Thursday, September23, 2021
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Marine Weather and Tides
Etna, CA

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:58AMSunset 7:07PM Thursday September 23, 2021 7:27 PM PDT (02:27 UTC) Moonrise 7:41PMMoonset 8:38AM Illumination 93% Phase: Waning Gibbous; Moon at 17 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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PZZ450 Pt St George To Cape Mendocino Out 10 Nm- 239 Pm Pdt Thu Sep 23 2021
Tonight..N winds 5 to 10 kt. Waves N 6 ft at 7 seconds...and W 4 ft at 12 seconds.
Fri..S winds 5 kt. Waves nw 7 ft at 8 seconds. Patchy fog.
Fri night..S winds 5 kt. Waves nw 5 ft at 11 seconds. Patchy fog.
Sat..SW winds 5 kt. Waves nw 4 ft at 12 seconds.
Sat night..SW winds 5 kt. Waves nw 5 ft at 12 seconds.
Sun..S winds 5 to 10 kt. Waves W 5 ft at 13 seconds.
Mon..S winds 5 to 15 kt. Waves W 7 ft at 12 seconds.
Tue..N winds 5 to 10 kt. Waves nw 13 ft at 14 seconds.
PZZ400 239 Pm Pdt Thu Sep 23 2021
Synopsis for northern california waters..Northerlies will remain elevated over the outer waters and near headlands through this evening. Lighter winds and diminishing seas are forecast Friday through the weekend. A series of small, mid-period northwesterly swells will continue to roll in this week and over the weekend. A larger nw swell from a northeast pacific storm may impact the waters around Tuesday.


7 Day Forecast for Marine Location Near Etna, CA
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location: 41.34, -123.02     debug


Area Discussion for - Medford, OR
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FXUS66 KMFR 232117 AFDMFR

Area Forecast Discussion National Weather Service Medford OR 217 PM PDT Thu Sep 23 2021

DISCUSSION. Satellite imagery shows clear skies across southern Oregon and northern California. This is part of an area of high pressure building over the area which has created a thermal trough as well. The thermal trough will push inland tomorrow, bringing another round of warm to hot temperatures. This ridge of high pressure will begin to degrade over the weekend ahead of the next front coming through on Monday. Overall, expect a rain-free weekend with sunny afternoons.

Then on Monday, the next front comes through. Ensembles show some broad timing from a few runs showing the trough moving in on Monday morning versus others pushing the arrival time back toward the evening. Therefore, confidence is quite high that we will see rainfall, with the start time having low confidence. Our best guess is that the front will arrive in the late morning and pushing inland in the evening.

In all, this front will have the potential to generate wetting rainfall, particularly for areas west of the Cascades. However, do not believe that this system will be the one to end fire season completely, especially for areas in northern California where lesser rain amounts are expected. The bulk of the rainfall will occur at the coast and the coast mountains and to the north with lesser amounts on the east side and in northern California.

The other set of "good news" (if you like rain), is that this system is setting up similarly, albeit with less moisture, to help preclude some of the orographic downsloping in the Rogue Valley-- which could help us see some more rain. This is reflected in the forecast, but confidence on this aspect is relatively low. Impacts will be relatively minimal as well.

After the front moves through, showers will continue Tuesday and possibly Wednesday. Showers should be mostly light, except a thunderstorm could pop up across portions of Douglas County and the southern Oregon Cascades. Ensembles then start to dry things out slowly over the weekend keeping the zonal flow. Overall, expect temperatures to be more fall-like for the majority of next week. -Schaaf

AVIATION. 23/18Z TAFs . VFR conditions should prevail across the forecast area throughout the TAF period. Gusty north winds are likely this afternoon/evening at North Bend, then gusty east winds and some mountain wave turbulence are expected over higher terrain, especially the Cascades and the coastal ranges, overnight. -BPN

MARINE. Updated 200 PM PDT Thursday 23 September 2021 . A thermal trough along the coast will continue to produce gusty north winds and steep to very steep seas through tonight. The strongest winds and steepest seas will be south of Cape Blanco. The thermal trough will push inland tonight into Friday morning, allowing winds to weaken, but seas will remain steep until residual wind seas diminish Friday afternoon. Relatively calm conditions are then expected through Saturday night, with south winds and seas increasing ahead of an approaching cold front Saturday night into Sunday. After the front passes Monday, seas will remain elevated and steep through the first part of next week due to building northwest swell. -BPN

FIRE WEATHER. Updated 200 PM PDT Thursday 23 September 2021 . Overall, relatively quiet weather is expected through the weekend. The only concern in the short term is moderate to locally poor overnight humidity recoveries near and at the ridges in fire zones 618, 619, and western 280 tonight. Recoveries in these areas should improve some Friday night into Saturday morning, but still could not rule out locally poor overnight recoveries in portions of 280.

Dry weather will continue through the weekend with the warmest afternoon temperatures expected to be on Friday. Temperatures will be highest in the Rogue, Illinois, and Klamath River Valleys where max values could end up in the lower to mid 90s. East of the Cascades will not be as hot, but still we an expect values in the lower to mid 80s. Slight cooling is expected Saturday and Sunday as the upper ridge flattens out with increasing onshore flow.

Winds through Sunday are not expected to be much of a concern. Typical afternoon breezes east of the Cascades, but nothing that is considered noteworthy.

There's fairly good agreement among the operational models and ensemble members for an increase chance for wetting rain Sunday night into early next week along and west of the Cascades. An upper trough will deepen offshore and at the same time, a cold front will approach southwest Oregon. Unlike the last one, this front does not have a deep moisture fetch, therefore rainfall amounts are not going to be significant like the one the weekend of September 18th. However, the coastal mountains in southwest Oregon, coast and Cascades could still pick up a decent amount of rainfall. Interior westside valleys are also likely to get wetting rain, but amounts will be less compared to the aforementioned areas.

Meanwhile gusty winds are looking more likely east of the Cascades before the precipitation arrives Tuesday night as the upper trough moves overhead.

Tuesday is shaping up to be a cool and unsettled day, however the amount and areas that will have the best chance for precipitation will depend on the timing of the upper trough passage. Also colder air aloft will move overhead and if the upper trough is slower to exit out, then isolated storms are not out of the question Tuesday afternoon.

After Tuesday, the general consensus in the 8 to 14 day periods points to a strong upper ridge in the eastern third of the U.S. with a general troughiness in the Pac NW which would favor a progressive pattern in which a series of systems will move through. That's not to say we'll have precipitation all time. Most likely there will be dry breaks, but they will be of shorter duration. If nothing else, temperatures are likely to be near or slightly below normal. -Petrucelli

MFR WATCHES/WARNINGS/ADVISORIES. OR . CA . None.

Pacific Coastal Waters . Small Craft Advisory until 5 AM PDT Friday for PZZ350-356-370-376. Hazardous Seas Warning until 5 AM PDT Friday for PZZ356-376.


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CECC1 - 9419750 - Crescent City, CA 68 mi57 min NNW 8 G 9.9 63°F 56°F1012.3 hPa
HBYC1 - 9418767 - North Spit, CA 75 mi51 min 55°F1013.6 hPa
46244 - Humboldt Bay, North Spit, CA 77 mi61 min 54°F7 ft

Wind History for Crescent City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mount Shasta, CA37 mi31 minN 010.00 miFair70°F39°F32%1019.9 hPa

Link to 5 minute data for KMHS

Wind History from MHS (wind in knots)
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Last 24hr34334CalmCalmCalmNE3CalmCalmNE3CalmCalmCalmCalmCalm--44343Calm
1 day agoNE3CalmCalmCalmCalmCalm--CalmE3NE3CalmCalm--CalmCalm----3Calm4336NW4
2 days agoCalmCalmNE3CalmNE3CalmCalmCalmCalmCalmCalmCalmNE3CalmCalmCalmCalmCalmCalm3CalmCalmCalmCalm

Tide / Current Tables for Trinidad Harbor, California
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Trinidad Harbor
Click for Map
Thu -- 01:41 AM PDT     6.09 feet High Tide
Thu -- 07:05 AM PDT     Sunrise
Thu -- 07:37 AM PDT     1.38 feet Low Tide
Thu -- 09:42 AM PDT     Moonset
Thu -- 01:45 PM PDT     6.52 feet High Tide
Thu -- 07:11 PM PDT     Sunset
Thu -- 08:11 PM PDT     0.70 feet Low Tide
Thu -- 08:45 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.25.96.15.54.53.32.21.51.4234.35.56.36.564.93.62.21.20.70.91.72.9

Tide / Current Tables for Arcata Wharf, Humboldt Bay, California
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Arcata Wharf
Click for Map
Thu -- 02:46 AM PDT     6.25 feet High Tide
Thu -- 07:05 AM PDT     Sunrise
Thu -- 08:46 AM PDT     1.37 feet Low Tide
Thu -- 09:42 AM PDT     Moonset
Thu -- 02:53 PM PDT     6.77 feet High Tide
Thu -- 07:11 PM PDT     Sunset
Thu -- 08:45 PM PDT     Moonrise
Thu -- 09:21 PM PDT     0.83 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.15.36.16.25.84.83.62.41.61.41.934.45.66.56.86.45.442.61.50.911.7

Weather Map
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GEOS Local Image of CentralWestCoast    EDIT
NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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