Thursday, September21, 2017 L-36.com


Marine Weather and Tides
Millbrae, 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 6:56AMSunset 7:07PM Thursday September 21, 2017 6:54 AM PDT (13:54 UTC) Moonrise 7:21AMMoonset 7:20PM Illumination 1% Phase: New Moon; Moon at 1 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- 225 Am Pdt Thu Sep 21 2017
.small craft advisory in effect through this evening...
Today..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 4 to 6 ft at 11 seconds.
Tonight..NW winds 15 to 25 kt. Wind waves 4 to 6 ft. NW swell 4 to 6 ft at 10 seconds.
Fri..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 4 to 6 ft at 10 seconds.
Fri night..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 4 to 6 ft at 10 seconds.
Sat..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 3 to 5 ft at 10 seconds.
Sun..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 4 ft.
Mon..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 4 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 5 to 7 ft with a dominant swell period 12 seconds...decreasing to 4 to 6 feet at 10 seconds overnight. Across the bar...combined seas 5 to 7 ft with a dominant swell period of 12 seconds...decreasing to 10 seconds overnight. Maximum ebb current of 1.5 knots at 04:00 am Thursday and 1.5 knots at 04:48 pm Thursday.
PZZ500 225 Am Pdt Thu Sep 21 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Increasing northwesterly winds will continue across the coastal waters today behind a cold front that moved through the region on Wednesday. Moderate northwest swell will continue through the rest of the week and into the weekend.

7 Day Forecast for Marine Location Near Millbrae, CA
   Hourly   EDIT   Help
location: 37.58, -122.39     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kmtr 211136
afdmtr
area forecast discussion
national weather service san francisco bay area
436 am pdt Thu sep 21 2017

Synopsis A cool, upper level trough will dominate the western
portion of the country through the workweek maintaining cooler
than average temperatures and breezy conditions. Aside from the
potential for isolated showers offshore or near the coast Thursday,
dry weather conditions will prevail. A gradual warming trend is
then expected to begin this weekend and persist into early next
week.

Discussion As of 2:45 am pdt Thursday... A cold front passed
through the bay area on Wednesday bringing some light showers,
breezy conditions and cooler temperatures. The cold front is now
south of the forecast area, but continues to produce precipitation
across the sierra. Behind the front and rather robust upper level
trough is currently swinging through norcal. Latest satellite
imagery and radar both indicate showers over the coastal waters.

These showers are tracking mostly north to south. Model guidance
has not changed too much from previous runs regarding the shower
activity. Showers will continue early today, but remain offshore
with no impact to the land areas of the bay area region.

Do expect some clearing of clouds today, but temperatures will
remain cool as the upper trough moves through. Latest model runs
still show a cool airmass with 850mb temps in the 4-5 deg c range.

As a result, daytime highs will be in the 60s and 70s or about 5
to 10 deg below normal for late september. Overnight lows will be
chilly as well with the hills dropping into the upper 30s.

Additionally, hi-res models show some breezy winds today and
Friday. Gusts 30 to 40 mph along the coast and higher terrain
seems plausible.

Another pattern shift is forecast to develop this weekend and then
persisting into next week. In the wake of the upper trough high
pressure will build over the region this weekend. A noticeable
warming trend is forecast to develop this weekend and peak next
week. Widespread 80s to possibly mid 90s will be possible by early
next week. Pattern recognition and climatology also suggest
periods of north to offshore winds will possible this weekend and
next week. The offshore flow will further enhance any warming and
drying. Fire weather concerns may increase due to offshore flow
with hot and dry conditions.

Aviation As of 04:35 am pdt Thursday for 12z tafs... Currently
vfr conditions at all sites with some cloud development around
kmry currently showing on satellite imagery. Gusty winds are
expected to continue throughout the day before decreasing late
tonight.

Vicinity of ksfo...VFR conditions will prevail through tonight.

Gusts up to 29 kt were observed overnight along with periods of
sustained winds at 20 kt. Expecting similar windy conditions until
tonight.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Some low cloud development around kmry
this morning. Confidence is low as to how long the clouds will
remain around the airport. Breezy onshore flow is expected today
at kmry and ksns with gusts up to 20 kt possible this afternoon.

Marine As of 02:25 am pdt Thursday... Increasing northwesterly
winds will continue across the coastal waters today behind a cold
front that moved through the region on Wednesday. Moderate
northwest swell will continue through the rest of the week and
into the weekend.

Mtr watches warnings advisories
Tday 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... Pigeon pt to pt piedras blancas 10-60 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Mry bay from 8 am
sca... Sf bay from 1 pm
public forecast: mm
aviation: as
marine: as
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 11 mi67 min W 13 G 18 58°F 70°F1010.9 hPa
AAMC1 - 9414750 - Alameda, CA 14 mi67 min W 6 G 8.9 59°F 68°F1011.4 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi79 min WSW 4.1 G 7 58°F 1010 hPa
PXSC1 15 mi67 min 59°F 47°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi67 min NNW 5.1 G 8 60°F 1011 hPa
OBXC1 16 mi67 min 60°F 47°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 16 mi67 min NW 6 G 9.9
FTPC1 - 9414290 - San Francisco, CA 16 mi73 min W 6 G 8.9 58°F 62°F1011.4 hPa
LNDC1 16 mi67 min NW 4.1 G 8.9 60°F 1010.9 hPa
46237 - San Francisco Bar, CA (142) 19 mi85 min 59°F5 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 22 mi73 min NW 7 58°F 1011 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 23 mi67 min W 9.9 G 13 59°F 1011 hPa
RCMC1 - 9414863 - Richmond, CA 24 mi67 min NW 11 G 16 58°F 65°F1010.7 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 27 mi65 min NW 19 G 23 57°F 56°F6 ft1011.3 hPa (-0.9)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 30 mi65 min NW 18 G 21 60°F 62°F7 ft1011.5 hPa (-0.4)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 34 mi67 min NW 11 G 12 58°F 1010.6 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi67 min W 14 G 18 58°F 68°F1010.8 hPa49°F
PCOC1 - 9415144 - Port Chicago, CA 38 mi67 min SW 8.9 G 13 56°F 68°F1010.6 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 41 mi67 min W 6 G 8.9 57°F 1010.3 hPa
PRYC1 - 9415020 - Point Reyes, CA 42 mi67 min W 17 G 22 61°F 55°F1011.2 hPa
SFXC1 - San Francisco Bay Reserve, CA 47 mi130 min NW 6 52°F 1010 hPa47°F

Wind History for Redwood City, CA
(wind in knots)    EDIT      (on/off)   Help
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
1
AM
2
AM
3
AM
4
AM
5
AM
Last
24hr
NW6
G10
NW3
N1
SE4
N1
NE4
E4
W9
SW11
G17
W12
W13
G16
SW14
W10
G15
W7
G11
W10
W11
W11
W12
G15
NW13
G16
W11
G17
W13
G16
W12
W14
G19
W13
G16
1 day
ago
W12
G15
NW6
NW8
W8
NW5
G9
NW6
G11
NW5
G10
NW7
G11
NW8
G12
NW10
G13
W12
G16
W14
G19
W17
G22
W15
W10
G14
W10
G13
NW9
SW4
SW1
SW2
S2
SE2
W7
W10
G16
2 days
ago
SW6
S1
SW3
SW3
N4
W8
G11
W11
G14
W12
SW16
SW8
G12
NW14
G17
NW11
G14
SW13
G16
W14
G17
W13
G16
W16
W12
G18
W16
G24
W10
G14
W14
W13
G18
W12
G16
NW13
W15

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA3 mi2 hrsW 1410.00 miFair57°F48°F72%1011.3 hPa
Half Moon Bay Airport, CA8 mi60 minNNW 119.00 miFair57°F0°F%1010.8 hPa
San Carlos Airport, CA8 mi60 minW 9 G 1510.00 miFair57°F48°F72%1011.8 hPa
Oakland, Metro Oakland International Airport, CA12 mi62 minW 1310.00 miFair58°F48°F70%1010.8 hPa
Hayward, Hayward Air Terminal, CA15 mi61 minNW 310.00 miFair57°F45°F64%1011.9 hPa
Mountain View, Moffett Field, CA21 mi2 hrsWSW 610.00 miFair58°F46°F67%1012 hPa

Wind History from SFO (wind in knots)
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
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
Last 24hrNW4NW3W8W9W11W10W12W11W16W16W17
G23
W15W14
G18
W14W16W12W18W16W16W16
G22
W19
G29
W16W14W13
1 day agoW12NW7W10W8W5NE3W11W15W15W16
G22
W19
G27
W22
G30
W21W20W18W15W13W10W10W9NW7W8NW7W7
2 days agoW11W10W7
G15
W9SW12
G18
W21W11W13W12W18
G24
W16
G21
W17W14
G24
W17
G27
W15
G22
W17W18W18W17W18NW12W18
G25
W15W12

Tide / Current Tables for Coyote Point Marina, San Francisco Bay, California
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Coyote Point Marina
Click for Map
Thu -- 01:33 AM PDT     7.35 feet High Tide
Thu -- 06:56 AM PDT     Sunrise
Thu -- 07:47 AM PDT     0.55 feet Low Tide
Thu -- 08:19 AM PDT     Moonrise
Thu -- 02:01 PM PDT     7.47 feet High Tide
Thu -- 07:07 PM PDT     Sunset
Thu -- 08:12 PM PDT     0.69 feet Low Tide
Thu -- 08:19 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.37.27.36.453.41.90.80.61.22.54.25.877.575.84.22.61.30.7123.5

Tide / Current Tables for Oyster Point 2.8 mi E, South San Francisco Bay, California Current
   EDIT      (on/off)   Help   One Week of Data
Oyster Point 2.8 mi E
Click for Map
Thu -- 02:03 AM PDT     -0.00 knots Slack
Thu -- 05:18 AM PDT     -1.64 knots Max Ebb
Thu -- 06:56 AM PDT     Sunrise
Thu -- 08:19 AM PDT     Moonrise
Thu -- 08:20 AM PDT     0.01 knots Slack
Thu -- 11:18 AM PDT     1.09 knots Max Flood
Thu -- 02:22 PM PDT     -0.00 knots Slack
Thu -- 05:38 PM PDT     -1.64 knots Max Ebb
Thu -- 07:07 PM PDT     Sunset
Thu -- 08:19 PM PDT     Moonset
Thu -- 08:41 PM PDT     0.00 knots Slack
Thu -- 11:41 PM PDT     1.09 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
10.60-0.7-1.4-1.6-1.5-1.1-0.30.40.91.110.80.2-0.5-1.2-1.6-1.6-1.2-0.60.20.71

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 (9,2,3,4)
      (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.