Friday, July20, 2018 L-36.com


Marine Weather and Tides
Moss Beach, CA

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.

Sunrise 6:03AMSunset 8:29PM Friday July 20, 2018 2:00 AM PDT (09:00 UTC) Moonrise 1:28PMMoonset 12:06AM Illumination 49% Phase: First Quarter Moon; Moon at 7 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- 902 Pm Pdt Thu Jul 19 2018
Tonight..S winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 4 to 6 ft at 9 seconds. Patchy fog after midnight.
Fri..S winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 5 ft at 7 seconds. Patchy fog in the morning. Slight chance of Thunderstorms in the afternoon.
Fri night..S winds 5 to 15 kt with gusts up to 25 kt. Wind waves 2 to 4 ft. NW swell 3 to 5 ft at 10 seconds. Patchy fog. A slight chance of showers and Thunderstorms.
Sat..SW winds 5 to 10 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft at 10 seconds. Patchy fog.
Sat night..W winds up to 10 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft at 10 seconds and sw around 3 ft at 20 seconds. Patchy fog.
Sun..W winds 5 to 10 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft and sw around 3 ft. Patchy fog.
Sun night..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 4 ft and sw around 3 ft. Patchy fog.
Mon..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell around 3 ft and sw 3 to 5 ft. Patchy fog.
Tue..W winds 5 to 15 kt. Wind waves 1 to 3 ft. Mixed swell nw around 3 ft and sw 3 to 5 ft. Patchy fog.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 3 to 5 ft with a dominant period of 9 seconds. Across the bar...combined seas 4 to 6 ft with a dominant period of 9 seconds. Maximum ebb current of 2.3 knots at 10:13 pm Thursday and 1.9 knots at 10:31 am Friday.
PZZ500 902 Pm Pdt Thu Jul 19 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... North northwesterly winds will gradually become more southerly through Friday as a weak low pressure system develops off the coast. In the meantime, gusty north northwesterly winds will persist north of point reyes. Monsoonal moisture entering from the southeast will lead to a very slight chance of Thunderstorms Friday. A southerly swell will arrive Saturday night and continue through early next week.

7 Day Forecast for Marine Location Near Moss Beach, CA
   Hourly   EDIT   Help
location: 37.51, -122.56     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kmtr 200555
afdmtr
area forecast discussion
national weather service san francisco bay area
1055 pm pdt Thu jul 19 2018

Synopsis Monsoon moisture is expected to spread from south to
north across the region late tonight and Friday, resulting in a
slight chance of high-based showers and thunderstorms. Meanwhile,
seasonably warm daytime temperatures will persist region-wide
with marine air keeping conditions cooler near the coast. A more
robust warming trend is then possible next week, especially for
inland areas, as high pressure builds over the region.

Discussion As of 8:55 pm pdt Thursday... As has been the case
the past several days, today was another warm day inland, with
temperatures in the inland valleys from 5 to 10 degrees above
normal. Meanwhile, a persistent marine layer with a depth of about
1500 feet, along with continued onshore flow, kept coastal
temperatures near seasonal averages. No significant changes to
this temperature pattern are expected through the weekend and into
early next week.

Primary forecast concern in the short-term is monsoon moisture
that continues to flow up from the southeast. Moisture today was
primary confined to our east and southwest, with the bulk of the
monsoon moisture over the southern sierra and well offshore.

Models generally agree that another pulse of mid upper level
moisture and instability will move from southeast to northwest
across our area from late tonight through Friday. Based on the 00z
nam, this incoming moisture instability will not spread north as
quickly as previously forecast. Therefore, a forecast update
earlier this evening included confining slight shower thunderstorm
chances only to areas south of monterey bay late tonight, to
areas south of san jose on Friday morning, and to areas south of
santa rosa on Friday afternoon. Also, both the NAM and GFS agree
that convective precipitation potential will be highest across the
south and become less likely farther to the north.

An increase in mid upper level clouds tomorrow will likely result
in slight cooling in most places. At the same time, look for this
increased moisture to result in warmer nights, particularly on
Friday night.

Drier southwest flow aloft will develop by the weekend, which will
bring an end to precipitation chances.

A large upper high that dominates the the southwestern united
states is currently centered near the new mexico texas border.

Models agree that this high will slowly retrograde over the next
week and be centered over southern california by a week from
today. This will likely mean warmer temperatures inland by the
middle of next week. But onshore flow is projected to persist
through the week, keeping coastal areas mild.

Aviation As of 10:50 pm pdt Thursday... For 06z tafs... Ceiling
onset occurred in the early evening at the monterey bay
terminals, whileVFR conditions continue at all san francisco bay
area terminals. Marine stratus is moving into the coastal valleys
a bit slower than yesterday evening, but still think ceiling
development likely at all terminals but ksjc and klvk during the
overnight hours. Clearing Friday morning looks to occur by
midmorning around sf bay and late morning monterey bay. The marine
layer depth is remaining pretty steady and shallow, with latest
coastal profiler data and ksql sodar indicating an inversion
height in the 900 to 1300 foot range. Some upper level moisture
and instability is projected to spread over the area from the se
on Friday and result in a slight chance of thunderstorms.

Vicinity of ksfo... Low-to-moderate confidence in projected late-
night ceiling development. Higher confidence inVFR conditions
prevailing after about 16z Friday.

Sfo bridge approach... Similar to sfo.

Monterey bay terminals... High confidence ceilings will continue
through at least midmorning on Friday, but lower confidence in
details of height and visibility variation.

Marine As of 08:57 am pdt Thursday... Light to moderate winds
will once again prevail over the coastal waters. Winds will be
locally stronger north of point reyes. Winds along the coast will
turn southerly on Friday as low pressure develops off the southern
california coast. Monsoonal moisture from the SE will leave a
very slight chance of thunderstorms Thursday and Friday. A
southerly swell will arrive Saturday night and continue through
early next week.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pigeon pt 10-60 nm
public forecast: dykema
aviation: blier
marine: blier
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 18 mi30 min NNW 1.9 G 4.1 61°F 74°F1012.4 hPa
46237 - San Francisco Bar, CA (142) 19 mi60 min 59°F4 ft
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 20 mi70 min S 5.8 G 9.7 56°F 61°F7 ft1013.1 hPa (+0.0)
FTPC1 - 9414290 - San Francisco, CA 21 mi36 min WSW 6 G 9.9 57°F 60°F1012.5 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 22 mi30 min W 7 G 11 58°F 1011 hPa
PXSC1 22 mi30 min 59°F 58°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi20 min S 9.7 G 14 57°F 58°F1012.7 hPa
OBXC1 23 mi30 min 59°F 58°F
AAMC1 - 9414750 - Alameda, CA 23 mi36 min WNW 4.1 G 5.1 59°F 71°F1012.2 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 24 mi30 min NW 2.9 G 4.1
OKXC1 - 9414776 - Oakland (Berth 34), CA 24 mi30 min WNW 5.1 G 6 59°F 1012 hPa
LNDC1 25 mi30 min N 4.1 G 5.1 60°F 1012 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 29 mi30 min SW 8.9 G 12 59°F 1012.2 hPa
RCMC1 - 9414863 - Richmond, CA 30 mi36 min SW 4.1 G 6 59°F 65°F1011.9 hPa
PRYC1 - 9415020 - Point Reyes, CA 40 mi30 min E 8 G 14 60°F1012 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 41 mi36 min WSW 11 G 15 59°F 1011.5 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi30 min W 18 G 20 60°F 69°F1011 hPa60°F
PCOC1 - 9415144 - Port Chicago, CA 47 mi30 min W 23 G 27 60°F 69°F1010.4 hPa

Wind History for Redwood City, CA
(wind in knots)    EDIT      (on/off)   Help
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
1
AM
Last
24hr
NW4
NW4
NW3
NW3
N4
N2
N1
N4
N4
N6
G9
NW7
G10
N7
G11
NW9
NW10
NW12
NW13
G16
N14
G17
N13
G16
N12
N8
N8
N4
N2
NW2
1 day
ago
NW3
NW5
NW4
E3
S2
E3
SE1
N4
N6
N5
G8
NW8
N10
N13
G16
N13
N14
N15
N13
N13
N12
N8
G11
NW6
NW6
NW4
NW3
2 days
ago
NW5
NW2
NW6
NW6
NW1
N2
N6
NW8
NW9
G13
N14
N15
NW15
NW13
G17
NW12
G15
N9
NW12
G15
NW7
NW5
NW5
NW4
NW5

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA3 mi60 minSSE 117.00 miOvercast57°F55°F94%1012.9 hPa
San Francisco, San Francisco International Airport, CA13 mi64 minWNW 610.00 miA Few Clouds58°F53°F84%1011.9 hPa
San Carlos Airport, CA16 mi60 minN 010.00 miFair63°F57°F83%1012.2 hPa
Oakland, Metro Oakland International Airport, CA22 mi67 minNNW 610.00 miA Few Clouds58°F55°F93%1012.2 hPa

Wind History from HAF (wind in knots)
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
1
AM
2
AM
Last 24hrSE7SE6S11SE9SE8SE8SE7SE7SE6S7S6SW8S9S8S9S10S9S9S8SE8SE9SE9S10S11
1 day agoCalmCalmE4SE4NE3SE3E4SE4S6SE5S8S8S8S8S7SW6S6SW4S5SE6S7SE5S6S5
2 days agoW4NW4NE3--N4NE3CalmW4SW3SW5NW7W6NW8NW7NW8NW10N7NW6NW4CalmNW3CalmCalmSW4

Tide / Current Tables for Princeton, Half Moon Bay, California
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Princeton
Click for Map
Fri -- 01:06 AM PDT     Moonset
Fri -- 05:43 AM PDT     3.81 feet High Tide
Fri -- 06:04 AM PDT     Sunrise
Fri -- 11:25 AM PDT     1.54 feet Low Tide
Fri -- 02:27 PM PDT     Moonrise
Fri -- 06:02 PM PDT     5.68 feet High Tide
Fri -- 08:27 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.31.522.73.33.73.83.532.41.91.61.62.12.83.84.75.45.75.54.83.82.61.7

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
Fri -- 01:05 AM PDT     Moonset
Fri -- 01:48 AM PDT     0.01 knots Slack
Fri -- 04:50 AM PDT     0.70 knots Max Flood
Fri -- 06:03 AM PDT     Sunrise
Fri -- 07:46 AM PDT     -0.00 knots Slack
Fri -- 10:29 AM PDT     -0.69 knots Max Ebb
Fri -- 01:39 PM PDT     0.01 knots Slack
Fri -- 02:27 PM PDT     Moonrise
Fri -- 04:52 PM PDT     0.79 knots Max Flood
Fri -- 07:57 PM PDT     -0.00 knots Slack
Fri -- 08:27 PM PDT     Sunset
Fri -- 11:18 PM PDT     -1.01 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.7-0.40.10.40.70.70.60.3-0.1-0.5-0.7-0.7-0.5-0.30.10.50.70.80.70.4-0-0.5-0.9-1

Weather Map and Satellite Images
       (on/off)   HelpWeather Map
wmap_P
GOES Local Image of CentralWestCoast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (5,6,7,8)
      (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.