Friday, July20, 2018 L-36.com


Marine Weather and Tides
Larkspur, CA

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 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.

Sunrise 6:02AMSunset 8:30PM Friday July 20, 2018 1:59 AM PDT (08:59 UTC) Moonrise 1:29PMMoonset 12:06AM Illumination 49% Phase: First Quarter Moon; Moon at 7 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 San Francisco Bay North Of The Bay Bridge- 902 Pm Pdt Thu Jul 19 2018
Tonight..SW winds 10 to 20 kt.
Fri..SW winds 5 to 15 kt...increasing to 15 to 25 kt in the afternoon. Slight chance of Thunderstorms in the afternoon.
Fri night..SW winds 10 to 20 kt with gusts up to 30 kt. A slight chance of showers and Thunderstorms.
Sat..SW winds 10 to 20 kt with gusts up to 25 kt.
Sat night..SW winds 10 to 20 kt with gusts up to 25 kt.
Sun..SW winds 10 to 20 kt with gusts up to 30 kt.
Sun night..W winds 10 to 20 kt with gusts up to 30 kt.
Mon..W winds 10 to 20 kt.
Tue..W winds 10 to 20 kt.
PZZ500 902 Pm Pdt Thu Jul 19 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... North northwesterly winds will gradually become more southerly through Friday as a weak low pressure system develops off the coast. In the meantime, gusty north northwesterly winds will persist north of point reyes. Monsoonal moisture entering from the southeast will lead to a very slight chance of Thunderstorms Friday. A southerly swell will arrive Saturday night and continue through early next week.

7 Day Forecast for Marine Location Near Larkspur, CA
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location: 37.94, -122.53     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 200555
afdmtr
area forecast discussion
national weather service san francisco bay area
1055 pm pdt Thu jul 19 2018

Synopsis Monsoon moisture is expected to spread from south to
north across the region late tonight and Friday, resulting in a
slight chance of high-based showers and thunderstorms. Meanwhile,
seasonably warm daytime temperatures will persist region-wide
with marine air keeping conditions cooler near the coast. A more
robust warming trend is then possible next week, especially for
inland areas, as high pressure builds over the region.

Discussion As of 8:55 pm pdt Thursday... As has been the case
the past several days, today was another warm day inland, with
temperatures in the inland valleys from 5 to 10 degrees above
normal. Meanwhile, a persistent marine layer with a depth of about
1500 feet, along with continued onshore flow, kept coastal
temperatures near seasonal averages. No significant changes to
this temperature pattern are expected through the weekend and into
early next week.

Primary forecast concern in the short-term is monsoon moisture
that continues to flow up from the southeast. Moisture today was
primary confined to our east and southwest, with the bulk of the
monsoon moisture over the southern sierra and well offshore.

Models generally agree that another pulse of mid upper level
moisture and instability will move from southeast to northwest
across our area from late tonight through Friday. Based on the 00z
nam, this incoming moisture instability will not spread north as
quickly as previously forecast. Therefore, a forecast update
earlier this evening included confining slight shower thunderstorm
chances only to areas south of monterey bay late tonight, to
areas south of san jose on Friday morning, and to areas south of
santa rosa on Friday afternoon. Also, both the NAM and GFS agree
that convective precipitation potential will be highest across the
south and become less likely farther to the north.

An increase in mid upper level clouds tomorrow will likely result
in slight cooling in most places. At the same time, look for this
increased moisture to result in warmer nights, particularly on
Friday night.

Drier southwest flow aloft will develop by the weekend, which will
bring an end to precipitation chances.

A large upper high that dominates the the southwestern united
states is currently centered near the new mexico texas border.

Models agree that this high will slowly retrograde over the next
week and be centered over southern california by a week from
today. This will likely mean warmer temperatures inland by the
middle of next week. But onshore flow is projected to persist
through the week, keeping coastal areas mild.

Aviation As of 10:50 pm pdt Thursday... For 06z tafs... Ceiling
onset occurred in the early evening at the monterey bay
terminals, whileVFR conditions continue at all san francisco bay
area terminals. Marine stratus is moving into the coastal valleys
a bit slower than yesterday evening, but still think ceiling
development likely at all terminals but ksjc and klvk during the
overnight hours. Clearing Friday morning looks to occur by
midmorning around sf bay and late morning monterey bay. The marine
layer depth is remaining pretty steady and shallow, with latest
coastal profiler data and ksql sodar indicating an inversion
height in the 900 to 1300 foot range. Some upper level moisture
and instability is projected to spread over the area from the se
on Friday and result in a slight chance of thunderstorms.

Vicinity of ksfo... Low-to-moderate confidence in projected late-
night ceiling development. Higher confidence inVFR conditions
prevailing after about 16z Friday.

Sfo bridge approach... Similar to sfo.

Monterey bay terminals... High confidence ceilings will continue
through at least midmorning on Friday, but lower confidence in
details of height and visibility variation.

Marine As of 08:57 am pdt Thursday... Light to moderate winds
will once again prevail over the coastal waters. Winds will be
locally stronger north of point reyes. Winds along the coast will
turn southerly on Friday as low pressure develops off the southern
california coast. Monsoonal moisture from the SE will leave a
very slight chance of thunderstorms Thursday and Friday. A
southerly swell will arrive Saturday night and continue through
early next week.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pigeon pt 10-60 nm
public forecast: dykema
aviation: blier
marine: blier
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RCMC1 - 9414863 - Richmond, CA 6 mi48 min SSW 4.1 G 8.9 59°F 65°F1012 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 9 mi48 min SW 9.9 G 15 59°F 1012.3 hPa
FTPC1 - 9414290 - San Francisco, CA 10 mi48 min W 4.1 G 14 58°F 60°F1012.5 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 12 mi42 min WSW 6 G 11 58°F 1011.1 hPa
46237 - San Francisco Bar, CA (142) 12 mi60 min 59°F4 ft
PXSC1 12 mi48 min 59°F 58°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 14 mi48 min WNW 1.9 G 4.1
OBXC1 14 mi42 min 60°F 58°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 14 mi42 min WNW 4.1 G 6 59°F 1012.1 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 16 mi42 min WSW 12 G 16 59°F 1011.5 hPa
AAMC1 - 9414750 - Alameda, CA 17 mi48 min WNW 4.1 G 7 59°F 71°F1012.3 hPa
LNDC1 17 mi42 min NNW 4.1 G 6 60°F 1012 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 21 mi40 min S 9.7 G 14 57°F 58°F1012.9 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 22 mi42 min 69°F
PRYC1 - 9415020 - Point Reyes, CA 24 mi48 min ESE 9.9 G 14 60°F1011.9 hPa
PCOC1 - 9415144 - Port Chicago, CA 27 mi42 min W 24 G 27 60°F 69°F1010.4 hPa
SFXC1 - San Francisco Bay Reserve, CA 32 mi75 min NW 13 60°F 1010 hPa52°F
RTYC1 - 9414523 - Redwood City, CA 34 mi42 min NNW 2.9 G 4.1 61°F 74°F1012.3 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 35 mi42 min NW 18 G 24 63°F 1009.4 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 44 mi70 min S 5.8 G 9.7 56°F 61°F7 ft1013.1 hPa (+0.0)
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 46 mi40 min SSE 5.8 G 9.7 56°F1012.5 hPa

Wind History for Richmond, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA14 mi65 minno data10.00 miFair54°F50°F88%1011.8 hPa
Petaluma Municipal Airport, CA22 mi65 minVar 35.00 miFog/Mist54°F53°F100%1012.2 hPa
Oakland, Metro Oakland International Airport, CA23 mi67 minNNW 610.00 miA Few Clouds58°F55°F93%1012.2 hPa
Napa, Napa County Airport, CA23 mi66 minS 610.00 miFair60°F55°F86%1010.8 hPa
San Francisco, San Francisco International Airport, CA24 mi64 minWNW 610.00 miA Few Clouds58°F53°F84%1011.9 hPa

Wind History from DVO (wind in knots)
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Last 24hrNW6CalmCalmNW4NW7CalmCalmCalmN4Calm54NE6
G12
NE116N12
G19
N14N11N11N8N8N7N7N6
1 day agoNW3N4NW4CalmCalmCalmCalmCalmCalm4Calm5
G10
E66N14N14N11N10N13N12N10N9N7N8
2 days agoCalmCalmN4CalmCalmCalm4CalmNE54Calm5N9
G14
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N13N14N12N11N11N11N10N6NW7N6

Tide / Current Tables for Corte Madera Creek, San Francisco Bay, California
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Corte Madera Creek
Click for Map
Fri -- 01:05 AM PDT     Moonset
Fri -- 01:35 AM PDT     1.24 feet Low Tide
Fri -- 06:03 AM PDT     Sunrise
Fri -- 07:26 AM PDT     4.11 feet High Tide
Fri -- 01:06 PM PDT     1.47 feet Low Tide
Fri -- 02:28 PM PDT     Moonrise
Fri -- 07:45 PM PDT     5.99 feet High Tide
Fri -- 08:28 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.81.31.31.72.333.74.14.13.732.31.71.51.72.33.24.25.25.865.64.73.6

Tide / Current Tables for Point San Quentin 1.9 mi E, San Francisco Bay, California Current
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Point San Quentin 1.9 mi E
Click for Map
Fri -- 01:05 AM PDT     Moonset
Fri -- 03:33 AM PDT     0.01 knots Slack
Fri -- 06:03 AM PDT     Sunrise
Fri -- 06:15 AM PDT     1.16 knots Max Flood
Fri -- 09:04 AM PDT     -0.00 knots Slack
Fri -- 11:48 AM PDT     -1.37 knots Max Ebb
Fri -- 02:28 PM PDT     Moonrise
Fri -- 03:24 PM PDT     0.01 knots Slack
Fri -- 06:18 PM PDT     1.31 knots Max Flood
Fri -- 08:28 PM PDT     Sunset
Fri -- 09:15 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.9-1.7-1.2-0.50.30.91.21.10.70.1-0.7-1.3-1.4-1.2-0.8-0.30.411.31.20.90.2-0.7-1.6

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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (4,6,7,8)
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Ground Weather Radar Station Sacramento, 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.