Sunday, May26, 2019 L-36.com


Marine Weather and Tides
Piedmont, CA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 5:49AMSunset 8:21PM Saturday May 25, 2019 9:13 PM PDT (04:13 UTC) Moonrise 12:26AMMoonset 10:55AM Illumination 54% Phase: Third Quarter Moon; Moon at 22 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- 854 Pm Pdt Sat May 25 2019
.small craft advisory in effect through Sunday afternoon...
Tonight..W winds 15 to 25 kt with gusts up to 30 kt.
Sun..W winds 15 to 25 kt with gusts up to 35 kt. A chance of rain.
Sun night..W winds 5 to 15 kt.
Memorial day..SW winds 10 to 20 kt with gusts up to 25 kt.
Mon night..SW winds 10 to 20 kt with gusts up to 25 kt.
Tue..SW winds 10 to 20 kt with gusts up to 25 kt.
Wed..SW winds 5 to 15 kt.
PZZ500 854 Pm Pdt Sat May 25 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Gusty northwest winds will continue through the night and into Sunday, with gale-force winds over the northern outer waters tonight. Scattered showers and isolated Thunderstorms are possible beginning early Sunday morning. Moderate northwest swell will continue through the weekend with steep choppy seas generated by the gusty winds.


7 Day Forecast for Marine Location Near Piedmont, CA
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location: 37.85, -122.22     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 260408
afdmtr
area forecast discussion
national weather service san francisco bay area
908 pm pdt Sat may 25 2019

Synopsis Rain showers will develop after midnight as an
cold weather system moves in from the north. In addition gusty
west to northwest winds will develop near the coast after
midnight. Showers and isolated thunderstorms are forecast for
Sunday along with unseasonably cool daytime temperatures. Dry but
cool conditions are forecast for memorial day. A gradual warming
trend is expected early next week with temperatures expected to
return to near normal by midweek.

Discussion As of 9:05 pm pdt Saturday... An unseasonably cold
upper low is currently centered just off the coast of central
oregon. A frontal boundary moving out ahead of the low center is
already spreading rain into northern california as far south as
mendocino county. Based on latest model data, rain in our area is
forecast to begin late tonight, but extrapolation of satellite and
radar data would bring rain into our area as early as midnight.

In any event, expect shower activity to develop overnight as the
initial boundary moves through. In addition, west to northwest
winds are expected to increase around midnight and become locally
gusty in the early morning hours of Sunday, mainly in coastal
areas. Gusts up to 40 mph are possible near the ocean and through
coastal gaps from about 2 am until mid morning. Winds are expected
to subside by late Sunday morning.

Scattered showers will continue through the day Sunday as the cold
upper low tracks south directly across the bay area. Isolated
thunderstorms are a definite possibility on Sunday considering
the combination of an unseasonably cold airmass aloft and strong
surface heating due to the late may Sun angle. The 00z nam
forecasts 500 mb temperatures to drop as low as minus 28 deg c by
early Sunday afternoon - a temperature that would be considered
quite cold for mid winter. The cold air aloft will also likely
mean small hail in some of the heavier showers and isolated
thunderstorms.

High temperatures on Sunday are forecast to mostly range from the
mid 50s to mid 60s... With cooler readings expected in the hills.

These temperatures will be as much as 20 degrees cooler than
normal for late may. Snow levels are projected to drop as low as
4500 feet on Sunday and so light snowfall accumulation is possible
on the higher peaks and ridges of the santa lucia mountains in
monterey county. There may even be brief light snow at the summit
mount hamilton in the bay area.

Precipitation is expected to taper off from north to south during
the late afternoon and evening hours of Sunday as the upper low
moves off to our southeast. Nearly all shower activity is expected
to end by midnight Sunday night. Rainfall totals with this system
are forecast to be a quarter inch or less in most locations.

However, some locations in the southern half of our forecast area
could see as much as a half inch, and even locally more in the
southern diablo range or santa lucias.

The upper low is forecast to be centered near las vegas by late
Sunday night and no longer pose a threat for precipitation in our
area. Therefore, memorial day is expected to be a dry day across
our region. Temperatures will begin to moderate on Monday, but
still be much cooler than seasonal averages.

Gradual warming is expected during the first half of next week as
the longwave trough position shifts to our east. Temperatures may
climb back close to normal by midweek. Longer range models
maintain dry weather through the end of next week and into next
weekend with temperatures remaining near, to slightly below,
normal.

Aviation As of 05:25 pm pdt Saturday... Marine stratus covers
much of the coast south of san francisco, otherwise skies are
clear to partly cloudy.VFR conditions currently prevail at all
sf bay area terminals, while MVFR ceiling onset has already
occurred at kmry and ksns. Very unusual weather circumstances for
this time of year to be developing late tonight into Sunday, as a
cold winter-like upper low plunges southward into our area. It
will bring gusty onshore winds, periods of -shra and shra, and
even a possibility of some thunderstorms and small hail. Primary
impacts look to be south of san francisco during the day on
Sunday.

Vicinity of ksfo...VFR conditions with moderately strong and gusty
onshore winds are forecast to continue through the evening rush,
but can't completely rule out the possibility of an earlier
short-lived MVFR cloud deck spilling through the gap into the
terminal area. With the approaching storm system, expect winds to
actually increase significantly out of the west during the late
night and morning hours, becoming strong and gusty, along with
developing rain showers.

Sfo bridge approach... Similar to ksfo, though more confident the
approach will remain clear through the evening hours than the
terminal itself.

Monterey bay terminals... MVFR ceilings are expected to prevail
through the night and into Wednesday morning. Risk of lowering to
ifr however is considered to be pretty low. With the approaching storm
system, expect winds to strengthen out of the west during the late
night and morning hours, becoming moderately strong and gusty,
along with developing rain showers.

Marine As of 8:54 pm pdt Saturday... Gusty northwest winds will
continue through the night and into Sunday, with gale-force winds
over the northern outer waters tonight. Scattered showers and
isolated thunderstorms are possible beginning early Sunday
morning. Moderate northwest swell will continue through the
weekend with steep choppy seas generated by the gusty winds.

Mtr watches warnings advisories
Tngt Sca... Sf bay from 9 pm
sca... Mry bay from 9 pm
sca... Pigeon pt to pt pinos 0-10 nm from 9 pm
sca... Pt pinos to pt piedras blancas 0-10 nm from 9 pm
glw... Pt arena to pigeon pt 10-60 nm until 3 am
sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Rough bar advisory for sf bar
public forecast: dykema
aviation: blier
marine: blier
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LNDC1 5 mi43 min SW 11 G 13 55°F 1009.7 hPa
AAMC1 - 9414750 - Alameda, CA 7 mi49 min WSW 13 G 17 55°F 64°F1010.3 hPa
OBXC1 7 mi43 min 56°F 52°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 7 mi43 min WSW 7 G 11 56°F 1009.6 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 7 mi49 min SW 12 G 14
PPXC1 - 9414847 - Richmond (Point Potrero), CA 9 mi43 min S 20 G 22 56°F 1009.1 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 10 mi43 min SE 2.9 G 9.9 55°F 1008.4 hPa
PXSC1 10 mi43 min 56°F 51°F
RCMC1 - 9414863 - Richmond, CA 11 mi49 min SSE 11 G 15 57°F 60°F1008.5 hPa
FTPC1 - 9414290 - San Francisco, CA 13 mi49 min WSW 8.9 G 14 54°F 57°F1009.5 hPa
UPBC1 14 mi43 min WSW 7 G 12
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 14 mi43 min SSW 12 G 18 58°F 1007.8 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 14 mi49 min S 7 G 13 59°F 63°F1008 hPa49°F
PCOC1 - 9415144 - Port Chicago, CA 17 mi43 min SW 13 G 18 59°F 63°F1008 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 22 mi49 min W 12 G 20 60°F 1007 hPa
46237 - San Francisco Bar, CA (142) 22 mi73 min 58°F6 ft
RTYC1 - 9414523 - Redwood City, CA 24 mi43 min WSW 7 G 11 56°F 67°F1010.3 hPa
SFXC1 - San Francisco Bay Reserve, CA 26 mi88 min WSW 8 61°F 1008 hPa48°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 33 mi43 min WNW 19 G 23 54°F 56°F1010.2 hPa
PRYC1 - 9415020 - Point Reyes, CA 41 mi43 min 55°F1009 hPa

Wind History for Oakland Middle Harbor, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA10 mi20 minWSW 1510.00 miMostly Cloudy57°F48°F74%1010.1 hPa
Concord, Buchanan Field, CA13 mi20 minS 1510.00 miFair59°F46°F62%1006.6 hPa
Hayward, Hayward Air Terminal, CA14 mi19 minWSW 1010.00 miMostly Cloudy56°F46°F72%1010.7 hPa
San Francisco, San Francisco International Airport, CA18 mi17 minSW 1810.00 miMostly Cloudy and Breezy56°F46°F72%1009.8 hPa
San Carlos Airport, CA22 mi26 minSSW 79.00 miPartly Cloudy55°F48°F77%1010.2 hPa
Livermore, Livermore Municipal Airport, CA24 mi20 minW 119.00 miFair54°F46°F77%1008.9 hPa

Wind History from OAK (wind in knots)
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Last 24hrW13SW7W12W11SW16SW11SW14SW13W14W12W11SW4SW9S73W8W9W7W14W15W13W10W15W15
1 day agoW9SW8SW8SW7SW7SW11
G19
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2 days agoW10W7W5W3Calm3SW13SW5SW11SW8SW7SW9SW5SW5SW45W66NW12W13W11W10W12W11

Tide / Current Tables for Berkeley, San Francisco Bay, California
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Oakland Harbor WebStreeter Street, San Francisco Bay, California Current
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Oakland Harbor WebStreeter Street
Click for Map
Sun -- 01:01 AM PDT     0.00 knots Slack
Sun -- 01:59 AM PDT     Moonrise
Sun -- 03:31 AM PDT     0.35 knots Max Flood
Sun -- 05:51 AM PDT     Sunrise
Sun -- 06:03 AM PDT     -0.00 knots Slack
Sun -- 09:04 AM PDT     -0.85 knots Max Ebb
Sun -- 09:34 AM PDT     Last Quarter
Sun -- 12:52 PM PDT     Moonset
Sun -- 01:10 PM PDT     0.00 knots Slack
Sun -- 04:40 PM PDT     0.76 knots Max Flood
Sun -- 07:47 PM PDT     -0.00 knots Slack
Sun -- 08:21 PM PDT     Sunset
Sun -- 10:07 PM PDT     -0.55 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.2-00.20.30.30.20-0.3-0.7-0.8-0.8-0.6-0.4-0.10.30.60.70.70.60.3-0.1-0.4-0.5-0.5

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 (0,6,7,8)
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Ground Weather Radar Station Sacramento, 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.