Wednesday, August21, 2019 L-36.com


Marine Weather and Tides
Castro Valley, CA

Version 3.4
NOTICE
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 6:27AMSunset 7:55PM Wednesday August 21, 2019 6:08 PM PDT (01:08 UTC) Moonrise 10:20PMMoonset 11:04AM Illumination 61% Phase: Waning Gibbous; Moon at 21 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- 243 Pm Pdt Wed Aug 21 2019
.small craft advisory in effect until 9 pm pdt this evening...
Tonight..W winds 15 to 25 kt...decreasing to 10 to 15 kt by midnight.
Thu..SW winds 10 to 15 kt.
Thu night..SW winds 15 to 20 kt with gusts up to 25 kt.
Fri..SW winds 15 to 20 kt with gusts up to 25 kt.
Fri night..SW winds 10 to 15 kt.
Sat..SW winds 10 to 15 kt.
Sat night..SW winds 5 to 10 kt.
Sun..SW winds 10 to 15 kt.
Mon..SW winds 10 to 15 kt.
PZZ500 243 Pm Pdt Wed Aug 21 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds will increase across the coastal waters as high pressure builds over the eastern pacific and low pressure develops over central california. Locally gusty coastal jets are forecast south of point arena, pigeon point, and point sur that will create hazardous seas conditions for smaller vessels. Breezy afternoon and evening winds are also forecast over the san francisco bay as well as over the Monterey bay. Mixed seas will continue with shorter period northwest waves at around 8 to 10 seconds, a light longer period west swell, and a light southerly swell.


7 Day Forecast for Marine Location Near Castro Valley, CA
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location: 37.71, -122.07     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 220026
afdmtr
area forecast discussion
national weather service san francisco bay area
526 pm pdt Wed aug 21 2019

Synopsis High pressure will stall offshore and gradually
strengthen over the course of the next several days. A wind shift
Friday will bring increased onshore flow and cooler temperatures
despite the building ridge. Weekend will be dry with seasonal
temperatures along the coast and somewhat above normal
temperatures inland. A tropical disturbance may bring elevated
moisture and energy over the region later next week.

Discussion As of 02:50 pm pdt Wednesday... California is split
between a cool, moist air mass to the north and warm, dry air mass
to the south. This cool, moist air mass to the north is being
driven by a low pressure trough primarily impacting british
columbia and the pacific northwest, however, the base of this
trough also has dug southward into northern california early this
afternoon in response to the trough axis beginning to move ashore.

Consequently, scattered high clouds arriving from the northwest
are beginning to increase, which may eventually begin to limit
temperatures across the north bay later this afternoon and
evening. Elsewhere, warmer, drier air is settling to the surface
under the broader ridge aloft. 850-500mb temperatures have risen
by roughly 4c over the last 24 hours while temperatures at the
surface are tangibly warmer (+3 to 14 degrees) than the same time
yesterday. The areas seeing the largest day over day temperature
changes so far this afternoon are primarily located in the inland
north and east bay valleys, with concord up 13 degrees (91 vs 78),
santa rosa up 14 degrees (91 vs 77), and livermore up 14 degrees
(91 vs 77). That said, the east bay should end the day warmer than
the north bay given the aforementioned increasing trough
influence through remainder of the day.

For tonight, the marine layer will be under stress by two
competing factors once again, similar to last night. Expect to
continue to see a compressed but existent marine layer over the
monterey bay and into the salinas valley. The bigger unknown is
how the marine layer will in the san francisco bay area following
the departure of the trough to the northeast by tomorrow morning
and a lot of it will come down to the timing of the troughs
departure. A weak marine stratus push into the sf bay would be
possible if the trough exits earlier in the night and a marine
inversion could form, otherwise, it is more likely to see
scattered clouds at variable levels in the low to mid levels
tomorrow morning.

Tomorrow will be similar to day but with less overall trough
influence -- fewer clouds, a compressed marine layer, and slightly
warmer temperatures inland, particularly for the extreme north
bay that will be under some cloud cover today.

Looking ahead, the retrograding ridge will conclude retrograding
westward and anchor itself just along the california baja
california coastline for the coming days. Once anchored, the ridge
is forecast to amplify along the pacific coastline through the
course of the upcoming week -- heralding in gradually increasing
pressure and temperatures a loft. Interestingly enough,
temperatures at the surface will not directly reflect what is
occurring in the atmosphere because of a forecast wind shift to
the southwest scheduled to occur Friday. These southwest winds
will advect in a cooler, moister marine air mass into the inland
on Friday, helping to ease the burden of the strengthen ridge
aloft.

For the weekend, high pressure along the coast will begin to build
onshore and dominate our regional weather. Consequently, dry
weather is expected through the weekend with seasonal
temperatures near the coast and above average (generally 3-10
degrees) temperatures forecast for the inland areas.

Gfs and euro continue to track the potential development of a
tropical disturbance off the southern coast of mexico over the
next few days. Both models suggest the tropical disturbance will
form and begin a northwestward trajectory up offshore of the baja
coastline through this weekend, before falling apart in the less
favorable environment (cooler water) near the calmex border early
next week. Several GFS euro ensemble members split the surface low
from the upper level moisture instability through early next week
and bring into california by mid to late next week. This could
potentially introduce the chance for elevated convection and a
muggier atmosphere if it pans out. Forecast models are likely to
struggle to pin down the specifics of this system until it
eventually forms into a disturbance and falls apart late this
weekend early next weekend. Once this has occurred, there will be
fewer unknowns and we may have a better shot of identifying the
true trajectory of this mid to upper level energy moisture, so
stay tuned!

Aviation As of 5:25 pm pdt Wednesday... Dry northerly flow has
lowered humidities over the area and skies are clear except for
some high clouds. Marine layer has reformed very shallow and not
surprisingly the low clouds are offshore.VFR conditions are
expected in the sfo bay area tonight with CIGS over mry and sns a
little later than usual.

Vicinity of ksfo...VFR. West winds 20 kt gusting to 30 kt
decreasing after 04z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Clouds are still offshore so it will take
some time to develop over mry and sns. The clouds over the ocean
are very low with vsbys as low as 1 4 mile. Ifr CIGS expected
after 06z at mry and 10z at sns after 10z with reduced vsbys
below 3 miles as well.

Marine As of 05:24 pm pdt Wednesday... Northwest winds will
increase across the coastal waters as high pressure builds over
the eastern pacific and low pressure develops over central
california. Locally gusty coastal jets are forecast south of
point arena, pigeon point, and point sur that will create
hazardous seas conditions for smaller vessels. Breezy afternoon
and evening winds are also forecast over the san francisco bay as
well as over the monterey bay. Mixed seas will continue with
shorter period northwest waves at around 8 to 10 seconds, a light
longer period west swell, and a light southerly swell.

Mtr watches warnings advisories
Tngt Sca... Pigeon pt to pt pinos 0-10 nm until 4 am
sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Sf bay until 9 pm
sca... Mry bay until 9 pm
public forecast: drp
aviation: W pi
marine: sims
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
AAMC1 - 9414750 - Alameda, CA 13 mi69 min W 6 G 8.9 73°F 70°F1012.5 hPa (-1.8)
LNDC1 13 mi69 min WSW 8 G 9.9 74°F 1012 hPa (-1.8)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 15 mi69 min SW 8.9 G 11
OBXC1 16 mi69 min 72°F 64°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi69 min W 7 G 8.9 73°F 1011.9 hPa (-2.0)
RTYC1 - 9414523 - Redwood City, CA 16 mi69 min W 16 G 20 79°F 74°F1012.8 hPa (-1.5)
PXSC1 18 mi81 min 74°F 63°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 18 mi75 min WSW 12 G 17 74°F 1011 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 21 mi75 min SSW 7 G 12 70°F 1012 hPa
FTPC1 - 9414290 - San Francisco, CA 22 mi69 min SSW 12 G 20 68°F 62°F1012.3 hPa (-1.7)
UPBC1 23 mi75 min W 13 G 16
MZXC1 - 9415102 - Martinez-Amorco CA 23 mi69 min W 12 G 16 84°F 72°F1010.5 hPa (-2.2)
RCMC1 - 9414863 - Richmond, CA 23 mi69 min SW 1 G 6 74°F 68°F1011.4 hPa (-2.0)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 24 mi52 min SE 4.1 79°F 1011 hPa
PCOC1 - 9415144 - Port Chicago, CA 24 mi69 min WSW 13 G 15 85°F 72°F1010.5 hPa (-2.2)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 25 mi69 min NW 9.9 G 14 84°F 1009.9 hPa (-2.3)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 26 mi69 min SW 12 G 15 78°F 1010.6 hPa (-2.2)
46237 - San Francisco Bar, CA (142) 30 mi69 min 62°F4 ft
SFXC1 - San Francisco Bay Reserve, CA 34 mi84 min W 13 88°F 1010 hPa55°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 41 mi39 min NW 14 G 19 62°F 60°F1013.5 hPa

Wind History for Alameda, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hayward, Hayward Air Terminal, CA4 mi75 minWNW 1210.00 miFair77°F61°F58%1013.1 hPa
Oakland, Metro Oakland International Airport, CA8 mi76 minW 1110.00 miA Few Clouds77°F62°F60%1012.1 hPa
Livermore, Livermore Municipal Airport, CA13 mi76 minW 1310.00 miFair89°F54°F30%1010.8 hPa
San Carlos Airport, CA16 mi82 minW 12 G 1810.00 miClear82°F59°F45%1012.5 hPa
Palo Alto Airport, CA16 mi2.4 hrsNNW 1210.00 miClear84°F57°F40%1012.5 hPa
San Francisco, San Francisco International Airport, CA17 mi73 minW 2310.00 miPartly Cloudy and Windy77°F61°F58%1012 hPa
Concord, Buchanan Field, CA19 mi76 minWSW 1010.00 miFair92°F51°F25%1009.3 hPa
Mountain View, Moffett Field, CA19 mi73 minNNW 1610.00 miFair81°F62°F53%1012.2 hPa

Link to 5 minute data for KHWD

Wind History from HWD (wind in knots)
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Last 24hrW14W12----------SW5--SW3W5------S3NW3CalmW5W7--W9W12W7W12
1 day agoW13W11--------W6W7W6--W6W4W7--W9W6W6W8W10W10W7--W11W11
2 days agoW14W12----W7--W7----CalmNW4W8W8W6--SW7SW6S6SW3--W9NW12
G17
W14W13

Tide / Current Tables for Roberts Landing, 1.3 miles west of, San Francisco Bay, California
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Roberts Landing
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Wed -- 04:39 AM PDT     5.78 feet High Tide
Wed -- 06:29 AM PDT     Sunrise
Wed -- 11:02 AM PDT     1.82 feet Low Tide
Wed -- 12:04 PM PDT     Moonset
Wed -- 05:11 PM PDT     6.74 feet High Tide
Wed -- 07:53 PM PDT     Sunset
Wed -- 11:20 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.33455.65.75.44.63.72.72.11.82.12.94.15.36.36.76.65.94.93.82.82.1

Tide / Current Tables for Oakland Airport SW, South San Francisco Bay, California Current
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Oakland Airport SW
Click for Map
Wed -- 01:42 AM PDT     0.44 knots Max Flood
Wed -- 04:46 AM PDT     -0.00 knots Slack
Wed -- 06:29 AM PDT     Sunrise
Wed -- 07:30 AM PDT     -0.56 knots Max Ebb
Wed -- 10:28 AM PDT     0.00 knots Slack
Wed -- 12:05 PM PDT     Moonset
Wed -- 01:56 PM PDT     0.48 knots Max Flood
Wed -- 05:02 PM PDT     -0.00 knots Slack
Wed -- 07:53 PM PDT     Sunset
Wed -- 08:00 PM PDT     -0.65 knots Max Ebb
Wed -- 11:20 PM PDT     Moonrise
Wed -- 11:32 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.40.40.30.2-0.1-0.3-0.5-0.5-0.3-0.10.10.30.40.50.40.20-0.3-0.5-0.6-0.5-0.3-0.1

Weather Map and Satellite Images
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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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Wind Forecast for San Francisco/Monterey Bay Area, CA (21,6,7,8)
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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.