Monday, October15, 2018 L-36.com


Marine Weather and Tides
Colma, 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 7:17AMSunset 6:32PM Monday October 15, 2018 3:13 AM PDT (10:13 UTC) Moonrise 12:37PMMoonset 10:37PM Illumination 33% Phase: Waxing Crescent; Moon at 6 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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PZZ531 San Francisco Bay South Of The Bay Bridge- 213 Am Pdt Mon Oct 15 2018
Today..NE winds up to 10 kt...becoming W this afternoon.
Tonight..SW winds 5 to 15 kt.
Tue..W winds 5 to 15 kt.
Tue night..W winds 5 to 15 kt.
Wed..NW winds up to 10 kt.
Wed night..W winds up to 10 kt.
Thu..W winds up to 10 kt.
Fri..NW winds up to 10 kt.
PZZ500 213 Am Pdt Mon Oct 15 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Gusty offshore winds can be expected through late this morning in the suisun bay and the west delta as well as over the waters near coastal gaps. Winds will diminish this afternoon and then remain generally light to moderate through the forecast period. Mixed swell will continue with a long period southerly swell through mid week and a more moderate period northwest swell. A longer period northwest swell will arrive during the second half of the week.


7 Day Forecast for Marine Location Near Colma, CA
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location: 37.68, -122.42     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 150528
afdmtr
area forecast discussion
national weather service san francisco bay area
1028 pm pdt Sun oct 14 2018

Synopsis Offshore flow will result in warm and dry conditions
region-wide over the next few days, along with critical fire
weather conditions in the hills of the north and east bay through
at least midday Monday. Winds are forecast to diminish by Monday
afternoon, but dry weather with mild to warm temperatures are
forecast to persist through the week ahead.

Discussion As of 9:00 pm pdt Sunday... Focus this evening and
overnight will be winds in the north and east bay, and
particularly in the north bay mountains where models have
consistently forecast the strongest winds. North to northeast
winds have been locally strong and gusty all day in the hills of
the north and east bay and have increased over the past few hours.

The strongest winds as of 8 pm were on mount saint helena (4300')
near the sonoma napa lake county line where wind gusts as high as
73 mph have been reported. Winds elsewhere in the hills of the
north and east bay are generally gusting between 25 and 45 mph.

Based on the latest mesoscale model data, wind speeds are expected
to peak between about now and 3 am Monday morning. So we will
likely see slightly stronger winds, as well as more widespread
gusty winds, through the early morning hours of Monday. Wind have
also recently begun to pick up in the valleys with both santa rosa
and napa airports now reporting north to northeast winds of about
20 mph with higher gusts. The expectation is that most of the
strong winds will remain confined to the hills overnight,
especially in the north bay, so will continue to confine the wind
advisory to elevations above 1000 feet in the north bay. However,
will need to consider expanding the advisory into the north bay
valleys if winds begin to spike at lower elevations. The wind
advisory for the north bay mountains is in effect until 10 am
Monday morning.

Offshore winds have brought a very dry airmass into our region
today and current relative humidity values in the hills of the
north and east bay range from about 15 to 25 percent. There likely
won't be much increase in humidity values overnight and values
will likely drop into the single digits on Monday. The combination
of strong and gusty winds and very low humidity is creating
critical fire weather conditions. A red flag warning remains in
effect until noon on Monday for the north bay mountains and east
bay hills. See the fire weather discussion below for details.

Dry offshore winds and an upper level ridge building near the
northern california coast will combine to produce warmer
temperatures on Monday. Highs tomorrow are expected to be in the
70s near the ocean, with widespread 80s inland. We may see a few
80s near the coast as well, depending on how persistent offshore
flow is.

The synoptic-scale weather pattern near the west coast is forecast
to remain in a quasi rex block through the week ahead with an
upper high to our northwest and an upper low to our southeast.

This pattern will maintain light offshore flow and dry conditions
across our region through the week. Daytime temperatures will be
mild to warm. The dry air combined with long mid-october nights
will mean rather cool nights in the valleys, particularly once
winds subside by tomorrow night. Some of the cooler valleys may
see overnight lows in the upper 30s this week.

Out in the longer range, the models agree there is a potential for
rain, especially in the northern portion of our area, by around
next Tuesday (october 23rd).

Aviation As of 10:30 pm pdt Sunday... Upper level ridge is
building off the pacific northwest coast. Strong upper level
shortwave over the great basin digging southwest into southern
california. This has intensified the offshore flow over the north
and east bay hills. Based on amdar soundings and pirep reports llws
is likely occurring over sts oak sfo and lvk and should last
through 18z when winds aloft decreases. Although satellite image
shows a few patches of stratus over the san mateo coast the
offshore winds will keep it out of the mry bay area.

Vicinity of ksfo...VFR. North to northeast winds to 10 kt. Low
level wind shear through 18z with northeast winds to 25-30 kt
above 2000 feet after 06z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR with stratus being held offshore.

Fire weather As of 8:55 pm pdt Sunday... Offshore winds in the
north and east bay hills have been increasing early Sunday
evening. Latest observations indicate widespread gusts out of the
north to northeast of between 25 and 45 mph. Isolated wind gusts
as high as 73 mph have been reported on mount saint helena near
the sonoma napa lake county line (elevation of 4300 feet). Winds
have also switched to the north and northeast in the valleys and
have increased with current gusts up to 25 mph. Mesoscale models,
most notably the local WRF model, indicate north to northeast
winds will be strongest between about 9 pm this evening and 3 am
Monday morning and then very gradually subside through midday
Monday. Red flag conditions will persist due to these winds, along
with very low relative humidity. Relative humidity (rh) values
are currently between about 15 and 25 percent in the north and
east bay hills, and the expectation is for almost no recovery
overnight. Rh values will then dip into the single digits during
the day Monday. The red flag warning for the north bay mountains
and east bay hills is in effect through noon Monday. Winds are
expected to decrease significantly by Monday afternoon. Winds will
remain offshore on Monday night and increase slightly with
perhaps isolated gusts up to 25 to 35 on the higher peaks in the
north bay. But winds Monday night are not expected to be nearly
as strong as tonight.

Warm and very dry conditions are forecast to continue through
much of the week as high pressure aloft remains near the northern
california coast and light offshore flow persists. However, winds
are expected to remain relatively light for the balance of the
week.

Marine As of 10:22 pm pdt Sunday... Strong offshore flow has
developed over the northern waters as an upper level trough over
the great basin deepens into southern california. Gusty northerly
winds can be expected in suisun bay and the west delta and over
the coastal waters near coastal gaps. A long period SW swell will
continue to move through the waters during the first half of the
week while a moderate period NW lump continues to roll through. A
longer period northwest swell will arrive during the second half
of the week.

Mtr watches warnings advisories
Tngt Wind advisory... Caz507
sca... Pt reyes to pigeon pt 0-10 nm from 2 am
sca... Sf bay
public forecast: dykema
aviation: W pi
marine: W pi
fire weather: rowe dykema
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PXOC1 - 9414311 - San Francisco (Pier 1), CA 8 mi43 min WNW 1 G 5.1 65°F 1016.5 hPa
FTPC1 - 9414290 - San Francisco, CA 9 mi43 min SSW 1.9 G 1.9 57°F 62°F1018 hPa
AAMC1 - 9414750 - Alameda, CA 9 mi43 min ESE 2.9 G 8.9 68°F 65°F1017.5 hPa
PXSC1 9 mi43 min 65°F 44°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 10 mi43 min NE 16 G 19 67°F 1017.2 hPa
OBXC1 10 mi43 min 67°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 10 mi43 min NNE 12 G 17
LNDC1 11 mi43 min NNE 13 G 20 69°F 1017.1 hPa
46237 - San Francisco Bar, CA (142) 14 mi43 min 59°F3 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 15 mi44 min WNW 2.9 63°F 1018 hPa
RTYC1 - 9414523 - Redwood City, CA 16 mi43 min WSW 1.9 G 4.1 63°F 68°F1018.4 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 16 mi43 min Calm G 1 67°F 1018.1 hPa
RCMC1 - 9414863 - Richmond, CA 17 mi43 min S 4.1 G 6 63°F 63°F1017.7 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 23 mi33 min NNE 5.8 G 7.8 58°F 58°F1017.9 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 27 mi43 min NE 1.9 G 5.1 64°F 1017.5 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi43 min SE 8.9 G 13 66°F 65°F1018.1 hPa25°F
PCOC1 - 9415144 - Port Chicago, CA 33 mi43 min NNE 16 G 18 66°F 65°F1017.7 hPa
PRYC1 - 9415020 - Point Reyes, CA 37 mi43 min NW 7 G 7 58°F1017.3 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 38 mi43 min NNE 12 G 15 64°F 1017.6 hPa
SFXC1 - San Francisco Bay Reserve, CA 42 mi88 min NE 23 69°F 1016 hPa

Wind History for Alameda, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA5 mi77 minNE 1310.00 miFair67°F36°F32%1017.4 hPa
Oakland, Metro Oakland International Airport, CA11 mi20 minNNE 1010.00 miFair65°F19°F17%1017.7 hPa
San Carlos Airport, CA14 mi18 minNW 710.00 miFair59°F24°F27%1017.9 hPa
Hayward, Hayward Air Terminal, CA16 mi19 minE 510.00 miFair60°F28°F31%1018.6 hPa

Wind History from SFO (wind in knots)
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Last 24hrCalmW3S4S6S7S8SW73NE4NE4NE3NW8NW10NW12W17W19W15W13W11W8S3W4S3NE13
1 day agoW4W5W7W5SW3W7NW4CalmN5N10W14W18NW16W20W17W16W15W11W9W10NW8W8W7SW3
2 days agoCalmCalmCalmCalmS3SE3E3NE5NE3N4CalmN4E3W15W16W17W17W14NW6NW7W7SW4CalmW4

Tide / Current Tables for Oyster Point Marina, San Francisco Bay, California
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Oyster Point Marina
Click for Map
Mon -- 06:39 AM PDT     5.55 feet High Tide
Mon -- 07:17 AM PDT     Sunrise
Mon -- 11:46 AM PDT     3.25 feet Low Tide
Mon -- 01:36 PM PDT     Moonrise
Mon -- 05:16 PM PDT     6.07 feet High Tide
Mon -- 06:31 PM PDT     Sunset
Mon -- 11:37 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.61.12344.95.45.55.14.53.83.43.33.64.35.15.76.15.95.34.33.11.91.1

Tide / Current Tables for Sierra Point 1.3 mi ENE, South San Francisco Bay, California Current
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Sierra Point 1.3 mi ENE
Click for Map
Mon -- 03:08 AM PDT     0.83 knots Max Flood
Mon -- 06:38 AM PDT     -0.01 knots Slack
Mon -- 07:17 AM PDT     Sunrise
Mon -- 08:58 AM PDT     -0.50 knots Max Ebb
Mon -- 12:10 PM PDT     0.00 knots Slack
Mon -- 01:36 PM PDT     Moonrise
Mon -- 02:49 PM PDT     0.46 knots Max Flood
Mon -- 05:38 PM PDT     -0.00 knots Slack
Mon -- 06:31 PM PDT     Sunset
Mon -- 09:09 PM PDT     -1.01 knots Max Ebb
Mon -- 11:37 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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00.40.70.80.80.60.3-0.1-0.4-0.5-0.4-0.3-00.20.40.50.40.2-0.1-0.5-0.8-1-0.9-0.7

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 (6,6,7,8)
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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.