift to produce some patchy drizzle along
portions of the redwood coast through Monday night, especially
near humboldt bay and just N of CAPE mendocino.

The combination of increased low-level moisture and instability,
along with some weak dynamic forcing associated with the
approaching upper trough and vorticity, will lead to an increased
shot at convection over the interior Monday afternoon. Isolated
thunderstorms are possible, mainly over trinity county. Even
better chances of showers are expected on Tuesday, but, as
mentioned by previous shifts, instability will be waning during
this time frame as cooler air moves into the area. For now, have
continued to just mention showers on Tuesday.

A couple of weak surface fronts will approach the or coast through
mid-week, but these will mainly serve to increase cloudiness
across parts of our county warning area. Heights are expected to
build over the W coast by late in the coming week, with decreasing
chances of rain and warmer temperatures. Maximum temperatures may
once again rise into the 90s over portions of the interior by
next weekend. Sec&wci

Aviation The marine layer will continue to shrink in depth
tonight through Monday as the air aloft warms. Greatest change in
the last 24 hours has been south of CAPE mendo where the bodega bay
profiler indicated a depth up to 500 meters. The change in the depth
at acv was not as dramatic and ceilings have been very similar to
the day before.

Warming aloft coupled with northerly surface flow offshore will keep
stratus locked into coastal areas tonight and probably through most
of the day on Monday. Ceiling have been mostly MVFR today, but
should fall to high ifr this evening as the daytime heating abates.

Confidence is not high vsbys and CIGS will crash to lifr mon
morning, so based the forecast on persistence. With slightly
stronger northerly flow offshore, areas of clear skies will form
downwind of the capes on Monday. It is possible for kcec to scatter
out, though small scale eddies nearshore will completely ruin that
forecast.

Stratus did not make it into kuki last night or this morning. It was
close, just over the ridgeline to the west. With northerly flow
offshore and a shallower marine layer the chance for stratus at kuki
does not look very good. The statistical guidance has it creeping
into kuki around daybreak Monday, so will hint at the possibility
with only scattered clouds near 1000 feet.

Marine North-northwest winds for the most part returned to the
coastal waters today. Northerly winds will be borderline for an
advisory in the waters south of CAPE mendocino late tonight. High
resolution models indicate a weak expansion fan developing downwind
of CAPE mendo by Monday morning. Steep short period northerly wind
waves are expected to build to 5 to 7 ft on Monday as winds reach 20
to 25 kt. Therefore, a small craft advisory has been hoisted for the
offshore waters south of CAPE mendo.

Marginal advisory conditions with steep waves will likely continue
into Monday night south of CAPE mendo. A front will knock down the
offshore ridge on Tue and north winds will diminish though the day
on Tue into wed.

It is probably going to take til the end of the week (fri) or next
weekend (sat and sun), for winds and short period wind waves to ramp
up significantly again. High pressure is forecast to build closer to
the west coast on Friday while a thermal trough develops near the
northern california coast by sat.

Eka watches warnings advisories
Ca... None.

Northwest california coastal waters...

small craft advisory from 3 am Monday to 5 am Tuesday for pzz475.

Visit us at http:

Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
HBYC1 - 9418767 - North Spit, CA 74 mi69 min N 15 G 18 52°F 53°F1020.2 hPa
46244 - Humboldt Bay, North Spit, CA 81 mi24 min 53°F4 ft

Wind History for North Spit, Humboldt Bay, CA
(wind in knots)    EDIT      (on/off)   Help
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
Last
24hr
N5
N7
NW7
N4
G7
N8
NW8
NW9
N4
NE6
NE5
NE6
NE5
N4
N6
N5
NW5
NW5
NW7
N11
N11
G14
N16
N11
N15
N17
1 day
ago
S2
S3
S1
--
SE1
S1
--
E1
SE3
E4
SE4
S2
SW2
SW4
S4
W9
W4
W9
W6
W9
W8
NW8
NW8
N6
2 days
ago
S9
S11
S10
G13
SW13
SW14
G17
SW17
G21
SW17
G22
SW13
G19
SW10
G14
SW13
G17
SW10
G14
SW9
G12
SW9
G12
SW9
G12
SW8
G11
SW8
W4

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Weaverville, CA5 mi70 minNNE 310.00 mi66°F51°F60%1016.9 hPa

Wind History from O54 (wind in knots)
11
PM
-12
PM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
Last 24hrCalmCalmN3CalmCalmCalmCalmCalmCalmCalmSW3CalmS4SW4SW5S3NE4SW7S4CalmSW6CalmCalmNE4
1 day agoCalmE3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmSW3S3E5S7S3SE4NE4NE6E3N3CalmCalm
2 days agoCalmNE3CalmCalmCalmCalmCalmCalmCalmN3NE4CalmSE4SW6SE6S3S4S6S3SE3CalmNE3NE3Calm

Tide / Current Tables for Arcata Wharf, Humboldt Bay, California
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Arcata Wharf
Click for Map
Mon -- 03:21 AM PDT     7.46 feet High Tide
Mon -- 05:48 AM PDT     Sunrise
Mon -- 10:03 AM PDT     Moonrise
Mon -- 10:22 AM PDT     -1.56 feet Low Tide
Mon -- 05:12 PM PDT     5.95 feet High Tide
Mon -- 08:39 PM PDT     Sunset
Mon -- 10:28 PM PDT     2.59 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.55.86.87.47.36.44.82.90.9-0.7-1.5-1.4-0.41.12.74.35.45.95.85.14.13.22.72.7

Tide / Current Tables for Mad River Slough, Arcata Bay, Humboldt Bay, California
   EDIT      (on/off)   Help   One Week of Data
Mad River Slough
Click for Map
Mon -- 03:17 AM PDT     8.25 feet High Tide
Mon -- 05:48 AM PDT     Sunrise
Mon -- 10:03 AM PDT     Moonrise
Mon -- 10:03 AM PDT     -1.77 feet Low Tide
Mon -- 05:07 PM PDT     6.56 feet High Tide
Mon -- 08:40 PM PDT     Sunset
Mon -- 10:09 PM PDT     2.66 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.16.57.68.286.94.92.70.5-1.1-1.8-1.3-0.11.63.34.96.16.66.35.44.23.22.72.9

Weather Map and Satellite Images
       (on/off)   Help
Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of CentralWestCoast    EDIT
Geos

Wind Forecast for Eureka, CA (1,6,7,8)
      (on/off)   Help

Ground Weather Radar Station Medford, OR
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.