Tuesday, September26, 2017 L-36.com


Marine Weather and Tides
Rio del Mar, 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 6:58AMSunset 6:58PM Tuesday September 26, 2017 4:07 AM PDT (11:07 UTC) Moonrise 12:01PMMoonset 10:21PM Illumination 33% Phase: Waxing Crescent; Moon at 6 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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PZZ535 Monterey Bay- 251 Am Pdt Tue Sep 26 2017
Today..N winds 5 kt...becoming W 5 to 15 kt in the afternoon. Waves 1 to 3 ft. NW swell 2 to 4 ft at 9 seconds.
Tonight..SW winds 5 to 15 kt...becoming northeast 5 kt after midnight. Wind waves 3 ft in the evening...becoming 2 ft or less. NW swell 2 to 3 ft at 9 seconds.
Wed..N winds 5 kt...becoming sw in the afternoon. Wind waves 2 ft or less. NW swell 2 to 4 ft at 10 seconds.
Wed night..W winds 10 kt. Wind waves 2 ft or less. NW swell 2 to 4 ft at 10 seconds.
Thu..SW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 2 to 3 ft at 10 seconds.
Fri..W winds 10 kt. Wind waves 2 ft or less. NW swell 2 to 3 ft.
Sat..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 2 to 3 ft.
PZZ500 251 Am Pdt Tue Sep 26 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A thermal trough over the california interior will shift to the coast resulting in decreasing winds. An upper level trough will approach the pacific northwest Friday increasing the pressure gradients over the area.

7 Day Forecast for Marine Location Near Rio del Mar, CA
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location: 36.96, -121.9     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 261037
afdmtr
area forecast discussion
national weather service san francisco bay area
337 am pdt Tue sep 26 2017

Synopsis Breezy in the hills this morning then turning sunny
and warm to hot again by midday. Another shot of gusty winds again
this evening for the north and east bay hills. Continued warm and
dry on Wednesday which may be the hottest day this week but with
winds easing. Onshore flow gradually returns by Thursday with a
few degrees of cooling followed by more noted cooling Friday and
Saturday as a trough passes to our north. Dry high pressure
rebuilds Sunday into next week.

Discussion As of 3:37 am pdt Tuesday... Skies remain mostly
clear this morning with mild overnight lows around 60 most areas.

Surface gradients currently show a 6 mb pressure gradient down the
coast form arcata to sfo which is a dry northerly flow. The large
scale offshore from the deserts is around 7-8 mb which is only
moderate. This is translating to some gusty winds in the north and
east bay hills with hawkeye in northern sonoma currently gusting
28 mph with 19 mph on mt tamalpais. This all sets the stage for
rapid warming again today as the Sun comes up and the dry airmass
quickly warms up under adiabatic compression off the coastal
hills. The official forecast for today has widespread 80s and 90s
across the bay area.

Models show another shot of east northeast winds in the hills this
evening which will keep fire weather concerns in place due to poor
humidity recovery, mild temps and continued dry offshore winds.

Winds will finally ease on Wednesday but another warm to hot day
is forecast across the region.

Some coastal cooling should become obvious by Thursday as onshore
flow gradually returns to area but inland areas will remain above
normal once again.

The ECMWF nows brings a dry cold front over the bay area by
Friday. This should induce some gusty onshore winds and a possible
return of the marine layer into Saturday. The pattern looks
progressive with high pressure rebuilding by Sunday into early
next week with another thermal trough setting up at the surface.

This should translate too another round of sunny and mild days for
early next week before the next trough knocks temps back down a
few degrees.

Aviation As of 10:27 pm pdt Monday... Offshore winds and dry
conditions supportVFR tonight and Tuesday. Light winds except
gusty in the north bay and east bay mountains hills. Easterly
winds may also become locally gusty along the san mateo coast late
tonight and Tuesday morning.

Vicinity of ksfo...VFR.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR. Light e-se winds tonight. Westerly
winds return Tuesday afternoon and evening.

Fire weather As of 3:37 am pdt Tuesday... Red flag warnings
remain in place for the north and east bay hills into weds.

Humidity remains below 30 percent early this morning with dry
north winds showing up in the hills. Winds forecast to ease
through the daytime hours today but another warm and dry day.

Models show another shot of gusty east northeast winds by this
evening and overnight, strongest in the napa hills. Latest fuels
analysis shows that fuels are around normal in terms of seasonable
dryness but of course this is the driest time of year. However
trend of warmer and drier will continue to dry out the fine and
live fuels. Winds will finally ease on Wednesday but that may be
the hottest and driest day this week. Will need to watch for
return of onshore winds Thursday afternoon for the interior
valleys. Breezy onshore winds Friday and Saturday then warming and
drying again Sunday into early next week.

Marine As of 3:00 am pdt Tuesday... A thermal trough over the
california interior will shift to the coast resulting in
decreasing winds. An upper level trough will approach the pacific
northwest Friday increasing the pressure gradients over the area.

Mtr watches warnings advisories
Tday Sca... Pt arena to pigeon pt 10-60 nm until 3 pm
public forecast: rww
aviation: W pi
marine: W pi
fire weather: rww
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ELXC1 - Elkhorn Slough Reserve, CA 13 mi82 min ENE 2.9 53°F 1009 hPa49°F
46092 - MBM1 16 mi62 min NNE 7.8 59°F 59°F1010.1 hPa (-0.6)
46240 - Cabrillo Point, Monterey Bay, CA (158) 23 mi46 min 63°F2 ft
MEYC1 25 mi91 min W 5.1 G 5.1 60°F 64°F1010.5 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA 29 mi77 min NW 5.8 G 7.8 61°F 61°F7 ft1010.2 hPa (-0.5)
46114 - West Monterey Bay, CA 29 mi67 min 62°F6 ft
RTYC1 - 9414523 - Redwood City, CA 41 mi49 min Calm G 1 62°F 69°F1009.8 hPa
46239 - Point Sur, CA (157) 44 mi67 min 58°F6 ft

Wind History for Monterey, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Watsonville, Watsonville Municipal Airport, CA6 mi74 minNW 610.00 miFair57°F45°F64%1010.5 hPa

Wind History from WVI (wind in knots)
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Last 24hrNW4CalmNW4NW3CalmCalmCalmCalmE4SW7W7SW6SW4SE5S5SE3CalmCalmNW5NW4NW4NW6NW3NW6
1 day agoNW5NW4CalmCalmCalmCalm3CalmS3S9SW8SW6S7SW5SE4SE5SW5CalmNW3NW5NW3NW4NW3NW4
2 days ago--NW4CalmCalmCalmCalmSE3CalmS5S8SW10SW6S8CalmSE3CalmN3NW3CalmNW3NW4NW4NW4NW5

Tide / Current Tables for Santa Cruz, Monterey Bay, California
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Santa Cruz
Click for Map
Tue -- 04:11 AM PDT     3.38 feet High Tide
Tue -- 06:59 AM PDT     Sunrise
Tue -- 08:45 AM PDT     2.61 feet Low Tide
Tue -- 01:00 PM PDT     Moonrise
Tue -- 03:03 PM PDT     4.37 feet High Tide
Tue -- 06:58 PM PDT     Sunset
Tue -- 10:40 PM PDT     0.88 feet Low Tide
Tue -- 11:21 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.72.32.93.23.43.33.12.92.72.62.733.43.94.24.44.23.93.32.51.81.30.90.9

Tide / Current Tables for Point Pinos, California Current
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Point Pinos
Click for Map
Tue -- 02:27 AM PDT     0.50 knots Max Flood
Tue -- 05:52 AM PDT     -0.00 knots Slack
Tue -- 06:59 AM PDT     Sunrise
Tue -- 08:03 AM PDT     -0.38 knots Max Ebb
Tue -- 11:36 AM PDT     0.00 knots Slack
Tue -- 12:59 PM PDT     Moonrise
Tue -- 02:19 PM PDT     0.35 knots Max Flood
Tue -- 05:09 PM PDT     -0.00 knots Slack
Tue -- 06:58 PM PDT     Sunset
Tue -- 08:21 PM PDT     -0.66 knots Max Ebb
Tue -- 11:22 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.10.40.50.50.40.2-0-0.3-0.4-0.3-0.2-0.10.10.20.30.30.20-0.2-0.5-0.6-0.6-0.5-0.3

Weather Map and Satellite Images
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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 (7,2,3,4)
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Ground Weather Radar Station San Francisco Bay Area, CA
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weather_mapweather_map weather_map

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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.