Tuesday, February20, 2018 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 6:49AMSunset 5:56PM Tuesday February 20, 2018 7:39 AM PST (15:39 UTC) Moonrise 9:43AMMoonset 10:55PM Illumination 28% 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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PZZ530 San Pablo Bay Suisun Bay The West Delta And San Francisco Bay North Of The Bay Bridge- 224 Am Pst Tue Feb 20 2018
.small craft advisory in effect until 3 am pst early this morning...
Today..N winds 10 kt...becoming S in the afternoon.
Tonight..W winds 5 to 15 kt. Slight chance of showers after midnight.
Wed..NE winds 5 to 15 kt. Chance of showers in the morning.
Wed night..W winds 5 to 15 kt.
Thu..NW winds 15 to 25 kt.
Fri..NW winds 5 to 15 kt.
Sat..SE winds 10 kt...becoming w.
PZZ500 224 Am Pst Tue Feb 20 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Winds will decrease by this afternoon as low pressure moves eastward. Another system will move across the waters on Thursday with northwesterly winds expected to increase once again starting Wednesday night.

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 201129
afdmtr
area forecast discussion
national weather service san francisco bay area
329 am pst Tue feb 20 2018

Synopsis A cold air mass over the region this morning will
result in freezing temperatures for most inland areas with frost
potentially impacting many coastal locations. A series of weak
weather systems will then impact the region through late week and
potentially into early next week bringing cool, unsettled weather
conditions.

Discussion As of 03:00 am pst Tuesday... Chilly conditions
being observed over the region this morning with most locations in
the 30s to upper 20s. Meanwhile, lower 40s are being reported in
san francisco and around the bay. While widespread freezing
temperatures are still likely across inland areas through the
remainder of the morning, temperatures may not be as cold as
previously forecast for portions of the region as winds have been
a bit slower to subside. With all this said, widespread frost is
likely inland with areas of frost potentially impacting some
coastal areas. A freeze warning remains in effect for inland areas
with a frost advisory in effect for coastal areas (except for the
city of san francisco) through 9 am pst.

Mostly sunny conditions are expected over the region today with
daytime temperatures warming into the 50s in most urban areas. These
conditions should feel a bit more comfortable than those on Monday
given weaker winds. Another mid upper level system is then forecast
to approach the region from the north late tonight into Wednesday
morning. Look for an increase in cloud cover and potential for
showers out over the coast initially. The latest forecast models are
not trending further inland with the potential for light
precipitation, especially along the coast and in the
hills mountains. This system will to be a cold one with lowering
snow levels once again during the next 24-36 hours. However,
widespread precipitation is not likely with most locations remaining
dry as this system quickly passes across the region.

Additional weak systems are forecast to drop southward along the
back side of the broad mid upper level trough positioned over the
western portion of the country through late week. This will maintain
chances for isolated to at times scattered showers Thursday into
Friday morning. In addition, snow showers cannot be ruled out in the
highest elevations over the region through late week as well.

Despite this unsettled pattern, widespread measurable rainfall is
not expected across the region at this time. This pattern will also
support reinforcing shots of colder air masses which will keep
temperatures below seasonal averages and potential for freezing
conditions for inland areas on nights when sky conditions clear out
and winds subside.

Conditions are then forecast to warm slightly for at least the start
of the upcoming weekend in response to a weak short-wave ridge that
develops over the region. This pattern will likely be short lived as
the models generally point towards additional systems dropping
southward down the west coast early next week. The models do differ
on timing, strength and available moisture which each system late in
the period. Thus, confidence in the details remains low at this
time. Overall, look for cool and unsettled conditions heading into
the end of the month.

Aviation As of 3:30 am pst Tuesday... Winds will continue to
decrease into the morning.VFR conditions through the period with
cigs beginning to move in tonight.

Vicinity of ksfo...VFR.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR.

Climate
Here are record low temperatures and the years they occurred for
Tuesday and Wednesday.

Location Tuesday Wednesday
sf bay area
healdsburg 22 in 1922 28 in 1929
santa rosa 26 in 1913 26 in 1913
calistoga 25 in 2006 25 in 2006
kentfield 27 in 1913 29 in 1953
san rafael 32 in 2006 33 in 1955
napa 28 in 1920 29 in 1955
san francisco 38 in 1897 36 in 1890
sfo airport 37 in 2011 34 in 1955
half moon bay 32 in 2013 31 in 2006
oakland airport 34 in 2006 33 in 1955
richmond 35 in 1990 35 in 1981
livermore 28 in 1942 27 in 1955
moffett field 34 in 2006 32 in 1955
san jose 30 in 1897 25 in 1897
gilroy 30 in 1990 31 in 1976
monterey bay area
santa cruz 29 in 1913 30 in 1955
salinas 31 in 2006 31 in 1970
salinas airport 28 in 1953 30 in 1953
monterey 35 in 2006 36 in 1952
king city 22 in 1953 23 in 1953

Marine As of 02:24 am pst Tuesday... Winds will decrease by
this afternoon as low pressure moves eastward. Another system will
move across the waters on Thursday with northwesterly winds
expected to increase once again starting Wednesday night.

Mtr watches warnings advisories
Tday Frost advisory... Caz505-508-509-529-530
freeze warning... Caz506-507-510>513-516>518-528
sca... Pigeon pt to pt pinos 0-10 nm until 6 am
sca... Pt pinos to pt piedras blancas 0-10 nm until 6 am
sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm until 3 pm
public forecast: rgass
aviation: as
marine: as
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 8 mi52 min SSE 2.9 G 2.9 37°F 54°F1024 hPa
AAMC1 - 9414750 - Alameda, CA 13 mi58 min NNE 1.9 G 5.1 40°F 54°F1023.5 hPa
LNDC1 14 mi52 min NNE 5.1 G 6 40°F 1023.5 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 15 mi52 min NNE 8 G 11
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi52 min N 7 G 8.9 42°F 1022.5 hPa
OBXC1 15 mi52 min 41°F 31°F
PXSC1 15 mi52 min 43°F 32°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 15 mi52 min NNE 9.9 G 11 41°F 1023.6 hPa
FTPC1 - 9414290 - San Francisco, CA 17 mi58 min SE 5.1 G 7 42°F 52°F1023.7 hPa
46237 - San Francisco Bar, CA (142) 22 mi70 min 50°F5 ft
PPXC1 - 9414847 - Richmond (Point Potrero), CA 22 mi52 min NNE 8.9 G 9.9 40°F 1023.7 hPa
RCMC1 - 9414863 - Richmond, CA 24 mi58 min N 7 G 8.9 41°F 53°F1023.2 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 30 mi50 min NNW 14 G 16 44°F 50°F7 ft1023.4 hPa (+1.2)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 32 mi52 min SW 4.1 G 5.1 38°F 1023.5 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 32 mi52 min SE 4.1 G 4.1 37°F 53°F1023.7 hPa36°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 34 mi50 min NNW 19 G 21 47°F 53°F10 ft1023 hPa (+1.3)
PCOC1 - 9415144 - Port Chicago, CA 35 mi52 min S 7 G 8.9 34°F 52°F1023.5 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 38 mi52 min W 1.9 G 5.1 39°F 1023.4 hPa
SFXC1 - San Francisco Bay Reserve, CA 45 mi115 min S 1.9 29°F 1023 hPa24°F
PRYC1 - 9415020 - Point Reyes, CA 45 mi52 min WNW 9.9 G 13 48°F1023.1 hPa

Wind History for Redwood City, CA
(wind in knots)    EDIT      (on/off)   Help
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W11
G15
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G23
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G13
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G16
NW12
G15
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G23
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W8
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W15
G22
W13
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G17
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W2
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G17
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G12

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA3 mi44 minWSW 310.00 miFair39°F28°F65%1023.5 hPa
San Carlos Airport, CA5 mi45 minN 010.00 miFair36°F28°F75%1023.7 hPa
Oakland, Metro Oakland International Airport, CA9 mi47 minNE 410.00 miA Few Clouds32°F28°F85%1023.8 hPa
Hayward, Hayward Air Terminal, CA11 mi46 minENE 510.00 miFair35°F23°F61%1024.8 hPa
Half Moon Bay Airport, CA11 mi45 minNE 310.00 miFair30°F24°F80%1022.3 hPa
Palo Alto Airport, CA13 mi53 minN 010.00 miClear0°F0°F%1023.7 hPa
Mountain View, Moffett Field, CA18 mi44 minN 010.00 miFair36°F28°F76%1024.3 hPa

Wind History from SFO (wind in knots)
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Last 24hrNW16
G23
NW14N11N11N13N8W16W19W22
G30
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G29
W14NW11W11NW8NW9NW6W5W5CalmCalmW5W4SW3W3
1 day agoW15
G19
W17
G20
W21W20
G29
NW23
G29
W22
G31
W21
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G32
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W12W15
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W14W15W14W15W18NW23
G30
2 days agoCalmN3E4NE3N3NE4CalmW18W15W17W17W19W10W11W11
G19
W19W14
G19
W15
G21
W19W18
G30
W14
G19
W16W16W11

Tide / Current Tables for Coyote Point Marina, San Francisco Bay, California
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Coyote Point Marina
Click for Map
Tue -- 02:53 AM PST     7.03 feet High Tide
Tue -- 06:52 AM PST     Sunrise
Tue -- 09:13 AM PST     1.58 feet Low Tide
Tue -- 09:43 AM PST     Moonrise
Tue -- 03:14 PM PST     6.03 feet High Tide
Tue -- 05:53 PM PST     Sunset
Tue -- 09:13 PM PST     1.32 feet Low Tide
Tue -- 10:54 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.55.96.876.65.64.22.921.61.82.53.64.75.665.95.142.71.81.31.52.4

Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
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San Mateo Bridge
Click for Map
Tue -- 12:51 AM PST     1.47 knots Max Flood
Tue -- 04:17 AM PST     -0.00 knots Slack
Tue -- 06:52 AM PST     Sunrise
Tue -- 07:34 AM PST     -1.38 knots Max Ebb
Tue -- 09:42 AM PST     Moonrise
Tue -- 10:35 AM PST     0.00 knots Slack
Tue -- 01:19 PM PST     1.24 knots Max Flood
Tue -- 04:39 PM PST     -0.00 knots Slack
Tue -- 05:53 PM PST     Sunset
Tue -- 07:53 PM PST     -1.22 knots Max Ebb
Tue -- 10:35 PM PST     0.00 knots Slack
Tue -- 10:54 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.31.51.20.80.2-0.4-0.9-1.3-1.3-0.9-0.30.30.91.21.20.80.4-0.2-0.7-1.1-1.2-0.9-0.30.2

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 (10,2,3,4)
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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.