Sunday, July12, 2020
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Marine Weather and Tides
Pacifica, 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 5:57AMSunset 8:33PM Sunday July 12, 2020 12:28 PM PDT (19:28 UTC) Moonrise 12:00AMMoonset 12:13PM Illumination 51% Phase: Third Quarter Moon; Moon at 22 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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PZZ545 Coastal Waters From Point Reyes To Pigeon Point California Out To 10 Nm- 908 Am Pdt Sun Jul 12 2020
Today..NW winds 15 to 25 kt. Gusts up to 35 kt this afternoon. Wind waves 3 to 4 ft. NW swell 6 to 8 ft at 8 seconds. SWell S up to 2 ft.
Tonight..NW winds 20 to 30 kt with gusts up to 35 kt. Wind waves 4 to 5 ft. NW swell 6 to 8 ft at 8 seconds and S up to 2 ft at 14 seconds.
Mon..W winds 10 to 20 kt with gusts up to 25 kt. Wind waves 1 to 2 ft. NW swell 6 to 8 ft at 9 seconds and S up to 2 ft at 12 seconds.
Mon night..SW winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 4 to 6 ft at 9 seconds and S up to 2 ft at 11 seconds.
Tue..S winds 5 to 15 kt. Wind waves 2 to 3 ft. NW swell 3 to 5 ft at 9 seconds and S up to 2 ft at 10 seconds.
Tue night..S winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 3 to 5 ft at 9 seconds and S up to 2 ft at 10 seconds.
Wed..S winds up to 10 kt. Wind waves 1 ft. NW swell 3 to 5 ft and S up to 2 ft.
Thu..SW winds up to 10 kt. Wind waves 1 ft. NW swell 4 to 6 ft and S up to 2 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 4 to 5 ft with dominate swell period of 8 seconds. Across the bar...seas 6 to 8 ft with dominate swell period of 8 seconds. Maximum ebb current of 1.5 kt at 10:49 am Sunday and 1.6 kt at 11:43 pm Sunday.
PZZ500 908 Am Pdt Sun Jul 12 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Robust northerly gradient will bring moderate to locally gusty northwest winds across the coastal waters today and tomorrow. Northwest winds will generate steep fresh swell resulting in hazardous conditions for small craft vessels. A longer period south swell will mix with the steep fresh northwest swell. A nearly stationary and mainly dry low pressure trough will develop over the coastal waters Tuesday through Thursday resulting in southerly winds mainly over the inner and southern coastal waters.


7 Day Forecast for Marine Location Near Pacifica, CA
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location: 37.62, -122.51     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 121737 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1037 AM PDT Sun Jul 12 2020

SYNOPSIS. Hot and dry conditions will persist across the interior today while cooler temperatures are expected near the coast. Interior cooling is then likely early in the week as onshore flow increases and high pressure weakens.

DISCUSSION. as of 09:03 AM PDT Sunday . Faint eddy was visible this morning over Monterey Bay, keeping coastal Santa Cruz under a fog/low-cloud deck that will taper off as the morning progresses. Low clouds are also visible off the coast of southern Marin County and the San Francisco Peninsula and are expected to dissipate later this morning as well, while the Monterey Peninsula has already started clearing out. Expect mostly clear skies over the entire CWA today as marine layer compression will continue through the rest of the day.

While mins along the coast were relatively cool (e.g. mid 40s to low 50s in coastal Monterey County),the story was very different across the interior, where poor temperature and moderately poor humidity recoveries were observed over high- terrain locations. 7am temperatures over far interior East Bay locations such as Livermore and the East Hills were well into the 70s and even low 80s, with similar temp ranges observed in high- terrain locations up in the North Bay, Marin County, and southern Monterey County.

One of today's primary concern will be the heat over the interior. The 598dm 500mb upper-level ridge currently sits over the southwest, where places from Phoenix to Palm Springs are expected to reach temps in the 110s. The good news is we will not be reaching those kinds of temps over our CWA but the ridge's influence will lead to mid- 90s and low 100s over interior locations, with San Benito,Santa Clara, Napa, and Sonoma counties likely to host our hottest conditions today. Models are suggesting max temps of up to 105 in extreme northern Napa and southern Monterey counties. Those who plan to take part in recreational activities in places like Bothe-Napa Valley State Park to our north and Pinnacles National Park to our south should be mindful of these conditions.

Fire weather conditions will also be a concern today, as we have already seen from the hot, dry conditions in the interior that set off the Echo Knolls fire yesterday. Low to moderate RH values were observed this morning across several interior locations that include the East Hills where the fire broke out yesterday. Thankfully, weak onshore flow has been observed throughout this entire upper- level ridge setup, which has helped to mitigate fire weather concerns. That being said, both heat and fire concerns will persist through the rest of the day, with the former being the focal point for several interior locations today.

PREV DISCUSSION. as of 02:52 AM PDT Sunday .

The upper level ridge is then forecast to weaken early in the upcoming weekend in response to a mid/upper level trough approaching the Pacific Northwest. This will bring about a 5-10 deg F cooling to the interior on Monday as onshore flow increases. As troughing to the north becomes the dominate weather feature by midweek, look for southerly flow to develop and bring additional cooling to places such as Santa Cruz, the North Bay Valleys and Big Sur Coast. Generally speaking, temperatures are likely to be near seasonal averages for much of the week. Additionally, the marine layer will likely become better established resulting in more widespread night/morning low clouds.

AVIATION. as of 10:40 AM PDT Sunday . for 18z TAFs. Widespread VFR through the daylight hours today with a robust northerly gradient offshore and high pressure overhead suppressing the marine layer. Onshore gradient strengthens into the afternoon with warming inland allowing for breezy to locally gusty (strongest through coastal gaps) onshore winds to prevail this afternoon and evening. Marine layer anticipated to redevelop into the evening offshore before attempting to intrude inland overnight. Intrusion will not be deep but will bring borderline MVFR/IFR cigs to the coastally influenced TAF sites through the predawn to early morning hours. Breezy onshore winds redevelop tomorrow afternoon.

Vicinity of KSFO . VFR, west to northwest wind near 10 knots then increasing to 20 to near 30 knots in the afternoon to mid evening. A stratus intrusion is probable tonight and Monday morning then low to moderate forecast confidence OVC IFR ceiling until 17z-18z.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR today. West winds increasing to 10 to 15 knots in the afternoon and early evening. West to northwest winds in the evening resulting in IFR ceilings developing late to overnight.

MARINE. as of 10:32 AM PDT Sunday . Robust northerly gradient will bring moderate to locally gusty northwest winds across the coastal waters today and tomorrow. Northwest winds will generate steep fresh swell resulting in hazardous conditions for small craft vessels. A longer period south swell will mix with the steep fresh northwest swell. A nearly stationary and mainly dry low pressure trough will develop over the coastal waters Tuesday through Thursday resulting in southerly winds mainly over the inner and southern coastal waters.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. 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 . Pt Pinos to Pt Piedras Blancas 0-10 nm SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm



PUBLIC FORECAST: Diaz/MM AVIATION: DRP MARINE: DRP

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46237 - San Francisco Bar, CA (142) 13 mi59 min 60°F4 ft
FTPC1 - 9414290 - San Francisco, CA 13 mi59 min W 8 G 16 58°F 63°F1014.4 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 14 mi59 min WSW 4.1 G 8 69°F 1012.9 hPa
PXSC1 14 mi59 min 67°F 53°F
AAMC1 - 9414750 - Alameda, CA 15 mi59 min WSW 4.1 G 6 65°F 70°F1013.9 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 16 mi59 min W 5.1 G 6
OBXC1 16 mi59 min 64°F 57°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi59 min WNW 9.9 G 11 61°F 1013.9 hPa
LNDC1 17 mi59 min WSW 4.1 G 6 67°F 1013.8 hPa
RTYC1 - 9414523 - Redwood City, CA 18 mi59 min NW 4.1 G 5.1 69°F 74°F1014.1 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 19 mi43 min SSE 8 67°F 1014 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 20 mi39 min NW 9.7 G 12 54°F 5 ft1015 hPa51°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA 21 mi59 min SSW 9.9 G 15 61°F 1014.2 hPa
RCMC1 - 9414863 - Richmond, CA 22 mi59 min S 5.1 G 7 65°F 64°F1013.5 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 27 mi39 min NW 12 G 16 55°F 7 ft1015.6 hPa53°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 33 mi59 min W 4.1 G 5.1 72°F 1013 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 35 mi59 min NW 15 G 17 76°F 70°F1012.5 hPa
UPBC1 35 mi59 min NW 13 G 16
PCOC1 - 9415144 - Port Chicago, CA 39 mi59 min W 8 G 9.9 76°F 71°F1012.3 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 44 mi59 min NW 8.9 G 12 79°F 1012.1 hPa
SFXC1 - San Francisco Bay Reserve, CA 48 mi104 min WNW 6

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA8 mi33 minNW 1010.00 miFair73°F52°F48%1013.1 hPa
Half Moon Bay Airport, CA8 mi34 minWNW 75.00 miFair with Haze59°F51°F77%1014.9 hPa
San Carlos Airport, CA15 mi42 minN 710.00 miClear72°F59°F65%1013.5 hPa
Oakland, Metro Oakland International Airport, CA16 mi36 minW 810.00 miFair74°F54°F50%1013.4 hPa
Hayward, Hayward Air Terminal, CA21 mi35 minW 710.00 miFair77°F54°F45%1014 hPa
Palo Alto Airport, CA23 mi42 minN 610.00 miClear73°F59°F61%1013.2 hPa

Link to 5 minute data for KHAF

Wind History from HAF (wind in knots)
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NW9NW8NW5CalmCalmCalmCalmCalmCalmCalmNE3NE3CalmCalmW5W6W7W6
1 day agoNW8NW8W8NW8NW8NW7NW7W4CalmCalmCalmE3CalmCalmCalmCalmCalmCalmCalmCalmW6NW8W8NW10
2 days agoW5NW10NW12NW12NW10NW11
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Tide / Current Tables for Seaplane Harbor, San Francisco Bay, California
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Seaplane Harbor
Click for Map
Sun -- 12:42 AM PDT     Moonrise
Sun -- 12:59 AM PDT     2.34 feet Low Tide
Sun -- 05:57 AM PDT     5.37 feet High Tide
Sun -- 05:58 AM PDT     Sunrise
Sun -- 12:25 PM PDT     1.28 feet Low Tide
Sun -- 01:13 PM PDT     Moonset
Sun -- 04:31 PM PDT     Last Quarter
Sun -- 07:07 PM PDT     6.64 feet High Tide
Sun -- 08:31 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.52.32.63.44.35.15.45.14.53.62.61.81.31.4234.25.46.36.66.45.84.83.7

Tide / Current Tables for Sierra Point 1.3 mi ENE, South San Francisco Bay, California Current
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Sierra Point 1.3 mi ENE
Click for Map
Sun -- 12:42 AM PDT     Moonrise
Sun -- 12:56 AM PDT     0.00 knots Slack
Sun -- 03:34 AM PDT     0.46 knots Max Flood
Sun -- 05:58 AM PDT     Sunrise
Sun -- 06:30 AM PDT     -0.00 knots Slack
Sun -- 09:31 AM PDT     -0.74 knots Max Ebb
Sun -- 12:47 PM PDT     0.00 knots Slack
Sun -- 01:13 PM PDT     Moonset
Sun -- 03:59 PM PDT     0.68 knots Max Flood
Sun -- 04:31 PM PDT     Last Quarter
Sun -- 07:19 PM PDT     -0.00 knots Slack
Sun -- 08:31 PM PDT     Sunset
Sun -- 10:17 PM PDT     -0.76 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.300.30.40.50.30.1-0.2-0.5-0.7-0.7-0.5-0.20.10.40.60.70.60.40.1-0.3-0.6-0.8-0.7

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (15,3,4,5)
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Ground Weather Radar Station San Francisco Bay Area, CA
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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 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.