Saturday, August19, 2017 L-36.com


Marine Weather and Tides
Moss Beach, 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 6:29AMSunset 7:57PM Saturday August 19, 2017 4:01 AM PDT (11:01 UTC) Moonrise 3:09AMMoonset 5:37PM Illumination 8% Phase: Waning Crescent; Moon at 27 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- 252 Am Pdt Sat Aug 19 2017
Today..SW winds 10 kt. Wind waves 2 ft or less. Mixed swell nw 3 to 5 ft at 10 seconds and S 3 ft at 15 seconds. Patchy fog in the morning.
Tonight..SW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 5 ft at 10 seconds. Patchy fog after midnight.
Sun..S winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 4 to 6 ft at 10 seconds. Patchy fog in the morning.
Sun night..S winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 4 to 6 ft at 10 seconds. Patchy fog after midnight.
Mon..SW winds 10 kt. Wind waves 2 ft or less. NW swell 4 to 6 ft at 10 seconds. Patchy fog in the morning.
Tue..W winds 10 kt. Wind waves 2 ft or less. NW swell 2 to 4 ft.
Wed..W winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 2 to 3 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 4 to 5 ft with a dominant swell period of 10 seconds. Across the bar...combined seas 4 to 6 ft with a dominant swell period of 10 seconds. Maximum ebb current of 1 knots at 02:24 pm Saturday and 1.9 knots at 02:00 am Sunday.
PZZ500 252 Am Pdt Sat Aug 19 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate, occasionally gusty, northwest winds will prevail across the waters through tonight as high pressure builds in from the west. Locally steep wind waves will also accompany increasing winds.

7 Day Forecast for Marine Location Near Moss Beach CDP, CA
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location: 37.51, -122.56     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 191010
afdmtr
area forecast discussion
national weather service san francisco bay area
310 am pdt Sat aug 19 2017

Synopsis A few degrees of cooling are expected over the
weekend and into early next week as an approaching trough of low
pressure weakens the area of high pressure currently over the
eastern pacific. Coastal areas will see little in the way of
change with continue night and morning low clouds and patchy fog.

Discussion As of 3:05 am pdt Saturday... Widespread low cloud
will encompass area across the forecast area located below the
1500 ft inversion currently in place. Satellite imagery reveals
stratus from cloverdale in northern sonoma to as far south as
bradley in southern monterey county. Low clouds are anticipated to
clear to the coast by noon followed by mostly sunny skies across
the interior through the remainder of the day.

Temperatures will cool a few degrees inland this afternoon
compared to Friday as an upper level low forms over point
conception resulting in a steep decline in 500mb height and 850mb
temperature values. Little if any change is expected along the
coast where low clouds will help moderate the temperature.

Anticipate 60s along the coast, 70s around the bay and 80s and 90s
inland. Temperatures will continue to cool a few degrees per day
on Sunday and Monday. The upper low will remain centered over
point conception through Tuesday before gradually weakening and
shifting to the north and east. Temperatures are forecast to
flattening out on Tuesday with very little change expected through
the remainder of the week.

From previous discussion... For Monday morning's solar eclipse...

if conditions permit, the partial solar eclipse can be viewed
throughout california. Right now, models are all in good agreement
that the upper level low will remain parked near point conception
in southern california. For us along the central coast and north
to the san francisco bay area, this yields a few outcomes. For
one, the low can help mix out the marine layer, resulting in
mostly clear conditions. On the other hand, the upper low could
help to enhance the marine layer depth. We'll know a little bit
more over the weekend and will continue to monitor the marine
layer's response to the trough. Climatologically, the best
locations in the bay area for clear skies on a mid late august
morning would be interior areas of the east bay away from the
coast, as well as the higher elevations in the santa cruz
mountains, north bay mountains, and diablo range. The eclipse of
the Sun will begin shortly after 9:00 am pdt for the bay area with
peak obscuration happening around 10:15 am pdt. Peak obscuration
of the Sun will range from 71 percent in monterey and up to 78
percent in santa rosa.

Aviation As of 10:55 pm pdt Friday... Clouds have returned to
all coastal areas and are now expanding inland. With a surface
west-to-east gradient over 3 mb should see it continue overnight
although complicating matters is local WRF is not in good
agreement with satellite and obs. Regardless, CIGS will likely
vary from 006 to 010 most of the night. Return toVFR by tomorrow
mid to late morning. Moderate to high confidence.

Vicinity of ksfo...VFR conditions expected to continue the next
few hours with CIGS to around 010 starting close to 09z.VFR
forecast to return close to 17z. Winds will remain under 12 kt
until 19-20z with gusts to 20 kt possible Saturday afternoon.

Moderate to high confidence.

Sfo bridge approach... Similar to ksfo although sct deck could
impact approach as early as 07z.

Monterey bay terminals... CIGS between 006-010 through the rest of
the night withVFR conditions forecast to return toVFR around
17-18z. Winds will stay under 12kt through at least 18z. Moderate
to high confidence.

Marine As of 2:52 am pdt Saturday... Moderate, occasionally
gusty, northwest winds will prevail across the waters through
tonight as high pressure builds in from the west. Locally steep
wind waves will also accompany increasing winds.

Mtr watches warnings advisories
Tday Sca... Pt arena to pigeon pt 10-60 nm
sca... Sf bay from 9 am
public forecast: cw
aviation: bell
marine: drp
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 18 mi43 min NNW 2.9 G 2.9 62°F 73°F1012.6 hPa
46237 - San Francisco Bar, CA (142) 19 mi61 min 59°F4 ft
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 20 mi71 min WSW 1.9 G 1.9 59°F 62°F7 ft1013.1 hPa (-1.0)
FTPC1 - 9414290 - San Francisco, CA 21 mi49 min SW 2.9 G 8 59°F 60°F1013.5 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 22 mi43 min W 6 G 9.9 59°F 1012.1 hPa
PXSC1 22 mi43 min 60°F 59°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi71 min SW 3.9 G 5.8 58°F 58°F5 ft1013.5 hPa (-1.1)
AAMC1 - 9414750 - Alameda, CA 23 mi43 min W 6 G 8.9 60°F 69°F1013.6 hPa
OBXC1 23 mi43 min 60°F 59°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 24 mi43 min W 8.9 G 11
OKXC1 - 9414776 - Oakland (Berth 34), CA 24 mi43 min W 5.1 G 7 60°F 1013.1 hPa
LNDC1 25 mi43 min W 7 G 9.9 60°F 1013.1 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 27 mi54 min S 7 58°F 1013 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 29 mi43 min SW 8.9 G 13 60°F 1013.3 hPa
RCMC1 - 9414863 - Richmond, CA 30 mi49 min 65°F1012.9 hPa
PRYC1 - 9415020 - Point Reyes, CA 40 mi43 min Calm G 1.9 61°F 61°F1012.7 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 41 mi43 min SW 12 G 15 61°F 1012.5 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi43 min W 12 G 18 61°F 68°F1012.9 hPa60°F
PCOC1 - 9415144 - Port Chicago, CA 47 mi43 min WSW 16 G 20 60°F 69°F1012.4 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA3 mi66 minSE 47.00 miOvercast59°F57°F94%1012.5 hPa
San Francisco, San Francisco International Airport, CA13 mi65 minWNW 710.00 miMostly Cloudy59°F55°F90%1013 hPa
San Carlos Airport, CA16 mi71 minN 010.00 miOvercast63°F57°F83%1013.2 hPa
Oakland, Metro Oakland International Airport, CA22 mi68 minWNW 610.00 miOvercast60°F59°F96%1013 hPa

Wind History from SFO (wind in knots)
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Last 24hrW9W9W7W6W6W6NE4NE5NW12NW17NW16W16NW17NW18NW16W16W14W10NW8NW7W8NW6W5W7
1 day agoS3W4CalmCalmNW4NW4NW6N5N8NW14NW15NW16NW18W20W18W14NW14NW14W12W15W13W11W10W10
2 days agoS4CalmCalmSE3SE3CalmSE7N6N8N86NW13
G19
W13NW14NW13NW14NW10W9NW7NW5NW6NW4W4W5

Tide / Current Tables for Princeton, Half Moon Bay, California
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Princeton
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Sat -- 03:24 AM PDT     -0.62 feet Low Tide
Sat -- 04:09 AM PDT     Moonrise
Sat -- 06:29 AM PDT     Sunrise
Sat -- 10:14 AM PDT     4.84 feet High Tide
Sat -- 03:15 PM PDT     2.29 feet Low Tide
Sat -- 06:36 PM PDT     Moonset
Sat -- 07:56 PM PDT     Sunset
Sat -- 09:14 PM PDT     6.48 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.61.1-0-0.6-0.50.112.23.44.34.84.74.13.32.72.32.43.145.166.56.35.5

Tide / Current Tables for Sierra Point 1.3 mi ENE, South San Francisco Bay, California Current
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Sierra Point 1.3 mi ENE
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Sat -- 02:01 AM PDT     -1.50 knots Max Ebb
Sat -- 04:08 AM PDT     Moonrise
Sat -- 05:30 AM PDT     0.00 knots Slack
Sat -- 06:28 AM PDT     Sunrise
Sat -- 08:48 AM PDT     1.22 knots Max Flood
Sat -- 12:03 PM PDT     -0.01 knots Slack
Sat -- 02:43 PM PDT     -0.79 knots Max Ebb
Sat -- 05:27 PM PDT     0.01 knots Slack
Sat -- 06:36 PM PDT     Moonset
Sat -- 07:56 PM PDT     Sunset
Sat -- 08:30 PM PDT     0.97 knots Max Flood
Sat -- 11:26 PM PDT     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.9-1.4-1.5-1.4-1-0.40.30.81.11.210.60-0.5-0.7-0.8-0.6-0.20.30.70.90.90.70.3

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 (7,2,3,4)
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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.