Sunday, May19, 2019 L-36.com


Marine Weather and Tides
Los Altos Hills, CA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 5:54AMSunset 8:15PM Sunday May 19, 2019 4:13 AM PDT (11:13 UTC) Moonrise 8:19PMMoonset 5:46AM Illumination 100% Phase: Full Moon; Moon at 15 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- 212 Am Pdt Sun May 19 2019
.small craft advisory in effect through Monday morning...
Today..SW winds 15 to 20 kt with gusts up to 25 kt...becoming W 10 to 20 kt this afternoon. Wind waves 3 to 4 ft. W swell 7 to 9 ft at 14 seconds...building to 9 to 11 ft at 13 seconds this afternoon. A chance of showers and a slight chance of Thunderstorms.
Tonight..NW winds 5 to 15 kt. Wind waves around 3 ft. W swell 11 to 13 ft at 13 seconds. A chance of rain.
Mon..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. W swell 8 to 10 ft at 13 seconds.
Mon night..W winds 10 to 20 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. W swell 6 to 8 ft at 12 seconds. Rain likely.
Tue..NW winds 20 to 25 kt with gusts up to 30 kt. Wind waves 7 to 8 ft. W swell 7 to 8 ft at 12 seconds and S around 3 ft at 18 seconds. A chance of rain.
Tue night..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 6 to 7 ft. W swell 9 to 11 ft at 14 seconds and S around 3 ft at 18 seconds. A chance of rain.
Wed..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. W swell 10 to 12 ft and S around 3 ft.
Thu..NW winds 5 to 15 kt. Wind waves 2 ft or less. NW swell 7 to 9 ft and S around 3 ft. Winds and wind waves higher in and near Thunderstorms.
PZZ500 212 Am Pdt Sun May 19 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A low pressure system will move into the northern california waters early today bringing showers and a slight chance of Thunderstorms into late this morning. Moderate southerly winds will continue to gradually shift out of the west. SWells will build across the waters today creating hazardous conditions, particularly for smaller vessels. West to northwest winds will increase across the waters into Tuesday as another system passes by to the north.


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 191024
afdmtr
area forecast discussion
national weather service san francisco bay area
324 am pdt Sun may 19 2019

Synopsis Widespread showers are forecast this morning, followed
by scattered showers through the afternoon and into the evening
hours. There is also a slight chance of thunderstorms today. Dry
weather will return late tonight and into Monday. A cold system
dropping in from the north will bring renewed shower chances from
Monday night through Tuesday evening. Drier weather is forecast
later in the week, but temperatures will remain cooler than
normal.

Discussion As of 3:20 am pdt Sunday... An impressive late
season storm system continues to impact our region early this
morning. The initial frontal boundary that brought widespread
rain to our region yesterday and overnight has moved off to our
south and east, but scattered showers persist across northern
monterey county and northern san benito county at this time. And,
there is more on the way. Since last evening we've been tracking a
line of showers with embedded thunderstorms offshore. This line
of convective precipitation is moving out ahead of an upper low
as it approaches the northern california coast. Numerous lightning
strikes had been detected in this line last evening, but
lightning has become more isolated as this activity approaches the
coast, probably due to the colder near-shore water temperatures.

Even so, a lightning strike was recently detected about 60 miles
west of marin county. Based on extrapolation of satellite and
radar trends, this line of showers and isolated thunderstorms
should begin to push onshore in the sf bay area prior to sunrise,
which is a few hours faster than models have been forecasting.

Widespread shower activity is expected to spread from west to east
across our area through late morning as this line moves through.

Scattered showers will then continue through the afternoon hours
as the upper low tracks across the sf bay area. Based on the
location of lightning strikes offshore, the potential for
thunderstorms will be highest this morning as the line of
convective precipitation moves through. Models indicate that the
most unstable airmass will shift to our east into the central
valley by this afternoon. In any case, slight thunderstorm chances
will continue across our area into the afternoon hours as breaks
in the clouds allow the strong mid-may Sun to heat the surface.

Showers will taper off and end from northwest to southeast this
evening and overnight as the upper low moves off quickly to our
southeast. Additional rainfall totals through tonight are
generally forecast to range from one-quarter to three-quarters of
an inch, although locally higher amounts are possible due to the
convective nature of the precipitation. Also, small hail will be
possible with heavier showers and isolated thunderstorms today.

Finally, snow levels are forecast to drop as low as 4500 feet
today and we could see light snow accumulation on the higher peaks
in the santa lucia mountain range in monterey county.

After a brief period of dry weather from late tonight through
Monday, the next system is forecast to drop in from the northwest
and bring scattered showers to our region from Monday night
through Tuesday evening. This next system will not have nearly as
much moisture at its disposal compared to our current system.

Thus, rainfall amounts are forecast to be light and less than a
quarter of an inch. The Tuesday system is also forecast to
generate gusty northwest winds near the coast on Tuesday afternoon
and evening.

Drier weather is forecast for the remainder of the week as the
longwave trough axis settles to our east over the great basin. The
operational runs of the GFS and ECMWF both develop scattered light
precipitation over our area late in the week and into the memorial
day weekend as disturbances drop down the back side of the trough
and into california, or as the longwave trough position
retrogrades. However, the national blend of models (nbm)
maintains very low pops from midweek on through the weekend,
likely due to the fact that most of the GFS and ECMWF ensemble
members forecast little or no rainfall in our area during the
extended forecast period.

Temperatures this week will remain well below normal through
Tuesday. Somewhat warmer temperatures are forecast from Wednesday
onward, but temps will still remain cooler than seasonal averages.

Aviation As of 10:45 pm pdt Saturday... MVFR CIGS through
Sunday. Shower activity will decrease during the late night hours
but will pick up again Sunday morning as the upper low moves
towards the bay area. Lightning strikes have been detected near
the upper low so have added vcts to the bay area tafs Sunday
morning. By Sunday afternoon showers will decrease over the area
and shift into the central valley. Models indicate winds switching
to the southwest after 09z and becoming gusty Sunday morning.

Could see gusts as high as 25-30 kt especially during heavier
showers.

Vicinity of ksfo... MVFR CIGS with bases 2000-3000 feet. Shower
activity should wind down after midnight but will pick up again
after 14z. Possibility of a thunderstorm with gusty southwest
winds up to 25-30 mph. Shower activity will decrease Sunday
afternoon.VFR returns Sunday evening with showers ending.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Generally MVFR cigs. Showers decreasing
after 08-09z but another round of showers is expected after 15z
continuing through the afternoon. Gusty southeast winds to 25 kt
in the salinas valley impacting sns through Sunday. Light winds at
mry.

Marine As of 2:12 am pdt Sunday... A low pressure system will
move into the northern california waters early today bringing
showers and a slight chance of thunderstorms into late this
morning. Moderate southerly winds will continue to gradually shift
out of the west. Swells will build across the waters today
creating hazardous conditions, particularly for smaller vessels.

West to northwest winds will increase across the waters into
Tuesday as another system passes by to the north.

Mtr watches warnings advisories
Tday Sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm
sca... Pigeon pt to pt pinos 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Rough bar advisory for sf bar
sca... Mry bay
sca... Sf bay until 12 pm
public forecast: dykema
aviation: W pi
marine: as
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 11 mi44 min SE 1.9 G 4.1 53°F 64°F1007.9 hPa
AAMC1 - 9414750 - Alameda, CA 30 mi44 min SW 7 G 8.9 1007.5 hPa
LNDC1 31 mi44 min SW 4.1 G 6 55°F 1007 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 32 mi44 min SSW 8.9 G 11
OBXC1 33 mi44 min 56°F 53°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 33 mi44 min S 2.9 G 6 55°F 1006 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 33 mi44 min SW 5.1 G 8 55°F 1007.1 hPa
PXSC1 33 mi44 min 56°F 53°F
FTPC1 - 9414290 - San Francisco, CA 35 mi44 min S 4.1 G 5.1 1007.1 hPa
46237 - San Francisco Bar, CA (142) 39 mi74 min 57°F8 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 40 mi99 min Calm 52°F 1007 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 40 mi44 min SW 8.9 G 9.9 57°F 1007.1 hPa
RCMC1 - 9414863 - Richmond, CA 41 mi44 min SSW 5.1 G 8 59°F1006.6 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA 41 mi84 min WSW 12 G 16 57°F 58°F10 ft1008 hPa (+0.0)
46092 - MBM1 42 mi51 min WSW 14 56°F 58°F1008.3 hPa (+0.0)
MLSC1 - Moss Landing, South Harbor, CA 43 mi57 min W 12 G 32 54°F 1009 hPa52°F
ELXC1 - Elkhorn Slough Reserve, CA 44 mi89 min S 5.1 52°F 1009 hPa51°F
46114 - West Monterey Bay, CA 44 mi44 min 58°F10 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 45 mi34 min S 9.7 G 12 55°F 56°F1007.1 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 47 mi44 min SSW 5.1 G 6 54°F 61°F1006.9 hPa54°F
UPBC1 48 mi44 min WSW 7 G 8.9
PCOC1 - 9415144 - Port Chicago, CA 49 mi44 min S 5.1 G 6 53°F 62°F1007 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 49 mi44 min SSW 4.1 G 6 54°F 1006.5 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 mi78 minVar 410.00 miA Few Clouds53°F50°F89%1008.2 hPa
San Jose, San Jose International Airport, CA13 mi21 minSSE 410.00 miFair51°F51°F100%1007.8 hPa
Half Moon Bay Airport, CA20 mi19 minS 65.00 miFog/Mist54°F51°F94%1007.4 hPa
San Francisco, San Francisco International Airport, CA21 mi78 minSW 610.00 miA Few Clouds53°F48°F86%1007.2 hPa
Hayward, Hayward Air Terminal, CA22 mi20 minSE 410.00 miFair51°F50°F96%1008.2 hPa
Oakland, Metro Oakland International Airport, CA24 mi21 minSW 1010.00 miPartly Cloudy55°F48°F80%1007.4 hPa

Wind History from NUQ (wind in knots)
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Last 24hrSE4SE4S4SE5SE6S5NW5CalmSE6SE7SE12
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1 day agoNW4CalmSW3S4N3E33N6N9N10N12N15N18
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W9NW6NW8W4CalmCalmSW3CalmCalmCalmCalm
2 days agoSW7S10
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Tide / Current Tables for Palo Alto Yacht Harbor, California
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Palo Alto Yacht Harbor
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Sun -- 01:18 AM PDT     8.73 feet High Tide
Sun -- 05:56 AM PDT     Sunrise
Sun -- 06:44 AM PDT     Moonset
Sun -- 08:31 AM PDT     -1.18 feet Low Tide
Sun -- 02:31 PM PDT     6.75 feet High Tide
Sun -- 08:13 PM PDT     Sunset
Sun -- 08:42 PM PDT     2.30 feet Low Tide
Sun -- 09:19 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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7.88.78.57.35.63.61.70-1-1.1024.15.86.66.76.15.34.33.32.52.33.14.7

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
Sun -- 01:23 AM PDT     -0.01 knots Slack
Sun -- 05:56 AM PDT     Sunrise
Sun -- 06:03 AM PDT     -1.62 knots Max Ebb
Sun -- 06:44 AM PDT     Moonset
Sun -- 08:43 AM PDT     0.01 knots Slack
Sun -- 11:29 AM PDT     1.73 knots Max Flood
Sun -- 02:50 PM PDT     -0.01 knots Slack
Sun -- 06:36 PM PDT     -0.85 knots Max Ebb
Sun -- 08:13 PM PDT     Sunset
Sun -- 08:39 PM PDT     0.01 knots Slack
Sun -- 09:19 PM PDT     Moonrise
Sun -- 11:10 PM PDT     1.22 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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10.3-0.3-0.8-1.2-1.5-1.6-1.3-0.70.31.21.71.71.40.7-0.1-0.4-0.7-0.8-0.8-0.40.20.91.2

Weather Map and Satellite Images
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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 (7,2,3,4)
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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.