Friday, August18, 2017 L-36.com


Marine Weather and Tides
Twin Lakes, 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 6:27AMSunset 7:56PM Friday August 18, 2017 9:18 AM PDT (16:18 UTC) Moonrise 2:05AMMoonset 4:40PM Illumination 14% Phase: Waning Crescent; Moon at 26 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- 827 Am Pdt Fri Aug 18 2017
Today..SW winds 5 kt...becoming W 5 to 15 kt in the afternoon. Wind waves 2 ft or less. W swell 3 to 4 ft at 12 seconds. Patchy fog late in the morning.
Tonight..SW winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 3 to 4 ft at 11 seconds. Patchy fog after midnight.
Sat..W winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 3 ft at 11 seconds. Patchy fog in the morning.
Sat night..SW winds 10 kt. Wind waves 2 ft or less. W swell 3 ft at 11 seconds. Patchy fog after midnight.
Sun..SW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 ft at 11 seconds. Patchy fog.
Mon..SW winds 10 kt. Wind waves 2 ft or less. NW swell 3 ft.
Tue..W winds 10 kt. Wind waves 2 ft or less. NW swell 3 ft.
PZZ500 827 Am Pdt Fri Aug 18 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Expect increasing northwesterly winds to continue through the weekend as high pressure builds over the eastern pacific. Locally steep wind waves will also accompany the increasing winds.

7 Day Forecast for Marine Location Near Twin Lakes CDP, CA
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location: 36.83, -122.01     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 181502
afdmtr
area forecast discussion
national weather service san francisco bay area
802 am pdt Fri aug 18 2017

Synopsis Look for one more day of minor warming today as a
ridge of high pressure continues to build into our region. Minor
cooling can be expected over the weekend into next week as an
upper level low and shortwave trough move into our region.

Overnight clouds can be expected especially along the coast.

Discussion As of 08:02 am pdt Friday... Only a few minor
adjustments made to this morning's forecast as the low clouds
have managed to progress inland. Livermore, for example, recently
transitioned from clear skies to overcast conditions. Additionally,
low clouds managed to make it to san francisco international
airport with bkn ovc conditions reported over the past hour. Do
expect clearing by mid late morning for most locations today with
mostly clear skies for the afternoon. With a building ridge just
offshore, this morning's 12z oakland sounding shows increasing 500
mb heights compared to 24 hours ago. At 850 mb, temps have warmed
by about 3 deg c. As a result, this will translate to several
degrees of warming at the surface this afternoon for most interior
areas. High temperatures will be generally in the 60s and 70s
along the coast and 80s and 90s for inland communities.

For additional forecast details, please refer to the previous
discussion section.

Prev discussion As of 3:00 am pdt Friday... For the first time in
quite awhile, satellite shows that clouds are fairly limited
across our region with even monterey bay cloud-free at this hour.

Satellite does show clouds finally advancing toward the coast and
with a westerly gradient nearly 3 mb, we should see them at least
advance to the coast before sunrise. Synoptically a ridge of high
pressure will move across our region today which will lead to a
few degrees of warming. Temperatures will be in the 60s and 70s at
the coast with 80s and 90s inland.

The ridge will be replaced by an upper level low and a shortwave
trough that will dive down from the north. This will lead to
cooling over the weekend and next week with most spots dropping 5
to 10 degrees. Clouds will also be likely each night especially
near the coast. Big question will be how much the marine layer
will change with the low overhead. Could be a case of the marine
layer mixing out. Regardless, next week is shaping up to be very
quiet with temperatures near normal.

Aviation As of 4:55 am pdt Friday... High pressure continues to
compress the marine layer this morning with tops now down to 1500
ft. The marine layer struggled to push inland overnight with MVFR
or lower CIGS only at koak ksjc and ksfo this morning withVFR
elsewhere. Satellite imagery shows the marine layer is deepest
and most continuous across the north bay (ie ovc004 at ksts)
while kmry and ksns remain clear. Latest imagery shows the marine
layer rapidly approaching coastal monterey bay as of 5am and
expect to see ifr to MVFR CIGS develop there around sunrise before
mixing out early this morning. Most forecast models indicate the
stratus deck will rebound slightly tonight with a thicker depth
and more widespread coverage than this morning.

Vicinity of ksfo... PredominatelyVFR with brief MVFR posbl around
sunrise as marine layer reaches morning maxima. Breezy onshore
winds in the afternoon. MVFR late tonight through sunrise
tomorrow.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR through early this morning with ifr
cigs from sunrise through mid morning. Marine deck increases
tonight.

Marine As of 04:42 am pdt Friday... Increasing northwest winds
through the weekend as high pressure builds into the region.

Locally steep wind waves will accompany the increasing winds.

Mtr watches warnings advisories
Tday None.

Public forecast: rowe bell
aviation: drp
marine: drp
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46092 - MBM1 6 mi77 min NW 1.9 59°F 59°F1016.4 hPa (+0.6)
ELXC1 - Elkhorn Slough Reserve, CA 14 mi94 min Calm 59°F 1016 hPa58°F
46240 - Cabrillo Point, Monterey Bay, CA (158) 15 mi58 min 56°F2 ft
MEYC1 17 mi49 min N 1 G 1.9 58°F 56°F1016.8 hPa
46114 - West Monterey Bay, CA 20 mi49 min 60°F6 ft
46042 - MONTEREY - 27NM West of Monterey Bay, CA 21 mi89 min NNW 3.9 G 3.9 60°F 60°F5 ft1016.3 hPa (+0.4)
46239 - Point Sur, CA (157) 34 mi57 min 60°F6 ft
RTYC1 - 9414523 - Redwood City, CA 48 mi49 min Calm G 2.9 62°F 72°F1016 hPa

Wind History for Monterey, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Watsonville, Watsonville Municipal Airport, CA14 mi26 minN 07.00 miOvercast60°F57°F93%1016.9 hPa
Monterey Regional Airport, CA19 mi25 minN 07.00 miOvercast61°F57°F87%1017.9 hPa
Salinas, Salinas Municipal Airport, CA24 mi26 minN 07.00 miA Few Clouds62°F57°F84%1017.3 hPa

Wind History from WVI (wind in knots)
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Last 24hrS4S7SW86W7SW9SW8SW8S8SW5SW5CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmN3N3Calm
1 day agoSW4S4S5SW8SW7SW10SW9SW8SW7W8SW5SW3CalmCalmCalmCalmCalmCalmCalmN3CalmCalmCalmCalm
2 days agoSW5SW8SW9S10SW10SW10
G16
S12SW8SW6SW5S5S4E5E4E5E3NE3CalmW3CalmCalmCalmCalmSW3

Tide / Current Tables for Santa Cruz, Monterey Bay, California (sub)
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Santa Cruz
Click for Map
Fri -- 02:32 AM PDT     -0.39 feet Low Tide
Fri -- 03:05 AM PDT     Moonrise
Fri -- 06:27 AM PDT     Sunrise
Fri -- 09:13 AM PDT     3.89 feet High Tide
Fri -- 01:50 PM PDT     2.32 feet Low Tide
Fri -- 05:40 PM PDT     Moonset
Fri -- 07:55 PM PDT     Sunset
Fri -- 08:10 PM PDT     6.10 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.30.3-0.3-0.30.1122.93.63.93.83.42.92.52.32.63.24.155.76.15.95.13.9

Tide / Current Tables for Point Pinos, California Current
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Point Pinos
Click for Map
Fri -- 12:31 AM PDT     -0.93 knots Max Ebb
Fri -- 03:05 AM PDT     Moonrise
Fri -- 04:37 AM PDT     0.00 knots Slack
Fri -- 06:27 AM PDT     Sunrise
Fri -- 07:46 AM PDT     0.73 knots Max Flood
Fri -- 10:57 AM PDT     -0.00 knots Slack
Fri -- 01:14 PM PDT     -0.45 knots Max Ebb
Fri -- 04:31 PM PDT     0.00 knots Slack
Fri -- 05:39 PM PDT     Moonset
Fri -- 07:24 PM PDT     0.58 knots Max Flood
Fri -- 07:54 PM PDT     Sunset
Fri -- 10:15 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.9-0.9-0.8-0.6-0.20.10.50.70.70.60.4-0-0.3-0.5-0.4-0.3-0.10.10.40.60.60.40.1-0.3

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 (12,3,4,5)
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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.