Saturday, June23, 2018 L-36.com


Marine Weather and Tides
San Jose, 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 5:45AMSunset 8:33PM Friday June 22, 2018 9:04 PM PDT (04:04 UTC) Moonrise 2:31PMMoonset 1:29AM Illumination 73% Phase: Waxing Gibbous; Moon at 10 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- 854 Pm Pdt Fri Jun 22 2018
Tonight..SW winds 10 to 20 kt...becoming nw up to 10 kt after midnight. Wind waves 3 to 4 ft this evening...becoming 2 ft or less. NW swell 3 to 4 ft at 8 seconds.
Sat..W winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. NW swell around 3 ft at 10 seconds. Patchy fog.
Sat night..SW winds 5 to 15 kt. Wind waves around 3 ft. NW swell around 3 ft at 10 seconds.
Sun..W winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. Light swells. Patchy fog.
Sun night..W winds 5 to 15 kt. Wind waves around 3 ft. Light swells. Patchy fog.
Mon..W winds up to 10 kt. Wind waves 2 ft or less. Light swells. Patchy fog.
Mon night..W winds 5 to 10 kt. Wind waves 2 ft or less. Light swells.
Tue..W winds up to 10 kt. Wind waves 2 ft or less. NW swell around 3 ft.
Wed..W winds up to 10 kt. Wind waves 2 ft or less. W swell 3 to 4 ft.
PZZ500 854 Pm Pdt Fri Jun 22 2018
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 and a thermal trough over the california interior will maintain gusty northerly winds over the coastal waters tonight into Saturday. Northerly winds decrease over the weekend over much of the coastal waters as a coastally trapped southerly wind reversal develops over the inner coastal waters reaching the golden gate and point reyes by either late Saturday or early Sunday morning.

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 230335
afdmtr
area forecast discussion
national weather service san francisco bay area
835 pm pdt Fri jun 22 2018

Synopsis A robust warming trend is forecast through Saturday
afternoon as high pressure builds over the region. This will lead to
hot conditions on Saturday with moderate to locally high heat risks
across mainly the interior. Additionally, offshore winds will
develop and result in heightened fire weather concerns to portions
of the region on Saturday and through much of Sunday. Cooling is
then expected on Sunday with increased onshore flow.

Discussion As of 8:35 pm pdt Friday... The marine layer remains
at around 1,000 feet per the fort ord profiler and satellite
imagery is showing clear skies across the region. Afternoon high
temperatures were on average 10 to 15 degrees warmer than
yesterday with widespread highs in the 90s and some locations
exceeding 100 f. Temperatures this evening are in the 60s and 70s
along the coast while many inland areas are still in the 80s.

Overnight lows will be relatively warm for higher elevations with
temperatures in the 60s and 70s while locations elsewhere will be
in the 50s.

No major changes to the forecast were made this evening. A
building upper level ridge will be responsible for further warming
across the region tomorrow. Widespread afternoon highs in the 90s
and lower 100s are expected. A heat advisory remains in effect
from 11 am to 8 pm tomorrow, valid for the north bay, east bay,
south bay, interior monterey county, and much of san benito
county. Heat risks will be moderate to locally high for locations
under the advisory. Residents are advised to limit outdoor
activities during the hottest time of day, stay in air-conditioned
areas, keep an eye on pets and livestock, and drink plenty of
fluids. Never leave kids or pets in a vehicle unattended for any
reason for any length of time, especially tomorrow, as
temperatures will rapidly reach dangerous levels inside of
vehicles. Highs along the immediate coast will range from the mid
60s to low 80s. Should anyone head to the coast to escape the
heat, please obey all local beach signs and use caution as rip
currents are always a present hazard and sea surface temperatures
remain in the 50s and low 60s.

In addition to a heat advisory, a red flag warning remains in
effect from 11 am tomorrow through 8 pm Sunday. Hot temperatures
along with dry breezy offshore winds will cause any fires that
develop to spread rapidly. Daytime minimum relative humidity
values are expected around 10 to 20 percent with some locations
even dropping to single digits. Northerly winds of 15 to 30 mph
and gusts to 40 mph are forecast for the warned areas. Overnight
humidity recoveries will be poor and likely less than 30 percent.

Cooling will begin on Sunday as the upper ridge shifts inland and
an upper low approaches the pacific northwest. Additionally, models
are continuing to suggest the development of a southerly surge
along the big sur coast Sunday morning before spreading northward
through the afternoon and evening. Most of the cooling due to the
surge will be felt along the coast where temperatures are
expected to be around 5 to 10 degrees cooler than on Saturday.

Increased onshore flow will also cool inland areas by about 10 to
15 degrees. Highs are expected in the 80s and 90s for the interior
with coastal areas in the 60s and 70s. As the upper low
approaches, a cooling trend will continue into the coming work
week. By Monday, temperatures will be much closer to seasonal
normals as a more established marine layer returns.

Aviation As of 5:04 pm pdt Friday... High confidenceVFR for
the period. N-ne winds enhanced tonight into Saturday morning by
increasing acv-sfo and wmc-sfo pressure gradients. Low level wind
shear develops from napa county southward over the east bay and
into the south bay early Saturday morning, wind flow aloft ne
20-30 knots based on recent WRF model output. NAM continues with
approx 5 mb onshore bias sfo-wmc thus corrected for this we could
have 10-14 mb offshore wmc-sfo pressure gradient Saturday night
into Sunday morning.

Vicinity of ksfo...VFR, westerly wind 20-30 knots this evening til
04z before subsiding steadily mid-late evening. Surface wind likely
becoming light NE by early Saturday morning, returning to onshore
with gusts up to near 20 knots Saturday afternoon and early evening.

Sfo bridge approach...VFR.

Monterey bay terminals...VFR, onshore winds becoming light e-se later
this evening and overnight. Onshore winds likely redeveloping by late
Saturday morning.

Fire weather As of 8:35 pm pdt Friday... A red flag warning
remains in effect for the north and east bay hills from 11 am
tomorrow through 8 pm Sunday evening. The main concern will be for
hot inland temperatures and low relative humidity along with
moderate and dry northerly winds. To be clear the weather set-up
is very different and not nearly as critical in terms of winds to
the north bay firestorm last october.

Temperatures will continue to rise tomorrow further drying out
fuels that are running near average in terms of seasonal dryness.

Even more widespread afternoon highs in the 90s and low 100s are
expected tomorrow. As temperatures warm, dry northerly winds will
come down the sacramento valley and spread over napa county
tomorrow morning. Wind gusts are forecast between 35-45 mph. Winds
will ease in the afternoon before the north and east bay hills see
another round of increased north winds. During this time little to
no relative humidity recovery is expected and overnight lows will
be warm in the 70s and 80s. Afternoon highs on Sunday will remain
warm to hot, but onshore flow will return late in the day
providing some cooling.

Those spending time outside this weekend are urged to be vigilant
with sources of ignition. Any new fire starts, especially in the
grassy fuels will spread rapidly.

Marine As of 4:53 pm pdt Friday... Strong high pressure over
the eastern pacific will maintain moderate to strong northerly
winds across the coastal waters through late Saturday night. The
strongest winds will be located over the northern outer waters.

These sustained strong winds will produce relatively large and
steep winds waves on top of a building northwesterly swell with
moderate periods. Winds will decrease Sunday as a southerly surge
moves up the coast, but remain breezy along the inner coastal
waters.

Mtr watches warnings advisories
Tngt Sca... Pigeon pt to pt pinos 0-10 nm until 9 pm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
public forecast: as
aviation: canepa
marine: sims
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 29 mi47 min 71°F
ELXC1 - Elkhorn Slough Reserve, CA 31 mi80 min SSW 8 59°F 1011 hPa53°F
46092 - MBM1 38 mi61 min NW 18 56°F 54°F1009.7 hPa (-1.1)
46240 - Cabrillo Point, Monterey Bay, CA (158) 44 mi44 min 58°F3 ft
AAMC1 - 9414750 - Alameda, CA 45 mi59 min W 7 G 9.9 63°F 66°F1009.8 hPa
MEYC1 46 mi89 min SW 5.1 G 9.9 59°F 58°F1011.4 hPa
LNDC1 46 mi47 min WSW 5.1 G 7 65°F 1009.4 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA 46 mi75 min NW 21 G 25 57°F 53°F8 ft1009.8 hPa (-1.3)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 47 mi53 min W 5.1 G 5.1
OBXC1 48 mi53 min 63°F 53°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 48 mi47 min NW 5.1 G 7 62°F 1009.5 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 49 mi53 min NW 2.9 G 4.1 65°F 1008.6 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Jose / Reid / Hillv, CA6 mi78 minWNW 1010.00 miClear84°F50°F31%1008.8 hPa
San Jose, San Jose International Airport, CA11 mi72 minW 910.00 miFair79°F52°F39%1009.4 hPa
Mountain View, Moffett Field, CA19 mi69 minN 810.00 miFair71°F57°F61%1010 hPa
Watsonville, Watsonville Municipal Airport, CA22 mi72 minSSE 77.00 miFair61°F53°F75%1010.5 hPa
Palo Alto Airport, CA24 mi78 minNNW 810.00 miClear70°F59°F69%1009.5 hPa

Wind History from RHV (wind in knots)
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Last 24hrNW7------------------NW456----NW5W8NW10NW10NW10NW10NW10NW10NW6
1 day ago----------------------5NW10NW6NW10NW10NW10NW8NW8--N11----NW8
2 days agoNW8----------------N64W7--NW10NW10NW10NW10NW10NW14----------

Tide / Current Tables for Gold Street Bridge, Alviso Slough, San Francisco Bay, California
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Gold Street Bridge
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Sat -- 03:01 AM PDT     Moonset
Sat -- 05:35 AM PDT     0.41 feet Low Tide
Sat -- 05:47 AM PDT     Sunrise
Sat -- 10:46 AM PDT     6.78 feet High Tide
Sat -- 04:31 PM PDT     Moonrise
Sat -- 04:58 PM PDT     1.67 feet Low Tide
Sat -- 08:32 PM PDT     Sunset
Sat -- 10:21 PM PDT     10.23 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
8.16.34.32.51.20.50.51.53.256.46.86.35.34.12.821.72.44.26.58.810.110.1

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
Click for Map
Sat -- 02:40 AM PDT     -1.13 knots Max Ebb
Sat -- 03:01 AM PDT     Moonset
Sat -- 05:15 AM PDT     0.01 knots Slack
Sat -- 05:48 AM PDT     Sunrise
Sat -- 08:04 AM PDT     1.20 knots Max Flood
Sat -- 10:54 AM PDT     -0.01 knots Slack
Sat -- 03:03 PM PDT     -0.67 knots Max Ebb
Sat -- 04:32 PM PDT     Moonrise
Sat -- 05:03 PM PDT     0.00 knots Slack
Sat -- 07:50 PM PDT     1.15 knots Max Flood
Sat -- 08:32 PM PDT     Sunset
Sat -- 10:38 PM PDT     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.8-1-1.1-1.1-0.9-0.20.511.21.10.6-0-0.3-0.5-0.6-0.7-0.6-00.611.110.5-0.2

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 (0,6,7,8)
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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.