Monday, August21, 2017 L-36.com


Marine Weather and Tides
Millbrae, CA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
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.

Sunrise 6:29AMSunset 7:55PM Sunday August 20, 2017 9:43 PM PDT (04:43 UTC) Moonrise 4:14AMMoonset 6:23PM Illumination 1% Phase: Waning Crescent; Moon at 29 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- 824 Pm Pdt Sun Aug 20 2017
Tonight..SW winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft at 10 seconds. Patchy fog after midnight.
Mon..SW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 5 ft at 10 seconds. Patchy fog in the morning.
Mon night..SW winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft at 9 seconds. Patchy fog after midnight.
Tue..SW winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft at 12 seconds. Patchy fog in the morning.
Tue night..W winds 10 kt. Wind waves 2 ft or less. Mixed swell nw 2 to 4 ft at 13 seconds and S 3 ft at 13 seconds.
Wed..W winds 5 to 15 kt. Wind waves 1 to 3 ft. Mixed swell nw 2 to 4 ft and S 3 ft.
Thu..W winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 4 to 6 ft. SWell sw 3 ft.
Fri..W winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 4 to 6 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 4 to 5 ft with a dominant swell period of 10 seconds. Across the bar...combined seas 4 to 6 ft with a dominant swell period of 10 seconds. Maximum ebb current of 1.9 knots at 02:48 am Monday and 1.2 knots at 04:00 pm Monday.
PZZ500 824 Pm Pdt Sun Aug 20 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds over the outer coastal waters will continue to subside this evening and overnight. Breezy from the golden gate bridge to angel island will dissipate later this evening. Winds are forecast to remain generally light for both Monday and Tuesday.

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 210331
afdmtr
area forecast discussion
national weather service san francisco bay area
831 pm pdt Sun aug 20 2017

Synopsis Cooling will continue early this week as an upper
trough of low pressure becomes nearly stationary over the eastern
pacific. Coastal areas will see little in the way of change with
continued night and morning low clouds and patchy fog.

Discussion As of 08:23 pm pdt Sunday... The forecast remains on
track. The evening update only included some minor tweaks to temps
and sky. The most significant of the minor tweaks were to the sky
cover over the east bay this evening and tonight. Instead of
clear, they have been made partly cloudy. This is a result of the
easterly flow aloft and the storms over the sierras today. Some of
the blow off is heading toward east bay which necessitated an
increase in cloud cover for the night. Looking at the convective
parameters, it looks like all the energy has been used up and
should not pose any threat of rain or lightning for the area. That
said, we are 24 7 365 and watch the radar when anything is
happening in our neighboring areas. If what is forecast changes,
we will be on it. Have a great night and enjoy our partial eclipse
tomorrow. Be eye safe, don't stare at the sun.

Prev discussion As of 2:00 pm pdt Sunday... Clouds have burned-off
from most of our CWA although still have a few patches near and
along the coast. Temperatures have been running close to
yeterday's numbers with most locations in the 60s and 70s at the
coast with 70s and 80s inland. Satellite shows widspread clouds
off the coast, and with the marine layer still over 2000 feet plus
the onshore gradient still around 2 mb west-to-east clouds will
return back to most of the same locations overnight.

For those planning on watching the eclipse (remember to get the
correct lenses) tomorrow morning, still looks like the farther
inland you are the better shot at seeing it starting at 9 am. The
big question remains how quickly the clouds will dissipate through
the morning hours. Feeling right now is the south bay through
santa clara valley will see mostly clear conditions around the
start while farther to the north stretching from san francisco to
oakland there will likely be clouds at first. However, the hope if
they will dissipate during the hour with good viewing before the
peak time. Most of our coastal locations will likely remain cloudy
all morning.

Outside of the eclipse, not much to talk about as we are going to
continue to see overnight clouds, clearing during the day, and
temperatures remaining cool the first part of the week followed by
a modest warming trend going into the weekend as a ridge of high
pressure rebuilds into our region. No chance of rain.

Aviation As of 4:47 pm pdt Sunday... A weak surface low 120 miles
west of santa cruz tilts southward with height to a mid level nearly
stationary and dry closed low near the channel islands. This low is
producing a solid southerly wind component through the stratus field
while an onshore pressure gradient from sfo-sac is present at 2.6 mb.

Wildfire smoke entrained into this low pressure circulation continues
to be present aloft. Convection along the sierra nevada will eventually
transform into mid level cloud debris drifting westward over the area
tonight. In all, it's a difficult TAF forecast package, but thinking
is that the stratus will reach into the north bay a little more quickly
than it does over to the east bay and south bay areas including the
bay side of the sf peninsula. Stratus will prob wrap around to ksns
earlier than it reaches kmry this evening.

Warming 925 mb level temperatures results in reinforcement and possibly
some compression of the marine layer depth tonight, thus ifr CIGS and
vsbys becoming increasingly likely tonight into Monday morning.VFR
should return by mid-late Monday morning with the last places to clear
out being the north bay and along the immediate coast of santa cruz
and san mateo counties.

Vicinity of ksfo... West wind near 15 knots this evening.VFR likely
holding much of the night, tempo ifr forecast 12z-16z Monday morning.

Vfr returns Monday. Hazy due to wildfire smoke affecting slant range
visibilities.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... MVFR ifr CIGS redeveloping this evening.

Hazy due to wildfire smoke affecting slant range visibilities. Ifr
cigs tonight and Monday morning til approx 17z.

Eclipse Here are the times for the start, peak, and end of the
eclipse for Monday morning. The percent of obscuration for each
location is also listed.

Santa rosa... San francisco... Oakland... San jose... Monterey

Start... 9:01... ... ... .9:01... ... ... 9:02... ... 9:02... ... .9:02..

Peak... 10:15... ... ... 10:15... ... ..10:15... ..10:16... ... 10:16..

End... .11:37... ... ... 11:37... ... ..11:37... ..11:38... ... 11:38..

Obsur... .78%... ... ... ..76%... ... ... .76%... ... .74%... ... ..71%...

Marine As of 4:24 pm pdt Sunday... Moderate northwest winds
will continue subsiding this evening and overnight for the outer
coastal waters. Typical breezy conditions are possible from the
golden gate bridge to angel island through the evening hours.

Winds are forecast to remain generally light for both Monday and
Tuesday.

Mtr watches warnings advisories
Tngt Sca... Sf bay until 9 pm
sca... Pt arena to pigeon pt 10-60 nm until 9 pm
public forecast: bell bfg
aviation: canepa
marine: rowe
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 11 mi43 min NW 5.1 G 7 66°F 74°F1011.6 hPa (+1.0)
AAMC1 - 9414750 - Alameda, CA 14 mi43 min W 5.1 G 9.9 63°F 69°F1013.1 hPa (+0.8)
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi43 min WSW 7 G 11 62°F 1011.7 hPa (+0.9)
PXSC1 15 mi43 min 64°F 60°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi43 min W 8 G 11 63°F 1012.6 hPa (+0.8)
OBXC1 16 mi43 min 63°F 60°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 16 mi43 min W 8.9 G 11
FTPC1 - 9414290 - San Francisco, CA 16 mi43 min WSW 5.1 G 12 62°F 62°F1013 hPa (+0.7)
LNDC1 16 mi43 min W 6 G 8.9 63°F 1012.7 hPa (+0.9)
46237 - San Francisco Bar, CA (142) 19 mi43 min 60°F4 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 22 mi51 min WSW 7 62°F 1013 hPa (+1.0)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 23 mi43 min W 8 G 9.9 64°F 1012.9 hPa (+1.0)
RCMC1 - 9414863 - Richmond, CA 24 mi43 min WNW 6 G 8 63°F 64°F1012.6 hPa (+1.1)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 27 mi53 min N 1.9 G 1.9 60°F 60°F5 ft1013.1 hPa (+0.6)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 30 mi53 min SE 5.8 G 5.8 61°F 62°F6 ft1012.4 hPa (+0.8)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 34 mi43 min WSW 12 G 17 64°F 1012 hPa (+1.4)
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi43 min WSW 19 G 25 64°F 69°F1011.7 hPa (+1.1)61°F
PCOC1 - 9415144 - Port Chicago, CA 38 mi43 min WSW 17 G 22 64°F 69°F1011.2 hPa (+1.0)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 41 mi43 min WNW 20 G 25 67°F 1010.1 hPa (+0.6)
PRYC1 - 9415020 - Point Reyes, CA 42 mi43 min Calm G 0 64°F 62°F1013.1 hPa (+0.9)
SFXC1 - San Francisco Bay Reserve, CA 47 mi58 min W 13 65°F 1010 hPa59°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 mi1.8 hrsW 810.00 miA Few Clouds64°F55°F75%1012 hPa
Half Moon Bay Airport, CA8 mi48 minSSE 310.00 miOvercast63°F59°F88%1012.5 hPa
San Carlos Airport, CA8 mi1.9 hrsVar 310.00 miA Few Clouds68°F57°F69%1011.8 hPa
Oakland, Metro Oakland International Airport, CA12 mi50 minWNW 910.00 miPartly Cloudy63°F60°F90%1012.4 hPa
Hayward, Hayward Air Terminal, CA15 mi49 minNNW 910.00 miFair64°F55°F75%1013 hPa
Palo Alto Airport, CA16 mi56 minNNW 810.00 miClear68°F60°F78%1012.2 hPa
Mountain View, Moffett Field, CA21 mi47 minN 710.00 miFair67°F62°F84%1012.5 hPa

Wind History from SFO (wind in knots)
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Last 24hrCalmS6S9S10S5SW5SW4SW4SW6S11SW6S7E5NE7NE10N10SW13W12SW8SW12W12W11W8NW8
1 day agoNW8NW7W8NW6W5W7CalmCalmS3S4Calm3NW4N3NE7NE6NE6W8
G16
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2 days agoW12W15W13W11W10W10W9W9W7W6W6W6NE4NE5NW12NW17NW16W16NW17NW18NW16W16W14W10

Tide / Current Tables for Coyote Point Marina, San Francisco Bay, California
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Coyote Point Marina
Click for Map
Mon -- 12:02 AM PDT     8.30 feet High Tide
Mon -- 06:21 AM PDT     Moonrise
Mon -- 06:30 AM PDT     Sunrise
Mon -- 06:58 AM PDT     -0.92 feet Low Tide
Mon -- 11:31 AM PDT     New Moon
Mon -- 01:28 PM PDT     7.21 feet High Tide
Mon -- 06:59 PM PDT     1.75 feet Low Tide
Mon -- 07:53 PM PDT     Sunset
Mon -- 08:04 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
8.37.96.64.72.70.8-0.5-0.9-0.40.92.74.66.27.17.16.24.83.42.21.82.23.55.16.7

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
Mon -- 12:31 AM PDT     -0.00 knots Slack
Mon -- 04:09 AM PDT     -2.13 knots Max Ebb
Mon -- 06:21 AM PDT     Moonrise
Mon -- 06:30 AM PDT     Sunrise
Mon -- 07:23 AM PDT     0.00 knots Slack
Mon -- 10:32 AM PDT     1.33 knots Max Flood
Mon -- 11:31 AM PDT     New Moon
Mon -- 01:43 PM PDT     -0.00 knots Slack
Mon -- 04:43 PM PDT     -1.35 knots Max Ebb
Mon -- 07:25 PM PDT     0.00 knots Slack
Mon -- 07:53 PM PDT     Sunset
Mon -- 08:04 PM PDT     Moonset
Mon -- 10:25 PM PDT     1.11 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.3-0.4-1.3-1.9-2.1-2-1.4-0.40.411.31.310.5-0.2-0.9-1.3-1.3-1-0.40.30.81.11.1

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 (0,6,7,8)
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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.