Thursday, November15, 2018 L-36.com


Marine Weather and Tides
Half Moon Bay, CA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:49AMSunset 4:59PM Thursday November 15, 2018 7:40 PM PST (03:40 UTC) Moonrise 1:16PMMoonset 12:00AM Illumination 56% Phase: First Quarter Moon; Moon at 8 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- 301 Pm Pst Thu Nov 15 2018
Rest of today..NW winds 5 to 15 kt. Wind waves 2 ft or less. W swell 5 to 7 ft at 16 seconds and S around 2 ft at 14 seconds. Hazy and patchy smoke.
Tonight..NW winds 5 to 15 kt. Wind waves 2 ft or less. W swell 5 to 8 ft at 15 seconds and S around 2 ft at 14 seconds. Hazy and patchy smoke.
Fri..NW winds up to 10 kt. Wind waves 2 ft or less. W swell 4 to 7 ft at 14 seconds and S around 2 ft at 14 seconds. Hazy and patchy smoke.
Fri night..W winds up to 10 kt. Wind waves 2 ft or less. W swell 3 to 6 ft at 13 seconds and S around 2 ft at 16 seconds. Hazy and patchy smoke.
Sat..W winds around 5 kt. Wind waves 2 ft or less. W swell 3 to 5 ft at 15 seconds and sw around 2 ft at 16 seconds. Hazy and patchy smoke.
Sat night..NW winds 5 to 10 kt. Wind waves 2 ft or less. W swell 3 to 5 ft at 16 seconds and S around 2 ft at 15 seconds.
Sun..NW winds up to 10 kt. Wind waves 2 ft or less. W swell 3 to 5 ft and S around 2 ft.
Mon..SE winds around 5 kt. Wind waves 2 ft or less. W swell 2 to 4 ft and S around 2 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 3 to 6 ft with a dominant period of 14 seconds. Across the bar...combined seas 4 to 7 ft with a dominant period of 14 seconds. Maximum ebb current of 1.4 knots at 10:07 pm Thursday and 1.4 knots at 11:43 am Friday.
PZZ500 301 Pm Pst Thu Nov 15 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... North to northwest winds will prevail over the coastal waters through the end of the week and into the coming weekend. Expect locally breezy winds near coastal gaps and favored coastal jet locations during the afternoon and evening hours. Mixed swell with a moderate northwest swell and light southerly swell.


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 152331
afdmtr
area forecast discussion
national weather service san francisco bay area
331 pm pst Thu nov 15 2018

Synopsis Smoke and haze will continue to produce poor air
quality over much of the san francisco bay through the weekend.

Dry and mild conditions are also likely to persist through early
next week. A more significant pattern change appears likely
during the latter half of next week with the potential for
widespread rainfall.

Discussion As of 1:58 pm pst Thursday... Smoke from the camp
fire continues to be the main impact across the district, but
especially around the greater san francisco bay area where
visibilities continue to fluctuate between 1 mile and 3 miles.

These conditions are resulting in poor air quality with no
significant improvement forecast through the weekend as a weak
windflow pattern persists.

Minor day-to-day changes are expected through the upcoming
weekend with daytime temperatures in the 60s and 70s with
overnight lows in the middle 30s across the colder inland
locations to middle 40s near the coast bays. Very dry conditions
will also persist, even near the coast through the weekend. Weak
offshore flow will continue to spread smoke over the region until
the large scale pattern aloft changes. Right now, this much-
needed pattern change isn't expected to occur until the middle of
next week, at the earliest. Latest runs of the medium range models
continue to indicate a more likely chance of measurable rain for
the area. The 12z ECMWF maintains its trend of bringing a weak
frontal system across much of the area on Wednesday, followed by
a stronger front on Friday, with residual showers extending into
Saturday. The 12z GFS holds off the first system until
thanksgiving, followed by another system on Friday. The rainfall,
along with stronger onshore flow, is expected to help clear out
the smoke from the area.

Aviation As of 03:31 pm pst Thursday... For 00z tafs. Widespread
smoke continues to impact the region, particularly around the sf
bay area terminals. Most sites are now at MVFR ifr conditions due
to reduced vis. Do not expect much if any improvement in smoke
through the period. MVFR ifr vis will continue through the period
with occasional MVFR cigs. Slant range vis issues will also
persist and impact arrivals. Smoke impacts may remain an issue
until the next storm system, which right now looks like late next
week. Generally light winds through the period.

Vicinity of ksfo... MVFR ifr vis with MVFR CIGS due to wildfire
smoke. Winds will remain light.

Sfo bridge approach... Similar to terminal.

Monterey bay terminals... Conditions have worsened to MVFR with
kmry currently at 4 mile vis. Latest hrrr smoke forecast does not
suggest much improvement. Expect MVFR vis through much of the
period with occasions ofVFR. Onshore winds will continue into
the early evening before turning southerly.

Marine As of 03:01 pm pst Thursday... North to northwest winds
will prevail over the coastal waters through the end of the week
and into the coming weekend. Expect locally breezy winds near
coastal gaps and favored coastal jet locations during the
afternoon and evening hours. Mixed swell with a moderate northwest
swell and light southerly swell.

Mtr watches warnings advisories
Tngt None.

Public forecast: sims
aviation: as
marine: drp
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 14 mi41 min S 1 G 1 55°F 59°F1018.5 hPa (+0.0)
FTPC1 - 9414290 - San Francisco, CA 23 mi41 min Calm G 4.1 59°F 56°F1018.4 hPa (+0.0)
PXOC1 - 9414311 - San Francisco (Pier 1), CA 23 mi41 min W 5.1 G 7 59°F 1017.3 hPa (+0.0)
PXSC1 23 mi41 min 60°F 36°F
AAMC1 - 9414750 - Alameda, CA 23 mi41 min NNW 2.9 G 5.1 58°F1018.4 hPa (+0.0)
46237 - San Francisco Bar, CA (142) 23 mi41 min 56°F5 ft
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 24 mi41 min NW 7 G 8.9
OBXC1 24 mi41 min 58°F 42°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 25 mi41 min NW 8.9 G 9.9 58°F 1018.2 hPa (+0.0)
LNDC1 25 mi41 min NNW 4.1 G 6 58°F 1018.1 hPa (+0.0)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 27 mi31 min NW 9.7 G 12 55°F 57°F1018.5 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 29 mi36 min NW 6 57°F 1018 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 31 mi41 min N 7 G 8.9 58°F 1018.5 hPa (+0.0)
RCMC1 - 9414863 - Richmond, CA 32 mi41 min NNW 8 G 8.9 58°F 57°F1017.8 hPa (+0.0)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 42 mi41 min E 6 G 6 56°F 1018.2 hPa (+0.0)
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi41 min SSE 1.9 G 1.9 52°F 58°F1018.7 hPa (+0.0)42°F
PRYC1 - 9415020 - Point Reyes, CA 45 mi41 min WNW 8.9 G 11 55°F1017.9 hPa (-0.5)
PCOC1 - 9415144 - Port Chicago, CA 47 mi41 min NE 4.1 G 4.1 55°F 58°F1018.7 hPa (+0.0)
46042 - MONTEREY - 27NM West of Monterey Bay, CA 48 mi51 min NNW 16 G 18 59°F 61°F7 ft1016.6 hPa (-0.3)

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA3 mi46 minN 03.00 miOvercast with Haze46°F37°F71%1018.3 hPa
San Francisco, San Francisco International Airport, CA12 mi45 minN 01.50 miSmoke56°F34°F44%1017.8 hPa
San Carlos Airport, CA13 mi4.8 hrsVar 31.75 miSmoke Haze61°F44°F55%1018.6 hPa
Palo Alto Airport, CA19 mi54 minN 01.50 miHaze Smoke48°F41°F76%1018.6 hPa
Oakland, Metro Oakland International Airport, CA21 mi48 minN 01.75 miMostly Cloudy with Haze51°F39°F64%1018.5 hPa
Mountain View, Moffett Field, CA23 mi45 minN 02.00 miSmoke54°F43°F67%1018.6 hPa
Hayward, Hayward Air Terminal, CA23 mi47 minNE 31.50 miHaze Smoke55°F39°F55%1019.1 hPa

Wind History from SFO (wind in knots)
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Last 24hrS4CalmS3CalmS4CalmSW4SW4SW3CalmSW3CalmS4S3CalmNE3CalmCalmN4CalmE3E3S3Calm
1 day agoS3CalmCalmSE5CalmCalmSW6W4CalmCalmS3S3E3S3CalmE4NE4N5N4CalmCalmNW6W8W4
2 days agoCalmCalmCalmCalmCalmCalmSW3CalmSW3CalmSW3CalmCalmS3CalmCalmCalmCalmN3NE3CalmCalmCalmS3

Tide / Current Tables for Half Moon Bay, California
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Half Moon Bay
Click for Map
Thu -- 05:16 AM PST     4.43 feet High Tide
Thu -- 06:49 AM PST     Sunrise
Thu -- 06:54 AM PST     First Quarter
Thu -- 11:05 AM PST     2.96 feet Low Tide
Thu -- 01:15 PM PST     Moonrise
Thu -- 03:45 PM PST     4.03 feet High Tide
Thu -- 04:59 PM PST     Sunset
Thu -- 10:43 PM PST     0.78 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.42.12.93.74.24.44.44.13.73.43.133.13.33.7443.83.32.61.91.30.90.8

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
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San Mateo Bridge
Click for Map
Thu -- 01:02 AM PST     0.00 knots Slack
Thu -- 04:03 AM PST     1.33 knots Max Flood
Thu -- 06:48 AM PST     Sunrise
Thu -- 06:54 AM PST     First Quarter
Thu -- 07:42 AM PST     -0.00 knots Slack
Thu -- 10:17 AM PST     -0.72 knots Max Ebb
Thu -- 01:14 PM PST     Moonrise
Thu -- 01:46 PM PST     0.00 knots Slack
Thu -- 03:57 PM PST     0.69 knots Max Flood
Thu -- 04:57 PM PST     Sunset
Thu -- 06:56 PM PST     -0.00 knots Slack
Thu -- 10:20 PM PST     -1.20 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.5-00.71.21.31.310.5-0.1-0.5-0.7-0.7-0.5-0.30.10.50.70.60.4-0-0.5-0.9-1.2-1.1

Weather Map and Satellite Images
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GOES 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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Wind Forecast for San Francisco/Monterey Bay Area, CA (22,6,7,8)
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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 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.