Saturday, July22, 2017 L-36.com


Marine Weather and Tides
Pacifica, CA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 6:05AMSunset 8:27PM Saturday July 22, 2017 3:56 AM PDT (10:56 UTC) Moonrise 4:21AMMoonset 6:57PM Illumination 2% Phase: Waning Crescent; Moon at 28 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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PZZ545 Point Reyes To Pigeon Point To 10 Nm- 228 Am Pdt Sat Jul 22 2017
.small craft advisory in effect until 3 am pdt early this morning...
Today..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 4 to 6 ft at 8 seconds. Patchy fog in the morning.
Tonight..W winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 4 to 6 ft at 8 seconds. Patchy fog after midnight.
Sun..S winds 10 kt. Wind waves 2 ft or less. NW swell 4 to 6 ft at 8 seconds. Patchy fog in the morning.
Sun night..S winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 5 ft at 9 seconds. Patchy fog after midnight. Patchy drizzle after midnight.
Mon..S winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 4 to 6 ft at 9 seconds. Patchy fog. Patchy drizzle in the morning. Patchy drizzle after midnight.
Tue..S winds 5 to 15 kt. Wind waves 1 to 3 ft...becoming 2 ft or less. NW swell 3 to 5 ft. Patchy fog.
Wed..W winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 4 to 6 ft. Patchy fog.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 5 to 7 ft with a dominant swell period of 8 seconds. Across the bar...combined seas 6 to 8 ft with a dominant swell period of 8 seconds. Maximum ebb current of 2.1 knots at 02:18 am Saturday and 1 knots at 03:30 pm Saturday.
PZZ500 228 Am Pdt Sat Jul 22 2017
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 will shift to the northwest today as a thermal trough extends towards the central coast of california. As a result, winds will begin to decrease for most of the coastal waters. The northern outer waters, however, will remain gusty through the weekend.

7 Day Forecast for Marine Location Near Pacifica, CA
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location: 37.62, -122.51     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 220531
afdmtr
area forecast discussion
national weather service san francisco bay area
1031 pm pdt Fri jul 21 2017

Synopsis Temperatures will continue to warm into the weekend as
an upper level ridge of high pressure strengthens over california.

Temperatures will moderate next week as the ridge progresses to
the east.

Discussion As of 9:20 pm pdt Friday... Our expected warming
trend got off to a very tentative start today as afternoon highs
in most locations were only a few degrees warmer than yesterday.

Warming is expected to be more robust on Saturday as the upper
ridge centered over the desert southwest continues to build to the
west and over california. The marine layer, currently at a depth
of about 1500 feet per fort ord profiler data, is expected to
compress by tomorrow and the overlying airmass is forecast to warm
by a couple of degrees c. In addition, models indicate that winds
near the top of the boundary layer will veer from westerly to
northerly by tomorrow morning which should help bring drier air
into the lower levels by then. Our current forecast calls for
warming of about 5 to 10 degrees tomorrow, which seems about
right. Afternoon highs tomorrow will warm into the 90s in the
inland valleys and in the hills above 1000 feet. Meanwhile,
continued onshore surface flow will keep coastal areas seasonably
cool with highs mainly in the upper 60s and 70s. Late night and
morning low clouds are expected to remain patchy in the short-
term, and confined mainly to areas near the coast.

Although the airmass over our region is forecast to remain warm
going into Sunday, the development of southerly flow by then will
mean at least slight cooling for most locations during the second
half of the weekend, with more significant cooling expected in
locations such as the north bay valleys and coastal santa cruz
county.

Warmer weather this weekend will raise heat risks into the
moderate category for many inland areas, especially on Saturday.

However, we are not expecting temperatures this weekend to be
nearly as oppressive as last weekend.

An upper level low is forecast to develop just off the northern
california coast by late Sunday, remain there through Monday, and
then shift inland across northern california by late Tuesday or
Tuesday night. At the same time, the upper ridge will retreat to
the east. These developments will result widespread cooling
across inland areas during the first few days of the work week.

Temperatures are then expected to warm gradually during the second
half of the week.

Southerly flow late in the weekend and into the early part of next
week may bring mid upper level monsoon moisture over our area.

Due to model inconsistencies, there is currently a quite a bit of
uncertainty as to whether this moisture will make it far enough
west for any chance of showers thunderstorms in our area. The 00z
nam keeps the bulk of the monsoon moisture and mid level
instability to our east, but it's certainly close enough to watch
carefully for any signs this may shift farther to the west.

Aviation As of 10:30 pm pdt Friday... Similar conditions to
yesterday with the marine layer near 1000 feet and a strong n-s
gradient. Stratus has started to develop along the coast and will
spread into the mry bay area terminals and through the golden gate
into oak and possibly sfo early Saturday morning.

Vicinity of ksfo...VFR. Possible MVFR CIGS between 12z and 16z.

West winds gusting to 28 kt through 04z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Ifr CIGS over mry spreading into sns by
12z. Clearing by 17z.

Marine As of 10:30 pm pdt Friday... A 1027 mb high 750 miles
west of point pinos will move northwest on Saturday as a thermal
trough extends towards the central coast. This will result in
decreasing winds over the coastal waters except for the northern
outer waters.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pt reyes 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... Pt reyes to pigeon pt 0-10 nm until 3 am
public forecast: dykema
aviation: W pi
marine: W pi
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTPC1 - 9414290 - San Francisco, CA 13 mi39 min WSW 6 G 11 55°F 57°F1013.6 hPa
46237 - San Francisco Bar, CA (142) 13 mi57 min 54°F4 ft
PXSC1 14 mi39 min 57°F 53°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 14 mi39 min Calm G 1.9 56°F 1012.2 hPa
AAMC1 - 9414750 - Alameda, CA 15 mi39 min WSW 2.9 G 6 58°F 69°F1013.7 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 16 mi39 min SW 11 G 12
OBXC1 16 mi39 min 57°F 54°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi39 min SW 5.1 G 8 57°F 1013.3 hPa
LNDC1 17 mi39 min WSW 5.1 G 7 58°F 1013.3 hPa
RTYC1 - 9414523 - Redwood City, CA 18 mi39 min S 4.1 G 5.1 60°F 73°F1012.8 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 20 mi67 min W 3.9 G 3.9 53°F 51°F6 ft1013.6 hPa (-0.8)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 21 mi39 min SSW 11 G 15 57°F 1013.3 hPa
RCMC1 - 9414863 - Richmond, CA 22 mi39 min S 8 G 13 56°F 63°F1012.9 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 26 mi67 min WNW 7.8 G 9.7 56°F 57°F5 ft1013.8 hPa (-1.0)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 33 mi39 min WSW 8 G 11 60°F 1012.2 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 35 mi39 min WNW 11 G 13 60°F 68°F1012.6 hPa58°F
PRYC1 - 9415020 - Point Reyes, CA 36 mi39 min W 6 G 8.9 57°F 53°F1012.8 hPa
PCOC1 - 9415144 - Port Chicago, CA 39 mi39 min W 14 G 16 60°F 70°F1012 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 44 mi39 min NW 11 G 15 65°F 1010.8 hPa
SFXC1 - San Francisco Bay Reserve, CA 48 mi72 min W 12 60°F 1011 hPa56°F

Wind History for San Francisco, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA8 mi62 minSSW 37.00 miOvercast55°F51°F88%1013.2 hPa
San Francisco, San Francisco International Airport, CA8 mi61 minWNW 610.00 miFair57°F51°F81%1013.3 hPa
San Carlos Airport, CA15 mi67 minWSW 310.00 miFair59°F53°F82%1013.9 hPa
Oakland, Metro Oakland International Airport, CA16 mi64 minN 410.00 miA Few Clouds57°F54°F90%1013.5 hPa
Hayward, Hayward Air Terminal, CA21 mi63 minN 410.00 miFair60°F51°F72%1014.3 hPa

Wind History from HAF (wind in knots)
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Last 24hrNW3NW4NW7NW6NW6NW5NW6W8NW11NW11NW13NW12
G17
NW7NW9NW7NW8NW5NW4CalmCalmCalmSW3CalmS4
1 day agoNW7NW6NW9NW5NW7NW7NW9NW10NW8NW9--NW10
G15
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NW9--NW7NW5NW6NW8
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2 days agoCalmNW3CalmW3W4W7W8W7W7NW10
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Tide / Current Tables for Seaplane Harbor, San Francisco Bay, California
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Seaplane Harbor
Click for Map
Sat -- 05:20 AM PDT     Moonrise
Sat -- 06:05 AM PDT     Sunrise
Sat -- 06:21 AM PDT     -1.26 feet Low Tide
Sat -- 01:10 PM PDT     6.52 feet High Tide
Sat -- 06:07 PM PDT     2.32 feet Low Tide
Sat -- 07:56 PM PDT     Moonset
Sat -- 08:26 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
8.17.15.23.11-0.5-1.2-1.1-0.21.32.94.65.96.56.25.23.92.82.32.63.75.26.77.9

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
Sat -- 03:10 AM PDT     -1.72 knots Max Ebb
Sat -- 05:20 AM PDT     Moonrise
Sat -- 06:05 AM PDT     Sunrise
Sat -- 06:35 AM PDT     0.01 knots Slack
Sat -- 09:51 AM PDT     1.37 knots Max Flood
Sat -- 01:13 PM PDT     -0.01 knots Slack
Sat -- 03:48 PM PDT     -0.87 knots Max Ebb
Sat -- 06:27 PM PDT     0.00 knots Slack
Sat -- 07:56 PM PDT     Moonset
Sat -- 08:26 PM PDT     Sunset
Sat -- 09:31 PM PDT     1.06 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.3-1-1.5-1.7-1.6-1.2-0.50.30.91.31.41.20.80.1-0.4-0.8-0.9-0.7-0.30.30.7110.8

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of CentralWestCoast    EDIT
Geos

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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weather_mapweather_map weather_map

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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.