Saturday, July21, 2018 L-36.com


Marine Weather and Tides
Muir Beach, CA

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What's New / NOTES
7/21/2018 Trying to make page Mobile Friendly

Sunrise 6:04AMSunset 8:28PM Saturday July 21, 2018 8:13 PM PDT (03:13 UTC) Moonrise 2:28PMMoonset 12:39AM Illumination 68% Phase: Waxing Gibbous; Moon at 9 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 Coastal Waters From Point Reyes To Pigeon Point California Out To 10 Nm- 154 Pm Pdt Sat Jul 21 2018
Tonight..S winds up to 10 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft at 10 seconds. Patchy fog after midnight.
Sun..SW winds up to 10 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft at 10 seconds and sw around 3 ft at 18 seconds. Patchy fog.
Sun night..W winds up to 10 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft at 9 seconds and sw around 3 ft at 17 seconds. Patchy fog.
Mon..NW winds 5 to 15 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. NW swell around 3 ft at 9 seconds and sw around 3 ft at 21 seconds. Patchy fog.
Mon night..NW winds 5 to 15 kt with gusts up to 25 kt. Wind waves 3 to 5 ft. NW swell around 3 ft at 8 seconds and sw 3 to 5 ft at 21 seconds. Patchy fog.
Tue..W winds 5 to 15 kt with gusts up to 25 kt. Wind waves 2 ft or less. SWell sw 3 to 5 ft. Patchy fog.
Tue night..W winds 5 to 15 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. SWell sw 3 to 5 ft. Patchy fog.
Wed..NW winds 5 to 15 kt. Wind waves 2 ft or less. SWell sw 3 to 4 ft. Patchy fog.
Thu..NW winds 10 to 20 kt. Wind waves 3 to 4 ft. SWell sw around 3 ft. Patchy fog.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 2 to 4 ft with a dominant period of 10 seconds. Across the bar...combined seas 3 to 5 ft with a dominant period of 10 seconds. Maximum ebb current of 2.6 knots at 12:13 am Sunday and 1.5 knots at 12:31 pm Sunday.
PZZ500 154 Pm Pdt Sat Jul 21 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A weak low pressure system off the coast will produce light to moderate winds over the coastal waters this weekend. Northwesterly winds are then forecast to increase through much of the coming week. Two long period southerly swells will impact the region this weekend and early next week.

7 Day Forecast for Marine Location Near Muir Beach, CA
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location: 37.78, -122.67     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 212330
afdmtr
area forecast discussion
national weather service san francisco bay area
430 pm pdt Sat jul 21 2018

Synopsis Seasonable conditions will remain in place through
Monday. High pressure will build over the region for the middle
part of the week bringing hot temperatures to interior areas and
in the mountains.

Discussion As of 01:57 pm pdt Saturday... A few clouds continue
to stream over the bay area and monterey bay regions this
afternoon as seen on visible satellite, while day time high temps
continue to warm to seasonable norms. Sunday and Monday will
continue to reflect normal july conditions with low clouds and fog
along the coast overnight and near normal temps across the region
each day. Monsoonal moistures remains to our east, mainly
impacting the sierras.

The area of forecast for this afternoons forecast package is the
heat that will creep into the area Tuesday through Thursday. 500
mb high pressure over the 4 corners region will drift to the west
the next couple days, then set up shop near the ca az border. As
it makes the shift the high pressure will strengthen to near 599
dam, ridging into the bay area region and causing subsidence in
the air column. As this pattern sets up looking for a quick heat
up on Tuesday and remaining into Thursday. Since our area of
responsibility will be on the edge of the heat dome, the main
areas of focus will be for the SE portion of monterey county, most
of san benito county, and the eastern portion of santa clara
county. It will also cook for the far NE portion of napa county
Tuesday and Wednesday. Onshore flow is expected to remain in place
and keep the remainder of the bay area only a little above
seasonal averages. We will be watching how the winds are shaping
up over the coming days. If the winds calm on Tuesday Wednesday
afternoon, effectively eliminating the onshore push, temps could
ramp up in the bay area core. Models are not indicating this
currently, but bears watching. With this synoptic scale pattern
change coming and the ridge bringing in 850 mb temps around 25c,
we went ahead and took the preemptive step of issuing a heat
advisory with significant lead time. The heat advisory will start
around 11 am on Tuesday and run through Wednesday at 9 pm. Due to
the warm airmass aloft, the overnight lows in the hills and
mountains will be rather high, likely in the 70s and low 80s.

Valleys will dip into the 50s and 60s, so the heat recovery
overnight will be for lower elevations. This is why the heat
advisory covers mainly elevated terrain. If models hold true, the
heat advisory may need to be extended into Thursday, as it looks
much like the setup taking place on Tuesday.

Friday will bring a noticeable change as the dome of high
pressure is forecast to shift to the east again due to low
pressure moving into the pac nw. This pattern will help to shift
the heat out and bring the region back into seasonable norms.

Overall... Typical july conditions Sunday Monday followed by an
interior heat up Tuesday through Thursday with a week punctuated
by a return to seasonal norms.

Aviation As of 4:30 pm pdt Saturday... For 00z tafs. Conditions
this evening similar to last evening with early return of ifr
ceilings at kmry and ksts. Ifr ceilings likely to develop at ksts
and koak by around 08z. Ksjc and klvk expected to remainVFR
overnight. Most uncertain forecast is once again for ksfo where
low ceilings may develop, but most likely late and around 12z.

Otherwise, expect clearing on Sunday to occur by 17z in most
areas. Light to moderate onshore winds.

Vicinity of ksfo...VFR for most of period. Ifr ceilings may
develop between 12-16z but confidence is rather low. West winds
up to 20 knots through early evening, otherwise light winds.

Sfo bridge approach... Similar to sfo.

Monterey bay terminals... Ifr ceilings likely by 01z and continuing
through 17z Sunday. Light winds.

Marine As of 01:57 pm pdt Saturday... A weak low pressure system
off the coast will produce light to moderate winds over the
coastal waters this weekend. Northwesterly winds are then forecast
to increase through much of the coming week. Two long period
southerly swells will impact the region this weekend and early
next week.

Mtr watches warnings advisories
Tngt Sca... Sf bay until 10 pm
public forecast: bfg
aviation: dykema
marine: mm
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46237 - San Francisco Bar, CA (142) 2 mi74 min 61°F3 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 9 mi34 min WSW 5.8 G 7.8 60°F 1016.9 hPa
FTPC1 - 9414290 - San Francisco, CA 11 mi44 min W 7 G 9.9
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi44 min WSW 9.9 G 14 62°F 1015.1 hPa
PXSC1 15 mi44 min 63°F 60°F
RCMC1 - 9414863 - Richmond, CA 17 mi44 min SSW 6 G 9.9
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi44 min WSW 13 G 17
OKXC1 - 9414776 - Oakland (Berth 34), CA 18 mi44 min W 11 G 12 62°F 1016 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 18 mi44 min SW 8.9 G 13 63°F 1016 hPa
OBXC1 18 mi44 min 63°F 61°F
AAMC1 - 9414750 - Alameda, CA 20 mi44 min W 8 G 13
LNDC1 21 mi44 min W 7 G 12 64°F 1016.1 hPa
PRYC1 - 9415020 - Point Reyes, CA 22 mi44 min NW 1 G 6 62°F1016.3 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 29 mi44 min SW 17 G 19 68°F 1014.1 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 31 mi84 min WSW 5.8 G 7.8 61°F 61°F6 ft1016.6 hPa (+0.0)
RTYC1 - 9414523 - Redwood City, CA 31 mi44 min NW 11 G 13 66°F 76°F1016.1 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi44 min SSW 9.9 G 11 74°F 71°F1014.5 hPa49°F
PCOC1 - 9415144 - Port Chicago, CA 38 mi44 min SW 8 G 12 75°F 71°F1014.2 hPa
46214 - Point Reyes, CA (029) 44 mi44 min 60°F7 ft
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 45 mi44 min W 8 G 19 80°F 1013.5 hPa
SFXC1 - San Francisco Bay Reserve, CA 45 mi89 min W 12 78°F 1013 hPa52°F
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 46 mi34 min WSW 3.9 G 7.8 1016.3 hPa

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA20 mi78 minW 1410.00 miA Few Clouds65°F57°F76%1015.4 hPa
Half Moon Bay Airport, CA21 mi74 minN 06.00 miFog/Mist59°F59°F100%1016.9 hPa
Oakland, Metro Oakland International Airport, CA24 mi81 minWNW 1410.00 miA Few Clouds66°F59°F78%1015.7 hPa

Wind History from SFO (wind in knots)
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Last 24hrNW11NW11NW12NW10NW8NW7NW7NW7W5NW4NW3CalmNE5N7N8N7NW13NW16W18W21W21W19W14W16
1 day agoW12W9NW8NW6W6W6W7W6W5CalmW4CalmNE6N7NE8N8N8N8CalmS8S145NW11NW13
2 days agoNW11NW9NW10W8NW8W8W6W5W4W4S3CalmNE3NE5N7N9N9NW16NW16NW15NW16
G22
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Tide / Current Tables for San Francisco Bar, California
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San Francisco Bar
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Sat -- 01:20 AM PDT     0.90 feet Low Tide
Sat -- 01:39 AM PDT     Moonset
Sat -- 06:05 AM PDT     Sunrise
Sat -- 07:44 AM PDT     3.80 feet High Tide
Sat -- 12:43 PM PDT     2.06 feet Low Tide
Sat -- 03:28 PM PDT     Moonrise
Sat -- 07:21 PM PDT     5.84 feet High Tide
Sat -- 08:28 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.30.911.422.73.33.73.83.53.12.52.12.12.433.84.75.45.85.75.14.12.9

Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
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South Channel
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Sat -- 01:39 AM PDT     Moonset
Sat -- 02:29 AM PDT     0.01 knots Slack
Sat -- 05:35 AM PDT     0.99 knots Max Flood
Sat -- 06:04 AM PDT     Sunrise
Sat -- 08:45 AM PDT     -0.00 knots Slack
Sat -- 11:03 AM PDT     -0.74 knots Max Ebb
Sat -- 02:15 PM PDT     0.00 knots Slack
Sat -- 03:27 PM PDT     Moonrise
Sat -- 05:19 PM PDT     0.96 knots Max Flood
Sat -- 08:27 PM PDT     Sunset
Sat -- 08:32 PM PDT     -0.01 knots Slack
Sat -- 11:45 PM PDT     -1.42 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.2-0.9-0.30.30.7110.80.4-0.1-0.6-0.7-0.7-0.5-0.10.40.810.90.70.3-0.3-1-1.4

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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Wind Forecast for San Francisco/Monterey Bay Area, CA (23,6,7,8)
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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.