Friday, April20, 2018 L-36.com


Marine Weather and Tides
Lagunitas-Forest Knolls, CA

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.

Sunrise 6:24AMSunset 7:52PM Friday April 20, 2018 11:30 AM PDT (18:30 UTC) Moonrise 9:17AMMoonset 12:00AM Illumination 29% Phase: Waxing Crescent; Moon at 5 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- 851 Am Pdt Fri Apr 20 2018
.small craft advisory in effect through late Saturday night...
Today..NW winds 15 to 25 kt. Wind waves 2 to 4 ft. W swell 4 to 5 ft at 12 seconds.
Tonight..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 3 to 5 ft at 15 seconds.
Sat..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 4 to 6 ft at 15 seconds.
Sat night..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 4 to 6 ft at 15 seconds.
Sun..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 5 to 7 ft at 14 seconds.
Mon..W winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 6 to 8 ft.
Tue..W winds 10 kt. Wind waves 2 ft or less. W swell 3 to 5 ft...increasing to 6 to 8 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 6 to 8 ft at 12 seconds. Across the bar...combined seas 7 to 9 ft at 12 seconds. Maximum ebb current of 1.3 knots at 08:07 pm Friday and 3.6 knots at 07:19 am Saturday.
PZZ500 851 Am Pdt Fri Apr 20 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds will increase this afternoon over the coastal waters as high pressure remains over the eastern pacific. These winds will generate steep wind waves and fresh swell, resulting in hazardous seas into the weekend.

7 Day Forecast for Marine Location Near Lagunitas-Forest Knolls CDP, CA
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location: 37.98, -122.74     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 201739
afdmtr
area forecast discussion
national weather service san francisco bay area
1039 am pdt Fri apr 20 2018

Synopsis A warmer trend and dry weather are forecast through
the upcoming weekend. A weak cutoff low approaches the state after
midweek.

Discussion As of 08:52 am pdt Friday... Morning visible
satellite shows a taste of summer - low clouds and patchy fog
hugging the coast from big sur to point reyes with a slight
intrusion into the monterey bay salinas valley. Did a quick update
this morning to better reflect reality with cloud cover this
morning.

Otherwise, should be a nice end to the work week with sunny skies
this afternoon and warmer temperatures. Temperatures today will
be a few warmer than Thursday and even a few above normal for late
april. Highs 60s coast and 70s inland.

Prev discussion As of 3:33 am pdt Friday... Satellite imagery shows
mostly clear skies across the district except for some low clouds
over the ocean starting to touch the coast along the san francisco
peninsula as well as near monterey and north of point sur.

Temperatures are generally warmer than they were 24 hours ago with
readings in the mid 40s to the lower 50s. Highs today are
expected to warm into the 60s and 70s.

High pressure aloft is forecast to build in over the state during
the weekend resulting in warmer temperatures with highs across
inland areas reaching the mid 80s by Saturday. A weak upper
trough is progged to brush across northern california on Sunday
for slight cooling, mainly across the north bay area. Slight
cooling to extend across the remainder of the district by Monday.

Medium range models continue to indicate a cutoff low forming
off the california coast around the middle of next week. The
solutions vary regarding the position of cutoff low as well as
when it tracks inland. Most likely impacts will be in increasing
marine layer and onshore flow, thus cooler temperatures. The
possibility of showers as the trough tracks inland exists, but
confidence is low.

Aviation As of 10:39 am pdt Friday for 18z tafs. Latest
visible satellite shows the stratus deck deteriorating and pulling
away from the central california bay area coastline. Thus,VFR,
with mainly clear skies, will prevail through the afternoon at all
terminals. West winds are expected to increase this afternoon,
generally sustained around 10-15 kt across the district. Hi-res
models and guidance suggest another push of stratus tonight along
the immediate monterey bay coast. Overall medium confidence.

Vicinity of ksfo...VFR expected through the TAF period. Light
offshore winds in the morning will increase and turn onshore in
the afternoon and evening to around 20 kt. Winds are forecast to
diminish after sunset. With a weak onshore gradient expected
overnight, no threat of stratus developing around the terminal
at this time, but will monitor conditions and forecast guidance
closely through the day.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Skies have cleared nicely at kmry and
ksns andVFR is expected through the rest of the day. Models hint
at low clouds developing again tonight, but confidence remains
low with regards to timing and coverage. Light to moderate onshore
winds anticipated this afternoon.

Marine As of 8:51 am pdt Friday... Northwest winds will
increase this afternoon over the coastal waters as high pressure
remains over the eastern pacific. These winds will generate steep
wind waves and fresh swell, resulting in hazardous seas into the
weekend.

Mtr watches warnings advisories
Tday Sca... Pigeon pt to pt pinos 0-10 nm
sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
public forecast: mm sims
aviation: bam
marine: bam
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PRYC1 - 9415020 - Point Reyes, CA 13 mi42 min E 2.9 G 4.1 53°F1022.4 hPa
46237 - San Francisco Bar, CA (142) 15 mi60 min 55°F6 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 16 mi40 min NNW 5.8 G 5.8 51°F 53°F6 ft1022.8 hPa (+0.6)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 17 mi49 min SE 6 57°F 1022 hPa
RCMC1 - 9414863 - Richmond, CA 18 mi48 min SSE 6 G 8 56°F 57°F1022.2 hPa
FTPC1 - 9414290 - San Francisco, CA 19 mi48 min WNW 7 G 11 54°F 56°F1022.7 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 21 mi42 min S 5.1 G 8 56°F 1022.7 hPa
PXSC1 22 mi42 min 56°F 53°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 22 mi42 min N 2.9 G 4.1 55°F 1021.5 hPa
OBXC1 24 mi42 min 57°F 51°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 25 mi42 min W 2.9 G 2.9
OKXC1 - 9414776 - Oakland (Berth 34), CA 25 mi42 min NW 2.9 G 2.9 57°F 1022.4 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 26 mi42 min NW 5.1 G 6 59°F 1022 hPa
AAMC1 - 9414750 - Alameda, CA 27 mi48 min SE 2.9 G 2.9 57°F 60°F1022.4 hPa
LNDC1 27 mi42 min WSW 1 G 1.9 58°F 1022.3 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 33 mi42 min NW 9.9 G 11 61°F 59°F1021.9 hPa57°F
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 35 mi30 min NW 12 G 14 52°F 51°F1023.2 hPa (+0.9)50°F
PCOC1 - 9415144 - Port Chicago, CA 38 mi42 min W 8 G 8.9 62°F 59°F1021.7 hPa
SFXC1 - San Francisco Bay Reserve, CA 41 mi105 min SW 2.9 64°F 1022 hPa50°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 43 mi40 min NW 12 G 16 53°F 54°F7 ft1022.8 hPa (+0.9)
RTYC1 - 9414523 - Redwood City, CA 43 mi42 min N 1.9 G 2.9 61°F 61°F1022.7 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 45 mi48 min NNW 4.1 G 5.1 65°F 1021.6 hPa

Wind History for Point Reyes, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA15 mi55 minN 010.00 miFair63°F48°F60%1022 hPa
Petaluma Municipal Airport, CA20 mi55 minN 010.00 miFair63°F50°F64%1022.3 hPa

Wind History from DVO (wind in knots)
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Last 24hrNW10NW11NW8
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CalmCalmCalmNE3CalmNE3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
1 day ago4CalmSW8W106
G15
SW114W7SW11N6N7N4CalmCalmCalmCalmCalmS3CalmSW4CalmN4N4N8
2 days ago5SE74Calm3W5SW12W7NE7N8CalmNE4CalmCalmCalmCalmCalmCalmCalmCalmCalmN4CalmCalm

Tide / Current Tables for Bolinas Lagoon, California
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Bolinas Lagoon
Click for Map
Fri -- 12:02 AM PDT     Moonset
Fri -- 02:42 AM PDT     4.08 feet High Tide
Fri -- 06:28 AM PDT     Sunrise
Fri -- 10:14 AM PDT     -0.44 feet Low Tide
Fri -- 10:17 AM PDT     Moonrise
Fri -- 04:53 PM PDT     3.10 feet High Tide
Fri -- 07:51 PM PDT     Sunset
Fri -- 10:18 PM PDT     1.60 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.73.43.94.13.83.22.31.30.5-0.2-0.4-0.30.20.91.72.42.93.12.92.62.21.81.61.7

Tide / Current Tables for Point Reyes, California Current
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Point Reyes
Click for Map
Fri -- 12:04 AM PDT     Moonset
Fri -- 12:41 AM PDT     0.72 knots Max Flood
Fri -- 03:20 AM PDT     -0.00 knots Slack
Fri -- 06:29 AM PDT     Sunrise
Fri -- 06:54 AM PDT     -1.39 knots Max Ebb
Fri -- 10:18 AM PDT     Moonrise
Fri -- 10:45 AM PDT     0.00 knots Slack
Fri -- 01:50 PM PDT     1.01 knots Max Flood
Fri -- 05:28 PM PDT     -0.00 knots Slack
Fri -- 07:37 PM PDT     -0.63 knots Max Ebb
Fri -- 07:52 PM PDT     Sunset
Fri -- 10:44 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.70.70.50.1-0.3-0.8-1.2-1.4-1.2-0.8-0.30.10.60.910.90.60.2-0.2-0.6-0.6-0.4-0.20.1

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 (14,3,4,5)
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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.