Monday, July13, 2020
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Marine Weather and Tides
Alameda, CA

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
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.

Sunrise 5:56AMSunset 8:33PM Monday July 13, 2020 4:56 PM PDT (23:56 UTC) Moonrise 12:07AMMoonset 1:09PM Illumination 39% Phase: Third Quarter Moon; Moon at 23 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 Pm Pdt Mon Jul 13 2020
.small craft advisory in effect until 11 pm pdt this evening...
.small craft advisory in effect from Tuesday morning through Tuesday evening...
Tonight..W to sw winds 15 to 25 kt...decreasing to 5 to 15 kt overnight.
Tue..W to sw winds 5 to 15 kt...increasing to 15 to 25 kt in the afternoon.
Tue night..SW winds 5 to 15 kt.
Wed..SW winds 5 to 15 kt.
Wed night..SW winds 5 to 15 kt.
Thu..SW winds 5 to 15 kt.
Thu night..SW winds 5 to 15 kt.
Fri..SW winds 5 to 15 kt.
Sat..SW winds 5 to 15 kt.
PZZ500 232 Pm Pdt Mon Jul 13 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate to locally strong northwest winds will persist over the northern and outer coastal waters through Tuesday. These winds will generate steep fresh swell resulting in hazardous conditions for small craft vessels. Additionally, winds will be strong from the golden gate through the delta. By midweek, a nearly stationary low pressure trough will develop over the coastal waters and cause winds to shift to a southerly direction mainly over the southern and inner coastal waters. A longer period south swell will mix with the steep fresh northwest swell.


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 132151 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 251 PM PDT Mon Jul 13 2020

SYNOPSIS. Interior areas are forecast to cool through midweek as onshore flow increases and high pressure weakens. Temperatures will then likely remain near seasonal averages for the remainder of the week and into next weekend. Expect increasing night and morning low clouds through midweek.

DISCUSSION. as of 03:00 PM PDT Monday . Marine layer is up to around 1700ft on the Fort Ord Temperature Profiler as boundary layer conditions return to what is typically expected for early- to-mid July.

The 596dm 500mb upper-level ridge has trekked eastward into the Texas Panhandle. Low-clouds and fog dissipated from northwestern Alameda county, most the Bay, and the Salinas Valley since this morning but are still widespread along the coast, with stratus inclusion along the Golden Gate and all the way down to Monterey Bay. A small clearing is visible over Santa Cruz and most of coastal Santa Cruz county owing to the onshore flow.

Min temps across the interior were observed in the upper 50s to low 60s F range with higher-elevation areas like those up in the East Hills just barely making it into the low 60s F. This a sharp contrast from the 70s F that were observed on Saturday and Sunday Morning.

Troughing over the Western Canadian Prairies and the Pacific Northwest has reintroduced onshore flow that is typical for this time of the year. Expect cooling trend across the interior, where max temps are progged to be 7 to 12 degrees F lower than yesterday's. As we head into Tuesday and Wednesday, off-shore cyclonic flow will increase, resulting in southerly flow near the surface which will allow for more cooling to occur along the coast. Due to this setup we should also expect the marine layer to continue to build and for lower morning ceilings as the workweek progresses.

Another disturbance is set to develop off the Gulf of Alaska and make its way down the Alexander Archipelago, with its axis expected to be over Vancouver Island sometime Thursday morning/afternoon. As the weaker upper-level ridge sits over the Texas Panhandle, it will introduce anticyclonic flow that, combined with the offshore cyclonic flow from the upper-level trough will result in the first slug of monsoonal activity for the CWA and surrounding areas. The added moisture may potentially lead to the development of accus across the North Bay Thursday afternoon as an unstable air mass develops east of our CWA and along the Sierra. Confidence is currently high that we do not expect any major dry lightning concerns from this setup over our CWA, but it is a setup that we'll be monitoring as we get closer to Thursday. For now, the possibility for some accus could make for dazzling sunsets over parts of our CWA.

Going into the weekend, expecting some onshore flow to continue and for a slight uptick in temps across the interior as model guidance suggests that a strong upper- level ridge will begin building off the coast ahead of the departing disturbance.

AVIATION. as of 10:25 AM PDT Monday . for 18z TAFs. Morning low clouds continue to dissipate. VFR at most terminals with the hold outs being MRY and SNS with a few low lingering clouds. Expect VFR this afternoon at all terminals. Marine layer is forecast to return again tonight:farther inland and slightly deeper.

Vicinity of KSFO . VFR expected through early tonight. Breezy to occasionally NW winds will impact the terminal through late this afternoon. Not strong enough for Aubert Weather Warning, but gusts 25-30kt possible. Lower conf on clouds tonight, but given how close they were this morning and the forecast for a deeper marine layer, decided to bring clouds in late tonight.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Lingering IFR conditions will continue to diminish for SNS and lastly MRY. VFR expected this afternoon with breezy onshore flow. Low CIGS return late this afternoon/early evening with some patchy fog.

MARINE. as of 10:20 AM PDT Monday . High pressure to the north and low pressure inland will result in gusty northwest winds over the northern and outer coastal waters through Tuesday. These winds will generate steep fresh swell resulting in hazardous conditions for small craft vessels. By midweek, a nearly stationary low pressure trough will develop over the coastal waters and cause winds to shift to a southerly direction mainly over the southern and inner coastal waters. A longer period south swell will mix with the steep fresh northwest swell.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm until 3 PM SCA . SF Bay until 11 PM SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm until 6 PM



PUBLIC FORECAST: Diaz/DP AVIATION: MM MARINE: MM

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
AAMC1 - 9414750 - Alameda, CA 1 mi69 min 71°F
FTPC1 - 9414290 - San Francisco, CA 10 mi69 min 63°F
RCMC1 - 9414863 - Richmond, CA 12 mi69 min 66°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 12 mi53 min WNW 6 60°F 1011 hPa
46237 - San Francisco Bar, CA (142) 19 mi57 min 58°F4 ft
MZXC1 - 9415102 - Martinez-Amorco CA 19 mi69 min 74°F
RTYC1 - 9414523 - Redwood City, CA 19 mi69 min 75°F
PCOC1 - 9415144 - Port Chicago, CA 23 mi69 min 74°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 30 mi37 min W 7.8 G 12 55°F 55°F1013.2 hPa52°F
SFXC1 - San Francisco Bay Reserve, CA 32 mi72 min W 12
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 43 mi37 min WNW 9.7 G 14 57°F 1014.2 hPa54°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 mi64 minW 1010.00 miA Few Clouds69°F54°F59%1012 hPa
Hayward, Hayward Air Terminal, CA12 mi63 minNW 1510.00 miFair69°F54°F59%1012.5 hPa
San Francisco, San Francisco International Airport, CA12 mi61 minW 1610.00 miA Few Clouds69°F52°F55%1011.7 hPa
San Carlos Airport, CA17 mi70 minWSW 12 G 1610.00 miA Few Clouds75°F53°F47%1011.2 hPa
Concord, Buchanan Field, CA18 mi64 minS 1510.00 miFair83°F54°F37%1008.3 hPa
Palo Alto Airport, CA22 mi70 minN 14 G 2110.00 miClear72°F57°F61%1011.2 hPa
Half Moon Bay Airport, CA22 mi62 minS 54.00 miA Few Clouds with Haze57°F51°F82%1014.2 hPa

Link to 5 minute data for KOAK

Wind History from OAK (wind in knots)
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Last 24hrW13W14W14W16W9W13W11W10W7NW3CalmN3CalmSW8SW10SW10W11W9W5NW5NW10NW9W12W10
1 day agoW12NW11W13W13W9NW5NW4CalmCalmNW3NW7NW7N3CalmNW5NW7W7W6W7W8NW9NW13NW15W16
2 days agoW10W13NW9W11W8NW7NW4NW6N3CalmCalmCalmCalmCalmNW3NW5NW7W7W6NW7NW11W12NW11W15

Tide / Current Tables for Oakland Inner Harbor, San Francisco Bay, California
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Oakland Inner Harbor
Click for Map
Mon -- 01:06 AM PDT     Moonrise
Mon -- 01:41 AM PDT     1.93 feet Low Tide
Mon -- 05:58 AM PDT     Sunrise
Mon -- 07:14 AM PDT     4.13 feet High Tide
Mon -- 12:51 PM PDT     1.78 feet Low Tide
Mon -- 02:09 PM PDT     Moonset
Mon -- 07:39 PM PDT     5.89 feet High Tide
Mon -- 08:31 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.5222.22.83.43.94.143.632.41.91.822.73.54.55.35.85.95.54.73.8

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

Mon -- 12:27 AM PDT     0.00 knots Slack
Mon -- 01:06 AM PDT     Moonrise
Mon -- 04:51 AM PDT     0.16 knots Max Flood
Mon -- 05:58 AM PDT     Sunrise
Mon -- 07:21 AM PDT     -0.00 knots Slack
Mon -- 09:19 AM PDT     -0.20 knots Max Ebb
Mon -- 12:04 PM PDT     0.00 knots Slack
Mon -- 02:09 PM PDT     Moonset
Mon -- 04:54 PM PDT     0.21 knots Max Flood
Mon -- 07:38 PM PDT     -0.00 knots Slack
Mon -- 08:31 PM PDT     Sunset
Mon -- 10:03 PM PDT     -0.28 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.100.10.10.20.20.10-0.1-0.2-0.2-0.1-00.10.10.20.20.20.20.1-0.1-0.2-0.3-0.2

Weather Map
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wmap_P
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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (19,4,5,8)
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Ground Weather Radar Station San Francisco Bay Area, CA
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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 numerous 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.