Saturday, December16, 2017 L-36.com


Marine Weather and Tides
Seacliff, 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 7:13AMSunset 4:54PM Saturday December 16, 2017 8:38 AM PST (16:38 UTC) Moonrise 5:40AMMoonset 4:11PM Illumination 3% Phase: Waning Crescent; Moon at 28 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- 300 Am Pst Sat Dec 16 2017
.small craft advisory in effect from 9 am pst this morning through late tonight...
Today..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 7 to 9 ft at 14 seconds.
Tonight..N winds 20 to 30 kt. Wind waves 4 to 6 ft. W swell 9 ft at 14 seconds...shifting to the nw 11 ft at 13 seconds after midnight.
Sun..NE winds 5 to 15 kt...becoming nw in the afternoon. Wind waves 2 ft or less. NW swell 9 to 10 ft at 12 seconds.
Sun night..N winds 10 kt. Wind waves 2 ft or less. W swell 7 to 8 ft at 12 seconds.
Mon..E winds 10 kt. Wind waves 2 ft or less. W swell 5 to 6 ft at 11 seconds.
Tue..W winds 10 kt. Wind waves 2 ft or less. W swell 4 to 6 ft.
Wed..N winds 10 kt. Wind waves 2 ft or less. W swell 5 to 7 ft.
PZZ500 300 Am Pst Sat Dec 16 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Strong and gusty north winds will prevail in the post frontal environment through today and Sunday. The strong and gusty winds will create very steep wind waves and fresh swell, creating very rough and hazardous seas through the majority of the weekend.

7 Day Forecast for Marine Location Near Seacliff, CA
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location: 36.97, -121.91     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 161201
afdmtr
area forecast discussion
national weather service san francisco bay area
401 am pst Sat dec 16 2017

Locally breezy conditions likely through Sunday morning...

Elevated fire danger particularly for higher elevation
locations for the same time...

Synopsis Dry weather will continue into next week. A mainly
dry cold front will sweep south over the area late Friday night
and early Saturday morning which then increases n-ne winds along
the ridges and peaks today.

Discussion As of 3:00 am pst Saturday... Have been keeping a
close eye on surface observations during the midnight shift as
as a system crossed our region yesterday evening. However, so far
only a few locations have been gusting over 30 mph with always
windy mount diablo back under 40 mph. Models continue to show
stronger winds through the morning with greater pressure
gradients and continued caa. 850 mb values off the latest NAM have
a bullseye of nearly 60 kt over the north bay mountains close to
noon. 850 mb speeds for other spots show the potential for 40 to
50 mph. Not clear that we will see speeds that high based on how
current values compare to expected numbers, but feel that caution
remains the best course of action. Therefore, will keep the wind
advisory going into Sunday morning.

Other concern for higher elevations remains for fire weather with
relative humidity readings expected to quickly drop through the
day and barely recover tonight. Would expect spots above 1,000
feet to drop into the 10 to 20% range later today with many likely
to be under 30% for most of the night. Will keep the red flag
warning going.

Synoptically we will see a ridge of high pressure attempt to
rebuild into our region from the west, but that will quickly
flatten as a system approaches from the north. Models have been
flipping between some moisture and no moisture depending on the
expected track. Models are trending farther to the east which
favors drier weather, so pops were decreased. Still looks like an
outside chance for light rainfall mainly over the north bay
Tuesday night. Any amounts will be very light -- less than a tenth
of an inch.

After that a cool, dry, northerly flow will take shape as the
ridge becomes extremely amplified off the coast. That should lock
into place at least through christmas day. For those with travel
plans the end of next week, driving conditions should be ideal.

Aviation As of 3:50 am pst Saturday... For 12z tafs. Patchy low
clouds and fog are developing over inland valleys this
morning... Otherwise mainly clear skies expected to prevail in the
post frontal environment. Strong and gusty northerly winds
expected today. Windy conditions will persist through the weekend.

Sustained winds in the 15 to 25 kt range with gusts from 20 to 30
kt expected across area terminals. Gusty winds also expected over
mountain ridges and through coastal gaps.

High confidence.

Vicinity of ksfo...VFR. Northwesterly winds will strengthen
later this morning in the wake of the front that moved through
last night. Sustained winds in the 15 to 25 kt range with gusts
from 25 to 30 kt expected.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR. Winds will strengthen and become
gusty later this morning. Sustained winds in the 10 to 15 kt
range with gusts around 20 kt expected.

Fire weather As of 3:15 am pst Saturday... A red flag warning
remains in effect through 10 am Sunday. Offshore flow is forecast
to strengthen through the day. Latest models continue to show rh
values dropping through day and poor recoveries Saturday night.

It's fairly common to have lower rh on night number two behind a
front with developing offshore flow. May not technically hit rh
criteria the first part of today, but decided to keep fire
weather concerns going given gusty winds, lack of recent rain,
very low rh (single digits) the last few nights and near record
values of ercs for the N bay mts and santa cruz diablo psas. Areas
of greatest concern will be above 1000 feet. Winds may be a tad
weaker on Saturday night, but rh recoveries worse. For what it's
worth, fire weather concerns are not that unusual for this time of
year. December 16, 2013, a wildfire broke out in big sur called
the pfeiffer fire.

Marine As of 3:00 am pst Saturday... Strong and gusty north
winds will prevail in the post frontal environment through today
and Sunday. The strong and gusty winds will create very steep
wind waves and fresh swell, creating very rough and hazardous
seas through the majority of the weekend.

Mtr watches warnings advisories
Tday Wind advisory... Caz507-511-512-517-518
sca... Pigeon pt to pt pinos 0-10 nm
glw... Pt arena to pigeon pt 10-60 nm
sca... Pt pinos to pt piedras blancas 0-10 nm until 9 am
glw... Pt pinos to pt piedras blancas 0-10 nm from 9 am
glw... Pigeon pt to pt piedras blancas 10-60 nm
sca... Pt arena to pt reyes 0-10 nm from 9 am
glw... Pt arena to pt reyes 0-10 nm until 9 am
sca... Pt reyes to pigeon pt 0-10 nm
sca... Sf bay from 9 am
sca... Mry bay from 9 am
public forecast: bell
aviation marine: cw
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ELXC1 - Elkhorn Slough Reserve, CA 14 mi113 min SSE 1.9 46°F 1012 hPa46°F
46092 - MBM1 16 mi88 min NW 14 56°F 58°F1012.5 hPa (-0.8)
46240 - Cabrillo Point, Monterey Bay, CA (158) 24 mi47 min 57°F8 ft
MEYC1 25 mi62 min WSW 4.1 G 7 54°F
46042 - MONTEREY - 27NM West of Monterey Bay, CA 29 mi48 min NNW 27 G 33 56°F 58°F15 ft1012.1 hPa (-0.9)
46114 - West Monterey Bay, CA 29 mi38 min 58°F16 ft
RTYC1 - 9414523 - Redwood City, CA 40 mi50 min 53°F
46239 - Point Sur, CA (157) 45 mi38 min 56°F16 ft

Wind History for Monterey, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Watsonville, Watsonville Municipal Airport, CA7 mi45 minN 01.00 miFog/Mist43°F43°F100%1012.8 hPa

Wind History from WVI (wind in knots)
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Last 24hrCalmCalmSE3NE3CalmW3SW4SW4CalmCalmNE3N3NE3N3NW3CalmCalmNW6NW5CalmCalmCalmE3Calm
1 day agoCalmE3CalmS3E5NW4CalmNW3NW3NW4NW4NW3W3NW4NW4NW3CalmW3CalmCalmCalmW3W3Calm
2 days agoCalmCalmE3CalmCalm3W4SW3CalmCalmCalmNW4NW3NW3CalmCalmNW3CalmCalmW4CalmNW33Calm

Tide / Current Tables for Santa Cruz, Monterey Bay, California
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Santa Cruz
Click for Map
Sat -- 02:20 AM PST     2.47 feet Low Tide
Sat -- 05:39 AM PST     Moonrise
Sat -- 07:14 AM PST     Sunrise
Sat -- 08:34 AM PST     5.88 feet High Tide
Sat -- 03:49 PM PST     -0.19 feet Low Tide
Sat -- 04:11 PM PST     Moonset
Sat -- 04:52 PM PST     Sunset
Sat -- 10:25 PM PST     3.91 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.22.72.52.633.74.55.35.85.85.34.43.11.80.7-0-0.20.20.91.92.83.53.93.9

Tide / Current Tables for Point Pinos, California Current
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Point Pinos
Click for Map
Sat -- 01:39 AM PST     -0.43 knots Max Ebb
Sat -- 04:56 AM PST     0.00 knots Slack
Sat -- 05:38 AM PST     Moonrise
Sat -- 07:13 AM PST     Sunrise
Sat -- 07:45 AM PST     0.53 knots Max Flood
Sat -- 10:33 AM PST     -0.00 knots Slack
Sat -- 01:45 PM PST     -0.88 knots Max Ebb
Sat -- 04:12 PM PST     Moonset
Sat -- 04:53 PM PST     Sunset
Sat -- 05:47 PM PST     0.00 knots Slack
Sat -- 08:55 PM PST     0.70 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.2-0.4-0.4-0.4-0.200.30.50.50.40.2-0.2-0.6-0.8-0.9-0.8-0.6-0.30.10.40.60.70.60.4

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 (11,2,3,4)
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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.