Wednesday, September19, 2018 L-36.com


Marine Weather and Tides
Rio del Mar, CA

Version 3.4
What's New / NOTES
9/17/2018 XTide broke when 1and1 "upgraded" my server. It has been esculated. I am sorry for the problem.

Sunrise 6:52AMSunset 7:09PM Wednesday September 19, 2018 7:12 PM PDT (02:12 UTC) Moonrise 3:23PMMoonset 12:45AM Illumination 76% Phase: Waxing Gibbous; Moon at 10 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- 215 Pm Pdt Wed Sep 19 2018
.small craft advisory in effect until 9 pm pdt this evening...
Tonight..W winds 10 to 20 kt...becoming north 5 kt after midnight. Wind waves 3 to 4 ft in the evening...becoming 2 ft or less. W swell 4 to 6 ft at 10 seconds.
Thu..NW winds 5 kt...becoming W 10 to 20 kt in the afternoon. Waves 1 to 3 ft. W swell 3 to 5 ft at 11 seconds.
Thu night..SW winds 10 to 20 kt...becoming north 5 kt after midnight. Wind waves 3 ft in the evening...becoming 2 ft or less. W swell 3 to 5 ft at 10 seconds.
Fri..W winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 3 to 4 ft at 10 seconds.
Fri night..SW winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 3 ft at 10 seconds.
Sat..W winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 3 ft.
Sun..NW winds 10 kt. Wind waves 2 ft or less. W swell 3 ft.
Mon..NW winds 10 kt. Wind waves 2 ft or less. W swell 3 ft.
PZZ500 215 Pm Pdt Wed Sep 19 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure to the north and low pressure to the south will keep breezy to gusty northerly winds along the central coast through Thursday evening. Gusty winds will generate steep wind waves creating hazardous sea conditions, especially for smaller vessels. Winds will then diminish late this week as the high pressure weakens and the thermal trough shifts towards the coast.


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 200009
afdmtr
area forecast discussion
national weather service san francisco bay area
509 pm pdt Wed sep 19 2018

Synopsis A warming and drying trend will continue into
Thursday as onshore flow weakens and a brief period of offshore
flow begins. Gusty northerly winds in higher elevations will
result in enhanced fire weather concerns from tonight into
Thursday morning, mainly in the north and east bay mountains and
the santa cruz mountains. Temperatures are expected to moderate
slightly over the upcoming weekend but will remain near to
slightly above seasonal averages as we head into next week.

Discussion As of 1:46 pm pdt Wednesday... The marine layer has
lowered to around 1000 feet per the fort ord profiler output, as
high pressure aloft begins to nudge into the state. Skies have
cleared except for a stubborn patch of low clouds clinging to the
monterey peninsula. Most temperatures are running warmer than
yesterday by several degrees, santa rosa is 10 degrees warmer at
79 degrees! Coastal areas are about the same as yesterday with
upper 50s to mid 60s currently. The northerly surface pressure
gradient continues to tighten with acv-sfo now nearing 6 mb. The
onshore component remains fairly weak with 1 mb from sfo to sac.

The northerly gradient will result in increasing offshore winds
over the higher hills from santa cruz county northward. See below
for how this will affect fire weather.

High pressure aloft will edge into california from the west. This
will usher in a warming trend over the next few days, peaking on
Thursday when high temperatures are forecast to warm into the 90s
across the warmest inland areas, with 60s and 70s along the
coast. Slight cooling is expected over the weekend as an upper
level trough moves across the pacific northwest.

Medium range model runs still indicating a return of high
pressure over the eastern pacific early next week. This will
maintain high temperatures in the around normal or slightly above
normal range.

Aviation As of 5:05 pm pdt Wednesday... Increasing offshore flow
will keep clearVFR conditions in the sfo bay area through
Thursday. Models indicate some low-level moisture could produce
late night clouds in southern mry bay late tonight but given that
clouds were disorganized this morning and the drying trend latest
forecast keepsVFR in the mry bay area. Gusty winds over the north
and east bay hills may produce llws around oak above 2000 feet
Thursday morning.

Vicinity of ksfo...VFR. West winds to 20 kt through 04z.

Sfo bridge approach... .Similar to sfo.

Monterey bay terminals... .Vfr.

Fire weather A tightening northerly surface pressure gradient
will produce gusty winds across the north bay mountains, the east
bay hills and diablo range, and the santa cruz mountains. This
coupled with very poor relative humidity recoveries overnight and
already dry fuels will elevate fire weather concerns in these
areas. A red flag warning has been issued for these areas
beginning tonight at 11 pm and going through 5 pm on Thursday.

Winds will begin diminishing during the day, but continued breezy
conditions and low daytime relative humidity values justify
keeping the rfw through the day. Weaker offshore winds are
expected on Friday, and the flow will return to onshore over the
weekend.

Marine As of 05:03 pm pdt Wednesday... High pressure to the
north and low pressure to the south will keep breezy to gusty
northerly winds along the central coast through Thursday evening.

Gusty winds will generate steep wind waves creating hazardous sea
conditions, especially for smaller vessels. Winds will then
diminish late this week as the high pressure weakens and the
thermal trough shifts towards the coast.

Mtr watches warnings advisories
Tngt Sca... Pt reyes to pigeon pt 0-10 nm until 3 am
sca... Pigeon pt to pt pinos 0-10 nm until 3 am
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pt arena to pt reyes 0-10 nm
sca... Mry bay until 9 pm
public forecast: sims
aviation: W pi
marine: mm
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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 mi88 min SW 5.1 62°F 1010 hPa55°F
46092 - MBM1 16 mi68 min WNW 16 56°F 54°F1009.4 hPa (-1.9)
46240 - Cabrillo Point, Monterey Bay, CA (158) 23 mi52 min 58°F3 ft
MEYC1 25 mi97 min WNW 2.9 G 6 60°F 59°F1010.9 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA 29 mi83 min NNW 21 G 27 57°F 55°F9 ft1009.2 hPa (-2.0)
46114 - West Monterey Bay, CA 29 mi43 min 55°F9 ft
RTYC1 - 9414523 - Redwood City, CA 41 mi43 min NNW 5.1 G 7 72°F 70°F1010.3 hPa
46239 - Point Sur, CA (157) 44 mi43 min 55°F8 ft

Wind History for Monterey, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Watsonville, Watsonville Municipal Airport, CA6 mi20 minS 510.00 miFair59°F52°F78%1010 hPa

Wind History from WVI (wind in knots)
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Last 24hrSE6E5E5E3CalmCalmCalmW3W3CalmNE3NE3NE3N3CalmCalmS4SW8SW9SW8SW7S6S6S5
1 day agoSE5E6NE3N3CalmN4N4CalmNW3CalmNW3N3CalmCalm33SW95SW8SW5--S6SE6SE7
2 days agoS5CalmCalmN3N3CalmNW6NW4NW3N3CalmN3CalmCalmCalmCalmSW9SW6S8SE7SE6SE7SE6E5

Tide / Current Tables for Santa Cruz, Monterey Bay, California
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Point Pinos, California Current
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


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 (22,6,7,8)
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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.