Monday, October23, 2017 L-36.com


Marine Weather and Tides
Cupertino, CA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 7:23AMSunset 6:20PM Monday October 23, 2017 4:35 AM PDT (11:35 UTC) Moonrise 9:54AMMoonset 8:15PM Illumination 11% Phase: Waxing Crescent; Moon at 3 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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PZZ560 Pigeon Point To Point Pinos To 10 Nm- 237 Am Pdt Mon Oct 23 2017
.small craft advisory in effect until 3 am pdt early this morning...
Today..N winds 10 kt. Wind waves 2 ft or less. NW swell 7 to 8 ft at 13 seconds.
Tonight..N winds 10 kt. Wind waves 2 ft or less. NW swell 7 to 8 ft at 18 seconds.
Tue..N winds 10 kt. Wind waves 2 ft or less. NW swell 7 to 8 ft at 16 seconds.
Tue night..N winds 10 kt. Wind waves 2 ft or less. NW swell 6 to 8 ft at 15 seconds.
Wed..NW winds 10 kt. Wind waves 2 ft or less. NW swell 4 to 6 ft at 14 seconds.
Thu..S winds 5 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft.
Fri..Light winds...becoming nw 10 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft.
PZZ500 237 Am Pdt Mon Oct 23 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Strong surface high pressure is building over the pacific northwest. This will push the thermal trough to the coast resulting in lighter winds through Friday. Northwest swell will decrease the next few days but another long-period swell is forecast by the end of the week.

7 Day Forecast for Marine Location Near Cupertino, CA
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location: 37.31, -122.06     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 230950
afdmtr
area forecast discussion
national weather service san francisco bay area
250 am pdt Mon oct 23 2017

Synopsis Rapid warming trend will occur today with record or
near record highs this afternoon and then again Tuesday afternoon.

Long october nights will allow for sufficient night time cooling
to avoid any heat headlines. Offshore flow may weaken slightly by
midweek but temperatures look to remain above normal through the
end of the week and perhaps even into the weekend. Long range
models keep dry weather in place through halloween.

Discussion As of 2:50 am pdt Monday... Skies are completely
clear across the bay area early this morning as offshore flow gets
firmly established. Northerly gradient down the coast is now 6 mb
with 8 mb offshore from the nevada deserts towards the coast.

This has kicked up some winds in the hills with mt diablo gusting
to around 59 mph out of the north. The 00z oakland sounding last
night showed the subsidence inversion around 3000 feet and it
appears that the strongest winds are staying at this level or
higher. The rose peak raws just above 3000 feet gusted to 43 mph
last hour. The hawkeye raws, which we often monitor closely during
offshore fire weather events has had temperatures warm into the
mid 70s with humidity down to 35% so far tonight as dry northeast
winds start to kick into place. So the stage is set for a sunny
and warm late oct day. Record highs for today are generally in the
upper 80s to mid 90s so a few records may fall today into
Tuesday. Right now Tuesday looks like it may be the hottest day
but offshore winds may be slightly weaker, reducing adiabatic
compression, however an overall warmer airmass may negate that
impact. Either way expect sunny and warm to hot afternoons the
next few days. As always we are concerned about our more heat
sensitive populations such as the elderly, young and homeless
populations. The long october nights and dry airmass will allow
for sufficient overnight cooling with lows generally in the 50s
for populated areas. Hilly locations where the winds wont subside
will stay closer to 70 at night.

Any midweek cooling looks minor as dry east winds stay in place.

We may not have to worry about record highs weds-Thursday but
there should still be plenty of highs in the 80s.

Latest long range ECMWF brings some stronger onshore flow by late
next weekend or early next week but temps should still be on the
warm side of normal with no rain in the forecast through the end
of the month.

Aviation As of 9:38 pm pdt Sunday... High confidenceVFR in
offshore flow through Monday night. Increasing air mass stability
under an amplifying mid to upper level thermal and height ridge
will result in surface winds tending to decouple from increasingly
gusty NE winds aloft in the bay area hills and mountains tonight
into Monday morning; low level wind shear is possible due to 925
mb NE winds reaching 25-35 knots based on NAM wrf output. Warming
due to large scale air mass compression is seen on the profiler
data from bodega bay to fort ord with shallow inversions based at
sea level to 500 feet.

Vicinity of ksfo...VFR. W-nw winds this evening shifting to light
ne tonight. Low level wind shear 06z-17z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR. Light e-se winds this evening into
Monday except SE winds becoming increasingly gusty in the salinas
valley very late tonight through Monday morning.

Fire weather As of 2:50 am pdt Monday... Light to moderate
offshore wind event seems to be unfolding about as expected.

Humidity values staying moist through 3 am with just a few of the
north bay hill sites showing signs of drying. More rapid drying
will occur through the afternoon with poor humidity recovery
forecast tonight. The strongest winds are currently remaining over
the highest hills and not see much evidence or trend for mixing
those down early this morning. None the less we still have warm,
dry and breezy conditions on tap today. Probability of new
ignitions will remain high the next few afternoons with near
record warmth and drying of the fine fuels. At this time just plan
to run generic headlines in the fire weather forecast to raise
awareness without issuing any specific watches or warnings.

Marine As of 2:50 am pdt Monday... Strong surface high pressure
over the eastern pacific will build into the great basin early to
mid week. Gusty northwesterly winds over the coastal waters will
dissipate once the northerly pressure gradient relaxes which right
now appears to be late Monday at the earliest. A strengthening
offshore wind flow pattern will tend to push the california
interior surface based thermal trough westward to the coastline,
easing surface winds over most of the coastal waters to lighter
speeds.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pt reyes 0-10 nm until 3 am
sca... Pt reyes to pigeon pt 0-10 nm until 3 am
sca... Pigeon pt to pt pinos 0-10 nm until 3 am
sca... Pigeon pt to pt piedras blancas 10-60 nm until 3 am
sca... Pt arena to pigeon pt 10-60 nm
public forecast: rww
aviation: W pi
marine: W pi
fire weather: rww
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 16 mi47 min W 1.9 G 2.9 60°F 64°F1023.3 hPa
AAMC1 - 9414750 - Alameda, CA 34 mi47 min NW 1.9 G 1.9 60°F 61°F1024.3 hPa
LNDC1 36 mi47 min NNW 1 G 1.9 59°F 1023.8 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 37 mi47 min NNW 2.9 G 2.9
OBXC1 37 mi47 min 59°F 56°F
PXSC1 38 mi47 min 60°F 55°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 38 mi47 min WNW 1.9 G 2.9 60°F 1022.8 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 38 mi47 min NNW 2.9 G 2.9 59°F 1023.9 hPa
ELXC1 - Elkhorn Slough Reserve, CA 38 mi110 min E 5.1 62°F 1023 hPa49°F
46092 - MBM1 39 mi83 min NNE 5.8 59°F 55°F1022.9 hPa (-1.0)
46042 - MONTEREY - 27NM West of Monterey Bay, CA 40 mi45 min NNW 5.8 G 7.8 57°F 56°F10 ft1022.9 hPa (-0.8)
FTPC1 - 9414290 - San Francisco, CA 40 mi53 min SSE 1.9 G 1.9 58°F 57°F1024.3 hPa
46114 - West Monterey Bay, CA 43 mi35 min 56°F10 ft
PPXC1 - 9414847 - Richmond (Point Potrero), CA 44 mi47 min NNW 1.9 G 2.9 61°F 1024.2 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 44 mi45 min NW 9.7 G 12 59°F 59°F9 ft1023 hPa (-0.9)
46237 - San Francisco Bar, CA (142) 45 mi65 min 55°F7 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 45 mi58 min Calm 58°F 1024 hPa
RCMC1 - 9414863 - Richmond, CA 46 mi53 min NNW 2.9 G 4.1 59°F 60°F1023.8 hPa
46240 - Cabrillo Point, Monterey Bay, CA (158) 48 mi44 min 57°F5 ft

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mountain View, Moffett Field, CA8 mi1.7 hrsN 010.00 miFair58°F52°F81%1024.3 hPa
San Jose, San Jose International Airport, CA8 mi42 minN 010.00 miFair55°F51°F87%1023.5 hPa
San Carlos Airport, CA18 mi40 minN 010.00 miFair57°F50°F77%1024 hPa
Hayward, Hayward Air Terminal, CA24 mi41 minNE 310.00 miFair57°F46°F69%1024.5 hPa

Wind History from NUQ (wind in knots)
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Last 24hrCalmE3CalmCalmCalmCalmN5NW6NW8N8NW10NW9NW7NW5CalmCalmW4CalmCalmCalmW3CalmCalmCalm
1 day agoCalmCalmCalmCalmCalmCalm5NW9NW9NW9NW9
G15
NW10NW6N10N6N5NW3W3SW3CalmCalmCalmCalmCalm
2 days agoCalmCalmS4S4CalmCalmW9N8N6N10N14NW8NW10W73NW33CalmCalmSW4W3W4W4W3

Tide / Current Tables for Upper Guadalupe Slough, San Francisco Bay, California
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Upper Guadalupe Slough
Click for Map
Mon -- 04:18 AM PDT     7.61 feet High Tide
Mon -- 07:24 AM PDT     Sunrise
Mon -- 10:12 AM PDT     2.98 feet Low Tide
Mon -- 10:53 AM PDT     Moonrise
Mon -- 03:15 PM PDT     9.03 feet High Tide
Mon -- 06:19 PM PDT     Sunset
Mon -- 09:15 PM PDT     Moonset
Mon -- 10:53 PM PDT     0.20 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.83.65.46.87.67.46.75.64.43.433.34.66.48.198.886.64.831.40.50.2

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
Click for Map
Mon -- 01:00 AM PDT     1.30 knots Max Flood
Mon -- 04:26 AM PDT     -0.00 knots Slack
Mon -- 07:24 AM PDT     Sunrise
Mon -- 08:08 AM PDT     -0.71 knots Max Ebb
Mon -- 10:22 AM PDT     0.00 knots Slack
Mon -- 10:53 AM PDT     Moonrise
Mon -- 12:47 PM PDT     0.87 knots Max Flood
Mon -- 03:36 PM PDT     -0.00 knots Slack
Mon -- 06:20 PM PDT     Sunset
Mon -- 08:19 PM PDT     -1.21 knots Max Ebb
Mon -- 09:15 PM PDT     Moonset
Mon -- 11:03 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.11.31.20.80.3-0.2-0.4-0.6-0.7-0.5-0.20.30.70.90.70.3-0.1-0.4-0.8-1.1-1.2-1.1-0.6-0

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of CentralWestCoast    EDIT
Geos

Wind Forecast for San Francisco/Monterey Bay Area, CA (7,2,3,4)
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Ground Weather Radar Station San Francisco Bay Area, CA
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weather_mapweather_map weather_map

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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.