Wednesday, April25, 2018 L-36.com


Marine Weather and Tides
Los Altos Hills, 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 6:17AMSunset 7:54PM Wednesday April 25, 2018 1:28 AM PDT (08:28 UTC) Moonrise 2:36PMMoonset 3:11AM Illumination 75% Phase: Waxing Gibbous; Moon at 10 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 Pigeon Point To Point Pinos To 10 Nm- 817 Pm Pdt Tue Apr 24 2018
Tonight..NW winds 5 to 15 kt...becoming 5 to 10 kt after midnight. Wind waves 2 ft or less. W swell 6 to 7 ft at 15 seconds. Patchy fog after midnight.
Wed..NW winds 5 to 15 kt. Wind waves 2 ft or less. W swell 5 to 7 ft at 14 seconds. Patchy fog.
Wed night..NW winds 5 to 15 kt. Wind waves 2 ft or less. W swell 4 to 6 ft at 13 seconds.
Thu..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. W swell 3 to 5 ft at 13 seconds and S up to 3 ft at 16 seconds.
Thu night..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 12 seconds and S up to 3 ft at 16 seconds.
Fri..NW winds 5 to 10 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft and S up to 3 ft.
Fri night..W winds 5 to 10 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft and S up to 3 ft.
Sat..NW winds 5 to 15 kt. Wind waves 2 ft or less. NW swell 4 to 6 ft and S up to 3 ft.
Sun..NW winds 10 to 20 kt. Wind waves 2 ft or less. NW swell 3 to 7 ft.
PZZ500 817 Pm Pdt Tue Apr 24 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light to moderate west to northwest winds will continue through the week. Locally gusty conditions possible near coastal gaps or prominent points such as the golden gate and point sur. Light to moderate seas will also persist through the forecast period with a mixed south and northwest swell developing late in the week.

7 Day Forecast for Marine Location Near Los Altos Hills, CA
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location: 37.35, -122.18     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 250535
afdmtr
area forecast discussion
national weather service san francisco bay area
1035 pm pdt Tue apr 24 2018

Synopsis A cooling trend is forecast to persist through late
week and into the upcoming weekend as an upper level trough
approaches from the pacific. This system may produce a few showers
over the north bay late Friday into Saturday as it pushes inland
north of our region, yet widespread rainfall is unlikely.

Discussion As of 8:38 pm pdt Tuesday... Visible satellite
imagery just before sunset revealed extensive stratus coverage
over the coastal waters. Onshore flow with a pressure gradient of
over 2 mb from san francisco to sacramento combined with a marine
layer of around 1,200 to 1,500 ft will allow for widespread
overcast conditions to return to much of the area overnight. In
fact, the stratus has already returned to monterey with overcast
conditions reported shortly before 8 pm pdt.

Today's onshore flow aided in bringing cooler temperatures to the
area, most notably to inland locations. For example, the high
temperature at the sonoma county airport ksts was 82 degrees on
Monday and only 67 degrees today. Expect this cooling trend to
continue into the second half of the work week before the next
weak system approaches from the west. No major updates planned to
the forecast this evening with the short-term on track. For
additional details, please refer to the previous discussion
section.

Prev discussion As of 01:48 pm pdt Tuesday... The mid upper level
ridge axis continues to shift further inland away from the west
coast today in advance of a broad trough well offshore. This has
allowed for cooling region-wide today (currently 16 deg f cooler
at santa rosa compared to 24 hours ago) with a marine layer
between 1,200-1,500 feet in depth. With this, onshore flow persist
along with coastal stratus.

The upper level trough and an associated low pressure system will
slowly approach the california coast through late week. As a result,
look for continued cooling, even inland, with coastal stratus
penetrating inland each night before retreating back to the coast
during the mid late morning hours. Daytime temperatures will
generally range from the upper 50s to middle 60s at the coast to
middle upper 70s inland through Thursday.

The center of the upper level low is then forecast to push into
northern california Friday into Saturday and bring a slight chance
of rain showers to the far northern portion of the north bay.

However, not expecting much in the way of widespread rainfall as the
core of this system stays well to our north. Elsewhere, temperatures
cool to below seasonal averages with ongoing dry weather conditions
likely into the upcoming weekend.

Aviation As of 10:35 pm pdt Tuesday... For 06z tafs. Stratus
visible along the central coast and beginning to make its way
inland.VFR conditions north of the monterey bay expected to hold
for another couple of hours before MVFR ifr CIGS develop.

Widespread stratus is expected to affect all terminals before
morning. Generally light winds overnight.

Vicinity of ksfo...VFR with low clouds beginning to move in. MVFR
cigs to return at around 10z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Stratus has moved into the monterey bay
area with ifr MVFR CIGS at kmry. Ifr MVFR conditions expected to
arrive at ksns over the next few hours. Once CIGS move in,
expecting them to remain in place through the early morning.

Generally light winds through the period.

Marine As of 08:17 pm pdt Tuesday... Light to moderate west to
northwest winds will continue through the week. Locally gusty
conditions possible near coastal gaps or prominent points such as
the golden gate and point sur. Light to moderate seas will also
persist through the forecast period with a mixed south and
northwest swell developing late in the week.

Mtr watches warnings advisories
Tngt None.

Public forecast: rowe rgass
aviation: as
marine: as
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 11 mi41 min NW 6 G 7 53°F 67°F1017.6 hPa
AAMC1 - 9414750 - Alameda, CA 30 mi41 min WNW 6 G 8.9 63°F1017.5 hPa
LNDC1 31 mi41 min NW 4.1 G 6 53°F 1017.3 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 32 mi41 min WNW 8 G 8.9
PXOC1 - 9414311 - San Francisco (Pier 1), CA 33 mi41 min WSW 8 G 11 51°F 1016.2 hPa
PXSC1 33 mi41 min 53°F 49°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 33 mi41 min WNW 7 G 11 52°F 1017.4 hPa
OBXC1 33 mi41 min 52°F 49°F
FTPC1 - 9414290 - San Francisco, CA 35 mi41 min WSW 5.1 G 8.9 54°F1017.6 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 37 mi39 min SW 1.9 G 7.8 53°F 56°F8 ft1017.6 hPa (+0.5)
46237 - San Francisco Bar, CA (142) 39 mi59 min 54°F6 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 40 mi42 min S 5.1 50°F 1017 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 40 mi47 min SW 4.1 G 5.1 54°F 1017.5 hPa
RCMC1 - 9414863 - Richmond, CA 41 mi137 min SW 5.1 G 8.9 53°F 57°F
46042 - MONTEREY - 27NM West of Monterey Bay, CA 41 mi39 min NW 7.8 G 9.7 53°F 55°F6 ft1017.5 hPa (+0.0)
46092 - MBM1 42 mi84 min W 5.8 53°F 54°F1017.3 hPa (+0.4)
46114 - West Monterey Bay, CA 44 mi29 min 56°F7 ft
ELXC1 - Elkhorn Slough Reserve, CA 44 mi104 min WNW 1 52°F 1018 hPa50°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 45 mi39 min W 3.9 G 7.8 51°F 54°F6 ft1017.7 hPa (+0.4)
MZXC1 - 9415102 - Martinez-Amorco CA 47 mi41 min W 14 G 17 53°F 61°F1016.7 hPa53°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 49 mi41 min WNW 11 G 13 1016.9 hPa
PCOC1 - 9415144 - Port Chicago, CA 49 mi41 min WSW 17 G 22 54°F 63°F1016.1 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mountain View, Moffett Field, CA9 mi33 minN 410.00 miFair54°F50°F87%1017.6 hPa
Palo Alto Airport, CA10 mi4.7 hrsNW 810.00 miPartly Cloudy0°F0°F%1016.3 hPa
San Carlos Airport, CA13 mi34 minNW 610.00 miPartly Cloudy54°F48°F82%1017.3 hPa
San Jose, San Jose International Airport, CA13 mi36 minNW 410.00 miMostly Cloudy54°F48°F80%1017.1 hPa
San Jose / Reid / Hillv, CA19 mi3.7 hrsNW 510.00 miMostly Cloudy57°F50°F77%1016.3 hPa
Half Moon Bay Airport, CA20 mi34 minN 08.00 miOvercast52°F48°F88%1017.9 hPa
San Francisco, San Francisco International Airport, CA21 mi33 minW 810.00 miPartly Cloudy53°F46°F77%1017.2 hPa
Hayward, Hayward Air Terminal, CA22 mi35 minNNW 610.00 miFair53°F45°F74%1018.2 hPa
Oakland, Metro Oakland International Airport, CA24 mi36 minWNW 910.00 miA Few Clouds51°F48°F89%1017.3 hPa

Wind History from NUQ (wind in knots)
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Last 24hrCalmNE3CalmCalmCalmCalmCalmCalmCalmN7N5N8N10NW10N10NW11N10N12N8N5N6N6N5N4
1 day agoCalmCalmCalmW3CalmCalmCalmCalmN3N3N4N8N8N12NW11N12N11N10NW5NW5N10N8N6NE5
2 days agoCalmCalmCalmS3CalmS4NW3N7N5N4N34N13N10N11N11N11N10N9CalmN3NW3NW3Calm

Tide / Current Tables for Palo Alto Yacht Harbor, California
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Palo Alto Yacht Harbor
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Wed -- 04:10 AM PDT     Moonset
Wed -- 04:29 AM PDT     1.57 feet Low Tide
Wed -- 06:20 AM PDT     Sunrise
Wed -- 09:37 AM PDT     7.42 feet High Tide
Wed -- 03:35 PM PDT     Moonrise
Wed -- 04:45 PM PDT     -0.16 feet Low Tide
Wed -- 07:52 PM PDT     Sunset
Wed -- 10:41 PM PDT     7.43 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.15.13.92.61.71.72.84.56.27.27.46.75.64.22.71.20.1-0.10.72.44.56.37.27.4

Tide / Current Tables for Dumbarton Point 2.3 mi NE, South San Francisco Bay, California Current
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Dumbarton Point 2.3 mi NE
Click for Map
Wed -- 02:36 AM PDT     -0.85 knots Max Ebb
Wed -- 04:10 AM PDT     Moonset
Wed -- 04:51 AM PDT     0.01 knots Slack
Wed -- 06:20 AM PDT     Sunrise
Wed -- 07:25 AM PDT     1.09 knots Max Flood
Wed -- 10:09 AM PDT     -0.00 knots Slack
Wed -- 02:40 PM PDT     -1.17 knots Max Ebb
Wed -- 03:35 PM PDT     Moonrise
Wed -- 05:11 PM PDT     0.01 knots Slack
Wed -- 07:52 PM PDT     Sunset
Wed -- 08:03 PM PDT     1.52 knots Max Flood
Wed -- 11:05 PM PDT     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.6-0.8-0.8-0.8-0.60.10.71.110.70.1-0.3-0.7-1-1.1-1.1-0.9-0.20.71.31.51.40.90.1

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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Wind Forecast for San Francisco/Monterey Bay Area, CA (4,6,7,8)
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Ground Weather Radar Station San Francisco Bay Area, 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.