Monday, June25, 2018 L-36.com


Marine Weather and Tides
Half Moon Bay, 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 5:48AMSunset 8:36PM Monday June 25, 2018 12:51 AM PDT (07:51 UTC) Moonrise 5:31PMMoonset 3:13AM Illumination 90% Phase: Waxing Gibbous; Moon at 12 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- 840 Pm Pdt Sun Jun 24 2018
.small craft advisory in effect until 9 pm pdt this evening...
Tonight..SW winds 10 to 20 kt. Wind waves 3 to 5 ft. NW swell 3 to 5 ft at 9 seconds. Patchy fog.
Mon..SW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 4 to 6 ft at 9 seconds. Patchy fog in the morning.
Mon night..W winds 15 to 25 kt. Wind waves 4 to 6 ft. NW swell 6 ft at 9 seconds. Patchy fog after midnight.
Tue..W winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 5 to 6 ft at 11 seconds. Patchy fog in the morning.
Tue night..W winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 5 to 7 ft at 10 seconds. Patchy fog after midnight.
Wed..W winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 5 to 7 ft...becoming nw 5 to 7 ft and S 3 ft. Patchy fog.
Thu..NW winds 15 to 25 kt. Wind waves 4 to 6 ft. NW swell 5 to 7 ft. SWell S 3 ft. Patchy fog.
Fri..NW winds 15 to 25 kt. Wind waves 4 to 6 ft. NW swell 5 to 7 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 9 seconds. Across the bar...combined seas 5 to 7 ft with a dominant period of 9 seconds. Maximum ebb current of 3.4 knots at 02:13 am Monday and 1.6 knots at 02:31 pm Monday.
PZZ500 840 Pm Pdt Sun Jun 24 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Strong and gusty west to southwest winds will continue north of the bay bridge, occasionally gusting to gale force from san pablo bay to the delta. Increasing northwest winds over the northern outer waters and generally decreasing south winds over the inner waters will continue tonight into Monday. Winds will gradually shift to a northwest direction over the entire coastal waters by mid to late this week.

7 Day Forecast for Marine Location Near Half Moon Bay, CA
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location: 37.47, -122.48     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 250507
afdmtr
area forecast discussion
national weather service san francisco bay area
1007 pm pdt Sun jun 24 2018

Synopsis A cooling trend will continue into Monday and
temperatures will settle around seasonal averages for much of the
week ahead. A warming trend is likely late in the work week and
into next weekend.

Discussion As of 9:05 pm pdt Sunday... A combination of
weakening high pressure aloft, a southerly surge, and return to
onshore flow allowed marine air to advance well inland today. The
result was considerable cooling today with some locations as much
as 30 degrees cooler today compared to Saturday. As of 8 pm this
evening, relative humidity values were as much as 50 percent
higher compared to last evening. Lowering temperatures and
increasing humidity has significantly lowered fire weather
concerns. Therefore, the red flag warning for the north and east
bay hills was allowed to expire at 8 pm.

Evening fort ord profiler shows the marine layer has deepened to
more than 2000 feet. This relatively deep marine layer combined
with increasing onshore flow will mean continued cooling going
into Monday, especially for the inland valleys and higher hills.

An upper trough moving through the pacific northwest tonight and
early Monday will move well off to the east by early Tuesday,
which will result in slight warming in most areas on Tuesday.

Southerly flow that is currently in place along our coast is
forecast to switch to a more typical west to northwest flow by
Tuesday which will also help boost temps in locations such as the
north bay valleys and santa cruz. However, the return of northwest
flow at the coast will mean cooler weather for areas with
northwest exposure to the ocean such as monterey.

After Tuesday's brief warm-up, expect cooling around midweek as
another trough settles in along the west coast. Longer range
models then indicate a warming and drying trend late in the week
and into next weekend as a strong upper ridge builds near the
west coast.

Aviation As of 10:07 pm pdt Sunday... Stratus on the coast
continues to move back inland tonight on onshore winds. MVFR ifr
ceilings will gradually spread inland overnight. The marine layer
has deepened tonight as an upper trough approaches. Similar mixing
out of stratus clouds can be expected on Monday.

Vicinity of ksfo...VFR through late tonight, MVFR ifr CIGS develop
early Monday morning. Southerly winds slow to return to westerly, but
should return to westerly later tonight.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Stratus clouds steadily filled back in this
evening. Onshore winds tonight and Monday.

Marine As of 8:40 pm pdt Sunday... Strong and gusty west to
southwest winds will continue north of the bay bridge,
occasionally gusting to gale force from san pablo bay to the
delta. Increasing northwest winds over the northern outer waters
and generally decreasing south winds over the inner waters will
continue tonight into Monday. Winds will gradually shift to a
northwest direction over the entire coastal waters by mid to late
this week.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pigeon pt 10-60 nm
sca... Sf bay until 2 am
public forecast: dykema
aviation marine: canepa
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 14 mi52 min W 8 G 8.9 62°F 73°F1014.3 hPa (+1.4)
PXOC1 - 9414311 - San Francisco (Pier 1), CA 23 mi52 min W 7 G 9.9 58°F 1013.3 hPa (+1.0)
FTPC1 - 9414290 - San Francisco, CA 23 mi58 min SW 2.9 G 9.9 57°F 57°F1014.6 hPa
AAMC1 - 9414750 - Alameda, CA 23 mi58 min W 8.9 G 13 60°F 69°F1014.4 hPa
46237 - San Francisco Bar, CA (142) 23 mi52 min 54°F3 ft
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 23 mi62 min SW 5.8 G 7.8 58°F 55°F4 ft1015.2 hPa (+1.0)
PXSC1 23 mi58 min 59°F 58°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 24 mi58 min W 8.9 G 12
OBXC1 24 mi52 min 59°F 59°F
LNDC1 25 mi52 min W 7 G 13 60°F 1014.2 hPa (+0.9)
OKXC1 - 9414776 - Oakland (Berth 34), CA 25 mi52 min WNW 8.9 G 11 58°F 1014.3 hPa (+1.0)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 27 mi42 min W 3.9 G 5.8 56°F 55°F1015.2 hPa56°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA 31 mi52 min WSW 8.9 G 12 60°F 1014.4 hPa (+0.9)
RCMC1 - 9414863 - Richmond, CA 32 mi58 min WSW 8 G 11 59°F 62°F1014.1 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 42 mi52 min WSW 13 G 18 60°F 1013.4 hPa (+0.8)
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi58 min W 20 G 26 60°F 67°F1013.1 hPa60°F
PRYC1 - 9415020 - Point Reyes, CA 45 mi58 min W 2.9 G 6 54°F1014.2 hPa
PCOC1 - 9415144 - Port Chicago, CA 47 mi52 min WSW 19 G 25 60°F 69°F1012.8 hPa (+0.7)
46042 - MONTEREY - 27NM West of Monterey Bay, CA 48 mi62 min SSW 1.9 G 3.9 59°F 56°F4 ft1014 hPa (+0.8)

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 mi57 minW 68.00 miOvercast57°F55°F94%1014.9 hPa
San Francisco, San Francisco International Airport, CA12 mi1.9 hrsWSW 710.00 miA Few Clouds65°F54°F68%1013.7 hPa
San Carlos Airport, CA13 mi57 minWSW 810.00 miFair61°F55°F83%1013.9 hPa
Palo Alto Airport, CA19 mi4.1 hrsNW 710.00 miClear66°F57°F73%1012.5 hPa
Oakland, Metro Oakland International Airport, CA21 mi59 minW 1510.00 miMostly Cloudy60°F57°F90%1013.9 hPa
Mountain View, Moffett Field, CA23 mi1.9 hrsNNE 1010.00 miFair64°F59°F84%1013.6 hPa
Hayward, Hayward Air Terminal, CA23 mi58 minWNW 1110.00 miMostly Cloudy62°F55°F80%1014.8 hPa

Wind History from HAF (wind in knots)
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SE9S8S10--S7SW6SW5W6
1 day agoCalmCalmCalmCalmCalmCalmCalmNW6NW11NW13NW11NW13NW13NW14NW12NW10NW12NW7NW6S6SE10SE11SE6S3
2 days agoCalmNE3CalmCalmNE5NE3NE4CalmSW5W6W6W7NW7NW11NW11NW14N12NW13NW8NW6NW3CalmCalmCalm

Tide / Current Tables for Half Moon Bay, California
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Half Moon Bay
Click for Map
Mon -- 03:56 AM PDT     -0.33 feet Low Tide
Mon -- 04:12 AM PDT     Moonset
Mon -- 05:50 AM PDT     Sunrise
Mon -- 10:38 AM PDT     4.06 feet High Tide
Mon -- 03:24 PM PDT     2.41 feet Low Tide
Mon -- 06:30 PM PDT     Moonrise
Mon -- 08:35 PM PDT     Sunset
Mon -- 09:27 PM PDT     5.85 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.21.80.6-0.1-0.3-00.61.52.53.4443.73.22.72.42.52.93.74.55.35.85.85.2

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
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San Mateo Bridge
Click for Map
Mon -- 03:28 AM PDT     -1.75 knots Max Ebb
Mon -- 04:11 AM PDT     Moonset
Mon -- 05:49 AM PDT     Sunrise
Mon -- 06:51 AM PDT     0.00 knots Slack
Mon -- 09:52 AM PDT     1.81 knots Max Flood
Mon -- 01:10 PM PDT     -0.00 knots Slack
Mon -- 04:06 PM PDT     -0.86 knots Max Ebb
Mon -- 06:29 PM PDT     Moonrise
Mon -- 06:40 PM PDT     0.00 knots Slack
Mon -- 08:34 PM PDT     Sunset
Mon -- 09:23 PM PDT     1.38 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.2-0.9-1.5-1.7-1.7-1.4-0.80.21.11.61.81.610.1-0.5-0.8-0.9-0.8-0.40.311.31.31

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 (3,6,7,8)
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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.