Wednesday, July17, 2019 L-36.com


Marine Weather and Tides
Seacliff, CA

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6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:00AMSunset 8:27PM Wednesday July 17, 2019 9:20 AM PDT (16:20 UTC) Moonrise 8:18PMMoonset 5:39AM Illumination 100% Phase: Full Moon; Moon at 15 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- 849 Am Pdt Wed Jul 17 2019
Today..W winds 5 to 10 kt. Wind waves 3 to 4 ft. SWell S around 3 ft at 17 seconds.
Tonight..SW winds 5 to 10 kt. Wind waves 3 to 4 ft.
Thu..SW winds 5 to 10 kt. Wind waves around 3 ft.
Thu night..SW winds 5 to 10 kt. Wind waves around 3 ft.
Fri..SW winds 10 to 15 kt. Wind waves 3 to 4 ft.
Fri night..SW winds 5 to 10 kt. Wind waves 3 to 4 ft.
Sat..SW winds 5 to 10 kt. Wind waves around 3 ft.
Sun..W winds 5 to 10 kt. Wind waves around 3 ft. Locally lower winds and seas across sheltered portions of the bay.
PZZ500 849 Am Pdt Wed Jul 17 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate northwest winds across the waters north of point reyes through tomorrow, with lighter northwest winds elsewhere. Wind driven northwest seas will be locally steep and hazardous to small craft vessels. Light long period southerly swell will continue to be the dominant swell group through at least Thursday.


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 171600
afdmtr
area forecast discussion
national weather service san francisco bay area
900 am pdt Wed jul 17 2019

Synopsis Slight cooling is forecast for most areas today. More
significant cooling is expected on Thursday and Friday,
especially inland. Also, night and morning low clouds will become
more widespread over the next few days. Temperatures will begin
to increase by late in the weekend, but likely remain below
seasonal averages through Sunday. Temperatures are then expected
to warm to about average, or slightly above average, next week.

Discussion As of 08:59 am pdt Wednesday... Stratus which spread
inland overnight continues to dissipate this morning with
temperatures running in the upper 50s to lower 60s. As mentioned
in the previous discussion, the deeper marine layer in place and
weak onshore flow should allow for slightly cooler conditions
across the region this afternoon. However, mostly sunny conditions
are likely region-wide with the coolest conditions near the coast
(60s to middle 70s in the warmer locations) with more widespread
80s inland (lower 90s in the warmest interior locations). With
this said, no significant changes to the ongoing forecast other
than minor adjustments to sky cover based on latest satellite
imagery. For additional details, please read the previous forecast
discussion below.

Prev discussion As of 4:00 am pdt Wednesday... The fort ord
profiler indicated a rapid deepening of the marine layer last
evening. Based on current satellite imagery, the depth of the
marine layer is likely between 1500 and 2000 feet. Low clouds have
developed as far inland as the pacheco pass, but inland
development farther to the north across the sf bay area has been
somewhat limited. This is likely due to the fact that a moderate
4.5 mb pressure gradient remains in place from acv to sfo. The
temperature forecast for today is rather tricky. On the one hand,
a deeper marine layer should mean much cooler temperatures. But on
the other hand, onshore flow remains weak and the models forecast
slight warming of the airmass aloft by this afternoon. The most
likely outcome will be slightly cooler temperatures in most areas
today.

The northerly surface gradient is forecast to weaken tonight which
should result in more widespread inland development of low clouds
by Thursday morning. Meanwhile, an upper trough currently
settling into the pacific northwest is forecast to sag slowly south
into northern california tomorrow through Friday, resulting in
further deepening of the marine layer. In addition, the models
develop a low level cyclonic circulation center off the north bay
coast by tomorrow afternoon, and then maintain a weak surface low
off our coast through the end of the week. The resulting
southerly low level flow along our coast will more efficiently
transport marine air inland tomorrow and Friday. Thus, more
significant cooling is expected over the next two days,
particularly in areas that cool more readily during southerly
flow such as the north bay valleys and santa cruz county. Some
inland areas may cool by as much as 15 degrees by Friday and low
clouds will likely linger into the afternoon hours in some areas.

The upper trough to our north is forecast to move to the east by
the weekend, which will allow for modest warming by Sunday. Even
so, temperatures will likely remain at least slightly cooler than
seasonal averages through the upcoming weekend.

In the longer range, the GFS and ECMWF agree that an upper ridge
will quickly amplify across the west early next week, with the
ridge axis aligned from the four corners northward to the
northern rockies. Heights will rise as far west as california as
this ridge strengthens, but a trough offshore along 140w is
expected to prevent the ridge from expanding more strongly over
california as had been previously forecast. Thus, the amount of
inland warming next week now looks to be rather modest, with
temperatures expected to warm only slightly above seasonal
averages.

Aviation As of 4:45 am pdt Wednesday... Ft ord profiler shows
the marine layer is becoming less defined. This is in response to
an upper trough moving through the area cooling the airmass aloft.

There is also a low level cyclonic circulation at 925 mb over the
area which is bringing in a drier northerly flow. Stratus which
came in earlier is now starting to retreat in response to this
drier flow. Thus we should seeVFR conditions for sfo and the
approach today with just some early morning scattered clouds near
the airport. Stratus is more organized in the mry bay area and
there could be some morning drizzle as well.

Vicinity of ksfo...VFR expected today. Could see a light north to
northeast wind this morning up to 6 kt. West winds gusting up to
25 kt after 22z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Ifr CIGS with patchy drizzle through 17z.

Becoming MVFR until 19z.

Marine As of 08:59 am pdt Wednesday... Moderate northwest winds
across the waters north of point reyes through tomorrow, with
lighter northwest winds elsewhere. Wind driven northwest seas will
be locally steep and hazardous to small craft vessels. Light long
period southerly swell will continue to be the dominant swell
group through at least Thursday.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pigeon pt 10-60 nm
sca... Pt arena to pt reyes 0-10 nm until 3 am
sca... Pigeon pt to pt piedras blancas 10-60 nm until 9 pm
public forecast: rgass dykema
aviation: W pi
marine: drp
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MLSC1 - Moss Landing, South Harbor, CA 13 mi76 min SW 4.1 G 12 57°F 1014.3 hPa55°F
ELXC1 - Elkhorn Slough Reserve, CA 14 mi95 min SW 4.1 58°F 1014 hPa56°F
46092 - MBM1 16 mi67 min SSW 1.9 55°F 53°F1013.7 hPa (+0.6)
46240 - Cabrillo Point, Monterey Bay, CA (158) 24 mi20 min 59°F2 ft
MEYC1 25 mi44 min 60°F1014 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA 29 mi30 min NNW 9.7 G 12 56°F 56°F5 ft1013.2 hPa (+0.5)
46114 - West Monterey Bay, CA 29 mi20 min 55°F6 ft
RTYC1 - 9414523 - Redwood City, CA 40 mi50 min E 1.9 G 2.9 63°F 73°F1013.4 hPa
46239 - Point Sur, CA (157) 44 mi20 min 53°F5 ft

Wind History for Monterey, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Watsonville, Watsonville Municipal Airport, CA7 mi27 minSE 310.00 miOvercast59°F54°F83%1013.9 hPa

Wind History from WVI (wind in knots)
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Last 24hr4Calm5S8S8SE9S6S6SE5S6S5SE6S4E6CalmNE3E4E4S3S3CalmSE4E3SE3
1 day ago3SW4S8S7S7S6S7S7S7S5S6S7SE4SE3E3E3CalmCalmCalmCalmSE3E4CalmCalm
2 days ago3S6S6S8S6SE7S8S8S7S7S6S3CalmCalmCalmCalmCalmW3CalmNW3CalmCalmCalmCalm

Tide / Current Tables for Santa Cruz, Monterey Bay, California
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Santa Cruz
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Wed -- 05:44 AM PDT     -0.71 feet Low Tide
Wed -- 06:01 AM PDT     Sunrise
Wed -- 06:39 AM PDT     Moonset
Wed -- 12:48 PM PDT     4.25 feet High Tide
Wed -- 05:36 PM PDT     2.92 feet Low Tide
Wed -- 08:26 PM PDT     Sunset
Wed -- 09:18 PM PDT     Moonrise
Wed -- 11:14 PM PDT     5.45 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.14.12.71.30.1-0.6-0.7-0.30.51.42.53.54.14.243.63.232.93.33.84.55.15.4

Tide / Current Tables for Point Pinos, California Current
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Point Pinos
Click for Map
Wed -- 12:45 AM PDT     -0.00 knots Slack
Wed -- 04:03 AM PDT     -0.98 knots Max Ebb
Wed -- 06:02 AM PDT     Sunrise
Wed -- 06:39 AM PDT     Moonset
Wed -- 08:02 AM PDT     0.00 knots Slack
Wed -- 11:10 AM PDT     0.77 knots Max Flood
Wed -- 02:24 PM PDT     -0.00 knots Slack
Wed -- 04:38 PM PDT     -0.45 knots Max Ebb
Wed -- 07:53 PM PDT     0.00 knots Slack
Wed -- 08:25 PM PDT     Sunset
Wed -- 09:17 PM PDT     Moonrise
Wed -- 10:38 PM PDT     0.53 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.3-0.1-0.5-0.9-1-0.9-0.7-0.4-00.40.70.80.70.50.2-0.2-0.4-0.4-0.4-0.200.30.50.5

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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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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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.