Tuesday, September26, 2017 L-36.com


Marine Weather and Tides
El Granada, 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 7:01AMSunset 7:00PM Tuesday September 26, 2017 10:57 AM PDT (17:57 UTC) Moonrise 12:04PMMoonset 10:22PM Illumination 35% 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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PZZ545 Point Reyes To Pigeon Point To 10 Nm- 826 Am Pdt Tue Sep 26 2017
Today..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 5 ft at 9 seconds.
Tonight..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 2 to 4 ft at 9 seconds.
Wed..E winds 5 to 15 kt...becoming sw in the afternoon. Wind waves 3 to 5 ft. NW swell 3 to 5 ft at 10 seconds.
Wed night..SW winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft at 10 seconds.
Thu..NW winds 10 kt. Wind waves 2 ft or less. NW swell 2 to 3 ft at 10 seconds.
Fri..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 2 to 4 ft.
Sat..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 3 to 5 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 2 to 4 ft with a dominant swell period 8 seconds. Across the bar...combined seas 3 to 5 ft with a dominant swell period of 8 seconds. Maximum ebb current of 1.3 knots at 08:06 pm Tuesday and 0.5 knots at 08:48 am Wednesday.
PZZ500 826 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... Moderate northwesterly winds will continue into this afternoon over the northern outer waters. A thermal trough over california will shift towards the coast this afternoon decreasing winds across coastal the waters. Expect winds to pick up again heading into the weekend as an upper level trough approaches the pacific northwest Friday.

7 Day Forecast for Marine Location Near El Granada, CA
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location: 37.5, -122.48     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 261728
afdmtr
area forecast discussion
national weather service san francisco bay area
1028 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 bay 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 08:29 am pdt Tuesday... Modest warming trend
will continue over the region today with temperatures running a
few to as much as 7 degrees warmer (at santa rosa airport) than to
24 hours ago. With this, look for coastal locations to warm into
the upper 70s to lower 80s with mid 80s possible around santa
cruz. Inland areas and locations around the san francisco bay will
see afternoon temperatures in the upper 80s to near 90 while
inland areas warm into the mid upper 80s to lower 90s in the north
bay and east bay. Overall, the very warm temperatures will be
mostly uniform through this heat event. Have made a few minor
changes to the forecast this morning, mainly nudging up
temperatures for today and tomorrow as the MOS guidance output is
favored for most locations. Otherwise, clear skies will prevail
region-wide through at least midweek before onshore flow returns
late in the week brining slightly cooler temperatures back inland.

For additional details, please see the previous forecast
discussion below.

Prev 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 10:30 am pdt Tuesday... For 18z tafs. Another
clear day with prevailingVFR conditions expected through the
period. Generally light offshore flow expected this morning before
winds turn westerly this afternoon to around 10 kt.

Vicinity of ksfo...VFR. Generally light winds. Afternoon
westerlies 10-15 kt.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR prevailing with clear skies through
the period.

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 08:29 am pdt Tuesday... Moderate northwesterly
winds will continue into this afternoon over the northern outer
waters. A thermal trough over california will shift towards the
coast this afternoon decreasing winds across coastal the waters.

Expect winds to pick up again heading into the weekend as an
upper level trough approaches the pacific northwest Friday.

Mtr watches warnings advisories
Tday Sca... Pt arena to pigeon pt 10-60 nm until 3 pm
public forecast: rgass rww
aviation: as
marine: as
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 14 mi39 min Calm G 1.9 69°F 68°F1010.8 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 21 mi39 min N 1.9 G 2.9 64°F 1010.2 hPa
FTPC1 - 9414290 - San Francisco, CA 21 mi45 min NNE 1 G 1.9 64°F 62°F1011.6 hPa
PXSC1 21 mi39 min 65°F 61°F
AAMC1 - 9414750 - Alameda, CA 21 mi39 min W 1.9 G 2.9 67°F 67°F1011.7 hPa
46237 - San Francisco Bar, CA (142) 21 mi57 min 61°F3 ft
OBXC1 22 mi39 min 65°F 58°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 22 mi39 min WSW 1.9 G 2.9
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 23 mi67 min NNW 9.7 G 12 61°F 62°F6 ft1010.8 hPa (+0.7)
OKXC1 - 9414776 - Oakland (Berth 34), CA 23 mi39 min NW 1.9 G 2.9 65°F 1011.2 hPa
LNDC1 23 mi39 min SW 1 G 1.9 70°F 1011.2 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 26 mi67 min NNW 3.9 G 3.9 59°F 59°F5 ft1011.4 hPa (+0.8)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 27 mi55 min Calm 68°F 1011 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 29 mi39 min Calm G 1.9 73°F 1011.6 hPa
RCMC1 - 9414863 - Richmond, CA 29 mi45 min SE 1.9 G 2.9 67°F 64°F1011.2 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 40 mi39 min E 9.9 G 12 71°F 1010.9 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 41 mi39 min NE 2.9 G 5.1 69°F 67°F1011.8 hPa51°F
PRYC1 - 9415020 - Point Reyes, CA 43 mi39 min ESE 2.9 G 4.1 71°F 58°F1010.9 hPa
PCOC1 - 9415144 - Port Chicago, CA 45 mi39 min NE 6 G 7 71°F 67°F1011.3 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 49 mi39 min Calm G 1 73°F 1011.4 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA1 mi62 minSSE 47.00 miFair68°F0°F%1010.2 hPa
San Francisco, San Francisco International Airport, CA10 mi61 minN 010.00 miA Few Clouds69°F55°F61%1011.1 hPa
San Carlos Airport, CA12 mi70 minN 010.00 miFair68°F57°F69%1011.5 hPa
Palo Alto Airport, CA19 mi70 minN 010.00 miClear68°F59°F73%1011.5 hPa
Oakland, Metro Oakland International Airport, CA20 mi64 minSW 410.00 miA Few Clouds67°F55°F66%1011.3 hPa
Hayward, Hayward Air Terminal, CA22 mi63 minS 710.00 miFair74°F41°F31%1012 hPa
Mountain View, Moffett Field, CA23 mi61 minNW 310.00 miFair73°F55°F53%1011.7 hPa

Wind History from SFO (wind in knots)
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Last 24hrE4NE3E5E6W11W16W15W17W16W11W8W5W7W5W5W6W5SW3NW3CalmCalmCalmNE3Calm
1 day agoNE3N5NE5E4W16W16W20
G25
W20W14W11W12W9W7W8W3NW3NW5SW5CalmW3CalmCalmCalmNE5
2 days agoN9NE74W13W14W17W23W19W19W14NW10W8W6CalmW6W6SW3S4W3SW3CalmCalmS3NE3

Tide / Current Tables for Princeton, Half Moon Bay, California
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Princeton
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Tue -- 04:11 AM PDT     3.90 feet High Tide
Tue -- 07:01 AM PDT     Sunrise
Tue -- 09:27 AM PDT     2.89 feet Low Tide
Tue -- 01:04 PM PDT     Moonrise
Tue -- 03:12 PM PDT     4.81 feet High Tide
Tue -- 07:00 PM PDT     Sunset
Tue -- 10:20 PM PDT     0.96 feet Low Tide
Tue -- 11:22 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
22.63.33.73.93.83.63.33.12.92.93.23.64.14.64.84.74.23.52.71.81.311

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 (13,3,4,5)
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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.