Friday, July28, 2017 L-36.com


Marine Weather and Tides
Loyola, 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 6:09AMSunset 8:20PM Friday July 28, 2017 10:02 AM PDT (17:02 UTC) Moonrise 10:49AMMoonset 10:51PM Illumination 26% Phase: Waxing Crescent; Moon at 5 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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PZZ560 Pigeon Point To Point Pinos To 10 Nm- 831 Am Pdt Fri Jul 28 2017
.small craft advisory in effect from 1 pm pdt this afternoon through this evening...
Today..NW winds 10 to 20 kt...increasing to 15 to 25 kt in the afternoon. Wind waves 4 to 6 ft. NW swell 4 to 5 ft at 9 seconds. Patchy fog late in the morning.
Tonight..NW winds 15 to 25 kt...decreasing to 5 to 15 kt after midnight. Wind waves 4 to 6 ft. NW swell 5 to 6 ft at 8 seconds. Patchy fog after midnight.
Sat..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 4 to 6 ft at 8 seconds. Patchy fog in the morning.
Sat night..W winds 5 to 15 kt. Wind waves 1 to 3 ft. Mixed swell nw 3 to 4 ft at 8 seconds and S 3 ft at 14 seconds. Patchy fog after midnight.
Sun..W winds 10 kt. Wind waves 2 ft or less. Mixed swell nw 3 to 4 ft at 8 seconds and S 3 to 4 ft at 14 seconds. Patchy fog in the morning.
Mon..W winds 10 kt. Wind waves 2 ft or less. Mixed swell nw 3 to 5 ft and S 3 to 4 ft.
Tue..W winds 10 kt. Wind waves 2 ft or less. Mixed swell nw 3 to 4 ft and S 3 to 4 ft.
PZZ500 831 Am Pdt Fri Jul 28 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Coastal thermal troughing along the northern california coast will continue to interact with high pressure offshore and produce moderate to locally strong northwesterly winds through late tonight. These winds will produce steep wind waves and fresh swell. Two tropical systems in the pacific will produce a long period southerly swell to arrive over the weekend. Interaction between the northwesterly wind waves and southerly swell will create choppy conditions across the waters.

7 Day Forecast for Marine Location Near Loyola, CA
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location: 37.29, -122.14     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 281627
afdmtr
area forecast discussion
national weather service san francisco bay area
927 am pdt Fri jul 28 2017

Synopsis Slightly cooler temperatures are forecast for today
and Saturday as a weak upper trough approaches the northern
california coast. Even so, most inland areas will remain warm. A
gradual warming trend is then forecast from Sunday through much of
next week as a high pressure ridge strengthens over the western
united states. Thus, expect a prolonged period of very warm
temperatures inland. Mild conditions will persist near the coast.

Discussion As of 9:20 am pdt Friday... Satellite imagery shows
a deck of marine stratus banked along the entire california coast
early this morning. The northerly gradient overruled the weaker
onshore gradient overnight, introducing a deeper stratus intrusion
over the monterey bay salinas valley than around the san francisco
bay area. The stratus deck is now gradually retreating offshore
with overcast conditions expected to persist for immediate coastal
areas through late morning. Temperatures today are starting off
slightly warmer than yesterday but are expected to be cooler
overall for the afternoon and evening hours as a result of an
approaching short wave trough.

The fort ord profiler has also registered a slight deepening in
the marine layer as a result of the trough moving into the
vicinity of our region. Further deepening of the marine layer is
anticipated tonight while the trough passes through, leading to
increased cloud cover and marginally cooler temperatures for
Saturday with 60s to 70s near the coast but 80s to 90s further
inland. The warmest inland locations could once again reach 100
degrees on Saturday despite the slight cooling trend.

A broad upper ridge will backbuild into california from farther
east, bringing a gradual warming trend to the state. Inland
portions of the state will heat up quickly, while the heat will be
buffered by our relatively proximity to the coast closer to home.

That said, the inland valley and higher elevation locations
surrounding the san francisco and monterey bay areas will
generally run in the 90s to 100s for much of next week.

Temperatures are currently forecast to be slightly cooler than
some of the previous heat episodes experienced earlier this
summer, however, the forecast could change as the data comes into
better focus. The main focus of todays forecast package will be to
evaluate the magnitude of the upcoming heat in the model data and
any real life impacts that will be associated with this heat.

Previous discussion As of 3:15 am pdt Friday... Satellite
imagery shows less inland low cloud coverage compared to 24 hours
ago although stratus is extending well down the salinas valley at
this time. The marine layer depth is more shallow - around 1000
feet deep per the fort ord profiler, and surface pressure
gradients are about the same onshore with 2.3 mb from sfo to sac,
but much stronger from north-to-south with 5.4 mb from acv to sfo.

This type of gradient pattern lends itself to more clouds pushing
into the monterey bay and salinas valley and fewer clouds working
into the san francisco bay.

Meanwhile, a weak upper level trough is forecast to approach the
coast today which is expected to deepen the marine layer a little
today and tomorrow. Inland locations are expected to see similar
warmth to yesterday, with plenty of upper 80s and 90s for highs
today. Near-coastal areas could see a couple of degrees of
cooling depending on the strength of the sea breeze this
afternoon. Saturday is expected to be slightly cooler as the weak
trough moves through.

A strong ridge of high pressure currently centered over the rocky
mountain states will build and gradually shift to the west
beginning on Sunday and through the coming week. This will bring
warmer temperatures to the district through the remainder of the
forecast period. The ridge is progged to strengthen during the
latter part of next week for very warm to hot temperatures
across inland areas.

Aviation As of 4:56 am pdt Friday... For 12z tafs. Low clouds
have filled in along the coast this morning. A shallow marine
layer around 800 ft will keep low clouds confined to the coast and
terminals mainly cloud free with the exception of monterey bay
terminals. Light westerly flow will ramp up this afternoon.

Vicinity of ksfo...VFR conditions will prevail. Light to moderate
westerly winds expected to ramp up to 15 to 20 kt this afternoon.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Lifr CIGS expected through the morning
hours with low clouds expected to scatter out around 16z. Light
winds.

Marine As of 09:08 am pdt Friday... Coastal thermal troughing
along the northern california coast will continue to interact
with high pressure offshore and produce moderate to locally strong
northwesterly winds through late tonight. These winds will
produce steep wind waves and fresh swell. Two tropical systems in
the pacific will produce a long period southerly swell to arrive
over the weekend. Interaction between the northwesterly wind
waves and southerly swell will create choppy conditions across
the waters.

Mtr watches warnings advisories
Tday Sca... Mry bay from 1 pm
sca... Pigeon pt to pt pinos 0-10 nm from 1 pm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Sf bay
public forecast: drp
aviation: cw
marine: cw
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 15 mi45 min N 7 G 8.9 62°F 73°F1013.4 hPa
AAMC1 - 9414750 - Alameda, CA 34 mi45 min W 7 G 9.9 56°F 68°F1014.6 hPa
LNDC1 36 mi51 min WSW 4.1 G 7 56°F 1014.2 hPa
OBXC1 37 mi45 min 56°F 55°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 37 mi45 min WSW 6 G 8.9
OKXC1 - 9414776 - Oakland (Berth 34), CA 37 mi45 min SSW 4.1 G 8 56°F 1014.2 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 38 mi51 min W 6 G 12 55°F 1013.1 hPa
46092 - MBM1 38 mi65 min WNW 7.8 53°F 57°F1014 hPa (+1.2)
PXSC1 38 mi45 min 56°F 55°F
46042 - MONTEREY - 27NM West of Monterey Bay, CA 38 mi73 min 55°F 55°F9 ft1014.4 hPa (+1.3)
ELXC1 - Elkhorn Slough Reserve, CA 39 mi78 min SSW 4.1 55°F 1014 hPa55°F
FTPC1 - 9414290 - San Francisco, CA 40 mi45 min SSW 5.1 G 12 54°F 59°F1014.3 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 40 mi73 min NW 16 G 18 55°F 56°F10 ft1014.3 hPa (+1.3)
46114 - West Monterey Bay, CA 41 mi33 min 56°F8 ft
46237 - San Francisco Bar, CA (142) 43 mi63 min 58°F7 ft
PPXC1 - 9414847 - Richmond (Point Potrero), CA 44 mi45 min S 16 G 19 55°F 1014.2 hPa
RCMC1 - 9414863 - Richmond, CA 46 mi45 min S 8.9 G 12 56°F 64°F1013.6 hPa
46240 - Cabrillo Point, Monterey Bay, CA (158) 48 mi42 min 57°F4 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 49 mi73 min NW 16 G 19 53°F 54°F8 ft1014 hPa (+1.1)
MEYC1 49 mi87 min SW 5.1 G 7 55°F 59°F1014.9 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mountain View, Moffett Field, CA11 mi67 minNNW 59.00 miOvercast64°F59°F84%1014.2 hPa
San Jose, San Jose International Airport, CA12 mi70 minWNW 37.00 miA Few Clouds67°F60°F79%1013.4 hPa
Palo Alto Airport, CA13 mi2.3 hrsNW 510.00 miMostly Cloudy63°F59°F88%1013.5 hPa
San Jose / Reid / Hillv, CA17 mi3.3 hrsNNW 510.00 miClear63°F57°F83%1013.9 hPa
San Carlos Airport, CA18 mi73 minVar 310.00 miA Few Clouds64°F57°F78%1013.9 hPa
Half Moon Bay Airport, CA24 mi68 minNNW 53.00 miFog/Mist54°F53°F100%1014.2 hPa

Wind History from NUQ (wind in knots)
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Last 24hrN6N5N6N7N9N10NW9N8NW8NW9N7N4NW4NW5CalmNW3NW5W3NW3W3CalmCalmN5N5
1 day agoNE4N9
G15
N9N7N9N8N11N10NW12NW11NW6W4NW6NW6W4NW3CalmCalmCalmNE3CalmS3E4N3
2 days ago4N7N7N10N11N14N15
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N10N11N10N10N7N6N5N4NW3N4N4N3CalmN3N6N4

Tide / Current Tables for Palo Alto Yacht Harbor, California
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Palo Alto Yacht Harbor
Click for Map
Fri -- 04:53 AM PDT     7.48 feet High Tide
Fri -- 06:09 AM PDT     Sunrise
Fri -- 11:48 AM PDT     Moonrise
Fri -- 12:03 PM PDT     0.69 feet Low Tide
Fri -- 05:43 PM PDT     7.88 feet High Tide
Fri -- 08:19 PM PDT     Sunset
Fri -- 11:50 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.92.645.87.17.56.95.84.53.22.11.10.71.12.54.56.47.67.97.36.45.34.13

Tide / Current Tables for Dumbarton Point 2.3 mi NE, South San Francisco Bay, California Current
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Dumbarton Point 2.3 mi NE
Click for Map
Fri -- 02:13 AM PDT     1.06 knots Max Flood
Fri -- 05:12 AM PDT     -0.00 knots Slack
Fri -- 06:09 AM PDT     Sunrise
Fri -- 09:30 AM PDT     -1.09 knots Max Ebb
Fri -- 11:48 AM PDT     Moonrise
Fri -- 12:04 PM PDT     0.01 knots Slack
Fri -- 02:46 PM PDT     1.27 knots Max Flood
Fri -- 06:02 PM PDT     -0.00 knots Slack
Fri -- 08:19 PM PDT     Sunset
Fri -- 10:07 PM PDT     -0.94 knots Max Ebb
Fri -- 11:50 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.10.71.110.70.1-0.3-0.6-0.9-1.1-1-0.6-00.71.21.31.10.70-0.3-0.7-0.9-0.9-0.8

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 (13,3,4,5)
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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.