Thursday, January23, 2020
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Marine Weather and Tides
Half Moon Bay, 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 7:18AMSunset 5:24PM Thursday January 23, 2020 5:24 PM PST (01:24 UTC) Moonrise 6:36AMMoonset 4:24PM Illumination 1% Phase: Waning Crescent; Moon at 28 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- 200 Pm Pst Thu Jan 23 2020
.small craft advisory in effect from Friday morning through Saturday afternoon...
Tonight..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 5 to 7 ft at 13 seconds. SWell W 3 to 5 ft.
Fri..NW winds 5 to 10 kt. Wind waves 1 ft. W swell 6 to 8 ft at 13 seconds and W 5 to 7 ft at 21 seconds.
Fri night..NW winds up to 10 kt. Wind waves 1 ft. W swell 9 to 11 ft at 18 seconds. A slight chance of rain.
Sat..W winds around 5 kt. Wind waves 1 ft. W swell 8 to 10 ft at 16 seconds. A slight chance of rain.
Sat night..SW winds 5 to 10 kt. Wind waves 1 ft. W swell 7 to 9 ft at 15 seconds. Rain likely.
Sun..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 5 to 7 ft at 18 seconds. A chance of rain.
Sun night..NW winds 5 to 10 kt. Wind waves 1 ft. W swell 7 to 9 ft at 19 seconds.
Mon..NW winds up to 10 kt. Wind waves 1 ft. W swell 11 to 13 ft.
Tue..NW winds up to 10 kt. Wind waves 1 ft. W swell 9 to 11 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 5 to 8 ft with a dominant period of 12 seconds. Across the bar...seas 6 to 9 ft with a dominant period of 12 seconds. Maximum ebb current of 3.3 kt at 03:13 pm Thursday and 1.8 kt at 04:01 am Friday.
PZZ500 200 Pm Pst Thu Jan 23 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Generally light winds are forecast to prevail over the coastal waters this evening and overnight. The exception to this will be along the big sur coast where a coastal jet with northerly winds is forecast to develop. A long period west to northwest swell will move through the waters, peaking on Friday and Saturday. Winds will become southwest to west late Saturday and into Sunday as the next system approaches.


7 Day Forecast for Marine Location Near Half Moon Bay, CA
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location: 37.47, -122.48     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 232359 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 359 PM PST Thu Jan 23 2020

SYNOPSIS. Mainly dry weather conditions along with a gradual warming trend is expected through Friday. A weak storm system moving into Northern California will bring a chance of precipitation to the region this upcoming weekend.

DISCUSSION. as of 1:36 PM PST Thursday . Satellite imagery continues to show cirrus clouds streaming over Northern California. Current temperature trends are generally warmer than yesterday at this time, especially across the sunnier regions including Monterey and San Benito counties. Last hour both MRY and SNS reported 64 degrees, six degrees warmer than 24 hours ago. Expect some low clouds and fog to reform overnight in inland valleys, especially in the East Bay bordering the Central Valley as well as the usually foggy portions of the East Bay Valleys. Overnight lows will be in the 40s.

High pressure will continue to dominate the weather pattern over the next couple of days. The tail end of a weak system could bring some light showers to far northern Sonoma County late tonight, but not much precipitation is expected. The ridge will rebuild Friday into Saturday with Saturday being another mild day across the district.

Rain chances will return over the weekend as a weak trough moves across NorCal. Rain chances will begin across the North Bay late in the day Saturday then slowly move southward by Sunday with showers ending by afternoon. Forecast rainfall amounts will generally be a few hundredths to possibly three quarters of an inch in the North Bay. Daytime temperatures will range from the upper 50s to lower 60s.

By early next week a ridge will rebuild over the west coast shunting the storm track farther north resulting in a mostly dry forecast for our area. The tail end of a few storms may clip Northern California at times bringing slight chances of rain to the extreme northern part of the North Bay next week.

AVIATION. as of 4:00 PM PST Thursday . For 00Z TAFs. Mid to high clouds continue to stream overhead with VFR conditions this afternoon and evening. High clouds should act once again to limit fog development tonight. However patchy fog is once again likely across the North Bay. A weak boundary will shift into the Bay Area early on Friday morning and bring low cigs to the area. At this time expecting most sites to develop MVFR cigs between 12z and 16z Friday, bordering on IFR near the coast. A few light showers will be possible mainly across the Bay Area and North Bay on Friday morning. Conditions will gradually improve Friday afternoon with VFR expected. However SCT to BKN clouds with bases mainly 3000-5000 ft AGL will persist into the afternoon. Winds will remain light through the period.

Vicinity of KSFO . VFR conditions will prevail through the evening. Clouds bases will gradually lower overnight. Low clouds will begin to increase early Friday morning as a weak boundary approaches the coast. Borderline MVFR/IFR cigs developing on Friday morning around 15z. Some reduced visibility may be possible at times Friday morning but not expecting dense fog. Isolated light showers or mist will also be possible on Friday morning. Winds tonight will be light onshore, with a light northeast wind on Friday morning.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR conditions are forecast to prevail through tonight. Isolated patches of fog or mist may develop early Friday morning. Low clouds will increase on Friday morning but coverage will be less than the Bay Area terminals. As such, VFR conditions are forecast to prevail through though Friday. Winds tonight will be light from the southeast, becoming light onshore Friday afternoon.

MARINE. as of 2:00 PM PST Thursday . Generally light winds are forecast to prevail over the coastal waters this evening and overnight. The exception to this will be along the Big Sur coast where a coastal jet with northerly winds is forecast to develop. A long period west to northwest swell will move through the waters, peaking on Friday and Saturday. Winds will become southwest to west late Saturday and into Sunday as the next system approaches.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. SCA . Pt Arena to Pt Reyes 0-10 nm from 3 AM SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm from 3 AM SCA . Pt Arena to Pigeon Pt 10-60 nm from 3 AM SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm from 3 AM



PUBLIC FORECAST: Sims AVIATION: ST MARINE: Rowe

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 14 mi55 min 56°F 53°F1021 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 23 mi35 min N 3.9 G 3.9 55°F 55°F6 ft1020.7 hPa52°F
46237 - San Francisco Bar, CA (142) 23 mi55 min 53°F5 ft
AAMC1 - 9414750 - Alameda, CA 23 mi55 min 56°F 53°F1020.9 hPa
PXSC1 23 mi55 min 57°F 51°F
FTPC1 - 9414290 - San Francisco, CA 23 mi55 min 55°F 53°F1021 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 23 mi55 min 56°F 1020 hPa
OBXC1 24 mi55 min 55°F 52°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 24 mi73 min NW 7 G 8.9
OKXC1 - 9414776 - Oakland (Berth 34), CA 25 mi55 min 53°F 1020.9 hPa
LNDC1 25 mi55 min 57°F 1020.9 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 27 mi35 min N 3.9 G 3.9 55°F 54°F5 ft1020.9 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 29 mi38 min NW 6 54°F 1021 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 31 mi55 min 60°F 1021.2 hPa
RCMC1 - 9414863 - Richmond, CA 32 mi55 min 54°F 53°F1020.6 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 42 mi55 min 55°F 1020.8 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi55 min 54°F 51°F1021.2 hPa
UPBC1 44 mi67 min ENE 5.1 G 7
PRYC1 - 9415020 - Point Reyes, CA 45 mi55 min 53°F1020.5 hPa
PCOC1 - 9415144 - Port Chicago, CA 47 mi55 min 55°F 50°F1021 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA 48 mi35 min NW 7.8 G 12 55°F 55°F6 ft1020.7 hPa53°F

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hrW9W6W4N3CalmCalmCalmCalmCalmCalmCalmCalmCalmSE3SE4E3SE3E4NE3NE3CalmNE3N4N4
1 day agoSE6SE5SE4SE5SE6SE6E5N5N6NE3CalmN4CalmN3N3N5NE6NE5N3N4N6N7N4N5
2 days agoS7S5S7S6S8S7S9SE9SE7SE8SE9SE6SE6E6SE8E9S6S9S10
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Tide / Current Tables for Half Moon Bay, California
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Half Moon Bay
Click for Map
Thu -- 03:01 AM PST     2.93 feet Low Tide
Thu -- 06:36 AM PST     Moonrise
Thu -- 07:20 AM PST     Sunrise
Thu -- 08:49 AM PST     6.23 feet High Tide
Thu -- 03:59 PM PST     -0.83 feet Low Tide
Thu -- 04:24 PM PST     Moonset
Thu -- 05:23 PM PST     Sunset
Thu -- 11:00 PM PST     4.75 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.13.63.12.93.13.74.65.466.25.84.83.31.70.3-0.5-0.8-0.50.21.32.53.64.44.7

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
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San Mateo Bridge
Click for Map
Thu -- 12:44 AM PST     -0.00 knots Slack
Thu -- 03:26 AM PST     -0.81 knots Max Ebb
Thu -- 05:59 AM PST     0.00 knots Slack
Thu -- 06:35 AM PST     Moonrise
Thu -- 07:19 AM PST     Sunrise
Thu -- 08:40 AM PST     1.38 knots Max Flood
Thu -- 11:43 AM PST     -0.01 knots Slack
Thu -- 03:26 PM PST     -1.99 knots Max Ebb
Thu -- 04:22 PM PST     Moonset
Thu -- 05:22 PM PST     Sunset
Thu -- 06:58 PM PST     0.00 knots Slack
Thu -- 09:58 PM PST     1.96 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.6-0.2-0.6-0.8-0.8-0.500.81.31.41.10.6-0.2-1-1.6-2-1.9-1.6-0.901.11.821.8

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 (20,4,5,8)
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Ground Weather Radar Station San Francisco Bay Area, 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.