Sunday, December8, 2019
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Marine Weather and Tides
Half Moon Bay, 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 7:10AMSunset 4:52PM Sunday December 8, 2019 9:54 AM PST (17:54 UTC) Moonrise 2:59PMMoonset 3:32AM Illumination 89% Phase: Waxing Gibbous; Moon at 12 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- 838 Am Pst Sun Dec 8 2019
Today..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 6 to 8 ft at 11 seconds. A chance of rain this morning.
Tonight..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 4 to 6 ft at 11 seconds.
Mon..SW winds up to 10 kt. Wind waves 1 ft. W swell 4 to 6 ft at 15 seconds.
Mon night..NW winds around 5 kt. Wind waves 1 ft. W swell 4 to 6 ft at 15 seconds and sw around 2 ft at 16 seconds.
Tue..E winds up to 10 kt. Wind waves 1 ft. W swell 3 to 5 ft at 15 seconds and sw around 2 ft at 16 seconds. A slight chance of rain.
Tue night..NE winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 5 to 7 ft at 15 seconds and S around 2 ft at 15 seconds.
Wed..E winds up to 10 kt. Wind waves 1 ft. W swell 6 to 8 ft and S around 2 ft.
Thu..N winds around 5 kt. Wind waves 1 ft. W swell 9 to 11 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 10 to 13 ft with a dominant period of 9 seconds. Across the bar...seas 11 to 15 ft with a dominant period of 9 seconds. Maximum ebb current of 2.8 kt at 01:43 pm Sunday and 1.3 kt at 01:55 am Monday.
PZZ500 838 Am Pst Sun Dec 8 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Scattered showers are seen this morning and expected to continue into the afternoon. Winds shift to the northwest by this afternoon and continue to weaken. Building high pressure will keep winds generally light to moderate through much of the week . A weak system will move through Tuesday night bringing back southerly winds to the waters along with the return of rain showers. Wind waves continue to ease as the winds diminish. A moderate west swell will continue through today before a northwest swell arrives on Monday and gradually builds throughout the coming week.


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 081642 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 842 AM PST Sun Dec 8 2019

SYNOPSIS. Scattered showers will continue into this morning, ending from north to south on during the afternoon. Dry conditions are then forecast for most of next week, except for light rain chances late Tuesday and Tuesday night and then again late in the week. Temperatures will be near seasonal averages through next week.

DISCUSSION. as of 8:42 AM PST Sunday . Scattered rain showers continue to impact parts of the San Francisco Bay Area and central California coast this Sunday morning. As of 8:30 AM PST, KMUX radar shows a line of showers approaching the Monterey Bay shoreline from the west as well as another line along the Big Sur Coast. In the Bay Area, several showers are bringing light to briefly moderate rainfall to parts of San Mateo, Santa Clara, and Alameda Counties. The latest HRRR and 3-km NAM suggest shower activity will begin to decrease from north to south during the afternoon hours as the upper level low and associated trough axis drops southeastward into southern California. Looks like Monday will be a good day to leave the umbrella at home as an upper level ridge begins to develop over the West Coast. No major changes have been made this morning to the short-term grids. For additional forecast details, please refer to the previous discussion section.

PREV DISCUSSION. As of 2:41 AM PST Sunday . KMUX radar scans continue to show scattered showers moving across the area, although they are decreasing in intensity and coverage. Hourly precip totals are mainly in the Santa Clara County and East Bay, where up to 0.12" have fallen. This shower activity will continue to diminish today, although the coastal mountains in Monterey and Santa Cruz county could see over a half inch of rain today in passing showers.

Dry weather is expected beginning on Monday as an upper level ridge builds back in over California. A weak trough is forecast to move across Northern California late Tuesday into Wednesday. Light rain could reach as far south as the Monterey Bay by Wednesday morning, but rain chances will be greatest the farther north you go. Another system moving across by next weekend could bring another shot of rain, but again this system looks to impact mainly far northern California. Otherwise, seasonably mild temperatures are expected.

AVIATION. as of 03:34 AM PST Sunday . For 12z tafs. MVFR conditions prevailing with occasionally reduced vis/cigs to IFR during passing heavier showers. Current observations show cigs between 2,000 and 5,000 ft AGL. BKN cigs expected to lift this afternoon, but SCT lower clouds may persist. Guidance shows low clouds re-developing again this evening. Showers will continue this morning before tapering off this afternoon and evening. Generally light winds this morning becoming onshore 10-15 kt this afternoon.

Vicinity of KSFO . MVFR conditions with passing showers. Cigs expected to lift this afternoon, but SCT lower clouds may continue into this evening. Lowering cigs forecast to return overnight. S/SW winds this morning shifting W late this morning/early this afternoon.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR-MVFR conditions with showers. Cigs/vis may temporarily lower during heavier showers this morning before tapering off this afternoon/evening. Lowering cigs again this evening and overnight. Southerly winds this morning shifting to the W/NW by this afternoon.

MARINE. as of 8:38 AM PST Sunday . Scattered showers are seen this morning and expected to continue into the afternoon. Winds shift to the northwest by this afternoon and continue to weaken. Building high pressure will keep winds generally light to moderate through much of the week. A weak system will move through Tuesday night bringing back southerly winds to the waters along with the return of rain showers. Wind waves continue to ease as the winds diminish. A moderate west swell will continue through today before a northwest swell arrives on Monday and gradually builds throughout the coming week.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. None.

PUBLIC FORECAST: Rowe/Sims AVIATION: AS MARINE: DK

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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 S 4.1 G 5.1 55°F 56°F1017 hPa (+1.4)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 23 mi35 min WNW 5.8 G 9.7 56°F 56°F1016.9 hPa53°F
FTPC1 - 9414290 - San Francisco, CA 23 mi55 min SW 2.9 G 6 54°F 54°F1016.6 hPa (+1.5)
46237 - San Francisco Bar, CA (142) 23 mi55 min 55°F7 ft
AAMC1 - 9414750 - Alameda, CA 23 mi55 min W 4.1 G 5.1
PXOC1 - 9414311 - San Francisco (Pier 1), CA 23 mi55 min W 1 G 4.1 54°F 1015.5 hPa (+1.7)
OBXC1 24 mi55 min 54°F 54°F
LNDC1 25 mi55 min WSW 4.1 G 4.1 55°F 1016.5 hPa (+1.6)
OKXC1 - 9414776 - Oakland (Berth 34), CA 25 mi55 min WNW 2.9 G 5.1 54°F 1016.6 hPa (+1.7)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 27 mi35 min WSW 5.8 G 9.7 56°F 56°F1016.9 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 29 mi38 min Calm 55°F 1017 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 31 mi55 min SSW 4.1 G 6 55°F 1016.6 hPa (+1.5)
RCMC1 - 9414863 - Richmond, CA 32 mi55 min S 1.9 G 2.9 54°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 42 mi55 min W 4.1 G 4.1 55°F 1016 hPa (+1.5)
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi55 min Calm G 1.9 54°F 54°F1016.4 hPa (+1.5)
UPBC1 44 mi55 min NW 1.9 G 2.9
PRYC1 - 9415020 - Point Reyes, CA 45 mi55 min 54°F1015.8 hPa (+1.5)
PCOC1 - 9415144 - Port Chicago, CA 47 mi55 min Calm G 1.9 55°F 53°F1016.1 hPa (+1.5)
46042 - MONTEREY - 27NM West of Monterey Bay, CA 48 mi35 min NW 5.8 G 7.8 56°F 57°F1017.2 hPa54°F

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA3 mi60 minN 01.25 miFog/Mist54°F53°F100%1016.6 hPa
San Francisco, San Francisco International Airport, CA12 mi2 hrsW 48.00 miOvercast57°F52°F83%1015.8 hPa
San Carlos Airport, CA13 mi68 minN 010.00 miMostly Cloudy55°F55°F100%1016.6 hPa
Palo Alto Airport, CA19 mi68 minN 08.00 miFog/Mist55°F51°F88%1016.6 hPa
Oakland, Metro Oakland International Airport, CA21 mi62 minW 310.00 miOvercast56°F54°F93%1016.6 hPa
Hayward, Hayward Air Terminal, CA23 mi61 minN 010.00 miOvercast56°F55°F97%1017.3 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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2 days agoE5NE3NE5CalmCalmSW3CalmN9N7N5N4CalmCalmCalmE6CalmNE3SE3CalmCalmCalmCalmSE7E11
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Tide / Current Tables for Half Moon Bay, California
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Half Moon Bay
Click for Map
Sun -- 01:12 AM PST     1.89 feet Low Tide
Sun -- 03:31 AM PST     Moonset
Sun -- 07:11 AM PST     Sunrise
Sun -- 07:28 AM PST     5.51 feet High Tide
Sun -- 02:26 PM PST     0.51 feet Low Tide
Sun -- 02:58 PM PST     Moonrise
Sun -- 04:51 PM PST     Sunset
Sun -- 08:46 PM PST     3.96 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.11.922.63.44.255.55.454.12.91.810.60.611.72.63.33.843.73.2

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
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San Mateo Bridge
Click for Map
Sun -- 01:18 AM PST     -0.94 knots Max Ebb
Sun -- 03:30 AM PST     Moonset
Sun -- 04:21 AM PST     0.00 knots Slack
Sun -- 07:06 AM PST     1.34 knots Max Flood
Sun -- 07:11 AM PST     Sunrise
Sun -- 10:23 AM PST     -0.01 knots Slack
Sun -- 01:45 PM PST     -1.53 knots Max Ebb
Sun -- 02:57 PM PST     Moonrise
Sun -- 04:50 PM PST     Sunset
Sun -- 05:18 PM PST     0.00 knots Slack
Sun -- 08:03 PM PST     1.44 knots Max Flood
Sun -- 11:25 PM PST     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.7-0.9-0.9-0.6-0.20.51.11.31.20.90.3-0.4-1.1-1.4-1.5-1.3-0.9-0.20.61.21.41.310.3

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 (12,3,4,5)
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Ground Weather Radar Station San Francisco Bay Area, CA
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