Wednesday, February21, 2018 L-36.com


Marine Weather and Tides
La Honda, 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 6:47AMSunset 5:56PM Wednesday February 21, 2018 4:42 PM PST (00:42 UTC) Moonrise 10:18AMMoonset 11:59PM Illumination 42% Phase: First Quarter Moon; Moon at 7 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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PZZ560 Coastal Waters From Pigeon Point To Point Pinos California Out To 10 Nm- 207 Pm Pst Wed Feb 21 2018
.small craft advisory in effect from late tonight through late Thursday night...
Rest of today..NW winds 5 to 15 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft at 15 seconds.
Tonight..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. NW swell 3 to 4 ft at 15 seconds.
Thu..NW winds 20 to 25 kt with gusts up to 35 kt. Wind waves 6 to 9 ft. NW swell around 3 ft at 20 seconds. A chance of showers.
Thu night..NW winds 20 to 30 kt with gusts up to 40 kt. Wind waves 5 to 8 ft. W swell 3 to 4 ft at 19 seconds. A chance of showers, mainly in the evening.
Fri..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 6 ft. W swell 4 to 5 ft at 18 seconds.
Fri night..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 3 to 5 ft. W swell 4 to 6 ft at 16 seconds.
Sat..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 6 ft...increasing to 5 to 8 ft. W swell 3 to 5 ft.
Sun..NW winds 10 to 20 kt. Wind waves 3 to 4 ft...becoming 2 ft or less. W swell 3 to 5 ft.
PZZ500 207 Pm Pst Wed Feb 21 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light variable winds will transition to increasing northerly winds through the remainder of the day. Northerly winds will continue to strengthen overnight and through tomorrow, bringing very gusty winds and steep fresh swell. Gale force gusts are possible in the outer waters tomorrow afternoon through late tomorrow night.

7 Day Forecast for Marine Location Near La Honda, CA
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location: 37.3, -122.29     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 212332
afdmtr
area forecast discussion
national weather service san francisco bay area
332 pm pst Wed feb 21 2018

Synopsis A weak weather system will impact the region tomorrow
bringing showers, a slight chance of scattered thunderstorms in
the afternoon, and lowering snow levels. This system will also bring
gusty winds tomorrow and colder temperatures Friday morning. Dry
weather and slightly warmer daytime conditions are likely for the
weekend with cooler, unsettled weather potentially returning
early next week.

Discussion As of 01:58 pm pst Wednesday... Shower activity has
moved out for the day with partly cloudy skies expected the rest
of the afternoon and evening. Unseasonably cool temperatures
continue this afternoon with forecast highs in the 50s and 40s for
higher peaks.

The main forecast concern continues to be a weak short-wave
trough that will move through the area tomorrow. This system is
expected to bring scattered rain and snow showers, scattered
afternoon thunderstorms, and widespread gusty winds to the region.

Shower activity tomorrow will be scattered with little
accumulations expected. Along with this system will come another
burst of cold air allowing for lowered snow levels to around 2000
ft and light snow accumulations possible in the higher peaks.

Sufficient instability will allow for the development of
scattered thunderstorms over parts of the north and east bay
starting in the afternoon as forecast models show a few hundred
j kg of CAPE over the area. Some storms may carry small hail, and
a few high elevation areas may even see a little thundersnow.

Winds will begin to pick up early tomorrow morning and increase
throughout the day. Strongest winds are expected along the coast
and in the hills with gusts over 40 mph possible. Once the winds
subside and skies begin to clear tomorrow night, temperatures will
drop into the 30s for most areas with some valley locations in
the 20s.

Once this system moves out, dry conditions are expected Friday and
through the weekend as the persistent deep trough overhead begins
to slightly weaken and shift inland. This will allow for afternoon
highs to warm slightly over the weekend, although cool overnight
and morning lows will continue.

Looking into next week, models continue to suggest that we will
remain in a broad troughing pattern with weaker embedded systems
developing and moving through the area. Meaning cool and
unsettled weather will likely persist into early next week.

Aviation As of 3:30 pm pst Wednesday... Skies have cleared up
this afternoon following the passage of a dry shortwave.VFR
conditions are expected this evening before another upper level
shortwave approaches the area late tonight. Models indicate lower
level moisture after 09z but only lasting a few hours as strong
northerly winds help to clear out the clouds after 13-14z.

Vicinity of ksfo...VFR except for a period of lower clouds between
10z-13z possibly lowering into MVFR range. Offshore winds up to
10 kt switching to onshore before dark. Much stronger northwest
winds are anticipated Thursday morning after 13-14z with
potential for an airport weather warning Thursday afternoon.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR.

Climate
Here are record low temperatures and the years they occurred for
Wednesday.

Location Wednesday
sf bay area
healdsburg 28 in 1929
santa rosa 26 in 1913
calistoga 25 in 2006
kentfield 29 in 1953
san rafael 33 in 1955
napa 29 in 1955
san francisco 36 in 1890
sfo airport 34 in 1955
half moon bay 31 in 2006
oakland airport 33 in 1955
richmond 35 in 1981
livermore 27 in 1955
moffett field 32 in 1955
san jose 25 in 1897
gilroy 31 in 1976
monterey bay area
santa cruz 30 in 1955
salinas 31 in 1970
salinas airport 30 in 1953
monterey 36 in 1952
king city 23 in 1953

Marine As of 03:21 pm pst Wednesday... Light variable winds will
transition to increasing northerly winds through the remainder of
the day. Northerly winds will continue to strengthen overnight and
through tomorrow, bringing very gusty winds and steep fresh swell.

Gale force gusts are possible in the outer waters tomorrow
afternoon through late tomorrow night.

Mtr watches warnings advisories
Tngt Sca... Mry bay from 3 am
sca... Pt reyes to pigeon pt 0-10 nm from 3 am
sca... Pigeon pt to pt pinos 0-10 nm from 3 am
sca... Pt pinos to pt piedras blancas 0-10 nm from 3 am
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm from 9 pm
sca... Pt arena to pt reyes 0-10 nm from 9 pm
sca... Sf bay from 3 am
public forecast: as
aviation: W pi
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 15 mi43 min WNW 6 G 8.9 54°F 53°F1022.1 hPa (-0.5)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 32 mi53 min NW 5.8 G 5.8 50°F 54°F5 ft1021.9 hPa (-0.7)
AAMC1 - 9414750 - Alameda, CA 33 mi43 min W 7 G 9.9 53°F 54°F1021.7 hPa (-0.7)
LNDC1 34 mi43 min NW 7 G 9.9 54°F 1021.6 hPa (-0.7)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 35 mi43 min W 8.9 G 9.9
PXOC1 - 9414311 - San Francisco (Pier 1), CA 35 mi43 min WNW 5.1 G 8.9 52°F 1021 hPa (-0.6)
PXSC1 35 mi43 min 53°F 29°F
OBXC1 35 mi43 min 53°F 28°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 35 mi43 min WNW 8 G 8.9 53°F 1021.7 hPa (-0.7)
46042 - MONTEREY - 27NM West of Monterey Bay, CA 36 mi53 min NW 7.8 G 9.7 51°F 55°F4 ft1021.6 hPa (-0.8)
FTPC1 - 9414290 - San Francisco, CA 36 mi43 min W 7 G 9.9 51°F 53°F1022.2 hPa (-0.7)
46237 - San Francisco Bar, CA (142) 38 mi43 min 53°F4 ft
46092 - MBM1 40 mi98 min WNW 12 51°F 54°F1021.7 hPa (-1.0)
46114 - West Monterey Bay, CA 40 mi43 min 55°F5 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 42 mi39 min WSW 1.9 55°F 1022 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 42 mi43 min W 5.1 G 8.9 55°F 1021.8 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 43 mi53 min WNW 7.8 G 7.8 49°F 52°F4 ft1022.5 hPa (-0.4)
ELXC1 - Elkhorn Slough Reserve, CA 44 mi58 min NW 12 53°F 1021 hPa38°F
RCMC1 - 9414863 - Richmond, CA 44 mi43 min NW 2.9 G 5.1 53°F 54°F1021.3 hPa (-0.8)

Wind History for Redwood City, CA
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W12
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W22
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Palo Alto Airport, CA15 mi2.9 hrsN 610.00 miA Few Clouds0°F0°F%1022 hPa
Mountain View, Moffett Field, CA16 mi47 minN 910.00 miFair56°F30°F37%1021.7 hPa
San Carlos Airport, CA16 mi53 minN 510.00 miA Few Clouds55°F26°F33%1021.7 hPa
Half Moon Bay Airport, CA18 mi48 minNW 1110.00 miFair50°F35°F58%1021.3 hPa
San Jose, San Jose International Airport, CA20 mi50 minWNW 610.00 miPartly Cloudy57°F28°F33%1021.2 hPa
San Francisco, San Francisco International Airport, CA22 mi47 minN 010.00 miPartly Cloudy56°F28°F34%1021.7 hPa

Wind History from PAO (wind in knots)
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Last 24hr--NW7W7NW7W65Calm------------------CalmCalm44CalmCalm6N6
1 day agoNW14NW12
G18
NW12
G18
W12--NW10NW10------------------CalmCalmCalm--NE5555
2 days agoW16
G25
W15
G22
--W17
G23
W15
G22
W15
G22
W15------------------6NW8
G15
NW7
G15
--NW10NW14NW14NW14

Tide / Current Tables for Ano Nuevo Island, California
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Ano Nuevo Island
Click for Map
Wed -- 01:42 AM PST     4.88 feet High Tide
Wed -- 06:50 AM PST     Sunrise
Wed -- 08:14 AM PST     1.14 feet Low Tide
Wed -- 10:19 AM PST     Moonrise
Wed -- 02:22 PM PST     3.49 feet High Tide
Wed -- 05:55 PM PST     Sunset
Wed -- 08:03 PM PST     1.73 feet Low Tide
Wed -- 11:58 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.34.84.94.53.932.11.41.21.31.72.22.83.23.53.43.22.72.31.91.71.92.43.1

Tide / Current Tables for Dumbarton Bridge, San Francisco Bay, California Current
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Dumbarton Bridge
Click for Map
Wed -- 01:55 AM PST     1.43 knots Max Flood
Wed -- 05:29 AM PST     -0.00 knots Slack
Wed -- 06:50 AM PST     Sunrise
Wed -- 08:12 AM PST     -1.14 knots Max Ebb
Wed -- 10:17 AM PST     Moonrise
Wed -- 11:20 AM PST     0.00 knots Slack
Wed -- 02:36 PM PST     1.31 knots Max Flood
Wed -- 05:54 PM PST     Sunset
Wed -- 06:26 PM PST     -0.00 knots Slack
Wed -- 08:36 PM PST     -0.73 knots Max Ebb
Wed -- 11:04 PM PST     0.00 knots Slack
Wed -- 11:58 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.81.31.41.20.80.3-0.3-0.8-1.1-1-0.6-0.20.30.91.21.310.70.2-0.3-0.7-0.7-0.4-0

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 (19,4,5,8)
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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.