Tuesday, October16, 2018 L-36.com


Marine Weather and Tides
Belmont, CA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:17AMSunset 6:30PM Tuesday October 16, 2018 12:15 PM PDT (19:15 UTC) Moonrise 1:23PMMoonset 11:29PM Illumination 47% 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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PZZ531 San Francisco Bay South Of The Bay Bridge- 849 Am Pdt Tue Oct 16 2018
Today..NW winds 5 kt...becoming W 5 to 15 kt in the afternoon.
Tonight..W winds 5 to 15 kt.
Wed..NW winds 10 kt.
Wed night..W winds 5 to 15 kt.
Thu..W winds 5 to 15 kt.
Fri..E winds 5 kt...becoming w.
Sat..W winds 10 kt.
PZZ500 849 Am Pdt Tue Oct 16 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Generally light to locally moderate northwesterly winds will prevail across the coastal waters through the coming days. Mixed swell will continue with a long period southerly swell through mid week and a more moderate period northwest swell. A longer period northwest swell will arrive during the second half of the 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 161747
afdmtr
area forecast discussion
national weather service san francisco bay area
1047 am pdt Tue oct 16 2018

Synopsis Light offshore winds are forecast to persist through
midweek with temperatures near or above seasonal averages. Onshore
winds increase a bit late in the week which will help moisten
conditions while temperatures remain seasonably mild. A passing
storm system may bring rain to portions of california early next
week.

Discussion As of 09:19 am pdt Tuesday... Dry weather conditions
prevail over the region this morning with chilly temperatures to
start the morning. Many locations, especially over the northern
half of the region are a few to several degrees cooler compared
to 24 hours ago. While mainly clear skies prevail today, should
see temperatures a few degrees cooler compared to yesterday
afternoon given the weaker offshore flow. However, a warm and very
dry air mass remains in place over the entire region which may
allow for some coastal areas to warm a bit above the current
forecast maximum temperatures. With this said, the ongoing
forecast appears on track and no updates are anticipated at this
time. For additional details, please see the forecast discussion
below.

Prev discussion As of 2:37 am pdt Tuesday... What a difference 24
hours makes. The latest pressure gradients still indicate offshore
flow across the region, but compare to 24 hours ago it is weaker.

The overnight sfo-wmc gradient is roughly 10mb, which is about
3-4mb weaker. The weaker offshore flow has translated to less
gusty winds across the region. That being said, stations in the
hills are still reporting some gusts of 20-30 mph and not 50-70
mph like last night. The weaker offshore flow has allowed for much
cooler temperatures across the interior valleys with readings in
the 40s. A few protected spots across the north bay may even drop
into the upper 30s. Relative humidity values are also much higher
than last night - santa rosa is 55% higher and napa is 47%
higher. Despite the improving conditions there are still fire
weather concerns. For specific details read the fire section
below.

Longwave pattern continues to show an upper low parked over socal
and az with high pressure nosing into the pacnw. The longwave
pattern will gradually shift as the upper low slowly lifts to the
ne through Thursday. Therefore, the bay area will hold onto the weak
offshore flow set up with seasonable temps along the coast
(60s 70s) and above normal temps inland (70s 80s). Overnight lows
will remain mild in the hills, but cooler temps in the valleys.

Given the dry airmass and decreasing winds the chances for
overnight lows dipping into the 30s will increase.

Overnight and early morning clouds will be a low confidence
forecast this week as weak offshore flow remains. Some of the
hi-res models indicate some patchy clouds along the coast and
locally inland.

By Friday and into the weekend a weak rex block becomes
established over the region keeping mild and dry conditions in
place. In fact, daytime temperatures will likely warm over the
weekend leading to pleasant fall weather around the region.

Possible pattern shift early next week as the blocking pattern
ends as an upper trough approaches from the nw. Medium range
models continue to show the approaching trough will likely bring
some precip to the ca, but how much is yet to be seen. Will keep
the current mention of precip early next week. One thing that is
more certain will be the cooldown.

Aviation As of 10:47 am pdt Tuesday... For 18z tafs. Clear
skies will prevail across area terminals today. Light winds will
increase slightly and turn onshore this afternoon. Winds will
diminish once again this evening becoming light and locally
variable overnight.

Vicinity of ksfo...VFR. Light winds will increase out of the west to
around 10 kt this afternoon. Winds will diminish once again this
evening becoming easterly overnight.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR. Generally light winds.

Fire weather As of 02:37 am pdt Tuesday... The expired red flag
warning is old news at this point, but fire weather concerns are
far from over. Winds have diminished over the region, but rh
values above 1k feet are still in the tank. Readings overnight
still show rh in the teens with mild temps. Winds are still gusty
at times with some locally gusty conditions of 20-30 mph. There
will be a few stations reaching red flag criteria through early
this morning, but not widespread enough to do a red flag warning.

Should see conditions moisten slightly late in the week as onshore
winds increase a bit. Overall, this should help limit fire weather
concerns region-wide. Will need to closely monitor these
conditions however as the ongoing dry, breezy windy conditions
have further dried fuels.

Marine As of 10:39 am pdt Tuesday... Generally light to locally
moderate northwesterly winds will prevail across the coastal
waters through the coming days. Mixed swell will continue with a
long period southerly swell through mid week and a more moderate
period northwest swell. A longer period northwest swell will
arrive during the second half of the week.

Mtr watches warnings advisories
Tday None.

Public forecast: rgass mm
aviation: cw
marine: cw dp
fire weather: mm
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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 mi28 min Calm G 1.9 67°F 67°F1019.9 hPa
AAMC1 - 9414750 - Alameda, CA 17 mi34 min S 1.9 G 2.9 63°F 64°F1019.7 hPa
LNDC1 19 mi28 min Calm G 1.9 65°F 1019.4 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 20 mi28 min WNW 5.1 G 5.1 62°F 1019.3 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 20 mi28 min ENE 1.9 G 2.9 61°F 1018.5 hPa
OBXC1 20 mi28 min 62°F 52°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 20 mi28 min SW 5.1 G 5.1
PXSC1 21 mi28 min 63°F 54°F
FTPC1 - 9414290 - San Francisco, CA 22 mi34 min WSW 6 G 11 58°F 61°F1019.8 hPa
46237 - San Francisco Bar, CA (142) 26 mi46 min 59°F3 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 27 mi35 min SE 8.9 64°F 1019 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 27 mi34 min SSW 6 G 8 62°F 1019.8 hPa
RCMC1 - 9414863 - Richmond, CA 29 mi28 min 63°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 34 mi16 min W 1.9 G 3.9 53°F 1020.3 hPa (+0.0)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 37 mi28 min W 1.9 G 4.1 61°F 1018.9 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 37 mi28 min W 7 G 8 66°F 65°F1018.9 hPa
PCOC1 - 9415144 - Port Chicago, CA 39 mi28 min W 2.9 G 5.1 71°F 64°F1018.7 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 42 mi28 min WNW 2.9 G 4.1 71°F 1018.7 hPa
PRYC1 - 9415020 - Point Reyes, CA 49 mi28 min S 2.9 G 5.1 59°F1019.5 hPa
SFXC1 - San Francisco Bay Reserve, CA 49 mi91 min WSW 1.9 69°F 1019 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Carlos Airport, CA2 mi21 minVar 310.00 miClear68°F50°F53%1019.3 hPa
San Francisco, San Francisco International Airport, CA8 mi20 minENE 410.00 miA Few Clouds65°F48°F54%1019 hPa
Palo Alto Airport, CA9 mi29 minNNE 610.00 miClear66°F44°F46%1019.6 hPa
Hayward, Hayward Air Terminal, CA13 mi22 minSW 410.00 miFair70°F39°F34%1020.2 hPa
Oakland, Metro Oakland International Airport, CA13 mi23 minSW 310.00 miFair65°F37°F37%1019.6 hPa
Mountain View, Moffett Field, CA14 mi20 minN 510.00 miFair73°F41°F32%1019.6 hPa
San Jose, San Jose International Airport, CA21 mi23 minVar 410.00 miFair73°F28°F19%1019 hPa

Wind History from SQL (wind in knots)
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Last 24hrCalmCalmCalmN5NW7W7NW7NW6N6NW4CalmCalmCalmCalmCalmCalmCalmCalmNW3CalmCalm3Calm3
1 day agoN5N6N5NW8NW7NW6NW6NW3W3CalmS3NW3NW7NW3NW6NW7NW5CalmS3S53S5SE5SE4
2 days agoN9NW9N8NW9W9NW6NW6NW7NW4CalmCalmCalmCalmCalmCalmCalmCalmS4S4CalmCalm33N4

Tide / Current Tables for Smith Slough, San Francisco Bay, California
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Smith Slough
Click for Map
Tue -- 01:29 AM PDT     0.60 feet Low Tide
Tue -- 07:18 AM PDT     Sunrise
Tue -- 08:35 AM PDT     6.58 feet High Tide
Tue -- 11:02 AM PDT     First Quarter
Tue -- 02:16 PM PDT     3.18 feet Low Tide
Tue -- 02:21 PM PDT     Moonrise
Tue -- 06:30 PM PDT     Sunset
Tue -- 06:49 PM PDT     6.88 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.10.70.71.32.43.64.95.96.56.56.15.24.33.63.23.44.35.56.56.96.65.84.73.4

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
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San Mateo Bridge
Click for Map
Tue -- 01:51 AM PDT     0.00 knots Slack
Tue -- 04:53 AM PDT     1.29 knots Max Flood
Tue -- 07:18 AM PDT     Sunrise
Tue -- 08:28 AM PDT     -0.00 knots Slack
Tue -- 10:54 AM PDT     -0.60 knots Max Ebb
Tue -- 11:02 AM PDT     First Quarter
Tue -- 02:16 PM PDT     0.00 knots Slack
Tue -- 02:22 PM PDT     Moonrise
Tue -- 04:32 PM PDT     0.69 knots Max Flood
Tue -- 06:30 PM PDT     Sunset
Tue -- 07:32 PM PDT     -0.00 knots Slack
Tue -- 11:02 PM PDT     -1.25 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.9-0.50.10.81.21.31.20.90.3-0.2-0.5-0.6-0.5-0.4-0.10.30.60.70.50.2-0.2-0.7-1.1-1.2

Weather Map and Satellite Images
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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 (15,3,4,5)
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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.