Monday, December18, 2017 L-36.com


Marine Weather and Tides
Ladera, 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 7:17AMSunset 4:54PM Monday December 18, 2017 1:05 AM PST (09:05 UTC) Moonrise 7:28AMMoonset 5:38PM Illumination 0% Phase: New Moon; Moon at 0 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
PZZ530 San Pablo Bay Suisun Bay The West Delta And San Francisco Bay North Of The Bay Bridge- 831 Pm Pst Sun Dec 17 2017
Tonight..E winds 10 kt.
Mon..NE winds 10 kt.
Mon night..NE winds 10 kt.
Tue..SE winds 5 to 15 kt.
Tue night..SW winds 10 to 20 kt. Slight chance of rain after midnight.
Wed..W winds 10 to 20 kt...becoming nw 10 kt. Chance of rain.
Thu..NW winds 10 kt.
Fri..NE winds 5 to 15 kt...becoming sw.
PZZ500 831 Pm Pst Sun Dec 17 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Surface high pressure 650 miles west of the bay area will gradually move southeast and weaken through early week. As a result winds will diminish tonight and remain mainly light Monday into Tuesday. South to southwest winds Tuesday precede the arrival of a moderate cold front Tuesday evening and early Wednesday morning. Modified arctic air and high pressure will build over the eastern pacific and extend into the intermountain west. Post cold frontal northwest winds will become gusty over the coastal waters and bays mid to late this week. A dry cold front will usher in a reinforcement of modified arctic air from the north and northeast beginning Saturday evening and continuing into early next week.

7 Day Forecast for Marine Location Near Ladera, CA
   Hourly   EDIT   Help
location: 37.4, -122.21     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kmtr 180645
afdmtr
area forecast discussion
national weather service san francisco bay area
1045 pm pst Sun dec 17 2017

Synopsis Dry and quiet weather Monday and Tuesday with
seasonable temperatures. A fast moving cold front will arrive
Wednesday morning with a quick shot of light rain for the morning
commute. Dry but cool and breezy at times weather returns
Wednesday afternoon through christmas eve.

Discussion As of 9:52 pm pst Sunday... No need for short term
updates tonight with mostly clear skies overhead. Offshore winds
in the hills continue to ease with temperatures now falling into
the 40s. Dewpoints are in the 30s and with lighter winds expect
widespread readings into the 30s by morning for the interior
valleys.

Monday will be another sunny and seasonably mild december
afternoon with highs back in the 60s. On Tuesday winds will turn
onshore which will lead to a few degrees of cooling ahead of an
incoming weather system as high clouds increase by Tuesday
afternoon.

Minor forecast updates were completed for the late Tuesday night
into weds morning time frame. 00z NAM and GFS guidance are in and
continue to trend wetter (in a relative sense). Scenario is
currently looking like a high pop low QPF scenario. Latest nam
solutions now show 0.20 and perhaps upwards of a quarter inch for
the north bay with a tenth or two for the greater bay area and
then lesser amounts rain shadowed interior valleys and central
coast.

System should be out of the area by weds afternoon but leaving
cool and blustery winds in its wake. High pressure to rebuild
Thursday through the upcoming holiday weekend.

Prev discussion As of 1:32 pm pst Sunday... Temperatures are
rebounding nicely after a cool december morning across the san
francisco bay area and central california coast. Temperature
observations this early afternoon are generally in the 60s with
dewpoints in the upper teens to 30s as the airmass remains dry.

Preliminary and non-operational goes-16 (tentatively scheduled to
become operational as goes-east this week) shows mostly clear
skies across the state as an upper level low continues to move
east along the arizona mexico border and an upper level ridge
builds over the eastern pacific.

In the short-term low relative humidity values and locally breezy
conditions will continue, particularly in the higher elevations.

While some locations in the north bay hills and east bay hills are
still reporting sustained winds over 20 mph, expect these winds
to continue to subside through the afternoon hours. Because the
elevated wind speeds are no longer widespread and are primarily
confined to the ridgetops and peaks, the wind advisory was allowed
to expire earlier as scheduled at 10 am pst.

The red flag warning that was issued earlier for the higher
elevations across the area was also allowed to expire at 10 am
pst. Though the humidity values will drop to 25 percent or less in
many elevated areas, the diminishing winds are what helped to
improve the fire weather conditions from "critical" to "near-
critical". That being said -- fuels still remain abnormally dry
for middle december.

The upper level ridge will begin to flatten late Monday and
Tuesday as an upper level low drops southeastward from the gulf of
alaska to the pacific northwest. The gfs, ecmwf, and canadian
models remain optimistic that parts of northern california will
receive light amounts of precipitation from late Tuesday and into
Wednesday. The big questions at this point are 1) what exact track
will the upper low take, and 2) how far south will this moisture
make it? As witnessed earlier this season, the north bay is
typically the favored location to receiving the most (if any)
rainfall. Models have trended marginally wetter over the past day,
so we'll wait and see what the 00z model runs advertise. While
rain amounts are expected to remain rather limited, any moisture
at this time would be much welcomed.

Heading into Friday and beyond, models are advertising a high-
amplitude ridge in the eastern pacific with dry weather for much
of california. Climatology tells us that december is normally the
wettest month of the year for san francisco (4.56" according to
the 1981-2010 normals). As it stands right now, downtown san
francisco has observed only 0.02" of rain so far this month. With
records going back to 1850, the first 17 days of this month mark
the 7th driest start to december on record for san francisco, and
the driest since 1989. With the climate prediction center's 8 to
14 day outlook now valid through the last day of 2017, confidence
remains fairly high that this month will conclude drier than normal.

Aviation As of 10:45 pm pst Sunday... Light offshore flow, dry
conditions supportVFR tonight and Monday. However, air temperatures
are cooler and dewpoint temperatures are higher per 24 hour trends.

Thus nocturnal cooling combining with a light mixing wind may produce
a few patches of valley fog tonight. Statistical guidance for ksts
does indicate fog development tonight, not indicated in TAF for now,
but will monitor and amend if needed overnight. Any patchy valley fog
early Monday should mix out quickly in the morning.

Late Monday night and Tuesday morning offshore pressure gradients and
winds become neutral to onshore. Increasingly milder maritime weather
influence including low clouds are quite likely Tuesday. A cold front
and rain band will be moving southeast over the area Tuesday night.

Vicinity of ksfo...VFR. Light winds.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR. E-se winds near 5 knots tonight except
near 10 knots in the salinas valley. Winds becoming light variable
late Monday afternoon.

Marine As of 9:35 pm pst Sunday... Surface high pressure 650
miles west of the bay area will gradually move southeast and
weaken through early week. As a result winds will diminish tonight
and remain mainly light Monday into Tuesday. South to southwest
winds Tuesday precede the arrival of a moderate cold front Tuesday
evening and early Wednesday morning. Modified arctic air and high
pressure will build over the eastern pacific and extend into the
intermountain west. Post cold frontal northwest winds will become
gusty over the coastal waters and bays mid to late this week. A
dry cold front will usher in a reinforcement of modified arctic
air from the north and northeast beginning Saturday evening and
continuing into early next week.

Mtr watches warnings advisories
Tngt None.

Public forecast: rww
aviation marine: canepa
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 7 mi48 min SSW 2.9 G 2.9 49°F 53°F1020.3 hPa
AAMC1 - 9414750 - Alameda, CA 26 mi54 min ESE 1.9 G 1.9 50°F 53°F1020 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 28 mi48 min NNW 8 G 9.9
LNDC1 28 mi48 min Calm G 2.9 50°F 1019.9 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 29 mi48 min W 4.1 G 5.1 52°F 1018.9 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 29 mi48 min NNW 6 G 8 52°F 1019.9 hPa
OBXC1 29 mi48 min 52°F 43°F
PXSC1 30 mi48 min 54°F 40°F
FTPC1 - 9414290 - San Francisco, CA 31 mi54 min SSW 1.9 G 4.1 51°F 54°F1020.3 hPa
46237 - San Francisco Bar, CA (142) 35 mi66 min 53°F4 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 36 mi52 min W 5.1 51°F 1020 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 36 mi76 min NW 7.8 G 9.7 56°F 57°F5 ft1019.2 hPa (+0.9)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 36 mi48 min NNW 9.9 G 12 51°F 1020.3 hPa
RCMC1 - 9414863 - Richmond, CA 38 mi54 min NW 11 G 13 51°F 53°F1019.8 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 41 mi76 min NE 1.9 G 3.9 54°F 55°F6 ft1019.7 hPa (+0.8)
MZXC1 - 9415102 - Martinez-Amorco CA 44 mi48 min SSE 1 G 1.9 46°F 52°F1020.5 hPa39°F
46042 - MONTEREY - 27NM West of Monterey Bay, CA 44 mi76 min N 7.8 G 9.7 56°F 57°F5 ft1019.1 hPa (+1.1)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 45 mi48 min ENE 2.9 G 5.1 49°F 1020.2 hPa
46092 - MBM1 46 mi56 min NE 9.7 54°F 57°F1019.1 hPa (+0.9)
PCOC1 - 9415144 - Port Chicago, CA 46 mi48 min NNW 1 G 2.9 47°F 51°F1020.3 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 47 mi48 min WSW 1 G 1.9 45°F 1020.4 hPa
46114 - West Monterey Bay, CA 47 mi36 min 57°F6 ft
ELXC1 - Elkhorn Slough Reserve, CA 48 mi81 min NE 1.9 47°F 1019 hPa28°F

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
NW5
W7
NW3
S2
SW3
E2
W1
SE2
S5
SE3
SE3
E2
W4
W2
E1
G4
N4
NW1
SW1
W1
NW1
E2
SW1
SW2
SW1
1 day
ago
W2
W2
W4
NW8
W6
W8
NW6
NW9
NW17
NW19
G24
NW24
G32
NW25
G31
NW24
G29
NW23
NW20
G25
NW9
G14
NW12
NW7
NW15
G19
NW19
G24
NW14
G17
NW10
NW6
NW7
G10
2 days
ago
E1
S2
S2
--
--
E3
NE2
N2
N7
N3
N3
N3
NW4
--
S2
W2
E2
SW1
SW2
NE1

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Palo Alto Airport, CA7 mi4.3 hrsN 010.00 miClear46°F33°F62%1019 hPa
San Carlos Airport, CA9 mi71 minN 010.00 miFair46°F30°F53%1020 hPa
Mountain View, Moffett Field, CA9 mi70 minN 010.00 miFair45°F30°F58%1020.4 hPa
San Jose, San Jose International Airport, CA15 mi73 minE 410.00 miFair48°F28°F46%1019.9 hPa
San Francisco, San Francisco International Airport, CA17 mi70 minSSW 310.00 miFair48°F34°F58%1019.9 hPa
Half Moon Bay Airport, CA17 mi71 minN 010.00 miFair39°F32°F75%1018.6 hPa
Hayward, Hayward Air Terminal, CA19 mi72 minNE 510.00 miFair46°F27°F47%1020.8 hPa
San Jose / Reid / Hillv, CA21 mi3.2 hrsVar 610.00 miPartly Cloudy46°F26°F46%1019 hPa
Oakland, Metro Oakland International Airport, CA21 mi73 minN 010.00 miA Few Clouds42°F35°F76%1020 hPa

Wind History from PAO (wind in knots)
10
PM
11
PM
12
AM
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
Last 24hr------------------Calm--NE9E9E6SE7CalmSE8----4--CalmCalmCalm
1 day ago--------------------NW10NW15NW21--NW22
G28
NW20
G30
NW25
G33
NW18
G23
NW15NW15
G23
--NW14--Calm
2 days ago------------------CalmCalm----44--NW7N5N5NW6NW6CalmCalmCalm

Tide / Current Tables for Redwood City, Wharf 5, San Francisco Bay, California (sub)
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Redwood City
Click for Map
Mon -- 01:10 AM PST     6.82 feet High Tide
Mon -- 06:08 AM PST     2.97 feet Low Tide
Mon -- 07:18 AM PST     Sunrise
Mon -- 07:27 AM PST     Moonrise
Mon -- 11:40 AM PST     8.74 feet High Tide
Mon -- 04:52 PM PST     Sunset
Mon -- 05:37 PM PST     Moonset
Mon -- 06:55 PM PST     -0.55 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.36.86.55.64.43.433.34.45.97.48.58.78.16.74.82.70.9-0.2-0.5-01.12.64.3

Tide / Current Tables for Dumbarton Point 2.3 mi NE, South San Francisco Bay, California Current
   EDIT      (on/off)   Help   One Week of Data
Dumbarton Point 2.3 mi NE
Click for Map
Mon -- 01:24 AM PST     -0.00 knots Slack
Mon -- 05:00 AM PST     -0.62 knots Max Ebb
Mon -- 07:08 AM PST     0.00 knots Slack
Mon -- 07:17 AM PST     Sunrise
Mon -- 07:27 AM PST     Moonrise
Mon -- 09:34 AM PST     0.96 knots Max Flood
Mon -- 12:23 PM PST     -0.00 knots Slack
Mon -- 04:52 PM PST     Sunset
Mon -- 05:06 PM PST     -1.36 knots Max Ebb
Mon -- 05:36 PM PST     Moonset
Mon -- 07:57 PM PST     0.01 knots Slack
Mon -- 10:43 PM PST     1.38 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.90.3-0.2-0.4-0.6-0.6-0.5-0.10.50.90.90.70.2-0.2-0.6-1-1.3-1.4-1.2-0.700.81.31.4

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.