Wednesday, February20, 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 6:49AMSunset 5:54PM Wednesday February 20, 2019 2:22 PM PST (22:22 UTC) Moonrise 7:28PMMoonset 7:50AM Illumination 98% Phase: Waning Gibbous; Moon at 16 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
    EDIT      (on/off)   Help
PZZ560 Coastal Waters From Pigeon Point To Point Pinos California Out To 10 Nm- 211 Pm Pst Wed Feb 20 2019
.small craft advisory in effect through Thursday evening...
Rest of today..NW winds 25 to 30 kt with gusts up to 40 kt. Wind waves 8 to 10 ft. NW swell 4 to 5 ft at 13 seconds and W up to 1 ft at 16 seconds. A chance of showers.
Tonight..NW winds 20 to 30 kt with gusts up to 40 kt. Wind waves 6 to 8 ft. NW swell 4 to 5 ft at 13 seconds and S around 1 ft at 16 seconds. A chance of showers.
Thu..N winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 6 ft. NW swell 4 to 6 ft at 17 seconds and S around 1 ft at 16 seconds.
Thu night..N winds 10 to 20 kt with gusts up to 30 kt. Wind waves 3 to 5 ft. NW swell 7 to 9 ft at 15 seconds and S around 1 ft at 15 seconds.
Fri..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. NW swell 6 to 8 ft at 14 seconds and S around 1 ft at 15 seconds.
Fri night..N winds 5 to 15 kt. Wind waves 2 ft or less. NW swell 4 to 6 ft at 14 seconds and S around 1 ft at 15 seconds.
Sat..NW winds 5 to 15 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft and S around 1 ft.
Sun..W winds up to 10 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft and S around 1 ft. A chance of rain.
PZZ500 211 Pm Pst Wed Feb 20 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds are expected to increase into this evening and remain gusty through the rest of the work week. Widespread gale force conditions are forecast across the outer waters starting late tonight and lasting through Thursday. Isolated gale force gusts will also be possible along the coast. Gusty winds will generate steep fresh swell causing hazardous conditions, especially for smaller vessels. Moderate northwest swell will continue through the end of the week.


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


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kmtr 202140
afdmtr
area forecast discussion
national weather service san francisco bay area
140 pm pst Wed feb 20 2019

Synopsis Lingering showers will continue over the region
through late this evening, especially over the central coast and
east bay hills with snow showers in elevations generally above
3,500 feet. Dry conditions develop on Thursday and persist into
Friday before rain returns to northern california during the
weekend and into early next week.

Discussion As of 01:39 pm pst Wednesday... Isolated showers
will continue over the central coast and out over the coastal
waters through this afternoon. Seeing some showers on radar in far
eastern napa county as well that will slide down into the east
bay and then forecast to push into santa clara, monterey and san
benito counties through early this evening. Overall, rainfall
amounts are generally a few hundredths to one- tenth of an inch
with each passing showers. Given the cold air mass aloft, small
hail will also be possible within the heavier showers and snow is
likely occuring in elevations at or above 3,500 feet. Lingering
showers look to potentially continue over the mountains above the
big sur coast into Thursday morning. Otherwise, showers will
tapper off late this evening and tonight across much of the region
as the short-wave disturbance exits.

Sky conditions will clear late tonight into Thursday with
temperatures again turning colder. Look for more widespread 30s for
inland areas and lower 40s near the coast on Thursday morning.

Daytime temperatures will warm into the 50s for most urban locations
while areas in the hills higher elevations will be slightly cooler.

This trend will continue into Friday with ongoing dry conditions as
a weak short-wave ridge develops.

The forecast models are converging in their solutions heading into
the weekend with increasing chances of precipitation over northern
california. At this time, the best chance for rainfall will be over
far northern sonoma and napa counties Saturday morning and then
southward to around the golden gate by the afternoon evening. Most
areas south of san francisco look to remain dry through this period.

Rain chances potentially shift southward on Sunday and linger across
the region during the first part of next week. However, the best
chances for widespread rainfall look to stay over the northern
portion of the region. If even a weak atmospheric river takes aim at
the north bay late in the forecast period, the potential for
flooding concerns would greatly increase. Folks are urged to monitor
the forecast in the coming days.

Looking out a bit further, longer range guidance suggest an
unsettled pattern with potential for widespread rainfall over the
region heading into the beginning of march. The CPC has our entire
region depicted in a 50% probability of above normal precipitation
from february 28th - march 6th. Stay tuned... The winter season
continues.

Aviation As of 09:30 am pst Wednesday... For 18z tafs. Still
expecting CIGS to lower this morning, but generally remain above
4,000 ft. BorderlineVFR MVFR CIGS through the early afternoon
before CIGS begin to rise. Showers to remain in the vicinity
through the evening hours. Biggest forecast concern today will be
gusty winds. Expecting NW W winds generally 10 to 20 kt with
gusts 20 to 30 kt with the windiest conditions still forecast for
the bay area TAF sites. Winds should taper off tonight.

Vicinity of ksfo... BorderlineVFR MVFR CIGS generally at or above
4,000 ft into the afternoon before CIGS are expected to lift.

Passing showers into the evening with the best chances this
morning through the early afternoon. Windy conditions this
afternoon, gusts 30 to 35 kt with sustained winds 15 to 25 kt.

Winds will subside overnight.

Sfo bridge approach... Similar to sfo.

Monterey bay terminals... .Borderline MVFRVFR CIGS around
3,000-5,000 feet today with passing light showers. Showers to
remain in the vicinity into tonight. Increasing NW winds today
with gusts generally around 25 kt into this evening. Winds to ease
overnight.

Marine As of 08:53 am pst Wednesday... Northwest winds are
expected to increase today and remain gusty through the rest of
the work week. Widespread gale force conditions are forecast
across the outer waters starting late tonight and lasting through
Thursday. Isolated gale force gusts will also be possible along
the coast. Gusty winds will generate steep fresh swell causing
hazardous conditions, especially for smaller vessels. Moderate
northwest swell will continue through the end of the week.

Mtr watches warnings advisories
Tngt 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 pinos to pt piedras blancas 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm until 3 am
sca... Pigeon pt to pt piedras blancas 10-60 nm until 3 am
glw... Pt arena to pigeon pt 10-60 nm from 3 am
glw... Pigeon pt to pt piedras blancas 10-60 nm from 3 am
sca... Sf bay until 9 pm
sca... Mry bay until 9 pm
public forecast: rgass
aviation: as
marine: as
visit us at

Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 11 mi52 min W 19 G 21 52°F 53°F1012.3 hPa
AAMC1 - 9414750 - Alameda, CA 30 mi52 min W 11 G 14 54°F 52°F1011.7 hPa
LNDC1 31 mi52 min WNW 9.9 G 14 55°F 1011.3 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 32 mi52 min WNW 13 G 17
PXSC1 33 mi52 min 54°F 40°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 33 mi52 min NW 12 G 15 53°F 1011.3 hPa
OBXC1 33 mi52 min 54°F 37°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 33 mi52 min W 7 G 15 54°F 1010.6 hPa
FTPC1 - 9414290 - San Francisco, CA 35 mi52 min W 12 G 17 52°F 54°F1011.8 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 40 mi59 min NNW 13 54°F 1012 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 40 mi58 min WNW 12 G 16 56°F 1011.5 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA 41 mi92 min NW 21 G 25 51°F 56°F9 ft1013.4 hPa (-1.7)
RCMC1 - 9414863 - Richmond, CA 41 mi52 min NW 11 G 14 54°F 53°F1011 hPa
46092 - MBM1 42 mi68 min W 21 51°F 55°F1012.6 hPa (-2.2)
MLSC1 - Moss Landing, South Harbor, CA 43 mi43 min WNW 23 G 59 53°F 1012.4 hPa44°F
ELXC1 - Elkhorn Slough Reserve, CA 44 mi97 min NW 12 54°F 1013 hPa43°F
46114 - West Monterey Bay, CA 44 mi52 min 56°F8 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 45 mi42 min NW 23 G 29 51°F 55°F1012.6 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 47 mi52 min W 17 G 19 53°F 49°F1010.7 hPa38°F
UPBC1 48 mi52 min WNW 17 G 19
PCOC1 - 9415144 - Port Chicago, CA 49 mi52 min W 15 G 19 54°F 49°F1010.8 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 49 mi58 min WNW 13 G 18 53°F 1010.9 hPa

Wind History for Redwood City, CA
(wind in knots)    EDIT      (on/off)   Help
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
-12
PM
1
PM
Last
24hr
NW1
S1
NW11
W7
G11
W8
G11
W8
W8
G11
SW5
W7
G10
W7
G11
W10
G14
W11
W12
G18
W14
G23
W16
G22
W16
W11
G14
W12
G15
W9
NW11
G15
W12
W18
W16
G21
1 day
ago
NW15
NW16
NW10
NE5
G9
N2
W4
SW3
S3
SE2
S3
S1
--
NE1
S2
S1
SE2
S1
--
W4
NW7
NW2
G5
NW3
W2
2 days
ago
W19
G23
W20
G26
W15
G20
W18
W13
G16
NW8
G11
SE6
G9
SE2
--
W3
NW5
NW5
S1
SE1
SW1
SW1
S3
--
--
SW1
NW8
G12
N7
NW6
NW9

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mountain View, Moffett Field, CA9 mi26 minW 9 G 1610.00 miMostly Cloudy56°F37°F51%1011.5 hPa
Palo Alto Airport, CA10 mi35 minWNW 1210.00 miMostly Cloudy0°F0°F%1011.5 hPa
San Jose, San Jose International Airport, CA13 mi29 minNNW 1510.00 miMostly Cloudy55°F41°F59%1010.9 hPa
San Carlos Airport, CA13 mi95 minW 11 G 2010.00 miOvercast54°F39°F58%1012.9 hPa
San Jose / Reid / Hillv, CA19 mi34 minNNW 1510.00 miMostly Cloudy55°F41°F59%1010.5 hPa
San Francisco, San Francisco International Airport, CA21 mi26 minWNW 1710.00 miA Few Clouds56°F39°F55%1011.1 hPa
Hayward, Hayward Air Terminal, CA22 mi28 minW 1410.00 miPartly Cloudy58°F41°F53%1011.8 hPa
Oakland, Metro Oakland International Airport, CA24 mi29 minW 1610.00 miPartly Cloudy57°F39°F51%1010.9 hPa

Wind History from NUQ (wind in knots)
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
Last 24hrNE5N7NW8NW6W5W3SW4CalmCalmCalmW7NW4W8
G15
NW106NW6NW5NW6NW5NW10
G16
NW7NW9
G18
NW8W9
G16
1 day agoNW9
G15
NW8NE11N12NE7SW3W4SW5CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmN6NE5CalmCalmN7
2 days agoNW9
G20
NW11
G19
W9W7NW6SE3S3CalmCalmCalmW3CalmCalmCalmCalmW3W3W4NW3NW7NW7N6NW95

Tide / Current Tables for Palo Alto Yacht Harbor, California
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Palo Alto Yacht Harbor
Click for Map
Wed -- 01:23 AM PST     7.70 feet High Tide
Wed -- 06:51 AM PST     Sunrise
Wed -- 07:39 AM PST     1.70 feet Low Tide
Wed -- 07:49 AM PST     Moonset
Wed -- 01:06 PM PST     9.16 feet High Tide
Wed -- 05:52 PM PST     Sunset
Wed -- 07:27 PM PST     Moonrise
Wed -- 08:09 PM PST     -0.92 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
6.77.67.56.75.44.12.81.91.82.64.46.68.49.18.77.25.23.11.2-0.2-0.9-0.513.2

Tide / Current Tables for Dumbarton Point 2.3 mi NE, South San Francisco Bay, California Current
   EDIT      (on/off)   Help   One Week of Data
Dumbarton Point 2.3 mi NE
Click for Map
Wed -- 01:34 AM PST     -0.01 knots Slack
Wed -- 05:30 AM PST     -1.09 knots Max Ebb
Wed -- 06:51 AM PST     Sunrise
Wed -- 07:35 AM PST     0.00 knots Slack
Wed -- 07:49 AM PST     Moonset
Wed -- 10:13 AM PST     1.55 knots Max Flood
Wed -- 01:12 PM PST     -0.00 knots Slack
Wed -- 05:47 PM PST     -1.65 knots Max Ebb
Wed -- 05:52 PM PST     Sunset
Wed -- 07:27 PM PST     Moonrise
Wed -- 08:19 PM PST     0.01 knots Slack
Wed -- 11:00 PM PST     1.78 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
1.30.5-0.2-0.6-0.9-1.1-1-0.50.41.11.51.40.90.2-0.4-0.9-1.3-1.6-1.6-1.2-0.30.71.51.8

Weather Map and Satellite Images
       (on/off)   HelpWeather Map
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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (17,4,5,8)
      (on/off)   Help

Ground Weather Radar Station San Francisco Bay Area, CA
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.