Thursday, May25, 2017 L-36.com


Marine Weather and Tides
Daly City, CA

Version 3.4
What's New / NOTES
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 5:50AMSunset 8:23PM Thursday May 25, 2017 11:14 AM PDT (18:14 UTC) Moonrise 5:06AMMoonset 7:24PM 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
PZZ545 Point Reyes To Pigeon Point To 10 Nm- 830 Am Pdt Thu May 25 2017
Today..S winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 4 to 6 ft at 11 seconds.
Tonight..S winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 4 to 6 ft at 10 seconds.
Fri..S winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 5 ft at 10 seconds.
Fri night..SW winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft at 10 seconds. Patchy fog after midnight.
Sat..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 4 ft at 10 seconds. Patchy fog in the morning.
Sun..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 3 ft.
Memorial day..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 3 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 4 to 6 ft with a period of 12 seconds. Across the bar...combined seas 5 to 7 ft with a period of 12 seconds. Maximum ebb current of 1.1 knots at 03:48 pm Thursday and 2.2 knots at 03:42 am Friday.
PZZ500 830 Am Pdt Thu May 25 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Increasing south to southwest winds are expected near the coastline and across the bays today...strongest along the big sur coast. These winds will generate steep fresh swell in the vicinity. Otherwise...light seas. High pressure will redevelop over the eastern pacific just prior to the memorial day weekend bringing a return to more typical afternoon and evening onshore winds to the coastal waters and bays.

7 Day Forecast for Marine Location Near Daly City, CA
   Hourly   EDIT   Help
location: 37.77, -122.54     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kmtr 251750
afdmtr
area forecast discussion
national weather service san francisco bay area
1050 am pdt Thu may 25 2017

Synopsis Seasonably cool today into Friday with a deep marine
layer near the coast. Seasonable temperatures on Saturday should
trend warmer inland by Sunday and memorial day Monday. Aside from
the isolated coastal drizzle, dry weather forecast through the
next 7 to 10 days.

Discussion As of 08:00 am pdt Thursday... Only made minor
tweaks to the short-term forecast with sky cover. Satellite
reveals an extensive marine layer intruding well inland through
the delta pushing up against the sierra foothills. Fort ord
profiler indicates the marine layer depth has steadily deepened
over the past 24 hours to over 3500 ft this morning and is
approaching 4000 ft. There have also been some reports of drizzle
or even light rain associated with the low clouds in the north
bay. Santa rosa ASOS has reported several one-hundreds of an inch
since midnight.

Upper level low continues to approach the central california coast
and will help to maintain the downward trend in afternoon highs
through the end of the work week. MAX temps for many inland
locations will be anywhere from 5 to perhaps as much as 15 degrees
below normal for late may. The cool weather will be short-lived,
however, as a ridge will be quick to build over the west coast for
the holiday weekend with temperatures rebounding back to normal or
even several degrees above normal. Guidance suggests that the
southern salinas valley may return back to low 90s as early as
Sunday. While the inland areas ride their temperature roller
coaster, coastal locations influenced by low clouds will struggle
to see temperatures change any more than 5 degrees over the
forecast period. The only chance for precipitation over the next 7
days will be for coastal areas that may see isolated drizzle or
light rain.

Prev discussion As of 3:23 am pdt Thursday... Profiler data shows
the marine layer has deepened in excess of 3000 feet with cooler
air aloft keeping the inversion weak. This has allowed deep inland
penetration of marine clouds with a finger now pushing out into
the delta while nearly the entire north bay is completely
inundated as well. Onshore gradient is only 2 mb from sfo to sac
but gusts from 20 to 30 kt are showing up at angel island, concord
and travis which is a sure sign of another cool day for inland
areas with highs struggling to reach 70. In addition to the
extensive cloud cover and onshore push the models continue to show
some drizzle along the coast from half moon bay to big sur this
morning. Forecast grids will continue to show some patchy drizzle
this morning as the Sun comes up, just enough to wet the surfaces
but only expecting trace amounts.

The upper pattern wont change too much on Friday with cyclonic
flow aloft and onshore flow at the surface keeping temps on the
cool side of normal.

As is typical this time of year day to day changes can be hard to
nail down as the subtle marine perturbations can drive the daily
patterns. However the general trend of the holiday weekend shows
near normal temperatures on Saturday then climbing back to above
normal for inland areas on Saturday and Sunday as high pressure
briefly rebuilds. All in all it looks to be a nice holiday weekend
with dry conditions and no excessively hot inland weather. Longer
range trends portend a dry and seasonable pattern through much of
next week as we head into june.

Aviation As of 10:37 am pdt Thursday... Deep marine intrusion
continues over the region with south southwest winds pushing lower
clouds over the coastal ranges. Bases are lifting at times,
especially inland away from the coast. Do expect some inland areas
to see clouds scattering out briefly this afternoon, while coastal
and potentially north bay terminals remain under a cloud deck
through much of the day. Stratus returns late this evening and
will likely lower overnight into early Friday morning. Otherwise,
breezy to occasionally gusty west to southwest winds, especially
along the coast in the afternoon and evening.

Vicinity of ksfo... Bkn cloud deck over the terminal for much of
the morning is beginning to scatter out and should give way to
vfr CIGS by 1830z-1900z. Breezy and gusty southerly winds are
forecast to become more westerly by the early afternoon. Winds
diminish slightly late this evening with stratus deck returning
between 0500z-0700z. Similar burn-off time likely on Friday.

Moderate confidence.

Sfo bridge approach... Bkn cloud deck may linger over the approach
through 20z. Otherwise, similar to ksfo.

Monterey bay terminals... MVFR CIGS through the day with cloud
deck potentially scattering out or lifting above 3kft at times
this afternoon. Otherwise, breezy onshore winds are expected
through the afternoon and evening. Winds diminish late in the
evening with lowering CIGS likely overnight.

Moderate confidence.

Marine As of 10:37 am pdt Thursday... Increasing south to
southwest winds are expected near the coastline and across the
bays today, strongest along the big sur coast. These winds will
generate steep fresh swell in the vicinity. Otherwise, light
seas. High pressure will redevelop over the eastern pacific just
prior to the memorial day weekend bringing a return to more
typical afternoon and evening onshore winds to the coastal waters
and bays.

Mtr watches warnings advisories
Tday Sca... Mry bay
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Sf bay from 3 pm
public forecast: rowe rww
aviation: rgass
marine: rgass
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
46237 - San Francisco Bar, CA (142) 5 mi75 min 54°F5 ft
FTPC1 - 9414290 - San Francisco, CA 5 mi57 min WSW 7 G 14 55°F 57°F1008.9 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 8 mi63 min N 4.1 G 8 58°F 1007.4 hPa
PXSC1 8 mi57 min 58°F 51°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 10 mi68 min SE 5.1 55°F 1009 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 11 mi57 min SSW 9.9 G 13 60°F 1008.4 hPa
OBXC1 11 mi57 min 58°F 51°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 11 mi57 min SSW 13 G 15
AAMC1 - 9414750 - Alameda, CA 13 mi57 min SSW 12 G 17 58°F 62°F1008.9 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 13 mi57 min SW 18 G 20 56°F 1008.6 hPa
RCMC1 - 9414863 - Richmond, CA 13 mi57 min SSW 13 G 18 55°F 59°F1008.4 hPa
LNDC1 14 mi63 min SW 11 G 15 58°F 1008.4 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 16 mi85 min SSW 7.8 G 7.8 51°F 53°F5 ft1008.7 hPa (+1.2)
RTYC1 - 9414523 - Redwood City, CA 25 mi57 min SSW 7 G 13 61°F 68°F1007.8 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 25 mi57 min WSW 12 G 15 58°F 1008.2 hPa
PRYC1 - 9415020 - Point Reyes, CA 28 mi57 min SE 6 G 14 54°F 56°F1008.1 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi57 min SW 8 G 11 60°F 65°F1008.4 hPa50°F
UPBC1 29 mi57 min W 6 G 14
PCOC1 - 9415144 - Port Chicago, CA 33 mi51 min SW 8.9 G 14 60°F 64°F1007.9 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 33 mi85 min SW 7.8 G 9.7 52°F 54°F7 ft1008.6 hPa (+1.1)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 39 mi57 min WNW 14 G 17 62°F 1007.4 hPa
SFXC1 - San Francisco Bay Reserve, CA 40 mi90 min W 8.9 59°F 1008 hPa52°F

Wind History for San Francisco, CA
(wind in knots)    EDIT      (on/off)   Help
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
7
AM
8
AM
9
AM
10
AM
11
AM
Last
24hr
SW7
G11
SW11
G19
SW8
G15
SW8
G20
SW9
G19
W10
G20
W12
G17
W13
G20
SW9
G15
SW9
G18
SW6
G15
SW9
G14
SW8
G13
SW8
G14
W9
G14
SW8
G11
SW11
G16
W6
G10
SW8
G13
SW7
G11
SW9
G12
S6
G15
SW9
G19
W6
G11
1 day
ago
SW6
G13
SW4
G11
W9
G15
W11
G17
W11
G18
W9
G16
W10
G18
W7
G13
W3
G7
W4
G11
W5
G9
W2
G7
SW4
G9
W3
G9
SW5
G8
SW2
G9
W3
G9
SW8
G12
SW5
G9
SW4
G9
SW7
G10
SW8
G13
SW6
G11
SW5
G9
2 days
ago
W6
G11
SW6
G15
SW9
G19
SW12
G17
W6
G17
SW11
G19
SW7
G16
SW11
G16
SW5
G12
SW7
G14
SW3
G7
W2
G5
W6
G10
SW3
G12
SW6
G11
W2
G5
SW3
G8
W5
G8
W3
SW3
G8
W1
G4
W4
G8
SW4
G8
W5
G10

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA14 mi19 minSSW 20 G 2510.00 miPartly Cloudy and Breezy63°F48°F60%1008.3 hPa
Half Moon Bay Airport, CA18 mi20 minS 115.00 miFog/Mist55°F51°F88%1009.5 hPa
Oakland, Metro Oakland International Airport, CA18 mi22 minSW 1510.00 miOvercast64°F52°F65%1008.5 hPa
San Carlos Airport, CA23 mi20 minSSW 13 G 1810.00 miMostly Cloudy63°F48°F60%1008.5 hPa
Hayward, Hayward Air Terminal, CA24 mi21 minSW 710.00 miMostly Cloudy65°F46°F51%1009 hPa

Wind History from SFO (wind in knots)
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
7
AM
8
AM
9
AM
10
AM
11
AM
Last 24hrNE7E6NE7NE6S9S14SW11S13S8SW7S13S11S10S8S11S14
G21
SW8S12S8S6S10
G18
S14
G20
S19
G24
S20
G25
1 day agoNW10NW14NW19W22NW20NW20W19W20W17W15W13W13NW11W10W9W10W7W8W6W7NW8CalmCalmNE6
2 days agoNW9NW13NW14NW17NW18W19
G25
W21W20NW18W14NW11W10W8W7W10NW11W10W9W7W5SW3NW8NW9NW11

Tide / Current Tables for Ocean Beach, outer coast, California
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Ocean Beach
Click for Map
Thu -- 05:10 AM PDT     -1.36 feet Low Tide
Thu -- 05:52 AM PDT     Sunrise
Thu -- 06:06 AM PDT     Moonrise
Thu -- 11:57 AM PDT     5.01 feet High Tide
Thu -- 12:46 PM PDT     New Moon
Thu -- 05:00 PM PDT     1.71 feet Low Tide
Thu -- 08:21 PM PDT     Sunset
Thu -- 08:23 PM PDT     Moonset
Thu -- 11:05 PM PDT     6.80 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.74.12.30.5-0.8-1.4-1.1-0.21.12.43.74.754.73.82.821.72.134.25.46.46.8

Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
   EDIT      (on/off)   Help   One Week of Data
South Channel
Click for Map
Thu -- 03:04 AM PDT     -2.33 knots Max Ebb
Thu -- 05:53 AM PDT     Sunrise
Thu -- 06:06 AM PDT     Moonrise
Thu -- 06:32 AM PDT     0.00 knots Slack
Thu -- 09:35 AM PDT     1.88 knots Max Flood
Thu -- 12:46 PM PDT     New Moon
Thu -- 01:20 PM PDT     -0.00 knots Slack
Thu -- 03:37 PM PDT     -1.37 knots Max Ebb
Thu -- 06:29 PM PDT     0.00 knots Slack
Thu -- 08:21 PM PDT     Sunset
Thu -- 08:23 PM PDT     Moonset
Thu -- 09:25 PM PDT     1.47 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0-1.1-2-2.3-2.1-1.4-0.60.41.31.81.91.610.3-0.6-1.3-1.3-0.9-0.30.411.41.41.1

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 (14,3,4,5)
      (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.