Wednesday, March29, 2017 L-36.com


Marine Weather and Tides
El Granada, CA

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:56AMSunset 7:32PM Wednesday March 29, 2017 4:02 PM PDT (23:02 UTC) Moonrise 7:16AMMoonset 8:36PM Illumination 6% Phase: Waxing Crescent; Moon at 2 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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PZZ545 Point Reyes To Pigeon Point To 10 Nm- 210 Pm Pdt Wed Mar 29 2017
.small craft advisory for rough bar in effect until 6 pm pdt this evening...
.small craft advisory in effect through late Thursday night...
Tonight..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 8 to 10 ft at 15 seconds. Slight chance of showers after midnight.
Thu..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 8 to 9 ft at 14 seconds. Slight chance of showers in the morning.
Thu night..NW winds 20 to 30 kt. Wind waves 5 to 7 ft. NW swell 8 to 9 ft at 14 seconds.
Fri..N winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 8 to 10 ft at 12 seconds.
Fri night..NW winds 20 to 30 kt. Wind waves 4 to 6 ft. NW swell 9 to 12 ft at 12 seconds.
Sat..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 8 to 10 ft.
Sun..NW winds 20 to 30 kt. Wind waves 4 to 6 ft. W swell 13 to 16 ft.
Mon..NW winds 15 to 25 kt. Wind waves 4 to 6 ft. W swell 13 to 16 ft...decreasing to 9 to 12 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 8 to 10 ft with a dominant swell period of 15 seconds. Across the bar...combined seas 9 to 11 ft at 15 seconds. Maximum ebb current of 1.5 knots at 04:54 pm Wednesday and 1.8 knots at 05:12 am Thursday.
PZZ500 210 Pm Pdt Wed Mar 29 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure off the california coast will keep moderate northwest winds through this evening. Winds will briefly decrease tonight as the high weakens but will increase again Thursday through Friday as strong low pressure develops over the intermountain region. Long period swells will continue through this evening. A larger long-period swell is expected to arrive Sunday night and Monday.

7 Day Forecast for Marine Location Near El Granada, CA
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location: 37.5, -122.48     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 292057
afdmtr
area forecast discussion
national weather service san francisco bay area
157 pm pdt Wed mar 29 2017

Synopsis Cooler and breezy conditions return to the region
on Thursday as a cold front sweeps through overnight. This system
will result in a chance of very light precipitation from late
tonight into early Thursday morning, however most locations will
not receive measurable rainfall. Breezy to gusty winds will be
possible from late Thursday into Friday. A warming trend is then
expected for the upcoming weekend as high pressure rebuilds over
the region.

Discussion As of 01:56 pm pdt Wednesday... High pressure aloft
has resulted in mainly clear skies and seasonably mild
temperatures across the region this afternoon. Meanwhile,
unsettled conditions continue to impact the pacific northwest and
northern california as a system approaches from the north. This
system will dive southward overnight as the main mid/upper level
trough pushes inland well to our north. This system will bring a
slight chance of light precipitation to portions of the region
beginning late tonight over the north bay and then through the san
francisco bay area and central coast early Thursday morning. Most
of the short-rage models show this system producing only very
light rainfall amounts, generally a few hundredths of an inch or
so for locations that do experience precipitation. However, this
may result in wet roadways for the Thursday morning commute across
much of the greater san francisco bay area.

In wake of this frontal passage, daytime temperatures on Thursday
will be at least 5 to 10 degrees cooler compared to today.

Conditions will likely feel even cooler as breezy northerly winds
develop region-wide. Wind speeds are forecast to increase further
Thursday night into Friday as the main upper level system drops
southward into the desert southwest and surface pressure gradients
tighten along the coast. With this, the strongest winds are
likely in the higher elevations across the region with wind gusts
in excess of 45 mph likely. Thus, a wind advisory will likely be
posted overnight in the hills/mountains for the Thursday
night/Friday time frame.

While winds are forecast to diminish some late Friday into
Saturday, cannot rule out breezy conditions in some of the higher
elevations. However, a warming trend is expected for the weekend
as high pressure rebuilds back over the region as the mid/upper
level trough exits to the east. Temperatures fall back to near
seasonal averages for early next week as northwesterly flow aloft
returns and another weather system pushes inland to our north.

With that said, dry weather conditions are likely to persist for
our region through the middle of next week.

The longer range guidance continues to show a return to wet
weather conditions by late next week. The models generally agree
that a more potent weather system will drop southward into
northern california by Thursday or Friday of next week with a
moderate moisture tap. Both the GFS and ECMWF show widespread
rainfall across the region by next Friday. However, being more
than a week out, confidence remains low at this time and changes
to the forecast are likely.

Aviation As of 10:30 am... Clear skies with light winds this
morning. Winds will increase in the afternoon as onshore gradients
tighten up. Models consistent in bringing low level moisture into
the area after 06z as a strong shortwave approaches the area.

This will translate into ifr CIGS over most terminals. Clearing
will take rapidly Thursday morning after the shortwave passes.

Vicinity of ksfo...VFR today with west winds to gusting to 25 kt
after 20z. Ifr CIGS after 06z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR today. Ifr after 06z.

Marine As of 08:57 am pdt Wednesday... High pressure off the
california coast will keep moderate northwest winds through the
day. Winds will briefly decrease tonight as the high weakens but
will increase again Thursday through Friday as strong low
pressure develops over the intermountain region.

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 from 3 am
sca... Pigeon pt to pt piedras blancas 10-60 nm until 3 pm
sca... Pigeon pt to pt piedras blancas 10-60 nm from 3 am
sca... Rough bar advisory for sf bar until 6 pm
sca... Mry bay until 3 am
sca... Sf bay until 9 pm
public forecast: rgass
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 14 mi62 min WNW 8.9 G 14 67°F 61°F1020.5 hPa (-0.9)
AAMC1 - 9414750 - Alameda, CA 21 mi62 min W 5.1 G 8 65°F 59°F1021.2 hPa (-1.4)
46237 - San Francisco Bar, CA (142) 21 mi62 min 56°F8 ft
PXSC1 21 mi62 min 66°F 50°F
FTPC1 - 9414290 - San Francisco, CA 21 mi62 min WSW 14 G 19 59°F 55°F1020.8 hPa (-1.5)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 22 mi62 min WSW 8.9 G 12
OBXC1 22 mi62 min 63°F 51°F
LNDC1 23 mi68 min WSW 9.9 G 11 64°F 1020.9 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 23 mi62 min WSW 6 G 9.9 65°F 1020.8 hPa (-1.5)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 23 mi72 min WNW 19 G 23 55°F 56°F12 ft1021.6 hPa (-1.2)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 26 mi72 min NW 18 G 21 54°F 53°F10 ft1021.7 hPa (-1.4)
RCMC1 - 9414863 - Richmond, CA 29 mi62 min S 8 G 8.9 63°F 57°F1020.2 hPa (-1.6)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 29 mi62 min SSW 12 G 14 60°F 1020.8 hPa (-1.6)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 40 mi62 min WSW 8 G 9.9 65°F 1019.8 hPa (-1.8)
MZXC1 - 9415102 - Martinez-Amorco CA 41 mi62 min WNW 8 G 9.9 68°F 57°F1020.4 hPa (-1.3)42°F
UPBC1 42 mi62 min W 11 G 13
PCOC1 - 9415144 - Port Chicago, CA 45 mi44 min WSW 11 G 14 69°F 58°F1019.5 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 49 mi62 min NW 12 G 17 69°F 1019.4 hPa (-1.4)
46042 - MONTEREY - 27NM West of Monterey Bay, CA 49 mi72 min 19 G 25 56°F 56°F11 ft1021.5 hPa (-0.9)

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA1 mi67 minNNW 125.00 miFair with Haze59°F53°F82%1022.3 hPa
San Francisco, San Francisco International Airport, CA10 mi66 minW 1710.00 miMostly Cloudy63°F50°F63%1021.1 hPa
San Carlos Airport, CA12 mi75 minNW 1310.00 miMostly Cloudy70°F41°F35%1021.3 hPa
Palo Alto Airport, CA19 mi75 minNNW 1210.00 miClear70°F53°F57%1021 hPa
Oakland, Metro Oakland International Airport, CA20 mi69 minW 1210.00 miPartly Cloudy67°F53°F61%1021.1 hPa
Hayward, Hayward Air Terminal, CA22 mi68 minW 910.00 miFair65°F50°F59%1022.2 hPa
Mountain View, Moffett Field, CA23 mi66 minNNW 1510.00 miFair67°F51°F57%1021.4 hPa

Wind History from SFO (wind in knots)
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Last 24hrW21W23W18W25W15W14W11W10W7W6W13W14W9W9W12NW5W7CalmE3NE3W18W19W18
G24
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1 day agoW22W23
G27
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W13W16W10W10W12W8W6W7W8S4W8NW5NW4W7NW104W16W17W19
G26
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2 days agoS11S12S15S14S8W10W16W14W9W12W13W8NW4NW7NW7W10W12NW10NW13NW14
G23
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G27
W22
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W26
G32

Tide / Current Tables for Princeton, Half Moon Bay, California
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Princeton
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Wed -- 06:12 AM PDT     -0.00 feet Low Tide
Wed -- 06:59 AM PDT     Sunrise
Wed -- 08:15 AM PDT     Moonrise
Wed -- 12:34 PM PDT     5.12 feet High Tide
Wed -- 06:21 PM PDT     0.81 feet Low Tide
Wed -- 07:30 PM PDT     Sunset
Wed -- 09:36 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.65.34.32.91.50.500.212.13.34.455.14.53.52.31.40.811.72.73.95

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
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San Mateo Bridge
Click for Map
Wed -- 02:49 AM PDT     -0.00 knots Slack
Wed -- 06:08 AM PDT     -1.93 knots Max Ebb
Wed -- 06:58 AM PDT     Sunrise
Wed -- 08:14 AM PDT     Moonrise
Wed -- 09:10 AM PDT     0.01 knots Slack
Wed -- 11:59 AM PDT     2.03 knots Max Flood
Wed -- 03:30 PM PDT     -0.00 knots Slack
Wed -- 06:33 PM PDT     -1.63 knots Max Ebb
Wed -- 07:29 PM PDT     Sunset
Wed -- 09:24 PM PDT     0.00 knots Slack
Wed -- 09:35 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.91.50.8-0.1-0.9-1.6-1.9-1.7-1-0.20.91.721.81.30.5-0.4-1.1-1.6-1.6-1-0.30.51.4

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 (19,4,5,8)
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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.