Tuesday, July7, 2020
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Marine Weather and Tides
Dillon Beach, CA

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
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.

Sunrise 5:53AMSunset 8:38PM Tuesday July 7, 2020 3:20 AM PDT (10:20 UTC) Moonrise 9:54PMMoonset 7:19AM Illumination 96% 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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PZZ540 Coastal Waters From Point Arena To Point Reyes California Out To 10 Nm- 236 Am Pdt Tue Jul 7 2020
.small craft advisory in effect through Wednesday afternoon...
Today..NW winds 20 to 30 kt with gusts up to 40 kt. Wind waves 8 to 9 ft. Mixed swell nw 4 to 5 ft at 10 seconds and S 2 to 3 ft at 14 seconds.
Tonight..NW winds 20 to 30 kt with gusts up to 40 kt. Wind waves 8 to 9 ft. NW swell 4 to 5 ft at 9 seconds and S around 2 ft at 14 seconds.
Wed..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 6 to 7 ft. NW swell 3 to 5 ft at 9 seconds and S around 2 ft at 15 seconds.
Wed night..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 7 to 8 ft. NW swell 4 to 5 ft at 9 seconds and S around 2 ft at 15 seconds.
Thu..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 6 to 7 ft. NW swell 4 to 5 ft at 9 seconds and S around 2 ft at 14 seconds.
Thu night..NW winds 20 to 25 kt with gusts up to 30 kt. Wind waves 7 to 8 ft. NW swell 4 to 6 ft at 8 seconds and S around 2 ft at 14 seconds.
Fri..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. NW swell 3 to 5 ft and S around 2 ft.
Sat..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. NW swell 4 to 6 ft and S around 2 ft.
PZZ500 236 Am Pdt Tue Jul 7 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A 1032 mb high is over the eastern pacific while a 1000 mb low is over western utah. Strong pressure gradients will produce strong and gusty northwest winds through Wednesday. The strongest winds will be off the big sur coast where gale force gusts are possible. These strong winds will generate steep fresh swell and hazardous seas conditions. Winds will diminish after Wednesday.


7 Day Forecast for Marine Location Near Dillon Beach, CA
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location: 38.25, -122.98     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 071016 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 316 AM PDT Tue Jul 7 2020

SYNOPSIS. Seasonably cool temperatures will continue today as an upper trough moves through the region. Temperatures are expected to be similar through midweek before warming late in the week and into next weekend as high pressure builds over the region.

DISCUSSION. as of 03:16 AM PDT Tuesday . Longwave pattern over the region continues to show a passing upper level trough. The passing trough is making for a complicated marine layer forecast this morning. One would think a passing trough may help to deepen the marine layer, but this morning is turning out to be different per recent satellite imagery. Latest satellite imagery shows a disorganized marine layer trying to form, but only patchy low clouds exist East Bay foothills, San Mateo Coastline, and portions of Monterey Bay. The lack of stratus development this morning is likely tied to a strong pressure gradient from N-S, which is currently nearly 6mb with gusty winds over the waters. Speaking of gusty winds, the onshore gradient is still near 3mb with gusts greater than 40 mph in the East Bay passes. For the rest of the morning, forecast has been updated to back off on cloud development, but keep gusty winds in place.

Unlike 24 hours ago, not seeing much in the way of heat signatures near the Crews Fire. Relative humidity greater than 80 percent, which is a good thing. Only item of concern is the lingering breezy wind with gusts up to 10 mph.

Generally speaking a few patchy low clouds possible this morning giving way to another day of sunny skies. Temperatures today will be seasonably cool with highs in the 60/70s coast and 80/90s interior.

The upper trough will continue to lift eastward over the next 24 hours as zonal flow develops aloft. Locally that will translate to a slight uptick in temperatures. A more noticeable warm up will occur later in the work week and into early next week as high pressure currently over the Desert Southwest builds into California. By Thursday, more widespread temperatures in the 90s are expected away from the coast. Far interior portions of the forecast area will have a shot at eclipsing 100 degrees. The warming trend will continue through early next week. Despite the warm up Heat Risk concerns will remain in the low to moderate category. Longer range models suggest the ridge of high pressure weakens the middle of next week as another trough approaches the West Coast.

AVIATION. As of 10:40 PM PDT Monday . For 06Z TAFS . Locally gusty west to northwest winds will continue to gradually diminish overnight. Patchy MVFR ceilings near the coast at 06Z will become more widespread overnight and spread inland early Tuesday morning as the marine layer deepens. However, not all Bay Area terminals are expected to be impacted. VFR conditions are forecast to develop at all terminals by 18Z Tuesday, except at KMRY where MFVR ceilings may persist longer. Onshore breezes tomorrow afternoon are not expected to be as strong as on Monday.

Vicinity of KSFO . VFR through most of the forecast period. West winds will gust near 30 kt through 09Z and then gradually diminish thereafter. Stratus will likely develop locally into SF Bay late Monday night and MVFR ceilings are possible at the terminal between about 11Z and 15Z, but confidence is low on this point. West winds will increase once again on Tuesday afternoon, but will not be as strong as on Monday.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . MVFR ceilings will become more widespread overnight and then persist until 18Z Tuesday. Also, areas of IFR ceilings possible starting at 09Z and continuing into Tuesday morning. Light to moderate westerly winds will prevail.

MARINE. as of 9:00 PM PDT Monday . Steep pressure gradients between strong high pressure well offshore and low pressure over the interior will continue to produce strong and gusty northwest winds across the coastal waters through Tuesday, especially over the near shore waters off the Big Sur coast where gales will likely continue. These strong northwest winds will also generate steep fresh swell and hazardous seas conditions. Winds will diminish later in the week.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pt Reyes to Pigeon Pt 0-10 nm SCA . Pigeon Pt to Pt Pinos 0-10 nm SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm GLW . Pt Pinos to Pt Piedras Blancas 0-10 nm SCA . Mry Bay from 11 AM



PUBLIC FORECAST: Diaz/Canepa AVIATION: Dykema MARINE: Dykema

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 17 mi31 min NW 23 G 29 52°F 49°F8 ft1014 hPa50°F
46214 - Point Reyes, CA (029) 34 mi55 min 53°F9 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 35 mi31 min NW 21 G 25 54°F 7 ft1014.7 hPa50°F
46237 - San Francisco Bar, CA (142) 37 mi51 min 53°F6 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 38 mi41 min Calm 58°F 1013 hPa
RCMC1 - 9414863 - Richmond, CA 38 mi51 min SE 1.9 G 8 58°F 65°F1013.5 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 40 mi51 min S 11 G 13 58°F 1014 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 40 mi51 min WSW 11 G 15 59°F 1013 hPa
FTPC1 - 9414290 - San Francisco, CA 41 mi51 min WSW 8 G 13 54°F 63°F1013.8 hPa
PXSC1 44 mi51 min 56°F 51°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 44 mi51 min SW 2.9 G 11 55°F 1012.7 hPa
OBXC1 46 mi51 min 58°F 53°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 46 mi51 min SW 5.1 G 7
OKXC1 - 9414776 - Oakland (Berth 34), CA 46 mi51 min W 1.9 G 4.1 57°F 1013.8 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 48 mi51 min SW 12 G 14 60°F 68°F1012.8 hPa
UPBC1 48 mi51 min WSW 12 G 17
LNDC1 49 mi51 min SSE 5.1 G 5.1 56°F 1013.8 hPa
AAMC1 - 9414750 - Alameda, CA 49 mi51 min W 6 G 8.9 56°F 70°F1014 hPa

Wind History for Point Reyes, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Santa Rosa, Santa Rosa Sonoma County Airport, CA20 mi28 minN 09.00 miFair52°F46°F80%1012.3 hPa
Petaluma Municipal Airport, CA20 mi26 minVar 44.00 miFog/Mist50°F50°F100%1013.5 hPa
Novato / Gnoss Field, CA24 mi26 minNE 610.00 miFair55°F48°F77%1013.2 hPa

Link to 5 minute data for KO69

Wind History from O69 (wind in knots)
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Last 24hrN3CalmN3CalmNW33W7W8
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W8CalmCalm454W5
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1 day agoNW4NW4NW4CalmCalm44W8W8W8W10W11W9SW9SW13W1256Calm--4--4NW3
2 days agoCalmCalmCalmCalmW3CalmCalm45W8W95SW106
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--CalmCalm

Tide / Current Tables for Tomales Bay entrance, California
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Tomales Bay Entrance
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Tue -- 12:46 AM PDT     5.49 feet High Tide
Tue -- 05:55 AM PDT     Sunrise
Tue -- 08:12 AM PDT     -1.10 feet Low Tide
Tue -- 08:19 AM PDT     Moonset
Tue -- 03:07 PM PDT     4.00 feet High Tide
Tue -- 07:54 PM PDT     2.53 feet Low Tide
Tue -- 08:37 PM PDT     Sunset
Tue -- 10:53 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.35.55.14.22.91.50.3-0.7-1.1-0.9-0.20.92.13.13.743.93.532.72.52.73.34

Tide / Current Tables for Point Reyes, California Current
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Point Reyes
Click for Map
Tue -- 01:39 AM PDT     -0.00 knots Slack
Tue -- 05:00 AM PDT     -1.54 knots Max Ebb
Tue -- 05:56 AM PDT     Sunrise
Tue -- 08:20 AM PDT     Moonset
Tue -- 08:59 AM PDT     0.00 knots Slack
Tue -- 12:04 PM PDT     1.19 knots Max Flood
Tue -- 03:26 PM PDT     -0.00 knots Slack
Tue -- 05:38 PM PDT     -0.70 knots Max Ebb
Tue -- 08:37 PM PDT     Sunset
Tue -- 08:53 PM PDT     0.00 knots Slack
Tue -- 10:53 PM PDT     Moonrise
Tue -- 11:38 PM PDT     0.77 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.3-0.2-0.8-1.4-1.5-1.4-1.1-0.600.611.21.10.80.3-0.3-0.6-0.7-0.5-0.300.40.7

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 San Francisco/Monterey Bay Area, CA (6,6,7,8)
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Ground Weather Radar Station Sacramento, CA
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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 numerous 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.