Tuesday, January16, 2018 L-36.com


Marine Weather and Tides
El Granada, 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 7:21AMSunset 5:18PM Tuesday January 16, 2018 1:23 AM PST (09:23 UTC) Moonrise 7:01AMMoonset 5:14PM 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
    EDIT      (on/off)   Help
PZZ545 Point Reyes To Pigeon Point To 10 Nm- 809 Pm Pst Mon Jan 15 2018
.small craft advisory for rough bar in effect through Tuesday evening...
Tonight..S winds 10 kt. Wind waves 2 ft or less. W swell 10 to 13 ft at 17 seconds. Chance of rain in the evening, then rain likely after midnight.
Tue..NW winds 10 kt. Wind waves 2 ft or less. W swell 12 to 14 ft at 16 seconds. Chance of rain in the morning.
Tue night..N winds 10 kt. Wind waves 2 ft or less. W swell 11 to 13 ft at 15 seconds.
Wed..SE winds 10 kt. Wind waves 2 ft or less. W swell 9 to 11 ft at 15 seconds.
Wed night..S winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 9 to 12 ft at 21 seconds. Slight chance of rain.
Thu..W winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 16 to 19 ft. Chance of rain, then chance of showers.
Fri..W winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 13 to 16 ft. Chance of showers, then slight chance of showers.
Sat..W winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 11 to 14 ft. Slight chance of rain.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 10 to 13 ft at 17 seconds. Across the bar...combined seas 12 to 16 ft at 17 seconds. Maximum ebb current of 1.4 knots at 04:01 am Tuesday and 2.8 knots at 03:43 pm Tuesday.
PZZ500 809 Pm Pst Mon Jan 15 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Southwesterly winds will continue tonight as a storm system approaches from the west. A longer period swell will continue to impact the coast through Tuesday. A larger and more powerful swell will arrive Wednesday night or Thursday morning.

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


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kmtr 160601
afdmtr
area forecast discussion
national weather service san francisco bay area
1001 pm pst Mon jan 15 2018

Synopsis A weakening storm system will bring light rainfall to
mainly the northern half of the region through Tuesday morning.

Conditions then dry out late Tuesday into Wednesday before another
weak system brings additional rainfall to much of the region.

With a colder air mass in place, lingering showers are likely on
Friday. A drying trend and cooler temperatures are forecast for
the weekend before a third, potentially stronger system, arrives
late in the weekend.

Discussion As of 9:01 pm pst Monday... Models appear to have a
good handle on the current weather situation this evening. Light
rain has been reported over sonoma and marin for the last few
hours with accumulations anywhere from a hundredth to just under
a tenth of an inch. The approaching system will bring light rain
to the north bay region through late this evening with light
rain spreading south across the greater san francisco bay area
overnight. While the north bay area will see the bulk of the
precip with storm totals around 0.3" to 0.5", models indicate the
trailing end of the frontal boundary will deposit anywhere from
0.1" to 0.2" across the bay area as the front dissipates. The
santa cruz mountain will likely see slightly more due to the
terrain unfortunately little to none is expected from the
monterey bay south.

So far the winds have stayed fairly light with sustained winds
around 5 to 10 mph. Higher elevations in the north and east
bays continue to see elevated gusts to around 20 mph. Breezy
conditions are expected to accompany frontal passage overnight
however widespread gusty winds are not anticipated.

Weak ridging, anticipated for Tuesday and Wednesday, will bring
a return to dry conditions and near normal temperatures as the
region transitions between system.

From previous discussion... Our next system is forecast to arrive
late Wednesday into Thursday and bring additional rainfall to the
region. This system too appears to be generally weak as the bulk
of mid upper level support remains well north of the region.

However, much colder air is forecast to advect southward and
result in lowering snow levels across the state. With a colder air
mass and mid upper level trough aloft, do expect lingering post
frontal showers into Friday. Additional rainfall amounts range
from around 1 4" to 1 2" for most urban areas (greatest in the
north bay and along the coast) with less than 1 4" for our drier
inland valleys. Coastal ranges in the north bay could see upwards
of around 1" with amounts closer to 1 2" for the coastal ranges to
the south.

As conditions dry out late Friday into Saturday, colder overnight
conditions are likely. Look for widespread 30s inland with lower 40s
near the coast Friday night into Saturday morning and again Saturday
night into Sunday morning. Much of this will depend on how much
clearing occurs this weekend so be sure to check back for updated
forecast information.

The forecast models continue to show the potential for a stronger
system to impact the region late in the weekend into early next
week. However, the models and run-to-run solutions do differ on the
details at this time. With that said, do look for widespread
rainfall and slightly stronger winds with this third system. Again,
stay tuned for additional details on potential impacts.

Aviation As of 10:00 pm pst Monday... Little change from the
previous TAF package as light rain is forecast to move across
some of the terminals tonight. Main focus will be north of san
jose. CIGS remain tricky although koak has now dropped down to
MVFR level along with ksts. That should continue into the morning.

Winds generally under 10 kt. Moderate confidence.

Vicinity of ksfo... Latest cig is around 035 which is close to
thinking from the previous package. Would expect it to drop to
around 025 in the next couple of hours. Models continue to show
rain returning around 10z possibly lasting for a few hours.

However, generally returning to dry weather by or even before 14z.

Vfr after 16z. Moderate confidence.

Sfo bridge approach... Rain favored for northern portion of the
approach over the southern portion. Otherwise similar to sfo.

Monterey bay terminals... GenerallyVFR through the period as the
system will be too far to the north. Potential for mvrf at kmry
after 10z. Ksns has already dropped down to ifr and will likely be
there all night.VFR after 16z tomorrow. Moderate to high
confidence.

Marine As of 8:09 pm pst Monday... Southwesterly winds will
continue tonight as a storm system approaches from the west. A
longer period swell will continue to impact the coast through
Tuesday. A larger and more powerful swell will arrive Wednesday
night or Thursday morning.

Mtr watches warnings advisories
Tday High surf advisory... Caz006-505-509-529-530
sca... Rough bar advisory for sf bar
public forecast: cw
aviation: bell
marine: bell
visit us at

Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 14 mi53 min ESE 4.1 G 5.1 55°F 55°F1021.9 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 21 mi53 min NNW 1 G 1.9 54°F 1020.5 hPa
PXSC1 21 mi53 min 56°F 56°F
46237 - San Francisco Bar, CA (142) 21 mi53 min 54°F9 ft
AAMC1 - 9414750 - Alameda, CA 21 mi53 min ESE 1.9 G 4.1 55°F 54°F1021.6 hPa
OBXC1 22 mi53 min 55°F 55°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 22 mi53 min NE 4.1 G 4.1
LNDC1 23 mi53 min Calm G 1.9 56°F 1021.4 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 23 mi93 min S 7.8 G 9.7 57°F 57°F12 ft1021.1 hPa (+1.7)
OKXC1 - 9414776 - Oakland (Berth 34), CA 23 mi53 min NE 2.9 G 2.9 54°F 1021.5 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 26 mi93 min S 7.8 G 9.7 55°F 54°F10 ft1021.4 hPa (+1.6)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 27 mi59 min SE 2.9 55°F 1022 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 29 mi59 min ESE 1.9 G 2.9 56°F 1021.8 hPa
RCMC1 - 9414863 - Richmond, CA 29 mi53 min Calm G 1 55°F 53°F1021.4 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 40 mi65 min E 7 G 8.9 51°F 1021.3 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 41 mi53 min E 1.9 G 2.9 49°F 52°F1021.9 hPa49°F
PRYC1 - 9415020 - Point Reyes, CA 43 mi53 min ESE 7 G 8.9 54°F1020.4 hPa
PCOC1 - 9415144 - Port Chicago, CA 45 mi53 min ENE 1.9 G 2.9 49°F 51°F1021.6 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 49 mi59 min NNE 1 G 1.9 49°F 1021.8 hPa

Wind History for Redwood City, CA
(wind in knots)    EDIT      (on/off)   Help
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
Last
24hr
S3
E1
SW2
W2
W2
N4
E2
S4
NW2
N3
E2
E2
N4
N5
W5
NW6
NW2
W1
N4
E1
--
--
W2
SE2
1 day
ago
SW4
S4
S3
S3
S1
SW2
S2
S3
SE1
E3
E3
E1
E1
E1
--
N3
NE3
NW1
NW1
E2
S3
S1
W6
W2
2 days
ago
SW1
SW1
W1
SE3
S1
E4
E4
E3
E2
E4
E4
E4
E1
SE3
SE3
S3
S3
S4
S4
SE2

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA1 mi28 minE 31.75 miFog/Mist55°F55°F100%1020.7 hPa
San Francisco, San Francisco International Airport, CA10 mi27 minN 09.00 miOvercast57°F54°F90%1021.2 hPa
San Carlos Airport, CA12 mi28 minS 310.00 miMostly Cloudy55°F51°F88%1021.3 hPa
Palo Alto Airport, CA19 mi4.6 hrsN 07.00 miPartly Cloudy50°F50°F100%1020.3 hPa
Oakland, Metro Oakland International Airport, CA20 mi30 minESE 58.00 miOvercast55°F52°F90%1021.4 hPa
Hayward, Hayward Air Terminal, CA22 mi29 minESE 78.00 miOvercast56°F48°F75%1022.1 hPa
Mountain View, Moffett Field, CA23 mi27 minSE 510.00 miFair51°F50°F96%1021.8 hPa

Wind History from HAF (wind in knots)
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
-12
PM
1
AM
Last 24hrNE4CalmCalmCalmCalmCalmN3CalmSE7S8S6SE8S6SE4SE6SE6SE4SE6SE6SE4S3SE4SE4SE4
1 day agoCalmCalmNW3CalmCalmNE3CalmNW6CalmS4W4W7S3CalmSE3CalmNE3CalmCalmS11NW8N4CalmCalm
2 days agoNW3E6NE8NW3NW6
G20
NE8
G16
NE4E14
G25
W6
G16
W6
G15
N8NE12NE10NE6NE8CalmE6CalmCalmNE3CalmCalmNW4Calm

Tide / Current Tables for Princeton, Half Moon Bay, California
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Princeton
Click for Map
Tue -- 03:46 AM PST     2.92 feet Low Tide
Tue -- 07:00 AM PST     Moonrise
Tue -- 07:23 AM PST     Sunrise
Tue -- 09:26 AM PST     5.83 feet High Tide
Tue -- 04:31 PM PST     -0.44 feet Low Tide
Tue -- 05:14 PM PST     Moonset
Tue -- 05:16 PM PST     Sunset
Tue -- 06:18 PM PST     New Moon
Tue -- 11:30 PM PST     4.51 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.33.93.432.93.23.84.65.35.85.85.24.12.71.30.2-0.4-0.40.1123.13.94.4

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
   EDIT      (on/off)   Help   One Week of Data
San Mateo Bridge
Click for Map
Tue -- 01:27 AM PST     -0.00 knots Slack
Tue -- 03:57 AM PST     -0.80 knots Max Ebb
Tue -- 06:44 AM PST     0.00 knots Slack
Tue -- 07:00 AM PST     Moonrise
Tue -- 07:22 AM PST     Sunrise
Tue -- 09:21 AM PST     1.25 knots Max Flood
Tue -- 12:27 PM PST     -0.00 knots Slack
Tue -- 04:03 PM PST     -1.83 knots Max Ebb
Tue -- 05:12 PM PST     Moonset
Tue -- 05:15 PM PST     Sunset
Tue -- 06:18 PM PST     New Moon
Tue -- 07:38 PM PST     0.01 knots Slack
Tue -- 10:30 PM PST     1.72 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.10.4-0.3-0.7-0.8-0.7-0.40.20.81.21.20.90.3-0.4-1.1-1.6-1.8-1.6-1.2-0.50.41.21.71.7

Weather Map and Satellite Images
       (on/off)   Help
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 (4,6,7,8)
      (on/off)   Help

Ground Weather Radar Station San Francisco Bay Area, CA
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.