Friday, August18, 2017 L-36.com


Marine Weather and Tides
San Mateo, 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 7:58PM Friday August 18, 2017 3:09 PM PDT (22:09 UTC) Moonrise 2:05AMMoonset 4:43PM Illumination 12% 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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PZZ531 San Francisco Bay South Of The Bay Bridge- 249 Pm Pdt Fri Aug 18 2017
.small craft advisory in effect from Saturday afternoon through Saturday evening...
Tonight..NW winds 10 to 20 kt...decreasing to 10 kt after midnight.
Sat..NW winds 10 kt...increasing to 15 to 25 kt in the afternoon.
Sat night..NW winds 15 to 25 kt...decreasing to 10 kt after midnight. Patchy fog after midnight.
Sun..NW winds 10 to 20 kt. Patchy fog in the morning.
Sun night..NW winds 10 to 20 kt. Patchy fog after midnight.
Mon..W winds 5 to 15 kt. Patchy fog.
Tue..SW winds 10 kt.
Wed..SW winds 10 kt.
PZZ500 249 Pm 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... Increasing northwesterly winds will continue through the weekend, particularly for the northern outer waters, as high pressure builds over the eastern pacific. Locally steep wind waves will also accompany increasing winds.

7 Day Forecast for Marine Location Near San Mateo, CA
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location: 37.59, -122.31     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 182047
afdmtr
area forecast discussion
national weather service san francisco bay area
147 pm pdt Fri aug 18 2017

Synopsis Look for one more day of minor warming this afternoon
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 1:47 pm pdt Friday... This morning's low
clouds were quick to clear for most locations as we transition to
a mostly clear afternoon. A few areas along the monterey bay
shoreline and coastal areas from san francisco northward still
have some lingering clouds. Synoptically-speaking, there is an
upper level ridge centered near 38n 135w that has gradually
strengthened over the past 24 hours. This strengthening is
expected to correspond with several degrees of warming at the
surface for inland areas. When all is set and done this Friday
afternoon, expect highs to reach the 60s and 70s along the coast
and 80s and 90s for the interior. This equates to temperatures
near middle august climatological normals along the coast, and
about 2 to 7 degrees above normal for the interior. Can't rule out
the chance that a few areas near pinnacles national park surpass
the century mark.

Over the weekend an upper level low will develop just off the
coast of point conception. This will allow for heights and
thickness values over central and northern california to
decrease. We'll see afternoon temperatures across the interior
trend downward several degrees per day through the weekend.

The main thought on many minds as we head into next week is the
cloud cover for Monday morning's solar eclipse. If conditions
permit, the partial solar eclipse can be viewed throughout
california. Right now, models are all in good agreement that the
upper level low will remain parked near point conception in
southern california. For us along the central coast and north to
the san francisco bay area, this yields a few outcomes. For one,
the low can help mix out the marine layer, resulting in mostly
clear conditions. On the other hand, the upper low could help to
enhance the marine layer depth. We'll know a little bit more over
the weekend and will continue to monitor the marine layer's
response to the trough. Climatologically, the best locations in
the bay area for clear skies on a mid late august morning would be
interior areas of the east bay away from the coast, as well as the
higher elevations in the santa cruz mountains, north bay
mountains, and diablo range. The eclipse of the Sun will begin
shortly after 9:00 am pdt for the bay area with peak obscuration
happening around 10:15 am pdt. Peak obscuration of the Sun will
range from 71 percent in monterey and up to 78 percent in santa
rosa.

Aviation As of 10:30 am pdt Friday... For 18z tafs. Stratus has
begun to burn off retreat back to the coast across most TAF sites.

ExpectingVFR conditions through the afternoon before the return
of low CIGS late tonight early tomorrow morning. Some uncertainty
in the extend of stratus coverage for tomorrow morning.

Vicinity of ksfo...VFR currently with westerly winds increasing
this afternoon to around 15 kt. Expecting stratus to return late
tonight with slightly lower CIGS than what we saw today.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... CIGS have retreated for ksns bringingVFR
conditions. Expecting return of low CIGS this evening. Stratus
still hovering around the edge of kmry. Possible the stratus will
clear out this afternoon although confidence is low, may bounce
betweenVFR and MVFR before the deck returns tonight.

Marine As of 01:30 pm pdt Friday... 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.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pigeon pt 10-60 nm from 6 pm
public forecast: rowe
aviation: as
marine: as
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 8 mi51 min N 12 G 16 67°F 73°F1014.3 hPa
AAMC1 - 9414750 - Alameda, CA 13 mi51 min W 6 G 9.9 67°F 68°F1015.7 hPa
LNDC1 14 mi51 min W 6 G 9.9 66°F 1015.2 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 15 mi51 min W 9.9 G 12 64°F 1015.3 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi57 min W 12 G 20 64°F 1014.2 hPa
OBXC1 15 mi51 min 64°F 59°F
PXSC1 15 mi51 min 65°F 58°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 15 mi51 min W 7 G 9.9
FTPC1 - 9414290 - San Francisco, CA 17 mi57 min WSW 8 G 14 62°F 61°F1015.7 hPa
46237 - San Francisco Bar, CA (142) 22 mi69 min 60°F4 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 22 mi62 min SW 8 66°F 1015 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 22 mi51 min S 12 G 16 64°F 1015.3 hPa
RCMC1 - 9414863 - Richmond, CA 24 mi57 min S 6 G 8.9 66°F 64°F1014.8 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 30 mi79 min SW 3.9 G 5.8 59°F 59°F4 ft1016.3 hPa (-0.6)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 32 mi51 min WSW 11 G 15 69°F 1014 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 32 mi51 min WNW 19 G 21 73°F 69°F1013.7 hPa60°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 34 mi79 min SW 5.8 G 5.8 60°F 62°F6 ft1015.8 hPa (-0.5)
PCOC1 - 9415144 - Port Chicago, CA 35 mi51 min W 15 G 18 73°F 70°F1013.3 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 38 mi51 min NW 15 G 18 75°F 1012.7 hPa
PRYC1 - 9415020 - Point Reyes, CA 45 mi51 min SSE 2.9 G 5.1 64°F 61°F1015.6 hPa
SFXC1 - San Francisco Bay Reserve, CA 45 mi144 min WNW 8 76°F 1014 hPa62°F

Wind History for Redwood City, CA
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W17
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA3 mi73 minWNW 1610.00 miA Few Clouds71°F55°F59%1014.6 hPa
San Carlos Airport, CA5 mi82 minN 107.00 miClear with Haze72°F59°F65%1015.2 hPa
Oakland, Metro Oakland International Airport, CA9 mi76 minWNW 1510.00 miFair70°F59°F68%1015.1 hPa
Hayward, Hayward Air Terminal, CA11 mi75 minWNW 158.00 miFair73°F55°F55%1015.7 hPa
Half Moon Bay Airport, CA11 mi74 minWSW 69.00 miMostly Cloudy64°F57°F78%1015.6 hPa
Palo Alto Airport, CA13 mi82 minN 1010.00 miClear73°F62°F69%1014.9 hPa
Mountain View, Moffett Field, CA18 mi73 minNW 810.00 miFair75°F60°F60%1015.1 hPa

Wind History from SFO (wind in knots)
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Last 24hrNW18W20W18W14NW14NW14W12W15W13W11W10W10W9W9W7W6W6W6NE4NE5NW12NW17NW16W16
1 day agoW13NW14NW13NW14NW10W9NW7NW5NW6NW4W4W5S3W4CalmCalmNW4NW4NW6N5N8NW14NW15NW16
2 days agoSW15
G22
W17W17
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W15W13W11SW6SW11W11SW66S4S4CalmCalmSE3SE3CalmSE7N6N8N86NW13
G19

Tide / Current Tables for Coyote Point Marina, San Francisco Bay, California
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Coyote Point Marina
Click for Map
Fri -- 03:05 AM PDT     Moonrise
Fri -- 04:30 AM PDT     -0.37 feet Low Tide
Fri -- 06:27 AM PDT     Sunrise
Fri -- 11:04 AM PDT     6.26 feet High Tide
Fri -- 04:13 PM PDT     2.55 feet Low Tide
Fri -- 05:42 PM PDT     Moonset
Fri -- 07:57 PM PDT     Sunset
Fri -- 10:11 PM PDT     8.15 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.23.51.80.5-0.3-0.30.41.73.24.75.86.365.143.12.62.83.75.16.57.68.17.9

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
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San Mateo Bridge
Click for Map
Fri -- 01:56 AM PDT     -1.86 knots Max Ebb
Fri -- 03:04 AM PDT     Moonrise
Fri -- 05:33 AM PDT     0.00 knots Slack
Fri -- 06:27 AM PDT     Sunrise
Fri -- 08:32 AM PDT     1.82 knots Max Flood
Fri -- 12:01 PM PDT     -0.00 knots Slack
Fri -- 02:39 PM PDT     -0.91 knots Max Ebb
Fri -- 05:27 PM PDT     0.01 knots Slack
Fri -- 05:42 PM PDT     Moonset
Fri -- 07:57 PM PDT     Sunset
Fri -- 08:10 PM PDT     1.45 knots Max Flood
Fri -- 11:19 PM PDT     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.2-1.7-1.9-1.7-1.2-0.50.51.31.81.81.50.90-0.6-0.9-0.9-0.7-0.30.41.11.41.310.3

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 (18,4,5,8)
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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.