Thursday, December12, 2019
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Marine Weather and Tides
Yreka, CA

Version 3.4
NOTICE
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
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 7:28AMSunset 4:40PM Thursday December 12, 2019 5:15 AM PST (13:15 UTC) Moonrise 5:23PMMoonset 7:53AM Illumination 99% 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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PZZ450 Pt St George To Cape Mendocino Out 10 Nm- 244 Am Pst Thu Dec 12 2019
.small craft advisory in effect through late Friday night...
Today..S winds 10 to 15 kt. Waves S 6 ft at 7 seconds...and W 15 ft at 18 seconds. Showers likely. Rain.
Tonight..S winds 5 to 15 kt. Waves W 15 ft at 17 seconds. Rain likely.
Fri..SW winds 5 to 15 kt. Waves sw 3 ft at 4 seconds...and W 15 ft at 16 seconds. Rain.
Fri night..NW winds 5 to 10 kt. Waves W 2 ft at 4 seconds... And W 13 ft at 16 seconds.
Sat..SW winds 5 to 10 kt. Waves nw 11 ft at 14 seconds. Showers and slight chance of tstms.
Sun..NE winds 5 kt. Waves W 11 ft at 13 seconds.
Mon..SE winds 5 to 10 kt. Waves nw 7 ft at 14 seconds.
PZZ400 244 Am Pst Thu Dec 12 2019
Synopsis for northern california waters..An mildly active weather pattern continues to drive moderate south and southwest winds across the coastal waters. A large, long period west to northwest swell is forecast to impact the waters today and Friday.


7 Day Forecast for Marine Location Near Yreka, CA
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location: 41.75, -122.64     debug


Area Discussion for - Medford, OR
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FXUS66 KMFR 121100 AFDMFR

Area Forecast Discussion National Weather Service Medford OR 300 AM PST Thu Dec 12 2019

DISCUSSION. 13/00Z NAM/GFS/EC in.

There is widespread light precipitation across the Medford CWA this morning. The 12/00Z MFR sounding recorded a freezing level of 7500 feet, indicating the snow level around that time was 6500 feet.

The northern hemispheric pattern shows a wave number of 4 to 5 around the globe, which usually is a progressive pattern. That will be the case here. A ridge over the intermountain states continues to break down with a broad upper trough offshore.

Brisk quasi-zonal upper level flow will persist into Saturday with the jet stream pretty much focused on the Medford CWA. This will support low amplitude quick-moving systems moving onshore in rapid succession.

It will be quite wet over the Medford CWA into Friday evening, especially in the Coast Range. Storm total precipitation amounts from now through Friday evening will be 0.5-2.0 inches along the coast and up to 4.0 inches in the Coast Range. The Cascades will see 1.5-3.0 inches. Most other inland areas will see 0.5-1.0 inches of precipitation. The dry spot will be Lake County east of Winter Rim, which will see 0.25-0.5 inches. Snow levels will remain high, generally above 6000 feet through Thursday.

Rivers will rise quite a bit, but given the antecedent low stage levels, they should remain well below flood stage. Some small stream flooding may occur though.

Winds will also be a factor, especially today. Gusty south to southwest winds will be strongest over the mountains, but gusts to around 40 mph are expected into the southern Shasta Valley Thursday afternoon and gusts to 45 mph will occur in the Summer Lake area through Thursday evening.

Thicknesses will fall Thursday night into Friday and snow levels will lower to 4000-5000 feet Friday morning over Oregon and 5000-5500 feet over northern California. With continued showers during this period, moderate snow is likely Thursday night into Friday in the Southern Oregon Cascades, mainly in the Diamond Lake and Crater Lake areas, and over the Siskiyous and Coast Range from south central Siskiyou county northwest into the Kalmiopsis. Snow levels will fall further to around 3000 feet Saturday morning, but precipitation will be waning by that time.

Long term discussion from the Wednesday afternoon AFD . Sat 14 Dec though Wed 18 Dec 2019. There's decent agreement among the operational and ensemble models that the pattern will remain fairly active during the forecast period. It's all going to come down to the timing and details of individual systems.

On Saturday, we'll be on the colder side of things as a weak upper trough will move in from the northwest in the afternoon. Snow levels are expected to range between 3000 and 3500 feet and much will depend on precip intensity. For the most part it should be on the light side during the day, but could pick up in intensity Saturday night with snow levels around 3000 feet. Even then snow accumulations are not expected to be a high concern for the higher passes along the Cascades, Siskiyou Summit and Diamond Lake area. Preliminary estimates show generally 1-3 inches from Saturday afternoon into Sunday morning, but details on this could change in the coming days.

The operational models show different solutions Sunday through Sunday night. The ECMWF shows overrunning precipitation from a warm front moving into the area while the GFS is drier with warm frontal precipitation arriving Monday morning. This is also in line with the respective ensembles. For now did not make much change to the pops during this time.

Ridging builds into the area Monday with dry conditions expected. Another upper trough could end up splitting as it moves into the shortwave ridging Tuesday. There's a timing difference with this one and we could end up staying dry, but confidence remains low. More systems will head in our direction Wednesday through Wednesday night. -Petrucelli

AVIATION. For the 12/06Z TAFs . The main concern will remain low level wind shear for along the coast and inland westside locations until around midnight/08Z. There were some pirep reports of wind speed shear as low as 300 feet earlier this afternoon at the Medford Airport. Guidance shows it hovering around 1500 to 2000 ft. There are areas of VFR this evening, but conditions will worsen again overnight. A mix of IFR and MVFR ceilings with terrain obscurations are expected to remain the predominant conditions through Thursday evening for all locations.

MARINE. Updated 130 AM PST Thursday, 12 December 2019 . Active weather will continue through the weekend with periods of moderate to heavy rain. Winds will continue to diminish this morning, however, seas will remain elevated due to building steep long period west swell. Swell dominated seas of about 15-17 feet at 17 seconds will impact the coastal waters from Thursday morning into Friday evening, resulting in dangerous bar crossing conditions and hazardous surf zones. Seas gradually lower Saturday into Monday, but will remain steep due to ongoing swell. /BR-y

MFR WATCHES/WARNINGS/ADVISORIES. OR . High Surf Advisory from 4 AM Thursday to 7 PM PST Friday for ORZ021-022. Wind Advisory from 4 AM to 10 PM PST Thursday for ORZ031. Winter Weather Advisory from 4 PM Thursday to 4 PM PST Friday above 5000 feet in the for ORZ027.

CA . None.

Pacific Coastal Waters . Small Craft Advisory until 4 PM PST Saturday for PZZ350-356-370-376.

15/15/03


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CECC1 - 9419750 - Crescent City, CA 82 mi52 min SSE 12 G 14 54°F 52°F1019.8 hPa
46027 - ST GEORGES - 8NM West Northwest of Crescent City, CA 92 mi36 min SSE 7.8 G 12 53°F 54°F1020.6 hPa52°F

Wind History for Crescent City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Montague Siskiyou County Airport, CA9 mi23 minNNE 38.00 miLight Rain42°F39°F92%1021.6 hPa

Link to 5 minute data for KSIY

Wind History from SIY (wind in knots)
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Last 24hrNE6N7NE6NE4N6NE5NE7NE3N3NE5CalmN4N4E5N6NE5NW3NE4N3NE5NE5N4NE4N3
1 day agoS3CalmCalmNE7N7N7N9NE6CalmCalmCalmCalmNE3N5CalmNE3CalmCalmN3NE3NE5NE6N7N6
2 days agoCalmCalmW3NE3CalmCalmCalmSE4S5SE3SE4S5S5SE4SE7SE4S3CalmS6SE6S3CalmCalmCalm

Tide / Current Tables for Crescent City, California (2) (expired 1989-12-31)
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Crescent City
Click for Map
Thu -- 04:55 AM PST     3.24 feet Low Tide
Thu -- 07:34 AM PST     Sunrise
Thu -- 07:59 AM PST     Moonset
Thu -- 10:51 AM PST     7.92 feet High Tide
Thu -- 04:46 PM PST     Sunset
Thu -- 05:28 PM PST     Moonrise
Thu -- 05:59 PM PST     -0.92 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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65.754.13.53.23.64.45.66.87.77.97.46.24.42.50.7-0.5-0.9-0.50.62.23.85.1

Tide / Current Tables for Crescent City, California
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Crescent City
Click for Map
Thu -- 04:56 AM PST     3.25 feet Low Tide
Thu -- 07:34 AM PST     Sunrise
Thu -- 07:59 AM PST     Moonset
Thu -- 10:51 AM PST     7.90 feet High Tide
Thu -- 04:46 PM PST     Sunset
Thu -- 05:28 PM PST     Moonrise
Thu -- 05:59 PM PST     -0.90 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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65.754.23.53.23.64.45.66.87.67.97.46.24.42.50.7-0.5-0.9-0.50.62.23.85.1

Weather Map
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wmap_P
GEOS 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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Medford, OR (8,2,3,4)
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Ground Weather Radar Station Medford, OR
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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.