Sunday, April30, 2017 L-36.com


Marine Weather and Tides
Millbrae, CA

Version 3.4
What's New / NOTES
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:12AMSunset 8:01PM Sunday April 30, 2017 7:51 AM PDT (14:51 UTC) Moonrise 9:12AMMoonset 11:48PM Illumination 21% Phase: Waxing Crescent; Moon at 5 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 Point Reyes To Pigeon Point To 10 Nm- 217 Am Pdt Sun Apr 30 2017
.small craft advisory in effect through Monday afternoon...
Today..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 8 to 10 ft at 10 seconds.
Tonight..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 8 to 10 ft at 9 seconds.
Mon..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 7 to 9 ft at 9 seconds.
Mon night..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 8 to 10 ft at 9 seconds.
Tue..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 7 to 9 ft at 9 seconds.
Wed..NW winds 5 to 15 kt. Wind waves 1 to 3 ft...becoming 2 ft or less. NW swell 5 to 7 ft. SWell southwest 3 ft.
Thu..W winds 10 kt. Wind waves 2 ft or less. W swell 5 to 7 ft and southwest 3 ft. Patchy fog.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 4 to 6 ft at 10 seconds. Across the bar...combined seas 5 to 7 ft at 10 seconds. Maximum ebb current of 1.9 knots at 06:18 am Sunday and 0.9 knots at 07:36 pm Sunday.
PZZ500 217 Am Pdt Sun Apr 30 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure will continue to generate strong northwest winds today and through the majority of the forecast period for the coastal waters. Winds may subside slightly by Thursday. In addition...the strong winds will also continue to cause very rough seas due to fresh swells with short periods.

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 301126
afdmtr
area forecast discussion
national weather service san francisco bay area
426 am pdt Sun apr 30 2017

Synopsis Sunny and seasonably warm weather will continue across
our region today with temperatures similar to those of yesterday.

Warming is then forecast from Monday through Wednesday as
offshore flow develops and high pressure strengthens over
california. Widespread 80s are forecast by Tuesday and Wednesday,
with some lower to mid 90s in the warmest inland areas. A cooling
trend is then forecast Thursday and Friday as the upper ridge over
california is replaced by a trough. Rain showers are possible
next weekend when an upper low is forecast to develop over
california.

Discussion As of 3:25 am pdt Sunday... The light offshore flow
that was in place across our region early yesterday morning has
been replaced by light onshore flow. As a result, current surface
dewpoints are as much as 15 degrees f above what they were at the
same time early yesterday morning, and patchy light fog is
currently being reported at half moon bay and watsonville.

However, the boundary layer has probably not moistened enough for
widespread development of coastal low clouds/fog. Thus, sunny
conditions are expected across our forecast area once again today.

However, our warming trend will be suspended for today as
increased moisture in the low levels will offset continued
airmass warming aloft. The net effect will probably be slightly
cooler high temperatures near the coast today, and temperatures
near persistence inland.

Offshore flow is forecast to redevelop tonight as surface high
pressure builds inland to our north and east. In fact, locally
gusty north winds are expected to develop in the hills by late
tonight and Monday morning, and then again late Monday night and
Tuesday morning. Wind gusts in the hills may reach 30-35 mph in
isolated locations during the night and morning hours. This
offshore flow will result in renewed drying of the airmass across
our region. At the same time, the upper ridge that is currently
centered offshore is forecast to shift eastward and over
california, resulting in and increase of 850 mb temperatures
from about 12 degrees c currently to about 19 or even 20 deg c by
Wednesday. These developments will result in a resumption of the
warming trend on Monday, with warming continuing regionwide into
Tuesday and on into Wednesday in many areas. The warmest days of
the week are expected to be Tuesday and Wednesday when widespread
80s are forecast, with low to mid 90s likely in the warmer inland
areas. Even coastal areas will probably see highs up around 80
due to offshore flow. High temperatures will be as much as 15
degrees warmer than normal on Tuesday and Wednesday, and these
two days are likely to be the warmest days our region has seen
since last october.

Significant cooling is forecast for Thursday and Friday as the
upper ridge moves off to our east and an upper trough develops
near the west coast. Expect temperatures to cool by at least 10
degrees on Thursday and drop back down to around seasonal averages
by Thursday. Low clouds and fog will likely develop in coastal
areas by Thursday.

The longer range models indicate an upper low will drop south
along or near the west coast next weekend, producing a chance of
showers across our forecast area. The 00z ECMWF is especially
bullish with precip chances showing widespread rainfall across our
area by next Sunday.

Aviation As of 04:22 am pdt Sunday... For 12z tafs. Another day
ofVFR in store at all terminals. High pressure will continue to
dominate over the region, with perhaps only a few high clouds
through the day. Winds should remain light-moderate, occasionally
gusty, from the west/northwest this afternoon. By late tonight,
guidance suggests some low level moisture returning, especially
for monterey bay terminals. The extend and coverage is still
unknown at this time. With high pressure in control, did not see
enough reason to include CIGS in the 12z TAF update. Moderate to
high confidence.

Vicinity of ksfo...VFR. Light to moderate onshore winds this
afternoon and evening, gusty at times.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR. Mainly light to moderate onshore winds
this afternoon, should stay below 15 kt. Did include few-sct low
clouds by 08z, with the possibility of MVFR/ifr CIGS before
sunrise Monday. However, confidence is low at this time.

Marine As of 04:05 am pdt Sunday... High pressure will continue
to generate strong northwest winds today and through the majority
of the forecast period for the coastal waters. Winds may subside
slightly by Thursday. In addition, the strong winds will also
continue to cause very rough seas due to fresh swells with short
periods.

Mtr watches/warnings/advisories
Tday Sca... Pigeon pt to pt pinos 0-10 nm from 3 pm
sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Mry bay from 3 pm
public forecast: dykema
aviation: bam
marine: bam
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 11 mi51 min SW 1 G 1.9 55°F 64°F1020 hPa (+0.6)
AAMC1 - 9414750 - Alameda, CA 14 mi51 min Calm G 1 57°F 63°F1021 hPa (+0.8)
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi51 min NNE 1.9 G 4.1 56°F 1019.6 hPa (+0.9)
PXSC1 15 mi51 min 56°F 49°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi51 min SSW 1.9 G 2.9 55°F 1020.7 hPa (+1.0)
OBXC1 16 mi51 min 56°F 49°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 16 mi51 min Calm G 1
FTPC1 - 9414290 - San Francisco, CA 16 mi51 min S 4.1 G 4.1 52°F 54°F1020.9 hPa (+0.8)
LNDC1 16 mi51 min N 1 G 1.9 55°F 1020.6 hPa (+0.8)
46237 - San Francisco Bar, CA (142) 19 mi51 min 53°F6 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 22 mi44 min Calm 60°F 1021 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 23 mi51 min S 2.9 G 5.1 57°F 1020.8 hPa (+0.7)
RCMC1 - 9414863 - Richmond, CA 24 mi51 min S 1.9 G 4.1 55°F 58°F1020.3 hPa (+0.8)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 27 mi61 min NNW 12 G 14 51°F 50°F8 ft1020.5 hPa (+0.8)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 30 mi61 min NNW 14 G 16 53°F 52°F8 ft1020.7 hPa (+0.9)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 34 mi51 min W 1.9 G 2.9 57°F 1020.2 hPa (+1.1)
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi51 min W 6 G 7 56°F 60°F1020.8 hPa (+1.2)54°F
UPBC1 35 mi51 min WNW 5.1 G 7
PCOC1 - 9415144 - Port Chicago, CA 38 mi51 min SSW 1.9 G 5.1 55°F 60°F1020.3 hPa (+1.4)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 41 mi51 min NW 2.9 G 4.1 59°F 1020.2 hPa (+1.7)
PRYC1 - 9415020 - Point Reyes, CA 42 mi51 min WNW 16 G 19 53°F 51°F1020 hPa (+0.7)
SFXC1 - San Francisco Bay Reserve, CA 47 mi66 min N 1.9 52°F 1020 hPa49°F

Wind History for Redwood City, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA3 mi55 minW 39.00 miFair52°F46°F80%1020.4 hPa
Half Moon Bay Airport, CA8 mi56 minENE 34.00 miFog/Mist43°F41°F93%1021 hPa
San Carlos Airport, CA8 mi56 minN 010.00 miFair54°F44°F72%1020.7 hPa
Oakland, Metro Oakland International Airport, CA12 mi58 minNE 310.00 miFair53°F48°F86%1020.6 hPa
Hayward, Hayward Air Terminal, CA15 mi57 minno data10.00 miFair54°F44°F69%1021.4 hPa
Palo Alto Airport, CA16 mi64 minN 010.00 miClear50°F48°F94%1020.3 hPa
Mountain View, Moffett Field, CA21 mi55 minN 010.00 miFair53°F48°F83%1020.8 hPa

Wind History from SFO (wind in knots)
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Last 24hrN8N7NW13N10N12N9W13W16W18W16W18W20W17W17
G24
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1 day agoW10W12W12W10W14W14W20W20W20W23W21W19
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W18W15W14W9W8NW14N11N9NE4CalmN10N12
2 days agoW4N3N4W9W18W15W18W19
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Tide / Current Tables for Coyote Point Marina, San Francisco Bay, California
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Coyote Point Marina
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Sun -- 03:22 AM PDT     7.60 feet High Tide
Sun -- 06:14 AM PDT     Sunrise
Sun -- 10:12 AM PDT     Moonrise
Sun -- 10:32 AM PDT     -1.09 feet Low Tide
Sun -- 05:25 PM PDT     6.25 feet High Tide
Sun -- 07:58 PM PDT     Sunset
Sun -- 10:40 PM PDT     2.46 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.25.76.97.57.46.54.931.2-0.2-1-1-0.31.12.74.25.56.26.15.44.43.32.62.5

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
Sun -- 01:00 AM PDT     0.82 knots Max Flood
Sun -- 03:49 AM PDT     -0.00 knots Slack
Sun -- 06:14 AM PDT     Sunrise
Sun -- 07:41 AM PDT     -2.01 knots Max Ebb
Sun -- 10:12 AM PDT     Moonrise
Sun -- 11:00 AM PDT     0.01 knots Slack
Sun -- 02:11 PM PDT     1.14 knots Max Flood
Sun -- 05:46 PM PDT     -0.00 knots Slack
Sun -- 07:58 PM PDT     Sunset
Sun -- 08:25 PM PDT     -0.93 knots Max Ebb
Sun -- 11:09 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.70.80.70.4-0.1-0.8-1.4-1.9-2-1.5-0.8-00.511.11.10.80.4-0.1-0.6-0.9-0.9-0.5-0.1

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of CentralWestCoast    EDIT
Geos

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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weather_mapweather_map weather_map

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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.