Tuesday, October22, 2019 L-36.com


Marine Weather and Tides
Colma, CA

Version 3.4
NOTICE
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:23AMSunset 6:24PM Tuesday October 22, 2019 4:56 PM PDT (23:56 UTC) Moonrise 12:00AMMoonset 2:28PM Illumination 31% Phase: Waning Crescent; Moon at 24 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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PZZ530 San Pablo Bay, Suisun Bay, The West Delta And The San Francisco Bay North Of The Bay Bridge- 243 Pm Pdt Tue Oct 22 2019
Tonight..SW winds up to 10 kt.
Wed..NW winds up to 10 kt.
Wed night..N winds 5 to 10 kt with gusts up to 30 kt.
Thu..NE winds 5 to 15 kt with gusts up to 25 kt.
Thu night..NE winds around 5 kt.
Fri..NE winds around 5 kt.
Fri night..W winds around 5 kt.
Sat..NW winds up to 10 kt.
Sun..N winds 5 to 10 kt.
PZZ500 243 Pm Pdt Tue Oct 22 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure over the eastern pacific and pacific northwest will produce moderate northerly winds across the coastal waters through midweek. The strongest winds are expected across the northern outer waters. As high pressure builds over the great basin, a thermal trough will develop along the coast. This will result in light offshore flow across the coastal waters. A moderate northwest swell will continue through midweek.


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 222329
afdmtr
area forecast discussion
national weather service san francisco bay area
429 pm pdt Tue oct 22 2019

Synopsis A warming and drying trend will continue through
the week as high pressure strengthens over california. Offshore
flow will continue through midweek and strengthen Wednesday night
into Thursday morning. This will result in warm temperatures
reaching all the way to the coast, with the warmest temperatures
expected on Thursday. Locally gusty offshore winds are likely at
times in the hills, especially in the north bay hills on Wednesday
night. In the longer range, cooling is forecast during the
upcoming weekend, although another round of dry offshore winds
is possible by late in the weekend and into early next week.

Discussion As of 1:35 pm pdt Tuesday... With light offshore
flow and sunny skies, afternoon temperatures have warmed into the
upper 70s to mid 80s across the board. Earlier today the
temperature rose to 86 degrees at the weather office in monterey,
but a light seabreeze has cooled it back down to the mid 70s.

The upper ridge is progged to weaken somewhat on Wednesday, so
high temperatures should be similar to today's or slightly cooler.

Highs are forecast to range from the mid to upper 70s at the
coast, to the 80s to lower 90s inland. The warmest day is expected
to be on Thursday when the ridge axis is centered over
california. Highs that day are expected to be a couple degrees
warmer than those expected on Wednesday.

In addition to warming temperatures, the offshore flow will bring
much drier air to the area. These factors coupled with increasing
winds in the hills will produce critical fire weather potential.

Red flag warnings have been issued for the north and east bay,
plus the santa cruz mountains. Please see the fire weather
discussion below for the specifics.

The offshore surface pressure gradient will weaken by Friday as
the upper level ridge weakens. High temperatures will moderate
going into the weekend as an upper level trough moves across the
pacific nw. This trough is then forecast to dig into the great
basin setting up another potential offshore flow event for Sunday.

Temperatures to remain near seasonal normals through the early
part of next week.

Aviation As of 04:29 pm pdt Tuesday... For 00z tafs.VFR
conditions to prevail as high pressure and light offshore winds
keep clear skies over the terminals through the forecast period.

Onshore winds around 10-15 kt this afternoon along the coast with
offshore winds inland. Winds will diminish in the overnight hours.

Similar winds expected tomorrow afternoon.

Vicinity of ksfo...VFR. Onshore winds 10-15 kt will persist into
the early evening before winds diminish. Expect winds to turn
offshore again tomorrow morning, but remain fairly light. Onshore
winds to return by tomorrow afternoon.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR. W to NW winds around 5 to 15 kt will
diminish and turn southerly overnight. Onshore winds to return
tomorrow afternoon.

Fire weather As of 12:45 pm pdt Tuesday... All fire weather
watches have been upgraded to red flag warnings. In addition the
north bay coast and valleys were added to the warning as well as
the east bay interior valleys. Timing is to for warnings to start
in the north bay first, around midday weds which accounts for the
peak daytime heating as well as the synoptic timing of the wind
event. In a subtle but important break from normal the winds do
start to arrive before sunset and the development of the usual
nighttime inversions. This should allow some of the winds to be
noticed by weds afternoon and evening across the north bay hills
as well as down into the valleys. The strongest offshore winds
then sweep over the rest of the east bay and santa cruz mountains
weds night into Thursday morning. The event looks to be on the
moderate to a low end "high event" in terms of intensity. Cool
advection and upper forcing for downward momentum look marginal
with the best surface pressure gradient over the sierra. However
winds at the 925 mb (ridgetop) level look strong and we will be
going into the event after several hot weather days with very low
humidity. In fact humidity values should slowly drop through the
night weds into early Thursday morning. Fuel analysis shows all
fuel components: live, dead, fine, heavy, etc ready for
consumption. Climatology and fire history including the oakland
hills fire (oct 19 20th 1991) as always send an important message
worth studying to avoid repeat performances.

Red flags are up through Thursday afternoon. Winds will rapidly
ease by Thursday evening. However, humidity will remain very low
right through Friday with continued light offshore winds. Given
the ongoing impacts seems the prudent thing to do will be to let
the red flag end by Thursday and then ride through the long
duration low humidity time frame when ignitions will still be
likely but easier to catch.

All eyes then turn towards a potentially stronger event Saturday
night into Sunday. Model spreads at 4-5 day window still large
enough to keep confidence in the moderate category. However,
potential is there for high end wind event. Pressure gradients
looks much stronger with cold advection and upper support
suggesting more widespread wind potential. Current timing suggests
late Saturday night into Sunday. Temperatures would be cooler
with humidity perhaps slightly higher but winds potentially much
stronger.

We realize there becomes public and fire manager fatigue factor
in dealing with multiple events and discerning the different
intensity levels. During the fall of 2017 we had 2-3 moderate
intensity red flag events before the devastating wine country
fires. Should we be lucky enough to get through tomorrows wind
event would ask for continued vigilance heading into the weekend
wind event.

Marine As of 02:43 pm pdt Tuesday... High pressure over the
eastern pacific and pacific northwest will produce moderate
northerly winds across the coastal waters through midweek. The
strongest winds are expected across the northern outer waters. As
high pressure builds over the great basin, a thermal trough will
develop along the coast. This will result in light offshore flow
across the coastal waters. A moderate northwest swell will
continue through midweek.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pigeon pt 10-60 nm
sca... Pt arena to pt reyes 0-10 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
public forecast: sims
aviation: as
marine: st
fire weather: walbrun
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 mi56 min WSW 6 G 8 81°F 1017.8 hPa
PXSC1 9 mi62 min 80°F 45°F
AAMC1 - 9414750 - Alameda, CA 9 mi62 min W 8 G 9.9 78°F 63°F1019 hPa
FTPC1 - 9414290 - San Francisco, CA 9 mi62 min W 11 G 13 73°F 58°F1019.2 hPa
OBXC1 10 mi56 min 73°F 50°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 10 mi56 min WNW 11 G 12 70°F 1018.5 hPa (-2.7)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 10 mi56 min W 12 G 13
LNDC1 11 mi56 min W 7 G 8.9 82°F 1018.5 hPa (-2.7)
46237 - San Francisco Bar, CA (142) 14 mi56 min 59°F5 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 15 mi45 min Calm 76°F 1018 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 16 mi74 min W 4.1 G 5.1 75°F 1019.3 hPa
RTYC1 - 9414523 - Redwood City, CA 16 mi56 min NW 8 G 11 83°F 66°F1019.2 hPa (-2.8)
RCMC1 - 9414863 - Richmond, CA 17 mi62 min E 1 G 1.9 75°F 60°F1018.6 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 23 mi36 min NW 7.8 G 9.7 56°F 54°F1019.6 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 27 mi56 min E 7 G 12 81°F 1018.2 hPa (-3.0)
UPBC1 29 mi56 min ESE 2.9 G 4.1
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi56 min NNW 1.9 G 1.9 79°F 64°F1018.8 hPa (-2.8)
PCOC1 - 9415144 - Port Chicago, CA 33 mi56 min ENE 5.1 G 6 81°F 63°F1018.8 hPa (-2.8)
PRYC1 - 9415020 - Point Reyes, CA 37 mi56 min 54°F1019.1 hPa (-2.4)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 38 mi56 min SSE 1.9 G 1.9 83°F 1018.6 hPa (-2.7)
SFXC1 - San Francisco Bay Reserve, CA 42 mi71 min SW 5.1 82°F 1019 hPa49°F

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 mi2 hrsVar 310.00 miA Few Clouds77°F54°F45%1018.8 hPa
Oakland, Metro Oakland International Airport, CA11 mi63 minW 810.00 miA Few Clouds80°F52°F38%1018.7 hPa
Half Moon Bay Airport, CA12 mi61 minNNW 1310.00 miFair73°F46°F38%1019 hPa
San Carlos Airport, CA14 mi2.2 hrsWNW 810.00 miClear84°F39°F20%1019.3 hPa
Hayward, Hayward Air Terminal, CA16 mi62 minWNW 910.00 miFair84°F46°F27%1019.1 hPa
Palo Alto Airport, CA21 mi69 minNE 510.00 miClear79°F53°F42%1019 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hrW13W13W13NW5SW3CalmW53NW4W3S3CalmCalmCalmCalmCalmN3N4NE3N5N6E33W10
1 day agoW15W18W15W15W17W13W12W5SW3SW3W3CalmS5SW3CalmW4CalmCalm3CalmNE3N3E3W9
2 days agoW10W10W8W11W12W7NW6NW3CalmNW4CalmSW3CalmNW3SW3S3CalmCalmE4E5W12W14W17W18

Tide / Current Tables for South San Francisco, San Francisco Bay, California
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South San Francisco
Click for Map
Tue -- 12:49 AM PDT     Moonrise
Tue -- 01:35 AM PDT     0.09 feet Low Tide
Tue -- 07:24 AM PDT     Sunrise
Tue -- 08:56 AM PDT     6.03 feet High Tide
Tue -- 02:13 PM PDT     2.89 feet Low Tide
Tue -- 03:27 PM PDT     Moonset
Tue -- 06:22 PM PDT     Sunset
Tue -- 07:35 PM PDT     6.46 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.80.20.10.71.62.73.955.865.74.943.32.93.13.74.75.76.36.45.94.93.5

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
Tue -- 12:49 AM PDT     Moonrise
Tue -- 01:57 AM PDT     0.01 knots Slack
Tue -- 05:15 AM PDT     0.94 knots Max Flood
Tue -- 07:24 AM PDT     Sunrise
Tue -- 08:51 AM PDT     -0.01 knots Slack
Tue -- 11:20 AM PDT     -0.63 knots Max Ebb
Tue -- 02:23 PM PDT     0.00 knots Slack
Tue -- 03:27 PM PDT     Moonset
Tue -- 05:10 PM PDT     0.59 knots Max Flood
Tue -- 06:22 PM PDT     Sunset
Tue -- 07:59 PM PDT     -0.00 knots Slack
Tue -- 11:32 PM PDT     -1.20 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.8-0.400.40.80.90.90.70.4-0.1-0.4-0.6-0.6-0.4-0.10.20.50.60.50.3-0-0.4-0.9-1.2

Weather Map
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GEOS 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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Other links: Northern Pacific     Contential US     Full GOES-East
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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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.