Wednesday, September20, 2017 L-36.com


Marine Weather and Tides
Mountain View, 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 6:54AMSunset 7:08PM Wednesday September 20, 2017 9:38 AM PDT (16:38 UTC) Moonrise 6:17AMMoonset 6:45PM Illumination 0% Phase: New Moon; Moon at 29 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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PZZ530 San Pablo Bay Suisun Bay The West Delta And San Francisco Bay North Of The Bay Bridge- 843 Am Pdt Wed Sep 20 2017
.small craft advisory in effect from 3 pm pdt this afternoon through late tonight...
.small craft advisory in effect from Thursday afternoon through Thursday evening...
Today..W winds 10 to 20 kt increasing to 15 to 25 kt in the afternoon.
Tonight..W winds 15 to 25 kt.
Thu..NW winds 5 to 15 kt becoming W 15 to 25 kt in the afternoon.
Thu night..W winds 15 to 25 kt.
Fri..W winds 10 to 20 kt.
Sat..W winds 10 to 20 kt.
Sun..NE winds 5 to 15 kt...becoming W 10 to 20 kt.
PZZ500 843 Am Pdt Wed Sep 20 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate long-period northwest swell will continue to affect the coastal waters today as swell periods slowly decrease over the next 12 to 24 hours. SWell heights will remain above 8 feet through this evening, particularly for the northern outer waters, then decrease through the remainder of the week. Northwest winds will increase again this afternoon/evening throughout the waters.

7 Day Forecast for Marine Location Near Mountain View, CA
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location: 37.45, -122.06     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 201555
afdmtr
area forecast discussion
national weather service san francisco bay area
855 am pdt Wed sep 20 2017

Synopsis An upper level low will dominate the western portion
of the country through the work week. There is a slight chance of
rain showers or sprinkles over portions of the region this
morning as a frontal system moves through. Otherwise look for
continued cooler than average temperatures through Friday, along
with periods of breezy wind. A slow warming trend is expected to
begin over the weekend and continue into early next week.

Discussion As of 08:55 am pdt Wednesday... A weak frontal
boundary pushing southward across the region has resulted in some
light rainfall over the north bay, generally over sonoma county
with reports of a few hundredths of an inch or so. In addition,
reports coming in of sprinkles and or drizzle as far south as the
san francisco bay area. While light rainfall will be possible
through the morning as the frontal boundary passes, do not
anticipate widespread measurable precipitation. Clouds associated
with this front may linger through a good portion of the day with
clearing likely later tonight. Aside from a few minor updates to
add sprinkles as far south as the santa cruz mountains later this
morning into early afternoon, the forecast largely remains on
track. Please see the previous discussion below for additional
information.

Prev discussion As of 3:00 am pdt Wednesday... Current long wave
pattern over the CONUS is dominated by a broad upper level low
positioned over alberta canada. A second upper level low embedded
in the mean flow is near pac nw. Both of these upper level
features are easily seen on the latest water vapor imagery.

Meanwhile at the surface, a cold front is slowly moving into the
pac NW and far norcal. Kbhx radar imagery from near eureka shows
light rain showers accompanying the frontal passage.

For today, previous forecast still stands. The aforementioned
cold front will continue to track southward bringing clouds and
possible showers to portions of the bay area. The only mention of
precip in the forecast will be far northern sonoma county, but
clouds will be more widespread. If rain does occur, amounts will
be very light and only a few hundredths.

Cold air advection behind the front will bring a return to breezy
conditions this afternoon. Strongest winds will be along the
coast and over the higher terrain. Gusts of 30 to 40 mph are not
out of the question.

As the parent upper low shifts eastward so does the second upper
low and ultimately an upper trough swings across the region.

Despite the passing trough second low no precip is expected in the
bay area. One item that is more certain is a drop in temperatures.

Latest models bring 850mb down to 4 to 5 c by Thursday morning. It
will feel like a fall preview as cool overnight lows persist
Wednesday night into the weekend.

By Friday and into Saturday... High pressure begins to build over
the pac NW and norcal as the trough low pressure move east. The
building high pressure will lead to a pronounced period of warmer
and drier weather. Some of the models even develop occasional
offshore flow, which would aid in additional warming and drying.

By Sunday, MAX temps begin to creep above normal and by Monday
many locations are five degrees above normal. Lastly, by Tuesday
temps will be in the 90s for many locations with readings 10
degrees above normal.

Beaches As of 3:00 am pdt Wednesday... The first good long-
period northwest swell of the season will move through the coastal
waters over the next few days. This will bring coastal hazards to
the northwest- facing beaches with an increased likelihood of rip
currents, large shore breaks, and sneaker waves. As a result, a
beach hazards statement will remain into effect through Thursday
evening. If your plans take you to the beach this week, please
exercise beach safety and never turn your back to the ocean.

Aviation As of 8:10 am pdt Wednesday update... Low confidence
in the short-term forecast with respect to ceilings. Current fog
products shows low clouds associated with an upper-level trough
streaming southward, currently hovering over the north bay at this
time. These clouds will continue to advect southward through the
morning. Cloud heights at kuki show bkn-ovc MVFR cigs, around
025-030 feet. Satellite and surface observations will have to be
monitored closely through the morning for any changes. Light winds
will increase and become gusty this afternoon, evening, and into
the overnight hours at most TAF sites, as the upper-level trough
axis swings through the area.

Overall forecast confidence: low for cigs, moderate for winds.

Vicinity of ksfo... Ifr conditions through about 18z with low
confidence through the day with respect to ceilings. Low ceilings
arrived at the terminal earlier this morning with ovc conditions
reported as low as 600 ft. There is the potential for an all-day
bkn ovc event, though expect ceilings to rise a bit through the
day to MVFR levels. Westerly winds increasing by late morning and
becoming gusty by afternoon, gusts up to 25 kt possible.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Very low confidence with regards to cigs
for ksts and kmry this morning.VFR through about 14z before MVFR
cigs advect in from the north. Clearing time is unknown, but could
be as late as 20z. W wsw winds increase this afternoon and
evening, 10-15 kt, with gusts up to 20 kt possible.

Marine As of 08:48 am pdt Wednesday... Moderate long-period
northwest swell will continue to affect the coastal waters today
as swell periods slowly decrease over the next 12 to 24 hours.

Swell heights will remain above 8 feet through this evening,
particularly for the northern outer waters, then decrease through
the remainder of the week. Northwest winds will increase again
this afternoon evening throughout the waters.

Mtr watches warnings advisories
Tday Sca... Pt arena to pt reyes 0-10 nm from 3 pm
sca... Pt reyes to pigeon pt 0-10 nm from 3 pm
sca... Mry bay
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Sf bay from 3 pm
public forecast: rgass mm
aviation: rowe bam
marine: rowe
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 9 mi51 min ESE 4.1 G 5.1 63°F 70°F1014.1 hPa
AAMC1 - 9414750 - Alameda, CA 26 mi51 min W 5.1 G 7 64°F 68°F1014.7 hPa
LNDC1 27 mi51 min W 5.1 G 6 64°F 1014.2 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 28 mi51 min W 6 G 7
OKXC1 - 9414776 - Oakland (Berth 34), CA 29 mi51 min W 5.1 G 7 63°F 1014.2 hPa
OBXC1 29 mi51 min 63°F 62°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 30 mi51 min W 5.1 G 6 62°F 1013.2 hPa
PXSC1 30 mi51 min 63°F 63°F
FTPC1 - 9414290 - San Francisco, CA 33 mi51 min WSW 5.1 G 8.9 61°F 65°F1014.6 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 35 mi51 min SSW 5.1 G 8 65°F 1014.3 hPa
RCMC1 - 9414863 - Richmond, CA 38 mi51 min S 1.9 G 2.9 64°F 66°F1014 hPa
46237 - San Francisco Bar, CA (142) 38 mi69 min 62°F5 ft
MZXC1 - 9415102 - Martinez-Amorco CA 41 mi51 min W 9.9 G 12 65°F 68°F1013.9 hPa61°F
PCOC1 - 9415144 - Port Chicago, CA 42 mi51 min WSW 11 G 13 64°F 68°F1013.5 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 42 mi51 min W 11 G 15 66°F 1013 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 43 mi51 min WSW 7 G 12 64°F 1013.5 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 44 mi49 min W 7.8 G 9.7 62°F 61°F8 ft1014.2 hPa (-0.3)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 46 mi49 min WSW 5.8 G 7.8 60°F 59°F7 ft1014.4 hPa (-0.5)
ELXC1 - Elkhorn Slough Reserve, CA 47 mi114 min NE 2.9 53°F 1014 hPa52°F
46092 - MBM1 48 mi94 min N 3.9 59°F 59°F1015 hPa (+0.0)
46042 - MONTEREY - 27NM West of Monterey Bay, CA 49 mi49 min N 3.9 G 5.8 60°F 62°F9 ft1014.9 hPa (+0.0)

Wind History for Redwood City, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mountain View, Moffett Field, CA1 mi1.7 hrsSSE 310.00 miOvercast63°F57°F81%1015.5 hPa
Palo Alto Airport, CA4 mi2.9 hrsWNW 510.00 miOvercast63°F57°F83%1014.9 hPa
San Jose, San Jose International Airport, CA9 mi46 minSE 52.50 miFog/Mist60°F57°F90%1014.9 hPa
San Carlos Airport, CA11 mi52 minVar 38.00 miOvercast63°F57°F83%1014.9 hPa
Hayward, Hayward Air Terminal, CA15 mi45 minSSW 510.00 miOvercast63°F57°F84%1015.4 hPa
San Jose / Reid / Hillv, CA15 mi52 minN 010.00 miOvercast63°F53°F73%1015.6 hPa
Oakland, Metro Oakland International Airport, CA19 mi46 minW 710.00 miOvercast64°F61°F90%1014.3 hPa
San Francisco, San Francisco International Airport, CA20 mi1.7 hrsNNW 38.00 miOvercast62°F59°F90%1014.5 hPa
Livermore, Livermore Municipal Airport, CA21 mi46 minSW 710.00 miOvercast62°F57°F84%1013.9 hPa
Half Moon Bay Airport, CA24 mi44 minN 00.50 miFog59°F0°F%1013.9 hPa

Wind History from NUQ (wind in knots)
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Last 24hrN6N10NW8N11N11N10N10NW11NW9NW8NW5NW7NW6CalmCalmCalmCalmCalmCalmCalmCalmW3S3S4
1 day agoCalm3NE6N13N17N13N12W9
G16
NW8
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NW6W76Calm3W8NW3NW4NW3W6W7CalmW5NW45
2 days agoCalmNE5N5N5N9N10N12N17NW13
G18
NW8NW5N7CalmSE3SW3S3S5S4S3SE6S5S3SE3SE6

Tide / Current Tables for Calaveras Point, west of, San Francisco Bay, California
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Calaveras Point
Click for Map
Wed -- 01:03 AM PDT     8.83 feet High Tide
Wed -- 06:54 AM PDT     Sunrise
Wed -- 07:17 AM PDT     Moonrise
Wed -- 07:48 AM PDT     0.42 feet Low Tide
Wed -- 01:47 PM PDT     8.63 feet High Tide
Wed -- 07:07 PM PDT     Sunset
Wed -- 07:45 PM PDT     Moonset
Wed -- 08:10 PM PDT     1.01 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
8.18.88.47.25.43.41.70.70.41.22.84.86.88.28.686.64.72.91.611.42.94.8

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
Wed -- 01:27 AM PDT     -0.00 knots Slack
Wed -- 05:49 AM PDT     -1.32 knots Max Ebb
Wed -- 06:54 AM PDT     Sunrise
Wed -- 07:17 AM PDT     Moonrise
Wed -- 08:17 AM PDT     0.01 knots Slack
Wed -- 10:57 AM PDT     1.56 knots Max Flood
Wed -- 01:59 PM PDT     -0.00 knots Slack
Wed -- 06:12 PM PDT     -1.20 knots Max Ebb
Wed -- 07:07 PM PDT     Sunset
Wed -- 07:45 PM PDT     Moonset
Wed -- 08:34 PM PDT     0.00 knots Slack
Wed -- 11:13 PM PDT     1.50 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.10.4-0.3-0.7-1.1-1.3-1.3-1-0.30.71.31.61.40.8-0-0.5-0.8-1.1-1.2-1-0.50.41.11.5

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 (12,3,4,5)
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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.