Thursday, June21, 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 5:47AMSunset 8:36PM Thursday June 21, 2018 7:11 AM PDT (14:11 UTC) Moonrise 1:34PMMoonset 1:00AM Illumination 57% Phase: First Quarter Moon; Moon at 8 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
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PZZ545 Point Reyes To Pigeon Point To 10 Nm- 240 Am Pdt Thu Jun 21 2018
.small craft advisory in effect through late tonight...
Today..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 5 to 7 ft at 11 seconds. Patchy fog in the morning.
Tonight..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 5 to 7 ft at 11 seconds.
Fri..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 5 to 7 ft at 11 seconds.
Fri night..NW winds 15 to 25 kt. Wind waves 5 to 7 ft. NW swell 6 to 8 ft at 11 seconds.
Sat..NW winds 15 to 25 kt...becoming W 5 to 15 kt. Wind waves 4 to 6 ft. NW swell 5 to 7 ft at 11 seconds.
Sun..SW winds 5 to 15 kt. Wind waves 1 to 3 ft...becoming 2 ft or less. NW swell 5 to 7 ft. Patchy fog.
Mon..W winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 4 to 6 ft. Patchy fog.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 4 to 6 ft with a dominant period of 11 seconds increasing to 5 to 7 ft Thursday evening. Across the bar...combined seas 5 to 7 ft with a dominant period of 11 seconds increasing to 6 to 8 ft Thursday evening. Maximum ebb current of 2.1 knots at 10:49 am Thursday and 2.6 knots at 11:55 pm Thursday.
PZZ500 240 Am Pdt Thu Jun 21 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure over the eastern pacific will continue to strengthen through the rest of the week and into the weekend. In response, strong and gusty northwest winds are expected to affect the majority of the coastal waters zones through this period. Winds are expected to be strongest over the northern outer most coastal waters, strengthening to near gale force, with gale force gusts, by Friday evening through Saturday morning. As a result of the strong winds, steep and hazardous seas are likely for the majority of the coastal waters through at least the first half of the weekend.

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


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 211146
afdmtr
area forecast discussion
national weather service san francisco bay area
446 am pdt Thu jun 21 2018

Synopsis A robust warming trend will begin over the next
several days as high pressure builds off the west coast. This will
lead to hot conditions on Saturday with moderate to locally high
heat risks across parts of the region. Additionally, winds will
turn offshore, bringing heightened fire weather concerns to parts
of the area on Saturday. Cooling will commence on Sunday along
with the redevelopment of the marine layer for early next week.

Discussion As of 3:15 am pdt Thursday... Goes-east fog product
reveals areas of stratus again impacting parts of the san
francisco bay area and central california coast this early
Thursday morning. The fort ord profiler along the monterey bay
shoreline indicates the marine layer is running around 1,000 ft
deep, similar to what it was 24 hour ago. Despite the similar
marine layer depth, the stratus coverage doesn't appear to be
quite as widespread as it was yesterday morning.

Synoptically-speaking, an upper level high is presently centered
in southwestern arizona. A quick shortwave trough is currently
pushing through the outer periphery of this high across northern
california, and will quickly exit the state within the next 6-12
hours. Some weak ridging is expected to occur behind this
shortwave during the day, which should allow for some warming
across interior locations this afternoon.

By Friday, an upper level ridge will begin to amplify off the
california coast, resulting in further warming across interior
locations. We'll likely see some locations in the interior north
bay, interior east bay, and southern reaches of monterey and san
benito counties reach the triple digits for Friday afternoon. The
warming will continue on Saturday for what should be the hottest
day as the ridge continues to strengthen offshore. The hottest
areas of the county warning area -- far northern sonoma and napa
counties, far interior east bay, and far southern monterey + san
benito counties -- may flirt with 105 degrees on Saturday. The
warm-to-hot conditions will likely creep toward the san francisco
bay shoreline as well -- 90s to low 100s seem quite probable
along the us 101 corridor from gilroy north through san jose and
continuing toward redwood city. Temperatures farther north toward
sfo and san francisco will likely be cooler with highs along the
bay shoreline in the 80s with cooler conditions along the
immediate pacific coast. These temperatures are expected to
produce moderate to locally high heat risks across much of the
interior, and will likely see heat advisory headlines launched
later today for certain zones as a result of these forecasted hot
conditions.

Another concern for late Friday night Saturday will be locally
breezy north to northeast winds over the north bay mountains.

High-resolution models are starting to capture this event, and are
showing wind speeds around 15 to 25 mph with local gusts around
35 mph across far northern napa and sonoma counties. Combined with
poor relative humidity recoveries, this will likely lead to
heightened fire weather concerns.

For Sunday, models have consistently been advertising appreciable
cooling across the region as the ridge axis pushes east into the
north american continent. Additionally, the gfs, nam, and local
in-house WRF model have suggested the potential for a southerly
surge pushing north along the monterey county coast and continuing
toward the golden gate during the day. Cooling will continue into
the first half of next week with highs gradually returning close
to late june climatological normals.

Aviation As of 4:46 am pdt Thursday... For 12z tafs. Marine
layer currently sits slightly below 1,000 feet, per the ft. Ord
profiler. Goes-16 fog product shows patchy stratus affecting the
greater sf bay terminals (bkn ovc deck around 1,200 feet), as well
as monterey bay terminals (bkn ovc deck around 500 feet). The
shallow stratus should erode by 16-17z for most terminals this
morning. Building ridge of high pressure will compress the marine
layer even more by this evening. Therefore, not expecting CIGS to
form tonight. However, there could be some patchy dense fog that
may reduce vsby around the monterey bay region overnight tonight,
low confidence on exact timing. Light to moderate west northwest
winds this afternoon, locally gusty at times.

Moderate-high forecast confidence.

Vicinity of ksfo... MVFR CIGS becomingVFR by 16-17z. Onshore winds
15-20 kt, with higher gusts possible by this afternoon. A very
compressed marine layer should keep CIGS from forming tonight.

Sfo bridge approach... Approach remains clear for now (per smb ob),
but intermittent MVFR CIGS possible before 16z.

Monterey bay terminals... Lifr ifr CIGS through about 16-17z, then
vfr. Light to moderate west northwest winds this afternoon, around
10-12 kt. Compressed marine layer may produce fog tonight,
reducing horizontal and vertical vsby by Friday morning.

Fire weather As of 3:15 am pdt Wednesday... A pronounced
warming and drying trend is forecast for the end of the week as
high pressure builds in and winds turn offshore. Saturday
presently looks to be the hottest day, with poor overnight
relative humidity recoveries for both Friday night and Saturday
night. Locally gusty north to northeast winds are possible in the
north bay hills Friday night and Saturday morning. A return to
cooling and redevelopment of the marine layer appears in store for
Sunday into the first part of next week as flow shifts back
onshore.

Marine As of 2:40 am pdt Thursday... High pressure over the
eastern pacific will continue to strengthen through the rest of
the week and into the weekend. In response, strong and gusty
northwest winds are expected to affect the majority of the coastal
waters zones through this period. Winds are expected to be
strongest over the northern outer most coastal waters,
strengthening to near gale force, with gale force gusts, by Friday
evening through Saturday morning. As a result of the strong
winds, steep and hazardous seas are likely for the majority of the
coastal waters through at least the first half of the weekend.

Mtr watches warnings advisories
Tday Sca... Pigeon pt to pt pinos 0-10 nm
sca... Pt arena to pt reyes 0-10 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Pt reyes to pigeon pt 0-10 nm
sca... Mry bay from 12 pm
public forecast: rowe
aviation: bam
marine: bam
fire weather: rowe
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 18 mi41 min W 8.9 G 9.9 54°F 69°F1017.4 hPa
46237 - San Francisco Bar, CA (142) 19 mi41 min 52°F5 ft
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 20 mi81 min NNW 14 G 16 53°F 53°F6 ft1017.6 hPa (+0.3)
FTPC1 - 9414290 - San Francisco, CA 21 mi47 min WSW 1.9 G 5.1 52°F 58°F1016.5 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 22 mi41 min SSE 1.9 G 6 52°F 1015.4 hPa
PXSC1 22 mi41 min 54°F 52°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi31 min NW 19 G 25 53°F 52°F1017.1 hPa53°F
AAMC1 - 9414750 - Alameda, CA 23 mi47 min WSW 2.9 G 6 54°F 66°F1016.7 hPa
OBXC1 23 mi41 min 53°F 52°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 24 mi41 min SW 7 G 9.9
OKXC1 - 9414776 - Oakland (Berth 34), CA 24 mi41 min SW 5.1 G 8 53°F 1016.6 hPa
LNDC1 25 mi41 min SSE 5.1 G 7 54°F 1016.5 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 27 mi48 min WSW 1 51°F 1016 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 29 mi41 min SSE 9.9 G 13 55°F 1016.6 hPa
RCMC1 - 9414863 - Richmond, CA 30 mi47 min SSE 7 G 9.9 54°F 60°F1016.1 hPa
PRYC1 - 9415020 - Point Reyes, CA 40 mi41 min NW 22 G 27 53°F1016.1 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 41 mi41 min WSW 8 G 13 56°F 1015.4 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi41 min WSW 4.1 G 7 57°F 66°F1015.7 hPa53°F
PCOC1 - 9415144 - Port Chicago, CA 47 mi41 min SW 6 G 9.9 53°F 67°F1015.3 hPa

Wind History for Redwood City, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA3 mi71 minNNW 88.00 miOvercast52°F50°F94%1017.3 hPa
San Francisco, San Francisco International Airport, CA13 mi75 minWSW 14 G 1910.00 miOvercast55°F48°F77%1016.6 hPa
San Carlos Airport, CA16 mi71 minW 610.00 miOvercast55°F48°F77%1016.9 hPa
Oakland, Metro Oakland International Airport, CA22 mi78 minVar 46.00 miFog/Mist54°F51°F90%1016.6 hPa
Palo Alto Airport, CA23 mi24 minN 010.00 miOvercast55°F51°F88%1016.9 hPa

Wind History from SFO (wind in knots)
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Last 24hrW8W9W10W15W13W14W19
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1 day agoW5W7W6W10NW12NW15W20NW15
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2 days agoSW6W4N4N7NW9NW13NW15W20W18W18W20W21
G26
W20W18W11NW14W11W11W14NW7W8W9W6W6

Tide / Current Tables for Princeton, Half Moon Bay, California
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Princeton
Click for Map
Thu -- 12:23 AM PDT     1.50 feet Low Tide
Thu -- 02:00 AM PDT     Moonset
Thu -- 05:49 AM PDT     Sunrise
Thu -- 05:54 AM PDT     3.89 feet High Tide
Thu -- 11:58 AM PDT     0.78 feet Low Tide
Thu -- 02:33 PM PDT     Moonrise
Thu -- 06:47 PM PDT     5.61 feet High Tide
Thu -- 08:34 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.51.622.63.23.73.93.73.12.31.510.811.72.73.74.75.45.65.24.43.32.2

Tide / Current Tables for Sierra Point 1.3 mi ENE, South San Francisco Bay, California Current
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Sierra Point 1.3 mi ENE
Click for Map
Thu -- 01:59 AM PDT     Moonset
Thu -- 02:20 AM PDT     0.01 knots Slack
Thu -- 05:18 AM PDT     0.68 knots Max Flood
Thu -- 05:48 AM PDT     Sunrise
Thu -- 08:05 AM PDT     -0.00 knots Slack
Thu -- 11:03 AM PDT     -0.83 knots Max Ebb
Thu -- 02:15 PM PDT     0.00 knots Slack
Thu -- 02:33 PM PDT     Moonrise
Thu -- 05:36 PM PDT     0.92 knots Max Flood
Thu -- 08:34 PM PDT     Sunset
Thu -- 08:41 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.8-0.6-0.20.30.60.70.60.40-0.4-0.7-0.8-0.7-0.5-0.10.30.70.90.90.70.4-0.2-0.6-0.9

Weather Map and Satellite Images
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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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (10,2,3,4)
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Ground Weather Radar Station San Francisco Bay Area, CA
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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.