Tuesday, October22, 2019 L-36.com


Marine Weather and Tides
Millbrae, 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 7:23AMSunset 6:24PM Tuesday October 22, 2019 7:40 AM PDT (14:40 UTC) Moonrise 12:00AMMoonset 2:27PM Illumination 35% Phase: Waning Crescent; Moon at 24 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- 252 Am Pdt Tue Oct 22 2019
Today..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 5 to 7 ft at 12 seconds and sw around 2 ft at 16 seconds.
Tonight..NW winds 5 to 15 kt. Wind waves 3 to 4 ft. NW swell 4 to 6 ft at 12 seconds and sw around 2 ft at 15 seconds.
Wed..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. NW swell 5 to 7 ft at 11 seconds and S around 2 ft at 15 seconds.
Wed night..N winds 5 to 15 kt. Wind waves 4 to 5 ft. NW swell 4 to 6 ft at 11 seconds and S around 2 ft at 14 seconds.
Thu..E winds 10 to 20 kt with gusts up to 25 kt. Wind waves 4 to 5 ft. NW swell 3 to 5 ft at 10 seconds and S around 2 ft at 14 seconds.
Thu night..NE winds 5 to 15 kt. Wind waves 1 to 2 ft. Mixed swell nw 2 to 4 ft at 9 seconds and S around 2 ft at 14 seconds.
Fri..N winds up to 10 kt. Wind waves 1 to 2 ft. Mixed swell nw 2 to 4 ft and S around 2 ft.
Sat..NW winds 5 to 15 kt. Wind waves 2 to 3 ft. NW swell 3 to 5 ft and S around 2 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 5 to 7 ft with a dominant period of 12 seconds. Across the bar...seas 6 to 8 ft with a dominant period of 12 seconds. Maximum ebb current of 1.4 kt at 12:43 pm Tuesday and 2.3 kt at 12:01 am Wednesday.
PZZ500 252 Am Pdt Tue Oct 22 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure ridging over the pacific northwest will produce moderate northerly winds across the coastal waters through midweek. Strongest winds are expected across the northern outer waters. As high pressure builds in over the great basin during the second half of the week, a thermal trough will develop along the coast. This will result in light offshore flow across the coastal waters. A moderate northwest swell will continue through midweek.


7 Day Forecast for Marine Location Near Millbrae, CA
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location: 37.58, -122.39     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 221145
afdmtr
area forecast discussion
national weather service san francisco bay area
445 am pdt Tue oct 22 2019

Synopsis A warming and drying trend will continue through
the week as high pressure strengthens over california. Offshore
flow will continue through midweek and strengthen Wednesday night
into Thursday morning. This will result in warm temperatures
reaching all the way to the coast, with the warmest temperatures
expected on Thursday. Locally gusty offshore winds are likely at
times in the hills, especially in the north bay hills on Wednesday
night. In the longer range, cooling is forecast during the
upcoming weekend, although another round of dry offshore winds
is possible by late in the weekend and into early next week.

Discussion As of 04:05 am pdt Tuesday... The overall impacts
message over the next few days has not changed much with this
forecast update. Simply put, ridge of high pressure will bring a
warming and drying trend to the region, but most importantly
elevate fire weather concerns to critical levels with gusty
offshore flow.

Current longwave pattern at 500mb shows a solid ridge of high
pressure anchored over the epac. The ridge is still on track to
gradually build and drift eastward over the next two days. At the
surface, high pressure will also build across the pacnw and
eventually the great basin. This pattern began to take shape on
Monday with temperatures well above normal for this time of year.

Temperatures were so warm that a few stations set daily record
maximum temperatures for oct 21. Additionally, the sfo-wmc did
briefly ramp up to 8.4 mb, which led to gusty winds in the
hills early Monday night. Mt saint helena maxed out at close to
50 mph. Winds have diminished slightly, but still remain breezy to
gusty in the hills. It also GOES with out saying, these stronger
ne winds area rather dry with relative humidity in the 30-40%
range. These conditions are only setting the stage for a more
critical timeframe Wednesday night with stronger winds and lower
relative humidity, more on that later.

Based on what happened yesterday, building ridge, persistent
offshore flow, model trends - bumped up MAX temperatures for
Tuesday. Highs will generally be in the 70s and mid 80s at the
coast and 80s to lower 90s inland - or about 10-15 degrees above
normal. Daytime temperatures will hold steady on Wednesday before
rebounding on Thursday with the strongest offshore flow.

Temperatures on Thursday will likely be the warmest of the week
with highs in the 80s at the coast and upper 80s to mid 90s
interior. Friday was low confidence on MAX temps, but latest
guidance suggest another day of hot weather with lingering
offshore flow. Cooling trend finally develop over the weekend and
more so next week. Thermal belts will be in full effect the next
few nights with overnight lows mild in the hills due to offshore
flow.

Speaking of offshore flow there will be some ebb and flow of the
offshore pressure gradient strength the next few days. None the
less, the period of strongest offshore flow in the short term is still
focused on Wednesday night into Thursday morning. Models have been
rather consistent with hitting the north bay mts with the highest
winds. Local gusts up to 60 mph still seem plausible. East bay
hills will see weaker winds, but a gust up to 40 mph still seems
like a possibility. The same can be said for the santa cruz mts
with gusts up to 30 mph. The set up definitely keeps the wind
threat more elevated in the hills and less in the valleys, but the
occasional gust in the valley could happen. Winds ease through the
day on Thursday and more so on Friday as the offshore flow
gradient weakens. The weakening gradient is a result of shifting
high pressure and a trough digging into the pac NW Friday.

For several days now another offshore flow wind event has been
advertised on Sunday. The details, timing and strength, have
varied from model to model and run to run. However, one thing that
has stayed the same is another round of offshore flow. Latest 00z
models are still very robust with some suggesting the Sunday
offshore flow set up could be stronger than Wednesday night. For
now, will have another strong offshore flow event, focused on the
north bay again, but not going overboard on the potential just
yet.

For specific fire weather details see below.

Aviation As of 4:45 am pdt Tuesday... Light north to
northeasterly flow will maintain predominantly clear skies over
area terminals through the forecast period. Slightly stronger
winds are expected through the afternoon and evening hours.

Vicinity of ksfo...VFR.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR.

Fire weather As of 4:05 am pdt Tuesday... Fire weather forecast
remains on track. Near critical fire weather conditions will
exist between now and early Wednesday with periods of gusty
offshore winds, lowering relative humidity and warming
temperatures. By Wednesday afternoon however the the offshore
gradient begins to increase resulting in increasing winds across
the north bay mountains. Winds will gradually increase over the
east bay hills and santa cruz mountains Wednesday night and early
Thursday morning. As the winds increase, relative humidity will
gradually decrease with poor humidity recovery Wednesday night.

Therefore the fire weather watch remains valid initially over the
north bay mountains Wednesday afternoon and then east bay
hills santa cruz mts Wednesday night. Relative humidity really
plummets during the day on Thursday despite some weakening winds.

Given very low rh and another day of hot temperatures decided to
keep the watch through peaking heating on Thursday. After
coordinating with neighboring forecast offices will let day shift
convert the watch to a red flag warning after morning coordination
calls have been completed with fire agencies and fire partners.

Do want to emphasize this is not an extreme event. It is fall and
the bay area typically sees offshore flow events like this.

Now for round two - as mentioned above models have been suggesting
another and potentially stronger offshore flow event over the
weekend. Peak for the second would likely be Saturday night and
Sunday morning. If the forecast stays on track additional fire
watches warnings will likely be issued. It's just one model run,
but if the 00z GFS would verify the sfo-wmc gradient is greater
than 20 mb. Needless to say stay tuned...

Marine As of 2:52 am pdt Tuesday... High pressure ridging over
the pacific northwest will produce moderate northerly winds across
the coastal waters through midweek. Strongest winds are expected
across the northern outer waters. As high pressure builds in over
the great basin during the second half of the week, a thermal
trough will develop along the coast. This will result in light
offshore flow across the coastal waters. A moderate northwest
swell will continue through midweek.

Mtr watches warnings advisories
Tday Sca... Pt arena to pigeon pt 10-60 nm
sca... Pt pinos to pt piedras blancas 0-10 nm from 5 pm
sca... Pigeon pt to pt piedras blancas 10-60 nm from 5 pm
sca... Pt arena to pt reyes 0-10 nm from 3 pm
public forecast: mm
aviation: cw
marine: cw
fire weather: mm
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 11 mi52 min Calm G 1 58°F 65°F1022.6 hPa
AAMC1 - 9414750 - Alameda, CA 14 mi58 min ENE 1 G 2.9 60°F 62°F1022.4 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi52 min Calm G 1.9 59°F 1020.9 hPa
PXSC1 15 mi52 min 60°F 55°F
FTPC1 - 9414290 - San Francisco, CA 16 mi58 min SSW 1.9 G 2.9 58°F 57°F1022 hPa
LNDC1 16 mi52 min ESE 1.9 G 2.9 60°F 1021.9 hPa
OBXC1 16 mi52 min 60°F 58°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi52 min SSE 1 G 1.9 59°F 1021.9 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 16 mi58 min E 1.9 G 1.9
46237 - San Francisco Bar, CA (142) 19 mi40 min 55°F5 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 22 mi41 min Calm 61°F 1022 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 23 mi52 min E 1.9 G 4.1 59°F 1022.2 hPa
RCMC1 - 9414863 - Richmond, CA 24 mi58 min Calm G 1 60°F 61°F1021.8 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 27 mi30 min NW 7.8 G 12 55°F 1022.3 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 34 mi52 min Calm G 1 61°F 1021.7 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi58 min Calm G 1 59°F 62°F1022.3 hPa
UPBC1 35 mi52 min Calm G 1.9
PCOC1 - 9415144 - Port Chicago, CA 38 mi52 min SW 4.1 G 4.1 57°F 64°F1022.3 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 41 mi58 min Calm G 1.9 67°F 1022 hPa
PRYC1 - 9415020 - Point Reyes, CA 42 mi52 min 53°F1021.6 hPa
SFXC1 - San Francisco Bay Reserve, CA 47 mi115 min NNW 1.9 49°F 1022 hPa46°F

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA3 mi1.7 hrsN 010.00 miFair58°F45°F62%1021.7 hPa
San Carlos Airport, CA8 mi48 minN 010.00 miClear57°F46°F67%1022.3 hPa
Half Moon Bay Airport, CA8 mi45 minN 010.00 miFair45°F42°F93%1021.7 hPa
Oakland, Metro Oakland International Airport, CA12 mi47 minNE 310.00 miFair53°F45°F74%1022.3 hPa
Hayward, Hayward Air Terminal, CA15 mi46 minN 010.00 miFair55°F42°F62%1022.6 hPa
Palo Alto Airport, CA16 mi53 minN 010.00 miClear50°F46°F88%1022 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hrW4CalmCalm3CalmNE3N3E3W9W13W13W13NW5SW3CalmW53NW4W3S3CalmCalmCalmCalm
1 day agoS3CalmCalmE4E5W12W14W17W18W15W18W15W15W17W13W12W5SW3SW3W3CalmS5SW3Calm
2 days agoW5SE3CalmNW8NW8SW10SW13
G19
W12W12W10W10W8W11W12W7NW6NW3CalmNW4CalmSW3CalmNW3SW3

Tide / Current Tables for Coyote Point Marina, San Francisco Bay, California
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Coyote Point Marina
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Tue -- 12:49 AM PDT     Moonrise
Tue -- 01:40 AM PDT     0.29 feet Low Tide
Tue -- 07:24 AM PDT     Sunrise
Tue -- 08:46 AM PDT     6.18 feet High Tide
Tue -- 02:08 PM PDT     2.97 feet Low Tide
Tue -- 03:26 PM PDT     Moonset
Tue -- 06:22 PM PDT     Sunset
Tue -- 07:40 PM PDT     6.62 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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10.40.30.81.72.94.25.366.25.854.13.333.2455.96.56.66.153.6

Tide / Current Tables for Oyster Point 2.8 mi E, South San Francisco Bay, California Current
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Oyster Point 2.8 mi E
Click for Map
Tue -- 12:49 AM PDT     Moonrise
Tue -- 02:15 AM PDT     0.00 knots Slack
Tue -- 05:29 AM PDT     0.94 knots Max Flood
Tue -- 07:24 AM PDT     Sunrise
Tue -- 09:03 AM PDT     -0.01 knots Slack
Tue -- 11:44 AM PDT     -0.84 knots Max Ebb
Tue -- 02:41 PM PDT     0.00 knots Slack
Tue -- 03:27 PM PDT     Moonset
Tue -- 05:24 PM PDT     0.59 knots Max Flood
Tue -- 06:22 PM PDT     Sunset
Tue -- 08:11 PM PDT     -0.00 knots Slack
Tue -- 11:56 PM PDT     -1.60 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.3-0.8-0.20.30.70.90.90.80.50-0.5-0.8-0.8-0.6-0.30.10.40.60.60.40.1-0.4-1-1.4

Weather Map
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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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Wind Forecast for San Francisco/Monterey Bay Area, CA (10,2,3,4)
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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.