Tuesday, September26, 2017 L-36.com


Marine Weather and Tides
Belmont, CA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
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.

Sunrise 7:00AMSunset 6:59PM Tuesday September 26, 2017 7:23 AM PDT (14:23 UTC) Moonrise 12:04PMMoonset 10:21PM Illumination 34% Phase: Waxing Crescent; Moon at 6 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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PZZ531 San Francisco Bay South Of The Bay Bridge- 251 Am Pdt Tue Sep 26 2017
Today..NW winds 5 to 15 kt.
Tonight..NW winds 5 to 15 kt.
Wed..NW winds 10 kt.
Wed night..NW winds 5 to 15 kt.
Thu..W winds 5 to 15 kt.
Fri..W winds 10 kt.
Sat..NW winds 5 to 15 kt.
PZZ500 251 Am Pdt Tue Sep 26 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A thermal trough over the california interior will shift to the coast resulting in decreasing winds. An upper level trough will approach the pacific northwest Friday increasing the pressure gradients over the area.

7 Day Forecast for Marine Location Near Belmont, CA
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location: 37.52, -122.28     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 261143
afdmtr
area forecast discussion
national weather service san francisco bay area
443 am pdt Tue sep 26 2017

Synopsis Breezy in the hills this morning then turning sunny
and warm to hot again by midday. Another shot of gusty winds again
this evening for the north and east bay hills. Continued warm and
dry on Wednesday which may be the hottest day this week but with
winds easing. Onshore flow gradually returns by Thursday with a
few degrees of cooling followed by more noted cooling Friday and
Saturday as a trough passes to our north. Dry high pressure
rebuilds Sunday into next week.

Discussion As of 3:37 am pdt Tuesday... Skies remain mostly
clear this morning with mild overnight lows around 60 most areas.

Surface gradients currently show a 6 mb pressure gradient down the
coast form arcata to sfo which is a dry northerly flow. The large
scale offshore from the deserts is around 7-8 mb which is only
moderate. This is translating to some gusty winds in the north and
east bay hills with hawkeye in northern sonoma currently gusting
28 mph with 19 mph on mt tamalpais. This all sets the stage for
rapid warming again today as the Sun comes up and the dry airmass
quickly warms up under adiabatic compression off the coastal
hills. The official forecast for today has widespread 80s and 90s
across the bay area.

Models show another shot of east northeast winds in the hills this
evening which will keep fire weather concerns in place due to poor
humidity recovery, mild temps and continued dry offshore winds.

Winds will finally ease on Wednesday but another warm to hot day
is forecast across the region.

Some coastal cooling should become obvious by Thursday as onshore
flow gradually returns to area but inland areas will remain above
normal once again.

The ECMWF nows brings a dry cold front over the bay area by
Friday. This should induce some gusty onshore winds and a possible
return of the marine layer into Saturday. The pattern looks
progressive with high pressure rebuilding by Sunday into early
next week with another thermal trough setting up at the surface.

This should translate too another round of sunny and mild days for
early next week before the next trough knocks temps back down a
few degrees.

Aviation As of 4:45 am pdt Tuesday... Dry offshore winds
supportVFR through Tuesday.

Vicinity of ksfo...VFR.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR.

Fire weather As of 3:37 am pdt Tuesday... Red flag warnings
remain in place for the north and east bay hills into weds.

Humidity remains below 30 percent early this morning with dry
north winds showing up in the hills. Winds forecast to ease
through the daytime hours today but another warm and dry day.

Models show another shot of gusty east northeast winds by this
evening and overnight, strongest in the napa hills. Latest fuels
analysis shows that fuels are around normal in terms of seasonable
dryness but of course this is the driest time of year. However
trend of warmer and drier will continue to dry out the fine and
live fuels. Winds will finally ease on Wednesday but that may be
the hottest and driest day this week. Will need to watch for
return of onshore winds Thursday afternoon for the interior
valleys. Breezy onshore winds Friday and Saturday then warming and
drying again Sunday into early next week.

Marine As of 3:00 am pdt Tuesday... A thermal trough over the
california interior will shift to the coast resulting in
decreasing winds. An upper level trough will approach the pacific
northwest Friday increasing the pressure gradients over the area.

Mtr watches warnings advisories
Tday Sca... Pt arena to pigeon pt 10-60 nm until 3 pm
public forecast: rww
aviation: W pi
marine: W pi
fire weather: rww
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 4 mi54 min ESE 2.9 G 2.9 60°F 68°F1010.2 hPa
AAMC1 - 9414750 - Alameda, CA 17 mi54 min ESE 1 G 2.9 62°F 67°F1011.1 hPa
LNDC1 19 mi54 min S 1 G 5.1 62°F 1010.6 hPa
OBXC1 20 mi54 min 63°F 60°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 20 mi54 min Calm G 1.9 62°F 1009.5 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 20 mi54 min Calm G 1.9 62°F 1010.6 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 20 mi54 min S 1.9 G 1.9
PXSC1 21 mi54 min 62°F 58°F
FTPC1 - 9414290 - San Francisco, CA 22 mi54 min S 1.9 G 2.9 59°F 61°F1010.9 hPa
46237 - San Francisco Bar, CA (142) 26 mi54 min 60°F3 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 27 mi67 min Calm 61°F 1010 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 27 mi54 min E 1.9 G 4.1 64°F 1010.8 hPa
RCMC1 - 9414863 - Richmond, CA 29 mi54 min Calm G 1.9 63°F 64°F1010.5 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 34 mi94 min WSW 1.9 G 3.9 58°F 58°F5 ft1010.2 hPa (-0.0)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 34 mi94 min N 9.7 G 12 60°F 62°F6 ft1009.8 hPa (-0.0)
MZXC1 - 9415102 - Martinez-Amorco CA 37 mi54 min SSE 1.9 G 2.9 62°F 67°F1011 hPa52°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 37 mi54 min SSE 1.9 G 1.9 62°F 1010.3 hPa
PCOC1 - 9415144 - Port Chicago, CA 39 mi54 min SSW 6 G 8 60°F 67°F1010.5 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 42 mi54 min Calm G 1 64°F 1010.3 hPa
PRYC1 - 9415020 - Point Reyes, CA 49 mi54 min Calm G 1 61°F 58°F1010.4 hPa
SFXC1 - San Francisco Bay Reserve, CA 49 mi99 min SSE 2.9 58°F 1010 hPa55°F

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Carlos Airport, CA2 mi29 minN 010.00 miFair59°F50°F72%1011.2 hPa
San Francisco, San Francisco International Airport, CA8 mi28 minN 010.00 miPartly Cloudy61°F48°F65%1010.7 hPa
Half Moon Bay Airport, CA12 mi29 minN 06.00 miFair with Haze48°F0°F%1009.8 hPa
Hayward, Hayward Air Terminal, CA13 mi30 minENE 510.00 miFair59°F39°F48%1011.7 hPa
Oakland, Metro Oakland International Airport, CA13 mi31 minENE 310.00 miA Few Clouds55°F46°F74%1010.8 hPa
Mountain View, Moffett Field, CA14 mi28 minN 010.00 miFair59°F48°F69%1011.4 hPa
San Jose, San Jose International Airport, CA21 mi31 minS 310.00 miA Few Clouds59°F43°F56%1010.8 hPa

Wind History from SQL (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmW4--NW4NW6W12W15NW7NW5CalmS3CalmCalmCalmCalmCalmCalmS3Calm
1 day agoCalmCalmE3Calm3N4NW7N7NW6NW12W12
G17
W11W8W6NW3CalmCalmN4SW4CalmNW5SW3CalmCalm
2 days agoCalmCalm------N12
G16
NW11NW9
G14
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G16
W14
G19
W9W9W9CalmCalmCalmCalmS4CalmCalmCalmCalmCalmSW3

Tide / Current Tables for Smith Slough, San Francisco Bay, California
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Smith Slough
Click for Map
Tue -- 12:08 AM PDT     0.88 feet Low Tide
Tue -- 06:32 AM PDT     6.30 feet High Tide
Tue -- 07:00 AM PDT     Sunrise
Tue -- 12:15 PM PDT     2.89 feet Low Tide
Tue -- 01:03 PM PDT     Moonrise
Tue -- 05:33 PM PDT     7.21 feet High Tide
Tue -- 06:59 PM PDT     Sunset
Tue -- 11:21 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.91.22.13.34.65.66.26.25.84.943.32.93.13.856.27.17.26.75.74.53.22

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
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San Mateo Bridge
Click for Map
Tue -- 12:29 AM PDT     0.00 knots Slack
Tue -- 03:13 AM PDT     1.26 knots Max Flood
Tue -- 06:56 AM PDT     -0.01 knots Slack
Tue -- 07:00 AM PDT     Sunrise
Tue -- 09:28 AM PDT     -0.77 knots Max Ebb
Tue -- 12:32 PM PDT     0.00 knots Slack
Tue -- 01:03 PM PDT     Moonrise
Tue -- 03:05 PM PDT     0.86 knots Max Flood
Tue -- 06:13 PM PDT     -0.00 knots Slack
Tue -- 06:59 PM PDT     Sunset
Tue -- 09:46 PM PDT     -1.32 knots Max Ebb
Tue -- 11:21 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.30.411.21.210.5-0-0.5-0.7-0.7-0.5-0.20.20.60.90.80.50.1-0.3-0.8-1.2-1.3-1

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 (10,2,3,4)
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Ground Weather Radar Station San Francisco Bay Area, 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.