Thursday, January18, 2018 L-36.com


Marine Weather and Tides
Colma, 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 7:20AMSunset 5:19PM Wednesday January 17, 2018 9:36 PM PST (05:36 UTC) Moonrise 7:44AMMoonset 6:07PM Illumination 2% Phase: Waxing Crescent; 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
PZZ531 San Francisco Bay South Of The Bay Bridge- 837 Pm Pst Wed Jan 17 2018
Tonight..NW winds 5 to 15 kt...becoming southeast after midnight.
Thu..S winds 5 to 15 kt. Chance of rain.
Thu night..W winds 5 to 15 kt. Chance of rain in the evening, then chance of showers after midnight.
Fri..W winds 5 to 15 kt. Chance of showers.
Fri night..NW winds 10 to 20 kt. Slight chance of showers in the evening.
Sat..W winds 10 kt.
Sun..SE winds 5 kt...becoming S 5 to 15 kt. Chance of rain, then rain likely.
Mon..SW winds 5 kt...becoming nw. Chance of showers.
PZZ500 837 Pm Pst Wed Jan 17 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A large long period westerly swell generated by a strong low pressure system currently off the pacific northwest coast will impact the coastal waters beginning tonight and continuing through the end of the week. This swell will bring hazardous seas to the region as well as large breaking waves to the coastline through Friday.

7 Day Forecast for Marine Location Near Colma, CA
   Hourly   EDIT   Help
location: 37.68, -122.42     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kmtr 180515
afdmtr
area forecast discussion
national weather service san francisco bay area
915 pm pst Wed jan 17 2018

Synopsis A weather system approaching form the northwest will
spread rain across the north bay late tonight and Thursday morning
and then southward across the remainder of the forecast area by
Thursday evening. Showers are forecast for Thursday night and Friday
as much colder air settles over the region. A few showers may
linger into Saturday morning, but for the most part Saturday
should be a dry day. The next front will bring rain chances late
Sunday into Monday.

Discussion As of 9:15 pm pst Wednesday... IR satellite imagery
shows a cold frontal boundary approaching the northern california
coast this evening. Latest hrrr and NAM models both forecast light
rain to begin spreading into northwest sonoma county shortly after
midnight tonight, and then develop across much of the north bay
by the morning commute. Rain is then forecast to develop in san
francisco by late morning, across the rest of the sf bay area by
mid-afternoon, and then into the monterey bay area by late
afternoon. Rain is expected to change to scattered showers by
Thursday evening. Both the 00z NAM and 00z GFS then forecast
little additional rainfall from late Thursday evening through
about sunrise Friday. Rainfall amounts through Thursday night are
expected to be light in most areas, generally less than a quarter
of and inch. The exception is northern sonoma county which is
forecast to pick up between a half inch and an inch of rain,
according to the latest nam.

Scattered showers are expected to redevelop on Friday morning as
the cold upper trough approaches from the northwest. Showers will
then taper off Friday afternoon and evening. The incoming system
will usher a much colder airmass into our area from late tomorrow
through Friday. 850 mb temperatures are forecast to drop from
about 13 deg c at the present time to -2 deg c by Friday morning.

Snow levels will drop as low as 3000 on Friday, but precipitation
will be light and scattered by then, so no more than a dusting of
snow is expected on higher peaks. Isolated thunder is possible
late Thursday night and Friday, mainly over our northern coastal
waters.

Isolated showers may linger into Saturday morning, but for the
most part Saturday should be a dry and cool day as the upper
trough moves off to our southeast and weak shortwave ridging
develops along the california coast. Based on latest model data,
most of Sunday should be dry as well.

The next system arriving from the northwest is expected to spread
rain across our region from late Sunday through early Monday. This
system will move through quickly and is also expected to generate
only light rainfall amounts, except locally moderate in the north
bay.

Yet another fast-moving system is forecast to arrive from the
northwest around the middle of next week.

Aviation (issued by WFO eureka) as of 2:00 pm pst Wednesday... All bay
area terminals showing subtle improvement from this mornings fog and stratus
induced reduction of vsbys and cigs. However the north bay and sfo still
plagued by mfvr conditions with no immediate relief expected but still an
improvement from what was observed earlier this morning. Some challenging
changes expected later this evening and overnight as a weak cold front slowly
migrates across the bay area. Have slowed the timing of rainfall from earlier
forecasts to early Thursday morning for the north bay to late Thursday morning
for oak and sfo. While terminals farther south should not see any significant
rain till thurs afternoon. Challenge is whether low stratus and fog will
redevelop tonight since mid to high cloud cover should be a mitigating factor.

Also, some pre-frontal mixing should aid in maintaining somewhat higher CIGS than
what was observed last night and early this morning. Thus have hedged the next
taf cycle in a more MVFR direction for all sites and only a slight reduction
of vsbys associated with the rainfall. Winds look to remain quite light.

Vicinity of ksfo... MVFR through 22z with vsbys down to 4-6 miles in haze.

At times.

Sfo bridge approach... Similar to ksfo.

Marine As of 8:37 pm pst Wednesday... A large long period
westerly swell generated by a strong low pressure system currently
off the pacific northwest coast will impact the coastal waters
beginning tonight and continuing through the end of the week. This
swell will bring hazardous seas to the region as well as large
breaking waves to the coastline through Friday.

Mtr watches warnings advisories
Tngt High surf warning... Entire coast
sca... Mry bay from 3 am
sca... Pigeon pt to pt pinos 0-10 nm from 3 am
sca... Pt arena to pigeon pt 10-60 nm from 10 pm
sca... Pigeon pt to pt piedras blancas 10-60 nm from 3 am
sca... Pt arena to pt reyes 0-10 nm from 12 am
sca... Rough bar advisory for sf bar
sca... Pt reyes to pigeon pt 0-10 nm from 3 am
public forecast: dykema
aviation: W pi
marine: cw
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
PXOC1 - 9414311 - San Francisco (Pier 1), CA 8 mi48 min NNW 8.9 G 11 52°F 1020.6 hPa
FTPC1 - 9414290 - San Francisco, CA 9 mi48 min N 8.9 G 9.9 54°F1021.9 hPa
PXSC1 9 mi54 min 53°F 53°F
AAMC1 - 9414750 - Alameda, CA 9 mi54 min N 6 G 12 53°F 55°F1021.6 hPa
OBXC1 10 mi48 min 53°F 53°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 10 mi48 min NNW 7 G 8.9 53°F 1021.6 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 10 mi48 min NNW 7 G 11
LNDC1 11 mi54 min N 5.1 G 8 54°F 1021.5 hPa
46237 - San Francisco Bar, CA (142) 14 mi66 min 54°F8 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 15 mi47 min NNW 7 52°F 1022 hPa (-1.0)
RTYC1 - 9414523 - Redwood City, CA 16 mi48 min WNW 2.9 G 5.1 52°F 56°F1021.9 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 16 mi54 min N 5.1 G 7 55°F 1021.7 hPa
RCMC1 - 9414863 - Richmond, CA 17 mi48 min NNW 6 G 8 54°F1021.3 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 23 mi46 min ESE 5.8 G 9.7 51°F 55°F7 ft1021.1 hPa (-1.2)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 27 mi48 min E 7 G 7 52°F 1021.5 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi48 min N 2.9 G 4.1 52°F 52°F1022.1 hPa52°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 33 mi46 min SW 3.9 G 3.9 56°F 57°F9 ft1021 hPa (-1.0)
PCOC1 - 9415144 - Port Chicago, CA 33 mi48 min NNW 6 G 6 52°F 52°F1021.8 hPa
PRYC1 - 9415020 - Point Reyes, CA 37 mi48 min SSW 2.9 G 4.1 55°F1020.8 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 38 mi48 min SSW 1.9 G 4.1 54°F 1021.6 hPa
SFXC1 - San Francisco Bay Reserve, CA 42 mi111 min SE 2.9 52°F 1021 hPa

Wind History for Alameda, CA
(wind in knots)    EDIT      (on/off)   Help
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
NW2
NW2
SW2
NW3
N2
--
E1
SW2
E3
--
N1
W3
W3
W6
NW3
G8
NW4
W4
W4
NW3
N4
G8
N7
G10
N6
NW4
G7
N6
1 day
ago
N4
NW4
N2
S1
E3
SE1
SE1
NW1
NW1
NW2
N4
N5
N3
G8
NW3
N5
N6
NW4
G7
NW2
NW2
NW4
N4
NW3
NW1
NW2
2 days
ago
NW3
N6
NW3
N2
N5
NW3
N4
NW3
W3
SW2
W7
N2
N4
N4
NE1
N3
N4

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA5 mi40 minNNW 56.00 miFog/Mist54°F51°F90%1021.5 hPa
Oakland, Metro Oakland International Airport, CA11 mi43 minN 61.00 miFog/Mist53°F53°F100%1021.7 hPa
Half Moon Bay Airport, CA12 mi41 minN 09.00 miFair46°F46°F100%1020.7 hPa
San Carlos Airport, CA14 mi49 minN 03.00 miFog/Mist54°F53°F100%1021.7 hPa
Hayward, Hayward Air Terminal, CA16 mi42 minNNW 53.00 miFog/Mist53°F48°F86%1022.5 hPa
Palo Alto Airport, CA21 mi2.8 hrsWNW 76.00 miMostly Cloudy with Haze55°F53°F94%1021.7 hPa

Wind History from SFO (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 24hrNE5NE3CalmN3N6N4N3CalmE3SE5E4CalmCalmCalmNE4E6N4E4NE4N7N6N6S3N5
1 day agoNE4SE3E4CalmSE6SW3E3CalmCalmCalmNE4NE5N5N5NE5N7N10N7N4N5NE9N5NE5Calm
2 days agoSW4N5CalmCalmS3SE3SW3W3NE8N9S5CalmN5NE8NE4N5NE3NW5E5N3N3E4SE3E4

Tide / Current Tables for South San Francisco, San Francisco Bay, California
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
South San Francisco
Click for Map
Thu -- 01:45 AM PST     6.07 feet High Tide
Thu -- 06:44 AM PST     2.90 feet Low Tide
Thu -- 07:22 AM PST     Sunrise
Thu -- 08:22 AM PST     Moonrise
Thu -- 12:22 PM PST     7.15 feet High Tide
Thu -- 05:18 PM PST     Sunset
Thu -- 07:02 PM PST     Moonset
Thu -- 07:21 PM PST     -0.34 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.15.96.15.64.73.73.12.93.44.35.46.57.176.34.93.21.60.3-0.3-0.20.61.83.2

Tide / Current Tables for Sierra Point 1.3 mi ENE, South San Francisco Bay, California Current
   EDIT      (on/off)   Help   One Week of Data
Sierra Point 1.3 mi ENE
Click for Map
Thu -- 01:53 AM PST     -0.00 knots Slack
Thu -- 04:18 AM PST     -0.66 knots Max Ebb
Thu -- 07:00 AM PST     0.00 knots Slack
Thu -- 07:22 AM PST     Sunrise
Thu -- 08:22 AM PST     Moonrise
Thu -- 10:00 AM PST     0.72 knots Max Flood
Thu -- 12:51 PM PST     -0.01 knots Slack
Thu -- 04:26 PM PST     -1.35 knots Max Ebb
Thu -- 05:17 PM PST     Sunset
Thu -- 07:02 PM PST     Moonset
Thu -- 07:50 PM PST     0.00 knots Slack
Thu -- 10:58 PM PST     1.00 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.80.4-0.1-0.5-0.7-0.6-0.300.30.60.70.60.3-0.1-0.6-1-1.3-1.3-0.9-0.50.10.50.91

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 (0,6,7,8)
      (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.