Thursday, March30, 2017 L-36.com


Marine Weather and Tides
Piedmont, CA

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:53AMSunset 7:32PM Thursday March 30, 2017 5:33 PM PDT (00:33 UTC) Moonrise 7:55AMMoonset 9:46PM Illumination 13% Phase: Waxing Crescent; Moon at 3 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 San Francisco Bay North Of The Bay Bridge- 244 Pm Pdt Thu Mar 30 2017
.small craft advisory in effect through Friday afternoon...
Tonight..NW winds 15 to 25 kt.
Fri..N winds 15 to 25 kt.
Fri night..NW winds 10 to 20 kt.
Sat..N winds 5 to 15 kt.
Sat night..NW winds 10 kt.
Sun..S winds 10 kt...becoming west 10 to 20 kt.
Mon..NW winds 5 to 15 kt.
Tue..W winds 10 kt.
PZZ500 244 Pm Pdt Thu Mar 30 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Strong and gusty northwest winds will persist over the coastal waters through at least Friday...potentially extending into the weekend across the offshore waters. Northwest swell will level off while swell periods steadily decrease through tonight. Large and very long period northwesterly swell will return to the coastal waters late Saturday night that will last through the weekend.

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 302344
afdmtr
area forecast discussion
national weather service san francisco bay area
444 pm pdt Thu mar 30 2017

Synopsis Gusty northerly winds are likely from Thursday afternoon
into Friday. Winds will decrease Friday afternoon with a warming
trend for the upcoming weekend as high pressure rebuilds over the
region.

Discussion As of 02:39 pm pdt Thursday... Noticeable change
across the bay area today as a cold front swept through the region
earlier today. As mentioned on previous discussions the front was
mostly dry, but a few automated gauges did measure some light
precip. Over the last 12 hours the highest precip totals fell
over the hills/mts with just a tad over a tenth of an inch. The
frontal passage also had some very strong gust with a few peaks
hitting 50 mph this morning, but winds subsided. The more
impactful change is developing behind the front, stronger winds
and colder temps. The 24 hour temp change indicates many locations
around the region are running about five to eight degrees colder
than yesterday as this time.

For the rest of the day and tonight, the northerly gradient will
continue to increase. The sfo-acv gradient is almost at 6 mb,
which is up 4 mb from this morning. The increasing northerly
gradient will result in very strong northerly winds. We had the
brief surge in winds this morning with the fropa, but this
afternoon and tonight will be more widespread strong winds for a
longer duration. The latest hi-res models initially develop strong
winds along the coast this afternoon and then over the hills
tonight and tomorrow. The local WRF has 925 mb (~2500 ft) winds of
45-50kt winds 03-18z Friday. All that being said, a wind advisory
remains in effect for portions of the coast through 8 pm this
evening and the hills from midnight tonight through 12 pm. It
should also be noted that the direction is northerly, which is
different than most other wind events earlier this year.

Therefore, trees that may have been sheltered could be more
exposed with the northerly winds. Winds will gradually diminish
later on Friday, but still remain breezy in the hills.

Temperatures rebound a little on Friday as h5 rise, 850mb temps
warm and the northerly gradient weakens.

Additional warming is expected this weekend with pleasant weather.

Saturday appears to be the warmest day with highs in the 70 and
80s... A few 60s along the immediate coast. To put this in context,
highs on Saturday could be 10 to 15 deg above normal for early
april. A slight cooldown on Sunday as patchy stratus returns with
the breakdown of the ridge.

Quiet continues early next week with relatively flat flow aloft
with moderating temperatures, but dry conditions. The extended
forecast is definitely low confidence as model guidance is all
over the place regarding precip next week. Some of the latest
model guidance is dry while others are wet. For now, did trend
drier and keep most rain chances over the north bay next Wed into
thur.

Aviation As of 4:40 pm pdt Thursday for 00z tafs.VFR
conditions are expected to prevail across terminals over the next
24 to 30 hours. Breezy northwest winds have been observed this
afternoon with many locations reporting sustained winds in excess
of 20 kt and gusts hovering around 30 kt. Wind speeds are expected
to decrease and gusts become less frequent after sunset and as
the night progresses. Models suggest another windy day in store
for Friday with gusts again exceeding 25 kt by the afternoon.

High confidence with cigs; moderate confidence with winds and
timing.

Vicinity of ksfo...VFR conditions expected. Gusty northwest winds
are expected to continue into the evening hours. Several
wind gust observations have exceeded 30 kt. While it is possible
gusts may exceed 35 kt, confidence remains low. Thus, will closely
monitor wind speeds and gusts through into the evening
for the potential/need for an airport weather warning. Wind
sfo bridge approach... Similar to ksfo.

Monterey bay terminals..Vfr conditions expected. Breezy and gusty
west to northwest winds at 15 to 20 kt with gusts 25 to 30 kt
will continue into the evening hours.

Marine As of 10:35 am pdt Thursday... Northwest winds will
remain strong and gusty in wake of a frontal passage earlier this
morning. Surface high pressure will build over far northern
california resulting in gale force winds over the coastal waters
through at least Friday. Northwest swell will level off while
swell periods steadily decrease today. Large and very long period
northwesterly swell will return to the coastal waters late
Saturday night that will last through the weekend.

Mtr watches/warnings/advisories
Tngt Wind advisory... Coastal areas 12pm Thu to 8pm thu.

Inland elevated terrain 12am fri
until 12pm fri.

Sca... Pt arena to pt reyes 0-10 nm until 5 pm
sca... Pt reyes to pigeon pt 0-10 nm until 5 pm
sca... Pigeon pt to pt pinos 0-10 nm until 5 pm
sca... Pt pinos to pt piedras blancas 0-10 nm until 5 pm
sca... Pt arena to pigeon pt 10-60 nm until 5 pm
sca... Pigeon pt to pt piedras blancas 10-60 nm until 5 pm
glw... Pt arena to pt reyes 0-10 nm
glw... Pt reyes to pigeon pt 0-10 nm
glw... Pigeon pt to pt pinos 0-10 nm
glw... Pt pinos to pt piedras blancas 0-10 nm
glw... Pt arena to pigeon pt 10-60 nm
glw... Pigeon pt to pt piedras blancas 10-60 nm
sca... Sf bay
sca... Mry bay
public forecast: mm
aviation: rowe
marine: rgass
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LNDC1 5 mi51 min W 12 G 16 61°F 1017.1 hPa
OBXC1 7 mi45 min 59°F 47°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 7 mi45 min W 15 G 18
OKXC1 - 9414776 - Oakland (Berth 34), CA 7 mi45 min W 13 G 17 59°F 1017.1 hPa
AAMC1 - 9414750 - Alameda, CA 7 mi45 min W 8 G 14 60°F 60°F1017.5 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 9 mi45 min WNW 17 G 24 62°F 1016.8 hPa
PXSC1 10 mi45 min 60°F 46°F
RCMC1 - 9414863 - Richmond, CA 11 mi45 min NW 18 G 21 1016.6 hPa
FTPC1 - 9414290 - San Francisco, CA 13 mi45 min W 12 G 20 1017.4 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 14 mi45 min WNW 13 G 16 61°F 1016.5 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 14 mi45 min W 14 G 16 61°F 58°F1016.8 hPa46°F
UPBC1 14 mi45 min WNW 16 G 19
PCOC1 - 9415144 - Port Chicago, CA 17 mi45 min W 15 G 17 62°F 58°F1016.3 hPa
46237 - San Francisco Bar, CA (142) 22 mi63 min 54°F8 ft
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 22 mi45 min NNE 19 G 21 65°F 1015.8 hPa
RTYC1 - 9414523 - Redwood City, CA 24 mi45 min W 21 G 26 58°F 62°F1017.2 hPa
SFXC1 - San Francisco Bay Reserve, CA 26 mi108 min NE 13 67°F 1017 hPa38°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 33 mi43 min NW 23 G 27 53°F 53°F11 ft1018.4 hPa (-2.1)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 49 mi43 min NW 27 G 33 54°F 55°F11 ft1017.9 hPa (-1.9)

Wind History for Oakland Middle Harbor, CA
(wind in knots)    EDIT      (on/off)   Help
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W7
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA10 mi40 minW 198.00 miA Few Clouds and Breezy64°F46°F54%1016.9 hPa
Concord, Buchanan Field, CA13 mi40 minW 1410.00 miFair66°F43°F43%1014.9 hPa
Hayward, Hayward Air Terminal, CA14 mi39 minWNW 169.00 miA Few Clouds63°F45°F52%1017.8 hPa
San Francisco, San Francisco International Airport, CA18 mi37 minW 26 G 3410.00 miA Few Clouds and Windy59°F44°F58%1017.5 hPa
San Carlos Airport, CA22 mi46 minW 17 G 2210.00 miA Few Clouds59°F41°F51%1017.6 hPa
Livermore, Livermore Municipal Airport, CA24 mi40 minW 1110.00 miA Few Clouds64°F43°F46%1015.8 hPa

Wind History from OAK (wind in knots)
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Last 24hrW13
G29
W16W13W14W12W11W12W10W8W19W20W21W25W18W16NW11
G20
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1 day agoW13W11NW5NW7CalmNW3W3CalmNE4NE3NE4CalmCalmE4CalmSE4S4SW6SW7W14W8W12W14SW7
2 days agoW14W15N8NW9NW10NW11N8NW5NW4W5CalmCalmN3NW3N3NW5NW7W11W10NW12NW13W13W16W12

Tide / Current Tables for Berkeley, San Francisco Bay, California
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Berkeley
Click for Map
Thu -- 02:02 AM PDT     6.18 feet High Tide
Thu -- 06:56 AM PDT     Sunrise
Thu -- 08:28 AM PDT     -0.27 feet Low Tide
Thu -- 08:55 AM PDT     Moonrise
Thu -- 02:57 PM PDT     5.23 feet High Tide
Thu -- 07:30 PM PDT     Sunset
Thu -- 08:33 PM PDT     1.27 feet Low Tide
Thu -- 10:45 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.85.86.25.94.93.41.80.5-0.2-0.20.51.62.94.14.95.24.94.1321.41.31.93

Tide / Current Tables for Oakland Harbor WebStreeter Street, San Francisco Bay, California Current
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Oakland Harbor WebStreeter Street
Click for Map
Thu -- 01:58 AM PDT     -0.00 knots Slack
Thu -- 04:58 AM PDT     -1.47 knots Max Ebb
Thu -- 06:56 AM PDT     Sunrise
Thu -- 08:29 AM PDT     0.01 knots Slack
Thu -- 08:55 AM PDT     Moonrise
Thu -- 11:43 AM PDT     1.19 knots Max Flood
Thu -- 02:58 PM PDT     -0.01 knots Slack
Thu -- 05:27 PM PDT     -1.07 knots Max Ebb
Thu -- 07:30 PM PDT     Sunset
Thu -- 08:37 PM PDT     0.00 knots Slack
Thu -- 10:45 PM PDT     Moonset
Thu -- 11:49 PM PDT     0.97 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.90.5-0-0.7-1.3-1.5-1.3-0.8-0.30.30.81.11.210.5-0-0.6-1-1-0.7-0.30.20.60.9

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 (20,4,5,8)
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Ground Weather Radar Station Sacramento, 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.