Tuesday, June18, 2019 L-36.com


Marine Weather and Tides
Alameda, CA

Version 3.4
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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 5:45AMSunset 8:35PM Tuesday June 18, 2019 4:19 AM PDT (11:19 UTC) Moonrise 8:59PMMoonset 5:57AM Illumination 99% Phase: Waning Gibbous; Moon at 16 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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PZZ530 San Pablo Bay, Suisun Bay, The West Delta And The San Francisco Bay North Of The Bay Bridge- 232 Am Pdt Tue Jun 18 2019
Today..SW winds 5 to 15 kt...increasing to 10 to 20 kt.
Tonight..SW winds 10 to 20 kt with occasional gusts up to 25 kt.
Wed..SW winds 5 to 15 kt...increasing to 10 to 20 kt with occasional gusts up to 25 kt.
Wed night..SW winds 15 to 20 kt with gusts up to 25 kt.
Thu..SW winds 10 to 20 kt with gusts up to 30 kt.
Thu night..SW winds 10 to 15 kt.
Fri..SW winds 10 to 15 kt.
Sat..W winds 10 to 15 kt.
PZZ500 232 Am Pdt Tue Jun 18 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate and gusty northerly winds will continue over the northern outer waters through Wednesday afternoon producing steep fresh swells. A thermal trough along the coast will maintain light southerly winds and seas over the near shore waters. Light winds are expected over the bays except for typical gusty afternoon seabreeze.


7 Day Forecast for Marine Location Near Alameda city, CA
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location: 37.78, -122.28     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 181006
afdmtr
area forecast discussion
national weather service san francisco bay area
306 am pdt Tue jun 18 2019

Synopsis Strengthening high pressure will continue a warming
trend today. However, onshore surface winds will persist, keeping
temperatures seasonably cool at the coast. Seasonable
temperatures, along with areas of night and morning low clouds,
are forecast through the end of the week and into the upcoming
weekend.

Discussion As of 3:05 am pdt Tuesday... The marine layer has
compressed slightly since yesterday as an upper level ridge over
the eastern pacific builds inland across northern california.

Meanwhile, surface high pressure to our north over oregon and far
northern california is maintaining a moderate north-to-south
pressure gradient of nearly 5 mb from acv to sfo. The result has
been locally gusty north winds across the higher hills of the
north bay. These gusty winds, in conjunction will rather poor
overnight humidity recoveries in the hills above 2000 feet, is
somewhat concerning from a fire weather perspective. However,
winds in the north bay hills are forecast to subside by mid
morning, and are therefore not expected to have a prolonged or
significant impact.

The combination of a shallower marine layer and reduced onshore
flow has resulted in less inland development of low clouds
overnight compared to the past few nights, especially across the
north and east bay. Therefore, many inland areas are expected to
experience more prolonged sunshine today. In addition, subsidence
under the building upper level ridge has warmed the airmass aloft
a few additional degrees c since yesterday. These factors suggest
that afternoon highs today will be warmer then yesterday,
especially across inland areas. However, persistent onshore flow
at the surface will limit the amount of warming to about 3 to 5
degrees in most areas, and also prevent some coastal areas from
clearing today.

Today will likely be the warmest day of the week. Slightly cooler
temperatures are forecast for Wednesday as an upper trough settles
into the pacific northwest and the ridge over california begins to
weaken. Further cooling is forecast for Thursday as the trough
digs into the northern great basin and the ridge retreats
offshore. There will also likely be an increase in inland
development of night and morning low clouds over the next few
days.

Slight warming is expected on Friday and Saturday as the upper
ridge builds back towards the coast. Despite the changes in
temperatures anticipated during the forecast period, temperatures
are not forecast to vary all that much from seasonal averages
through the week and into next weekend.

In the longer range, the GFS ensemble mean and ECMWF ensemble
mean both forecast an upper trough to be centered along the west
coast next Monday and Tuesday. It therefore appears likely that
cooler than normal conditions will dominate the first half of next
week.

Aviation As of 10:52 pm pdt Monday... For 06z tafs. A robust
northerly gradient of nearly 5 mb coupled with a compressing
marine layer around 1500 ft will keep low clouds from intruding
as far inland as it has the last few nights. Low clouds will
move in through coastal gaps and valley affecting monterey bay
terminals late tonight and bay area terminals early Tuesday
morning. Confidence remains low to moderate. Light to locally
variable winds will prevail overnight then ramp up again Tuesday
afternoon becoming onshore around 10 to 15 kt.

Vicinity of ksfo...VFR conditions through late tonight. MVFR cigs
expected to return around 12-13z Tuesday morning. Clearing is
anticipated around 16-17z Tuesday morning. Light onshore flow
will prevail overnight. A short period of offshore flow is
expected between 15z-21z Tuesday over ksfo. Winds are expected to
ramp up again Tuesday afternoon to around 15 kt.

Sfo bridge approach... Approach will be clear through tonight.

Impacts to approach should be short lived Tuesday morning with
light offshore flow aloft and shallow marine layer.

Monterey bay terminals... Ifr conditions will prevail over ksns
with kmry filling in overnight. Clearing is anticipated around
19z Tuesday. Light to locally variable winds will prevail
overnight then ramp up again Tuesday afternoon becoming onshore
around 10 kt.

Marine As of 2:32 am pdt Tuesday... Moderate and gusty
northerly winds will continue over the northern outer waters
through Wednesday afternoon producing steep fresh swells. A
thermal trough along the coast will maintain light southerly winds
and seas over the near shore waters. Light winds are expected
over the bays except for typical gusty afternoon seabreeze.

Mtr watches warnings advisories
Tday Glw... Pt arena to pigeon pt 10-60 nm
sca... Pt arena to pt reyes 0-10 nm until 3 am
public forecast: dykema
aviation: cw
marine: cw
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TIBC1 - Tiburon Pier, San Francisco Bay, CA 12 mi105 min Calm 55°F 1012 hPa
46237 - San Francisco Bar, CA (142) 19 mi50 min 56°F5 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 30 mi20 min SSE 12 G 16 54°F 56°F1012.9 hPa (+0.0)
SFXC1 - San Francisco Bay Reserve, CA 32 mi95 min W 5.1 61°F 1011 hPa56°F

Wind History for Alameda, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA6 mi27 minN 410.00 miA Few Clouds58°F53°F84%1012.1 hPa
Hayward, Hayward Air Terminal, CA12 mi26 minNNW 49.00 miFair57°F53°F87%1012.8 hPa
San Francisco, San Francisco International Airport, CA12 mi24 minSSE 410.00 miA Few Clouds59°F53°F81%1011.7 hPa
Concord, Buchanan Field, CA18 mi27 minSW 310.00 miFair62°F52°F70%1010.1 hPa
Half Moon Bay Airport, CA22 mi25 minSSE 87.00 miOvercast55°F53°F94%1012.9 hPa

Wind History from OAK (wind in knots)
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Last 24hrSW6SW6S4SE5S5S6SW5W8NW11NW13NW12NW13NW15NW13NW11NW9NW6N7N5NW6N7N6N7N4
1 day agoW9W9W10W8W8W7W8W11NW10NW12NW12W14NW12W17W13W11W8NW4CalmNW6CalmW7SW6SW4
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Tide / Current Tables for Oakland Inner Harbor, San Francisco Bay, California
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Oakland Inner Harbor
Click for Map
Tue -- 12:46 AM PDT     6.70 feet High Tide
Tue -- 05:46 AM PDT     Sunrise
Tue -- 06:57 AM PDT     Moonset
Tue -- 07:42 AM PDT     -1.11 feet Low Tide
Tue -- 03:04 PM PDT     5.19 feet High Tide
Tue -- 07:32 PM PDT     2.89 feet Low Tide
Tue -- 08:33 PM PDT     Sunset
Tue -- 09:58 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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6.56.76.253.31.4-0.1-0.9-1.1-0.60.41.52.844.95.24.94.23.532.93.44.25.1

Tide / Current Tables for Oakland Inner Harbor Reach, 33 ft. below datum Current
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Oakland Inner Harbor Reach
Click for MapFlood direction 82 true
Ebb direction 255 true

Tue -- 12:49 AM PDT     -0.00 knots Slack
Tue -- 03:40 AM PDT     -0.51 knots Max Ebb
Tue -- 05:46 AM PDT     Sunrise
Tue -- 06:41 AM PDT     0.01 knots Slack
Tue -- 06:57 AM PDT     Moonset
Tue -- 11:38 AM PDT     0.40 knots Max Flood
Tue -- 02:35 PM PDT     -0.00 knots Slack
Tue -- 04:17 PM PDT     -0.22 knots Max Ebb
Tue -- 06:32 PM PDT     0.00 knots Slack
Tue -- 08:33 PM PDT     Sunset
Tue -- 09:58 PM PDT     Moonrise
Tue -- 11:06 PM PDT     0.26 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.2-0-0.3-0.5-0.5-0.4-0.200.20.30.40.40.40.30.1-0.1-0.2-0.2-0.100.10.20.20.3

Weather Map and Satellite Images
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wmap_P
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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (7,2,3,4)
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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.