Thursday, February22, 2018 L-36.com


Marine Weather and Tides
Piedmont, 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 6:46AMSunset 5:57PM Thursday February 22, 2018 2:54 PM PST (22:54 UTC) Moonrise 10:56AMMoonset 12:00AM Illumination 52% Phase: First Quarter Moon; Moon at 8 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- 225 Pm Pst Thu Feb 22 2018
.small craft advisory in effect until 10 pm pst this evening...
Tonight..NW winds 15 to 25 kt. Occasional gusts up to 35 kt in the evening.
Fri..N winds 5 to 15 kt.
Fri night..W winds 5 to 15 kt.
Sat..NW winds 10 to 20 kt.
Sat night..NW winds 10 to 20 kt.
Sun..W winds 15 to 25 kt.
Mon..NW winds 10 to 20 kt. Chance of showers, then slight chance of showers.
Tue..NW winds 10 to 20 kt. Slight chance of showers.
PZZ500 225 Pm Pst Thu Feb 22 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Blustery northerly winds across the coastal waters this afternoon and tonight with gale force gusts possible over the outer waters. Strong winds will generate steep wind waves creating hazardous seas. Winds will begin to decrease tomorrow, but remain high enough for small craft advisories. Scattered showers will continue to stream over the waters this afternoon. Another upper-level disturbance will move then into the region early next week.

7 Day Forecast for Marine Location Near Piedmont, CA
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location: 37.85, -122.22     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 222145
afdmtr
area forecast discussion
national weather service san francisco bay area
145 pm pst Thu feb 22 2018

Synopsis A weak weather system will impact the area today
bringing widely scattered showers, a slight chance of
thunderstorms in the afternoon, and lowering snow levels. This
system will also bring gusty winds and colder temperatures by
Friday morning. Dry weather and slightly warmer temperatures are
expected for the weekend. Cooler, unsettled weather to return
early next week.

Discussion As of 02:00 pm pst Thursday... Unsettled weather
continues today as a 535dm 500mb upper low centered over
northeastern oregon continues to slide southward toward california
early this afternoon. Northwest winds increased as the base of the
trough approaching the area, tightening the onshore gradient.

Sustained winds of 20 to 30 mph with gusts generally 35 to around 45
mph have been reported so far across many areas, but particularly
along the coast and over the higher terrain. The strongest wind
speed thus so far was 43 mph, which was reported at several
locations: whale point, mt diablo, altamont pass, point reyes,
and point arena. The colder air in the base of this trough has now
entered into proximity of the san francisco bay and monterey bay
areas, and as a result, scattered to numerous convective showers
are being detected by kmux kgo and kpix radars. Most of these
showers have been light so far, with only very minors
accumulations of a few to several hundredths of an inch reported.

As even colder air advects into our region, look for snow levels
to gradually drop from 3000 feet down to 2000 feet, with light
dustings of snow down to these elevations. Additionally, look for
these rain and snow showers to strengthen and become more
widespread through the remainder afternoon and into the early
evening. Small hail and a few isolated thunderstorms are even
possible as these storm cells continue to strengthen through the
remainder of the day. Overall, the forecast is panning out about
as expected as our forecast area remains on the drier windier
backside of this storm system.

By tonight, much colder air will advect in with the core of the
upper low, resulting in another round of near to subfreezing
temperatures for the area tonight tomorrow morning. These
temperatures will not be quite as cold as Monday night Tuesday
morning, but widespread upper 20s to upper 30s are forecast. As a
result, take any necessary precautions to protect any vulnerable
plants, pets, and populations ahead of these cold overnight
temperatures.

Looking ahead, temperatures rebound slightly over the coming days
as a weak shortwave ridge develops over the area late tomorrow
through the upcoming weekend. Forecast models show a pair of more
organized but still relatively dry storm systems moving through
the forecast area through the duration of next week. This means
that this cool, unsettled weather is not going anywhere anytime
soon. Precipitation amounts with the storm systems next week are
likely to exceed those of this week (which won't be difficult
given locations such as downtown san francisco are at 0.00" for
the month), however, these storms presently do not appear to be
fueled by extremely wet subtropical moisture plumes that we
usually associated with our wetter storm systems (generally

50- 66" of tpw -- we usually want to see >1.0" for wetter
events). Stay tuned as we track these upcoming storms.

Aviation As of 9:56 am pst Thursday for 18z tafs...VFR
conditions to prevail with occasional MVFR CIGS possible. Strong
west to northwest winds will continue to increase into the
afternoon with sustained winds of 15 to 25 kt and gusts over 30
kt. Sfo may reach gusts up to 40 kt this afternoon and this
evening. Scattered showers expected this afternoon and into the
early evening. Isolated thunderstorms are possible, but will
mainly be confined to the east.

Vicinity of ksfo...VFR conditions to prevail with occasional sct
cigs at around 3000 to 4000 ft. West to northwest winds have
already occasionally gusted to 34 kt. Winds will increase this
afternoon with more frequent higher gusts. Sustained winds are
expected around 25 kt this afternoon with gusts of 35 to 40 kt
possible. An airport weather warning has already been issued from
12 pm (20z) to 7 pm (03z) this evening. Winds will remain gusty
tonight and into early tomorrow morning. Updates will be made as
necessary. Scattered showers in the vicinity possible starting
this afternoon.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR. Scattered clouds throughout the day
with strong onshore winds this afternoon. Sustained winds around
20 kt at kmry and nearly 25 kt at ksns with gusts approaching 30
kt. Winds will start to decrease late tonight into tomorrow
morning.

Marine As of 08:32 am pst Thursday... Expect increasing
northerly winds across the coastal waters today as an upper-level
disturbance moves through the region. This system will produce
gale-force winds over the outer waters. Strong winds will result
in steep wind waves and hazardous seas.

Mtr watches warnings advisories
Tngt Sca... Pigeon pt to pt pinos 0-10 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
glw... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm until 5 pm
glw... Pigeon pt to pt piedras blancas 10-60 nm from 5 pm
sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm
sca... Mry bay until 3 am
sca... Sf bay until 10 pm
public forecast: drp
aviation: as
marine: as
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LNDC1 5 mi54 min W 17 G 23 51°F 1022.4 hPa (-2.3)
OBXC1 7 mi54 min 51°F 39°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 7 mi54 min W 19 G 25 50°F 1022.3 hPa (-2.5)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 7 mi54 min W 22 G 26
AAMC1 - 9414750 - Alameda, CA 7 mi54 min WNW 18 G 23 51°F 53°F1022.6 hPa (-2.3)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 9 mi60 min WNW 14 G 20 54°F 1022.4 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 10 mi54 min W 12 G 21 51°F 1021.6 hPa (-2.2)
PXSC1 10 mi54 min 52°F 37°F
RCMC1 - 9414863 - Richmond, CA 11 mi54 min NW 16 G 23 52°F 53°F1022 hPa (-2.3)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 12 mi45 min NW 13 51°F 1022 hPa
FTPC1 - 9414290 - San Francisco, CA 13 mi54 min WNW 12 G 19 50°F 54°F1023.2 hPa (-1.9)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 14 mi54 min NW 16 G 21 52°F 1021.5 hPa (-2.8)
MZXC1 - 9415102 - Martinez-Amorco CA 14 mi54 min WNW 11 G 14 48°F 53°F1021.9 hPa (-2.8)41°F
PCOC1 - 9415144 - Port Chicago, CA 17 mi54 min W 9.9 G 13 48°F 52°F1021.5 hPa (-2.8)
46237 - San Francisco Bar, CA (142) 22 mi54 min 52°F5 ft
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 22 mi60 min WNW 9.9 G 14 49°F 1021.3 hPa
RTYC1 - 9414523 - Redwood City, CA 24 mi54 min W 17 G 25 51°F 53°F1023.7 hPa (-2.0)
SFXC1 - San Francisco Bay Reserve, CA 26 mi69 min WSW 9.9 54°F 1021 hPa37°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 33 mi64 min NW 21 G 29 49°F 51°F6 ft1023.3 hPa (-1.9)
PRYC1 - 9415020 - Point Reyes, CA 41 mi54 min WNW 16 G 22 51°F1023.1 hPa (-1.6)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 49 mi64 min NW 18 G 21 50°F 53°F7 ft1023.8 hPa (-1.6)

Wind History for Oakland Middle Harbor, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA10 mi61 minW 2210.00 miPartly Cloudy and Breezy54°F37°F55%1022.6 hPa
Concord, Buchanan Field, CA13 mi61 minNW 16 G 267.00 miRain50°F39°F68%1020.8 hPa
Hayward, Hayward Air Terminal, CA14 mi60 minW 18 G 2310.00 miPartly Cloudy and Breezy55°F36°F49%1023.7 hPa
San Francisco, San Francisco International Airport, CA18 mi58 minW 21 G 3110.00 miMostly Cloudy and Breezy55°F37°F51%1023.1 hPa
San Carlos Airport, CA22 mi67 minWNW 17 G 2510.00 miMostly Cloudy54°F35°F51%1023.4 hPa
Livermore, Livermore Municipal Airport, CA24 mi61 minSW 1010.00 miLight Rain50°F41°F71%1021.9 hPa

Wind History from OAK (wind in knots)
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Last 24hrNW11W9NW9W13W14NW10NW7CalmNW9W9NE4W15W9W16W13W19W15W11NW6NW14
G18
NW13W17W19W22
1 day agoW7W10W6W13W12W10W10W9SW5W4E3E6SE9E6CalmE3CalmNE5NE1044W9W9W11
2 days agoW7NW4NE15
G18
NE3NW4NW6NW7N9
G17
N9N6N5N6N4CalmCalmNE4NE4CalmS3S5S5S5W6SW5

Tide / Current Tables for Berkeley, San Francisco Bay, California
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Berkeley
Click for Map
Thu -- 04:13 AM PST     5.78 feet High Tide
Thu -- 06:50 AM PST     Sunrise
Thu -- 10:56 AM PST     Moonrise
Thu -- 11:04 AM PST     0.96 feet Low Tide
Thu -- 05:36 PM PST     4.04 feet High Tide
Thu -- 05:55 PM PST     Sunset
Thu -- 10:44 PM PST     2.32 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.93.84.75.45.85.654.12.91.91.211.11.72.333.6443.83.32.82.42.3

Tide / Current Tables for Oakland Harbor WebStreeter Street, San Francisco Bay, California Current
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Oakland Harbor WebStreeter Street
Click for Map
Thu -- 01:23 AM PST     0.73 knots Max Flood
Thu -- 04:18 AM PST     -0.00 knots Slack
Thu -- 06:49 AM PST     Sunrise
Thu -- 07:26 AM PST     -1.11 knots Max Ebb
Thu -- 10:56 AM PST     Moonrise
Thu -- 11:18 AM PST     0.01 knots Slack
Thu -- 02:23 PM PST     0.74 knots Max Flood
Thu -- 05:40 PM PST     -0.00 knots Slack
Thu -- 05:55 PM PST     Sunset
Thu -- 07:55 PM PST     -0.65 knots Max Ebb
Thu -- 11:01 PM PST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.70.70.50.1-0.3-0.8-1.1-1.1-0.8-0.5-0.10.20.60.70.70.50.3-0.1-0.5-0.7-0.5-0.3-0

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 (17,4,5,8)
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Ground Weather Radar Station Sacramento, 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.