Monday, August21, 2017 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 6:29AMSunset 7:55PM Sunday August 20, 2017 9:38 PM PDT (04:38 UTC) Moonrise 4:14AMMoonset 6:23PM Illumination 1% Phase: Waning Crescent; 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
PZZ530 San Pablo Bay Suisun Bay The West Delta And San Francisco Bay North Of The Bay Bridge- 824 Pm Pdt Sun Aug 20 2017
.small craft advisory in effect until 9 pm pdt this evening...
Tonight..SW winds 15 to 25 kt. Patchy fog after midnight.
Mon..SW winds 10 to 20 kt. Patchy fog in the morning.
Mon night..SW winds 10 to 20 kt. Patchy fog after midnight.
Tue..SW winds 10 to 20 kt. Patchy fog in the morning.
Tue night..SW winds 10 to 20 kt.
Wed..SW winds 15 to 25 kt.
Thu..SW winds 10 kt.
Fri..SW winds 10 kt.
PZZ500 824 Pm Pdt Sun Aug 20 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds over the outer coastal waters will continue to subside this evening and overnight. Breezy from the golden gate bridge to angel island will dissipate later this evening. Winds are forecast to remain generally light for both Monday and Tuesday.

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 210331
afdmtr
area forecast discussion
national weather service san francisco bay area
831 pm pdt Sun aug 20 2017

Synopsis Cooling will continue early this week as an upper
trough of low pressure becomes nearly stationary over the eastern
pacific. Coastal areas will see little in the way of change with
continued night and morning low clouds and patchy fog.

Discussion As of 08:23 pm pdt Sunday... The forecast remains on
track. The evening update only included some minor tweaks to temps
and sky. The most significant of the minor tweaks were to the sky
cover over the east bay this evening and tonight. Instead of
clear, they have been made partly cloudy. This is a result of the
easterly flow aloft and the storms over the sierras today. Some of
the blow off is heading toward east bay which necessitated an
increase in cloud cover for the night. Looking at the convective
parameters, it looks like all the energy has been used up and
should not pose any threat of rain or lightning for the area. That
said, we are 24 7 365 and watch the radar when anything is
happening in our neighboring areas. If what is forecast changes,
we will be on it. Have a great night and enjoy our partial eclipse
tomorrow. Be eye safe, don't stare at the sun.

Prev discussion As of 2:00 pm pdt Sunday... Clouds have burned-off
from most of our CWA although still have a few patches near and
along the coast. Temperatures have been running close to
yeterday's numbers with most locations in the 60s and 70s at the
coast with 70s and 80s inland. Satellite shows widspread clouds
off the coast, and with the marine layer still over 2000 feet plus
the onshore gradient still around 2 mb west-to-east clouds will
return back to most of the same locations overnight.

For those planning on watching the eclipse (remember to get the
correct lenses) tomorrow morning, still looks like the farther
inland you are the better shot at seeing it starting at 9 am. The
big question remains how quickly the clouds will dissipate through
the morning hours. Feeling right now is the south bay through
santa clara valley will see mostly clear conditions around the
start while farther to the north stretching from san francisco to
oakland there will likely be clouds at first. However, the hope if
they will dissipate during the hour with good viewing before the
peak time. Most of our coastal locations will likely remain cloudy
all morning.

Outside of the eclipse, not much to talk about as we are going to
continue to see overnight clouds, clearing during the day, and
temperatures remaining cool the first part of the week followed by
a modest warming trend going into the weekend as a ridge of high
pressure rebuilds into our region. No chance of rain.

Aviation As of 4:47 pm pdt Sunday... A weak surface low 120 miles
west of santa cruz tilts southward with height to a mid level nearly
stationary and dry closed low near the channel islands. This low is
producing a solid southerly wind component through the stratus field
while an onshore pressure gradient from sfo-sac is present at 2.6 mb.

Wildfire smoke entrained into this low pressure circulation continues
to be present aloft. Convection along the sierra nevada will eventually
transform into mid level cloud debris drifting westward over the area
tonight. In all, it's a difficult TAF forecast package, but thinking
is that the stratus will reach into the north bay a little more quickly
than it does over to the east bay and south bay areas including the
bay side of the sf peninsula. Stratus will prob wrap around to ksns
earlier than it reaches kmry this evening.

Warming 925 mb level temperatures results in reinforcement and possibly
some compression of the marine layer depth tonight, thus ifr CIGS and
vsbys becoming increasingly likely tonight into Monday morning.VFR
should return by mid-late Monday morning with the last places to clear
out being the north bay and along the immediate coast of santa cruz
and san mateo counties.

Vicinity of ksfo... West wind near 15 knots this evening.VFR likely
holding much of the night, tempo ifr forecast 12z-16z Monday morning.

Vfr returns Monday. Hazy due to wildfire smoke affecting slant range
visibilities.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... MVFR ifr CIGS redeveloping this evening.

Hazy due to wildfire smoke affecting slant range visibilities. Ifr
cigs tonight and Monday morning til approx 17z.

Eclipse Here are the times for the start, peak, and end of the
eclipse for Monday morning. The percent of obscuration for each
location is also listed.

Santa rosa... San francisco... Oakland... San jose... Monterey

Start... 9:01... ... ... .9:01... ... ... 9:02... ... 9:02... ... .9:02..

Peak... 10:15... ... ... 10:15... ... ..10:15... ..10:16... ... 10:16..

End... .11:37... ... ... 11:37... ... ..11:37... ..11:38... ... 11:38..

Obsur... .78%... ... ... ..76%... ... ... .76%... ... .74%... ... ..71%...

Marine As of 4:24 pm pdt Sunday... Moderate northwest winds
will continue subsiding this evening and overnight for the outer
coastal waters. Typical breezy conditions are possible from the
golden gate bridge to angel island through the evening hours.

Winds are forecast to remain generally light for both Monday and
Tuesday.

Mtr watches warnings advisories
Tngt Sca... Sf bay until 9 pm
sca... Pt arena to pigeon pt 10-60 nm until 9 pm
public forecast: bell bfg
aviation: canepa
marine: rowe
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 mi50 min WSW 7 G 9.9 62°F 1011.6 hPa
FTPC1 - 9414290 - San Francisco, CA 9 mi56 min WSW 8 G 12 62°F 62°F1012.6 hPa
PXSC1 9 mi50 min 64°F 60°F
AAMC1 - 9414750 - Alameda, CA 9 mi50 min W 6 G 9.9 63°F 69°F1013.1 hPa
OBXC1 10 mi50 min 63°F 60°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 10 mi50 min WNW 8 G 9.9 63°F 1012.6 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 10 mi50 min W 8 G 11
LNDC1 11 mi50 min WNW 7 G 8.9 63°F 1012.6 hPa
46237 - San Francisco Bar, CA (142) 14 mi98 min 60°F4 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 15 mi56 min SW 5.1 62°F 1013 hPa
RTYC1 - 9414523 - Redwood City, CA 16 mi50 min NW 4.1 G 7 66°F 74°F1011.5 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 16 mi50 min W 8 G 12 64°F 1012.9 hPa
RCMC1 - 9414863 - Richmond, CA 17 mi56 min WNW 4.1 G 8 63°F 64°F1012.6 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 23 mi48 min N 1.9 G 1.9 60°F 60°F5 ft1013.1 hPa (+0.6)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 27 mi50 min WSW 13 G 19 64°F 1011.9 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi50 min WSW 18 G 23 64°F 69°F1011.8 hPa61°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 33 mi48 min SE 5.8 G 5.8 61°F 62°F6 ft1012.4 hPa (+0.8)
PCOC1 - 9415144 - Port Chicago, CA 33 mi50 min WSW 18 G 23 64°F 69°F1011 hPa
PRYC1 - 9415020 - Point Reyes, CA 37 mi50 min Calm G 1 64°F 62°F1013 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 38 mi50 min WNW 18 G 23 67°F 1010 hPa
SFXC1 - San Francisco Bay Reserve, CA 42 mi113 min WNW 11 68°F 1010 hPa59°F

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
W6
G9
W7
G10
W6
G9
W5
G8
W4
W3
W4
G7
W3
W4
W4
G7
W2
G5
W3
W2
N5
NW4
W4
G8
W6
G10
W7
G11
W8
G13
W7
G12
W8
G11
W6
G10
W7
G10
W5
G10
1 day
ago
W5
G9
W5
G11
W6
G9
W7
G10
W5
G10
W6
G9
W5
W4
W4
W3
W4
G9
W5
G9
W5
W7
W4
W5
G9
W6
G11
W7
G11
W10
G13
W9
G15
W8
G12
W8
G13
W9
G16
W9
G12
2 days
ago
W4
W4
W3
W3
W3
W1
SW2
NW4
W6
G9
W7
W7
G10
W8
G12
W7
G10
W6
G10
W5
G11
W8
G12
W7
G11

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA5 mi1.7 hrsW 810.00 miA Few Clouds64°F55°F75%1012 hPa
Oakland, Metro Oakland International Airport, CA11 mi45 minWNW 910.00 miPartly Cloudy63°F60°F90%1012.4 hPa
Half Moon Bay Airport, CA12 mi43 minSSE 310.00 miOvercast63°F59°F88%1012.5 hPa
San Carlos Airport, CA14 mi1.8 hrsVar 310.00 miA Few Clouds68°F57°F69%1011.8 hPa
Hayward, Hayward Air Terminal, CA16 mi44 minNNW 910.00 miFair64°F55°F75%1013 hPa
Palo Alto Airport, CA21 mi51 minNNW 810.00 miClear68°F60°F78%1012.2 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 24hrCalmS6S9S10S5SW5SW4SW4SW6S11SW6S7E5NE7NE10N10SW13W12SW8SW12W12W11W8NW8
1 day agoNW8NW7W8NW6W5W7CalmCalmS3S4Calm3NW4N3NE7NE6NE6W8
G16
NE7SW8W9W11W11W8
2 days agoW12W15W13W11W10W10W9W9W7W6W6W6NE4NE5NW12NW17NW16W16NW17NW18NW16W16W14W10

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
Mon -- 06:21 AM PDT     Moonrise
Mon -- 06:30 AM PDT     Sunrise
Mon -- 06:41 AM PDT     -0.70 feet Low Tide
Mon -- 11:31 AM PDT     New Moon
Mon -- 01:22 PM PDT     6.78 feet High Tide
Mon -- 06:44 PM PDT     1.83 feet Low Tide
Mon -- 07:53 PM PDT     Sunset
Mon -- 08:05 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
87.46.14.22.10.5-0.5-0.7-01.22.84.55.96.76.65.74.3321.92.53.75.26.6

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
Mon -- 12:19 AM PDT     -0.01 knots Slack
Mon -- 03:46 AM PDT     -1.60 knots Max Ebb
Mon -- 06:21 AM PDT     Moonrise
Mon -- 06:30 AM PDT     Sunrise
Mon -- 07:05 AM PDT     0.00 knots Slack
Mon -- 10:18 AM PDT     1.33 knots Max Flood
Mon -- 11:31 AM PDT     New Moon
Mon -- 01:31 PM PDT     -0.00 knots Slack
Mon -- 04:19 PM PDT     -1.01 knots Max Ebb
Mon -- 07:07 PM PDT     0.00 knots Slack
Mon -- 07:53 PM PDT     Sunset
Mon -- 08:04 PM PDT     Moonset
Mon -- 10:11 PM PDT     1.11 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.2-0.5-1.1-1.5-1.6-1.3-0.8-0.10.61.11.31.30.90.4-0.3-0.8-1-0.9-0.6-0.10.50.91.11

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.