Thursday, July19, 2018 L-36.com


Marine Weather and Tides
Belmont, 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 6:01AMSunset 8:29PM Wednesday July 18, 2018 10:57 PM PDT (05:57 UTC) Moonrise 11:24AMMoonset 11:33PM Illumination 37% 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- 855 Pm Pdt Wed Jul 18 2018
Tonight..NW winds 5 to 15 kt- diminishing to up to 10 kt after midnight.
Thu..NW winds 10 to 20 kt with gusts up to 25 kt.
Thu night..NW winds 5 to 15 kt. A slight chance of showers and Thunderstorms.
Fri..NW winds 10 to 20 kt with gusts up to 25 kt. A slight chance of showers and Thunderstorms.
Fri night..NW winds 10 to 20 kt with gusts up to 25 kt. A slight chance of showers and Thunderstorms.
Sat..NW winds 10 to 20 kt with gusts up to 25 kt.
Sat night..W winds 10 to 20 kt with gusts up to 25 kt.
Sun..W winds 5 to 15 kt.
Mon..W winds 5 to 15 kt. Winds and wind waves higher in and near Thunderstorms.
PZZ500 855 Pm Pdt Wed Jul 18 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure off the pacific northwest and thermal low pressure over the california interior will keep stronger winds over the northern outer waters and light winds elsewhere. 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.

7 Day Forecast for Marine Location Near Belmont, CA
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location: 37.52, -122.28     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 190538
afdmtr
area forecast discussion
national weather service san francisco bay area
1038 pm pdt Wed jul 18 2018

Synopsis Seasonably warm temperatures will persist region-wide
through the forecast period with marine air keeping conditions
cooler at the coast. Monsoon moisture will spread over the region
and provide a slight chance of high-based convection on Thursday and
Friday along with an increase in cloud cover. Drier conditions then
return by the upcoming weekend.

Discussion As of 09:21 pm pdt Wednesday... Coastal profilers at
bodega bay and fort ord continue to show a uniform marine layer
holding steady all day around 1300-1500 feet. This will likely
cause some localized mist along the immediate coast tonight.

Otherwise, simply coastal fog and low clouds. Temps across the
interior are coming down nicely with observations showing
widespread 60s. Some pockets are cooler and some warmer, but
overall a nice trend toward the overnight lows generally in the
50s. Hills and mountains will remain warmer due to the thermal
inversion. Outside of a forecast that is on track for the evening,
focus remains on the threat of convection over the bay area.

Monsoonal moisture remains on track with water vapor and infrared
satellite imagery showing the moisture plume migrating in from the
south. Doppler radars from our hanford and la offices are picking
up showers in kern and slo counties drifting north as the showers
propagate from east to west. Over the next few hours we should
begin to see some virga over southern monterey county. 00z model
runs continue to show plenty of moisture coming in above about 700
mb with mixed thoughts on instability. The NAM is showing pockets
of 1000+ j kg of CAPE while the local mtr WRF is only showing a
few hundred at best. This gives us a continued non-zero chance of
squeezing out a high based thunderstorm or two over the next few
days. While it doesn't look widespread, it does seem as though a
pop up cell or two are likely between early Thursday morning and
Friday afternoon. There is no reason to remove thunderstorms from
the forecast at this time, so we will continue to leave the slight
chance in the forecast. Beyond this week, look for another warm
up next week. More to come. Have a great night.

Prev discussion As of 01:51 pm pdt Wednesday... Temperatures are
once again very warm to hot across the interior and in the higher
elevations across the region this afternoon. This is a result of
500 mb heights of 598 dam centered over the region as high clouds
increase from the south southeast. Meanwhile, cooler conditions
persist closer to the coast with weak onshore flow and the
presence of a 1,200-1,500 foot marine layer.

While the ridge aloft will maintain seasonably warm conditions
through the forecast period, all attention turns to the increase of
monsoon moisture from the south southeast in the coming days. The
latest thinking is that moisture advection will continue in the 700-
500 mb layer and even above from late tonight into Friday. The nam
is most bullish with MUCAPE increasing as well into the 200-600
j kg range over the central coast on Thursday and then spreading
northward into Thursday night. Another surge of moisture and
instability will be possible on Friday as a vort MAX rotates around
the east side of a mid upper level low well offshore. In addition,
pwat values are forecast to exceed 1.25" over much of our region
Thursday into Friday which is 2-4 standard deviations above
climatology. While this is not a slam dunk, do feel the potential
remains for high-based convection Thursday into Thursday night with
even a sprinkle or light shower reaching the surface on Friday as
moisture depth increases aloft. Thus, have added a slight chance of
thunderstorms back into the forecast from Thursday afternoon over
the southern portions of the region shifting northward Thursday
night into Friday afternoon.

The increase mid high level cloud cover associated with the
aforementioned moisture will also help to cool temperatures inland
by a bit through late week. However, still looking for 60s to 70s at
the coast with widespread 80s to 90s inland. In addition, conditions
will feel more humid muggy Thursday into Friday. Upper level cloud
cover typically disrupts the marine layer some as well, yet do
expect low clouds to persist near the coast in the coming days.

Drier southwest flow aloft is then forecast to develop by the
upcoming weekend which should end chances for high-based
convection over the region. Higher pressure will also continue to
dominate the pattern with temperatures at or above seasonal
averages (warmest across the interior) heading into early next
week. Do expect marine air to keep conditions cooler at the coast
with night morning low clouds in the extended as well.

Aviation As of 10:30 pm pdt Wednesday... Shallow marine layer
with moderate onshore flow. Stratus spreading across the golden
gate into oak. Clouds will then circle around to the south bay
and finally into sfo after 10z. Mid and high clouds will spread
over the area from the SE tonight and Thursday with the possibility
of a thunderstorm Thursday afternoon and evening south of the sfo
bay area.

Vicinity of ksfo... MVFR ifr after 10z. Confidence is not high as
some models show a hole around sfo with CIGS on the edges.

Sfo bridge approach... Similar to sfo.

Monterey bay terminals... Ifr through 17z at sns and 18z at mry.

Marine As of 10:34 pm pdt Wednesday... High pressure off the
pacific northwest and thermal low pressure over the california
interior will keep stronger winds over the northern outer waters
and light winds elsewhere. 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: bfg rgass
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
RTYC1 - 9414523 - Redwood City, CA 4 mi40 min NNW 5.1 G 6 63°F 74°F1014.7 hPa
AAMC1 - 9414750 - Alameda, CA 17 mi46 min WNW 6 G 8.9 59°F 70°F1014.7 hPa
LNDC1 19 mi40 min WNW 4.1 G 6 60°F 1014.4 hPa
OBXC1 20 mi40 min 58°F 58°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 20 mi40 min WSW 5.1 G 11 56°F 1013.5 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 20 mi46 min W 7 G 8.9
OKXC1 - 9414776 - Oakland (Berth 34), CA 20 mi40 min W 5.1 G 8 58°F 1014.5 hPa
PXSC1 21 mi46 min 57°F 57°F
FTPC1 - 9414290 - San Francisco, CA 22 mi46 min SSW 4.1 G 7 55°F 61°F1014.7 hPa
46237 - San Francisco Bar, CA (142) 26 mi58 min 57°F3 ft
PPXC1 - 9414847 - Richmond (Point Potrero), CA 27 mi40 min S 17 G 19 57°F 1014.3 hPa
RCMC1 - 9414863 - Richmond, CA 29 mi46 min S 4.1 G 8 58°F 66°F1013.8 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 34 mi68 min W 3.9 G 7.8 56°F 61°F6 ft1015.2 hPa (+0.0)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 34 mi38 min W 3.9 G 7.8 55°F 60°F1015.3 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 37 mi40 min WSW 17 G 19 59°F 1012.7 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 37 mi40 min NW 9.9 G 12 64°F 70°F1012.7 hPa61°F
PCOC1 - 9415144 - Port Chicago, CA 39 mi40 min W 14 G 18 67°F 70°F1012.2 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 42 mi40 min NW 12 G 16 73°F 1010.9 hPa
SFXC1 - San Francisco Bay Reserve, CA 49 mi73 min W 12 67°F 1011 hPa55°F
PRYC1 - 9415020 - Point Reyes, CA 49 mi40 min WNW 1.9 G 5.1 58°F1014.3 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Carlos Airport, CA2 mi63 minN 310.00 miFair63°F57°F83%1013.9 hPa
San Francisco, San Francisco International Airport, CA8 mi62 minWNW 910.00 miA Few Clouds59°F55°F87%1013.8 hPa
Palo Alto Airport, CA9 mi2.2 hrsNW 710.00 miPartly Cloudy64°F59°F83%1013.9 hPa
Half Moon Bay Airport, CA12 mi63 minSE 56.00 miFog/Mist57°F55°F94%1015.2 hPa
Hayward, Hayward Air Terminal, CA13 mi64 minWNW 610.00 miFair61°F54°F78%1014.8 hPa
Oakland, Metro Oakland International Airport, CA13 mi65 minNW 810.00 miA Few Clouds58°F57°F97%1014.1 hPa
Mountain View, Moffett Field, CA14 mi62 minW 310.00 miFair63°F60°F90%1014.4 hPa
San Jose, San Jose International Airport, CA21 mi65 minNW 610.00 miA Few Clouds67°F59°F76%1013.9 hPa

Wind History from SQL (wind in knots)
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Last 24hrNW4N4N4CalmN3CalmS3CalmCalm434N7N8N9N9N11N9N9NW8N6N5N4N4
1 day agoNW5NW3NW5NW5NW3NW3NW3CalmNW44CalmN6N7N9N10N12N9NW8N7N6N7NW5N6N4
2 days agoCalmNW3NW3NW3NW6NW3W4S5SE633N6N7N6N9N11N14N10N9NW7NW8NW8NW7NW5

Tide / Current Tables for Smith Slough, San Francisco Bay, California
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Smith Slough
Click for Map
Thu -- 12:33 AM PDT     Moonset
Thu -- 01:29 AM PDT     1.65 feet Low Tide
Thu -- 06:02 AM PDT     Sunrise
Thu -- 06:39 AM PDT     6.61 feet High Tide
Thu -- 12:53 PM PDT     First Quarter
Thu -- 01:16 PM PDT     0.93 feet Low Tide
Thu -- 01:26 PM PDT     Moonrise
Thu -- 07:34 PM PDT     8.02 feet High Tide
Thu -- 08:27 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.31.71.82.645.46.46.66.15.13.72.41.411.22.13.65.36.97.987.36.14.7

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
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San Mateo Bridge
Click for Map
Thu -- 12:33 AM PDT     Moonset
Thu -- 01:34 AM PDT     0.00 knots Slack
Thu -- 04:06 AM PDT     1.20 knots Max Flood
Thu -- 06:02 AM PDT     Sunrise
Thu -- 07:19 AM PDT     -0.00 knots Slack
Thu -- 10:21 AM PDT     -1.19 knots Max Ebb
Thu -- 12:53 PM PDT     First Quarter
Thu -- 01:26 PM PDT     Moonrise
Thu -- 01:36 PM PDT     0.01 knots Slack
Thu -- 04:28 PM PDT     1.48 knots Max Flood
Thu -- 07:56 PM PDT     -0.00 knots Slack
Thu -- 08:27 PM PDT     Sunset
Thu -- 11:08 PM PDT     -1.31 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.9-0.40.311.21.10.80.2-0.4-0.9-1.2-1.1-0.8-0.40.311.41.41.20.7-0-0.7-1.1-1.3

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 (1,6,7,8)
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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.