Tuesday, May21, 2019 L-36.com


Marine Weather and Tides
San Jose, 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 5:52AMSunset 8:14PM Monday May 20, 2019 11:58 PM PDT (06:58 UTC) Moonrise 9:18PMMoonset 6:27AM Illumination 95% Phase: Waning Gibbous; Moon at 17 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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PZZ535 Monterey Bay- 910 Pm Pdt Mon May 20 2019
.small craft advisory in effect until 9 pm pdt this evening...
Tonight..W winds 10 to 20 kt with gusts up to 25 kt. Wind waves 4 to 5 ft. W swell 5 to 7 ft at 11 seconds. Rain.
Tue..W winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 5 ft. W swell 5 to 7 ft at 12 seconds. Rain likely.
Tue night..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 5 to 6 ft. W swell 8 to 10 ft at 14 seconds. A chance of rain.
Wed..W winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 5 ft. W swell 8 to 10 ft at 13 seconds.
Wed night..W winds 10 to 20 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. W swell 7 to 9 ft at 12 seconds.
Thu..S winds up to 10 kt. Wind waves 2 ft or less. W swell 7 to 9 ft at 11 seconds.
Thu night..SW winds up to 10 kt. Wind waves 2 ft or less. W swell 5 to 7 ft at 11 seconds.
Fri..SW winds up to 10 kt. Wind waves 2 ft or less. W swell 3 to 5 ft.
Sat..W winds up to 10 kt. Wind waves 2 ft or less. W swell 2 to 4 ft. Locally lower winds and seas across sheltered portions of the bay.
PZZ500 910 Pm Pdt Mon May 20 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A low pressure system will move south along the coastline tonight and Tuesday bringing scattered showers to the coastal waters. Winds will increase Tuesday and Wednesday behind the low with gale force gusts possibly Wednesday. Seas will build on Tuesday then continue through most of the week.


7 Day Forecast for Marine Location Near San Jose, CA
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location: 37.26, -121.78     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 210536
afdmtr
area forecast discussion
national weather service san francisco bay area
1036 pm pdt Mon may 20 2019

Synopsis Light rain will develop late this evening over the
north bay and then across the remainder of the region overnight.

Showers will linger into Tuesday before the return of dry
conditions Tuesday night into Wednesday. Cool and unsettled
conditions are likely through the remainder of the week, yet
widspread rainfall appears less likely.

Discussion As of 9:19 pm pdt Monday... Kmux radar is beginning
to show some weak echos develop in the far north bay as the next
system starts to impact the region. No reports of measurable rain
in sonoma or napa counties at this time; however, that will likely
start to change within the next hour. As the overnight hours
progress, we will see more light rain develop along the frontal
boundary with rain chances increasing from north to south. Based
off current radar and surface observation trends, have made a
minor forecast update to the probability of precipitation and wx
grids this evening to adjust the onset of the light rain back by a
few hours. After the main band of rain pushes through overnight
and into early morning hours, some scattered post-frontal
convective rain showers seem quite probable through Tuesday
afternoon. For additional details beyond the next 24 hours, please
refer to the previous discussion section.

Prev discussion As of 01:45 pm pdt Monday... The storm system that
brought convection to the bay area yesterday continues to pivot
eastward through the desert southwest this afternoon. In its wake
a cold airmass has settled across the bay area. The colder air and
daytime heating has allowed for widespread fair weather cumulus
clouds this afternoon. The oakland sounding did have a 30 j kg of
fcst CAPE - enough to just bubble up a few clouds. Temperatures
across the region are also running cool today with highs likely
maxing out in the upper 50s to mid 60s - highest peaks above 4000
feet will stay in the 40s.

Looking upstream the next weather system is already making its
presence known. High clouds are beginning to stream into norcal
with a more linear cloud deck off the norcal coast. A cold front is
forecast to move inland this evening and gradually over the bay
area tonight. Latest hi-res models have been pretty consistent
with timing of precip - light rain developing across the north bay
late this evening and gradually spreading south through the
remainder of the forecast area early Tuesday. A few lingering
showers will be possible behind the front during the afternoon. A
very low end chance, but enough instability may be present in the
post frontal regime with the upper low to generate a few
thunderstorms eastern napa and the east bay Tuesday afternoon.

Chances are more likely in the central valley, but did want to at
least mention it. Rainfall amounts will be much less than the last
system - generally a few hundredths to a quarter.

The upper low drifts east by Wednesday taking precip chances with
it. The longwave pattern still shows a broad upper trough pretty
much locked over the region. Despite the dry weather on Wednesday
and Thursday temperatures will remain on the cool. Will say there
is some uncertainty regarding precip by Thursday night into Friday
as an another upper low retrogrades around the broad upper
trough. The bay area is on the drier side of the upper low, but a
few light showers may drift into the eastern portion of the cwa.

Precip chances increase over the weekend as a more pronounced
upper low rounds the base of the trough. Definitely an unusual
pattern for later may. Medium to longer range models keep the
trough over the region well through the end of may.

Aviation As of 10:35 pm pdt Monday... Radar shows the showers
moving into the sfo bay area from the northwest. Showers will
spread rapidly south as this is a quick moving system. Expect cigs
in the 2500-3500 foot range through tonight possibly rising
slightly on Tuesday. After the front moves through there may be a
letup in shower activity Tuesday morning but afternoon instability
will allow showers to pop up in the afternoon. Winds will increase
after 15z behind the front. Models indicating 20-25 kt at sfo and
oak so there could be gusts up to 30 kt.

Vicinity of ksfo... Becoming MVFR CIGS with bases 2500-3500 feet.

Scattered showers mainly overnight and again Tuesday afternoon.

West to southwest winds to 15 kt increasing to 20-25 kt after
18z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Scattered cumulus clouds this afternoon
becoming bkn MVFR CIGS after 08z with light showers. Therer may be
a letup in shower activity after 13z but should pick up again in
the afternoon due to instability heating. West winds increasing to
15 kt gusting to 20 kt Tuesday afternoon.

Marine As of 10:25 pm pdt Monday... A low pressure system will
move south along the coastline tonight and Tuesday bringing
scattered showers to the coastal waters. Winds will increase
Tuesday and Wednesday behind the low with gale force gusts
possibly Wednesday. Seas will build on Tuesday then continue
through most of the week.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm
sca... Pigeon pt to pt pinos 0-10 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
public forecast: rowe mm
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 29 mi64 min SSE 5.1 G 7 57°F 63°F1015.6 hPa
ELXC1 - Elkhorn Slough Reserve, CA 31 mi73 min WSW 2.9 54°F 1017 hPa51°F
MLSC1 - Moss Landing, South Harbor, CA 32 mi126 min W 5.1 G 15 56°F 1017.8 hPa51°F
46092 - MBM1 38 mi45 min SW 9.7 56°F 58°F1016.2 hPa (+0.0)
46240 - Cabrillo Point, Monterey Bay, CA (158) 44 mi58 min 58°F4 ft
AAMC1 - 9414750 - Alameda, CA 45 mi64 min SSW 11 G 13 56°F 62°F1015.6 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA 46 mi68 min WSW 7.8 G 9.7 56°F 57°F8 ft1016.1 hPa (+0.0)
LNDC1 46 mi58 min SW 9.9 G 13 57°F 1015.1 hPa (-0.5)
MEYC1 46 mi82 min 59°F1016.9 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 47 mi64 min SSW 9.9 G 14
46114 - West Monterey Bay, CA 48 mi58 min 58°F7 ft
OBXC1 48 mi58 min 57°F 50°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 48 mi58 min SW 8.9 G 13 57°F 1015.2 hPa (-0.4)
PXOC1 - 9414311 - San Francisco (Pier 1), CA 49 mi58 min NNE 1.9 G 5.1 56°F 1014.1 hPa (-0.4)

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Jose / Reid / Hillv, CA6 mi4 hrsNW 910.00 miPartly Cloudy59°F44°F59%1016.3 hPa
San Jose, San Jose International Airport, CA11 mi65 minVar 310.00 miPartly Cloudy56°F48°F75%1015.3 hPa
Mountain View, Moffett Field, CA19 mi62 minN 010.00 miMostly Cloudy57°F46°F67%1015.8 hPa
Watsonville, Watsonville Municipal Airport, CA22 mi65 minNNW 310.00 miFair52°F48°F89%1016.4 hPa
Palo Alto Airport, CA24 mi3.2 hrsVar 510.00 miMostly Cloudy55°F46°F72%1016.3 hPa

Wind History from RHV (wind in knots)
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Last 24hrCalmCalm----------------CalmCalmCalmCalmN4N8NW8NW8
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1 day agoS10S10----------------SE5SW6CalmSE6E45----------NW844
2 days agoNW8NW4----------------SE5S6SW6CalmSE11SE9--W3SE8SE8SE8SE12SE12SE14
G22

Tide / Current Tables for Gold Street Bridge, Alviso Slough, San Francisco Bay, California
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Gold Street Bridge
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Tue -- 02:21 AM PDT     9.83 feet High Tide
Tue -- 05:54 AM PDT     Sunrise
Tue -- 08:16 AM PDT     Moonset
Tue -- 10:28 AM PDT     -1.14 feet Low Tide
Tue -- 04:35 PM PDT     7.57 feet High Tide
Tue -- 08:15 PM PDT     Sunset
Tue -- 10:26 PM PDT     2.96 feet Low Tide
Tue -- 11:14 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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6.18.39.79.78.97.45.33.11.1-0.3-1.1-0.90.32.24.36.27.47.56.95.84.63.633.2

Tide / Current Tables for Dumbarton Point 2.3 mi NE, South San Francisco Bay, California Current
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Dumbarton Point 2.3 mi NE
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Tue -- 02:38 AM PDT     -0.01 knots Slack
Tue -- 05:54 AM PDT     Sunrise
Tue -- 07:25 AM PDT     -1.49 knots Max Ebb
Tue -- 08:16 AM PDT     Moonset
Tue -- 10:12 AM PDT     0.01 knots Slack
Tue -- 12:59 PM PDT     1.50 knots Max Flood
Tue -- 04:29 PM PDT     -0.00 knots Slack
Tue -- 08:03 PM PDT     -0.65 knots Max Ebb
Tue -- 08:15 PM PDT     Sunset
Tue -- 10:07 PM PDT     0.00 knots Slack
Tue -- 11:14 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.10.90.4-0.1-0.6-1-1.3-1.5-1.4-0.9-0.20.71.31.51.410.3-0.2-0.4-0.6-0.6-0.5-0.10.4

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 (2,6,7,8)
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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.