Thursday, February22, 2018 L-36.com


Marine Weather and Tides
Los Altos Hills, 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 6:46AMSunset 5:57PM Thursday February 22, 2018 2:56 PM PST (22:56 UTC) Moonrise 10:57AMMoonset 12:00AM Illumination 52% Phase: First Quarter Moon; Moon at 8 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
    EDIT      (on/off)   Help
PZZ560 Pigeon Point To Point Pinos To 10 Nm- 225 Pm Pst Thu Feb 22 2018
.small craft advisory in effect through Friday evening...
Tonight..NW winds 20 to 30 kt. Wind waves 8 to 10 ft... Decreasing to 5 to 7 ft after midnight. W swell 4 to 5 ft at 18 seconds. Chance of showers and slight chance of Thunderstorms in the evening.
Fri..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 3 to 4 ft at 17 seconds.
Fri night..NW winds 15 to 25 kt...becoming north 5 to 15 kt after midnight. Wind waves 3 to 5 ft. W swell 3 to 5 ft at 16 seconds.
Sat..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 3 to 5 ft at 15 seconds.
Sat night..NW winds 15 to 25 kt. Wind waves 4 to 6 ft. W swell 3 to 5 ft at 15 seconds.
Sun..NW winds 15 to 25 kt. Wind waves 4 to 6 ft. NW swell 3 to 5 ft.
Mon..NW winds 15 to 25 kt. Wind waves 4 to 6 ft. NW swell 3 to 5 ft...increasing to 5 to 7 ft. Chance of showers, then slight chance of showers.
Tue..N winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 5 to 7 ft. Slight chance of showers.
PZZ500 225 Pm Pst Thu Feb 22 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Blustery northerly winds across the coastal waters this afternoon and tonight with gale force gusts possible over the outer waters. Strong winds will generate steep wind waves creating hazardous seas. Winds will begin to decrease tomorrow, but remain high enough for small craft advisories. Scattered showers will continue to stream over the waters this afternoon. Another upper-level disturbance will move then into the region early next week.

7 Day Forecast for Marine Location Near Los Altos Hills, CA
   Hourly   EDIT   Help
location: 37.35, -122.18     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kmtr 222145
afdmtr
area forecast discussion
national weather service san francisco bay area
145 pm pst Thu feb 22 2018

Synopsis A weak weather system will impact the area today
bringing widely scattered showers, a slight chance of
thunderstorms in the afternoon, and lowering snow levels. This
system will also bring gusty winds and colder temperatures by
Friday morning. Dry weather and slightly warmer temperatures are
expected for the weekend. Cooler, unsettled weather to return
early next week.

Discussion As of 02:00 pm pst Thursday... Unsettled weather
continues today as a 535dm 500mb upper low centered over
northeastern oregon continues to slide southward toward california
early this afternoon. Northwest winds increased as the base of the
trough approaching the area, tightening the onshore gradient.

Sustained winds of 20 to 30 mph with gusts generally 35 to around 45
mph have been reported so far across many areas, but particularly
along the coast and over the higher terrain. The strongest wind
speed thus so far was 43 mph, which was reported at several
locations: whale point, mt diablo, altamont pass, point reyes,
and point arena. The colder air in the base of this trough has now
entered into proximity of the san francisco bay and monterey bay
areas, and as a result, scattered to numerous convective showers
are being detected by kmux kgo and kpix radars. Most of these
showers have been light so far, with only very minors
accumulations of a few to several hundredths of an inch reported.

As even colder air advects into our region, look for snow levels
to gradually drop from 3000 feet down to 2000 feet, with light
dustings of snow down to these elevations. Additionally, look for
these rain and snow showers to strengthen and become more
widespread through the remainder afternoon and into the early
evening. Small hail and a few isolated thunderstorms are even
possible as these storm cells continue to strengthen through the
remainder of the day. Overall, the forecast is panning out about
as expected as our forecast area remains on the drier windier
backside of this storm system.

By tonight, much colder air will advect in with the core of the
upper low, resulting in another round of near to subfreezing
temperatures for the area tonight tomorrow morning. These
temperatures will not be quite as cold as Monday night Tuesday
morning, but widespread upper 20s to upper 30s are forecast. As a
result, take any necessary precautions to protect any vulnerable
plants, pets, and populations ahead of these cold overnight
temperatures.

Looking ahead, temperatures rebound slightly over the coming days
as a weak shortwave ridge develops over the area late tomorrow
through the upcoming weekend. Forecast models show a pair of more
organized but still relatively dry storm systems moving through
the forecast area through the duration of next week. This means
that this cool, unsettled weather is not going anywhere anytime
soon. Precipitation amounts with the storm systems next week are
likely to exceed those of this week (which won't be difficult
given locations such as downtown san francisco are at 0.00" for
the month), however, these storms presently do not appear to be
fueled by extremely wet subtropical moisture plumes that we
usually associated with our wetter storm systems (generally

50- 66" of tpw -- we usually want to see >1.0" for wetter
events). Stay tuned as we track these upcoming storms.

Aviation As of 9:56 am pst Thursday for 18z tafs...VFR
conditions to prevail with occasional MVFR CIGS possible. Strong
west to northwest winds will continue to increase into the
afternoon with sustained winds of 15 to 25 kt and gusts over 30
kt. Sfo may reach gusts up to 40 kt this afternoon and this
evening. Scattered showers expected this afternoon and into the
early evening. Isolated thunderstorms are possible, but will
mainly be confined to the east.

Vicinity of ksfo...VFR conditions to prevail with occasional sct
cigs at around 3000 to 4000 ft. West to northwest winds have
already occasionally gusted to 34 kt. Winds will increase this
afternoon with more frequent higher gusts. Sustained winds are
expected around 25 kt this afternoon with gusts of 35 to 40 kt
possible. An airport weather warning has already been issued from
12 pm (20z) to 7 pm (03z) this evening. Winds will remain gusty
tonight and into early tomorrow morning. Updates will be made as
necessary. Scattered showers in the vicinity possible starting
this afternoon.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR. Scattered clouds throughout the day
with strong onshore winds this afternoon. Sustained winds around
20 kt at kmry and nearly 25 kt at ksns with gusts approaching 30
kt. Winds will start to decrease late tonight into tomorrow
morning.

Marine As of 08:32 am pst Thursday... Expect increasing
northerly winds across the coastal waters today as an upper-level
disturbance moves through the region. This system will produce
gale-force winds over the outer waters. Strong winds will result
in steep wind waves and hazardous seas.

Mtr watches warnings advisories
Tngt Sca... Pigeon pt to pt pinos 0-10 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
glw... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm until 5 pm
glw... Pigeon pt to pt piedras blancas 10-60 nm from 5 pm
sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm
sca... Mry bay until 3 am
sca... Sf bay until 10 pm
public forecast: drp
aviation: as
marine: as
visit us at

Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 11 mi39 min W 19 G 23 50°F 53°F1023.6 hPa
AAMC1 - 9414750 - Alameda, CA 30 mi39 min W 16 G 20 51°F 53°F1022.4 hPa
LNDC1 31 mi39 min WNW 13 G 18 52°F 1022.2 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 32 mi39 min W 22 G 28
PXOC1 - 9414311 - San Francisco (Pier 1), CA 33 mi39 min W 17 G 28 51°F 1021.4 hPa
PXSC1 33 mi39 min 51°F 38°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 33 mi39 min W 20 G 25 50°F 1022.1 hPa
OBXC1 33 mi39 min 51°F 40°F
FTPC1 - 9414290 - San Francisco, CA 35 mi39 min WNW 15 G 29 48°F 54°F1023.2 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 37 mi67 min NW 18 G 21 50°F 53°F7 ft1023.8 hPa (-1.6)
46237 - San Francisco Bar, CA (142) 39 mi57 min 52°F5 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 40 mi43 min NW 9.9 50°F 1022 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 40 mi39 min WNW 18 G 25 53°F 1021.8 hPa
RCMC1 - 9414863 - Richmond, CA 41 mi39 min WNW 17 G 22 51°F 53°F1021.9 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA 41 mi67 min WNW 16 G 19 50°F 54°F8 ft1024.4 hPa (-1.2)
46092 - MBM1 42 mi52 min NW 14 50°F 53°F1024.4 hPa (-0.7)
46114 - West Monterey Bay, CA 44 mi57 min 54°F9 ft
ELXC1 - Elkhorn Slough Reserve, CA 44 mi72 min NW 18 53°F 1023 hPa41°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 45 mi67 min NW 21 G 29 49°F 51°F6 ft1023.3 hPa (-1.9)
MZXC1 - 9415102 - Martinez-Amorco CA 47 mi39 min WNW 12 G 17 50°F 53°F1021.5 hPa39°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 49 mi39 min NW 16 G 20 52°F 1021.4 hPa
PCOC1 - 9415144 - Port Chicago, CA 49 mi39 min W 16 G 19 50°F 52°F1021.1 hPa

Wind History for Redwood City, CA
(wind in knots)    EDIT      (on/off)   Help
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
Last
24hr
NW8
G11
NW6
G9
NW8
G11
W7
G10
W11
W6
W5
SW3
SW4
SW3
S4
S2
W4
W8
W11
G14
W11
G15
W11
W18
G22
W17
G21
NW10
G18
NW16
W15
G22
W17
G22
W17
G25
1 day
ago
W12
G15
W11
W12
W10
G14
W10
W7
SW4
S2
SE3
SW3
S2
SE3
SE4
E3
SE3
E2
E4
E4
E3
N3
NW1
N4
N5
N5
G8
2 days
ago
NW12
G15
W16
W19
G23
W14
G17
W14
G18
W10
G13
W9
W5
W3
NW7
W1
G4
SW2
SW3
S2
--
SE2
SE3
S2
E3
E3
E4
G7
E3
E3
N9
G14

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mountain View, Moffett Field, CA9 mi61 minWNW 14 G 2110.00 miMostly Cloudy54°F35°F49%1023.7 hPa
Palo Alto Airport, CA10 mi70 minWNW 15 G 2410.00 miMostly Cloudy52°F35°F54%1023.7 hPa
San Carlos Airport, CA13 mi70 minWNW 17 G 2510.00 miMostly Cloudy54°F35°F51%1023.4 hPa
San Jose, San Jose International Airport, CA13 mi64 minW 11 G 2010.00 miMostly Cloudy54°F35°F49%1023.2 hPa
San Jose / Reid / Hillv, CA19 mi70 minNW 1310.00 miPartly Cloudy52°F37°F58%1023 hPa
Half Moon Bay Airport, CA20 mi62 minNW 15 G 218.00 miMostly Cloudy52°F41°F67%1023 hPa
San Francisco, San Francisco International Airport, CA21 mi61 minW 21 G 3110.00 miMostly Cloudy and Breezy55°F37°F51%1023.1 hPa
Hayward, Hayward Air Terminal, CA22 mi63 minW 18 G 2310.00 miPartly Cloudy and Breezy55°F36°F49%1023.7 hPa
Oakland, Metro Oakland International Airport, CA24 mi64 minW 2210.00 miPartly Cloudy and Breezy54°F37°F55%1022.6 hPa

Wind History from NUQ (wind in knots)
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
Last 24hrN11N9N9NW6NW6NW3N43W5CalmS4CalmCalmS3SW3W4--W6NW6
G14
NW10
G19
N11NW12
G25
NW10
G19
NW14
G21
1 day agoN145
G24
NW7NW6W5W4CalmCalmSW3E5SE3SE4SE5SE5SE5SE3SE5E4SE3N3N4N7N7N6
2 days agoNW9
G18
NW11
G17
W7W11
G16
W9W5W4W5CalmW3CalmW5W4CalmCalmE3CalmCalmSE3CalmN5N4N5N8

Tide / Current Tables for Palo Alto Yacht Harbor, California
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Palo Alto Yacht Harbor
Click for Map
Thu -- 12:02 AM PST     2.43 feet Low Tide
Thu -- 05:32 AM PST     8.28 feet High Tide
Thu -- 06:48 AM PST     Sunrise
Thu -- 10:56 AM PST     Moonrise
Thu -- 12:56 PM PST     1.14 feet Low Tide
Thu -- 05:55 PM PST     Sunset
Thu -- 06:14 PM PST     6.48 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.42.73.75.378.18.27.25.84.43.22.21.41.11.62.84.45.86.56.35.54.74.13.5

Tide / Current Tables for Dumbarton Point 2.3 mi NE, South San Francisco Bay, California Current
   EDIT      (on/off)   Help   One Week of Data
Dumbarton Point 2.3 mi NE
Click for Map
Thu -- 02:20 AM PST     0.97 knots Max Flood
Thu -- 05:21 AM PST     -0.00 knots Slack
Thu -- 06:48 AM PST     Sunrise
Thu -- 10:02 AM PST     -1.11 knots Max Ebb
Thu -- 10:56 AM PST     Moonrise
Thu -- 12:46 PM PST     0.01 knots Slack
Thu -- 03:20 PM PST     0.98 knots Max Flood
Thu -- 05:55 PM PST     Sunset
Thu -- 06:43 PM PST     -0.00 knots Slack
Thu -- 10:31 PM PST     -0.65 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.20.70.90.90.60.2-0.2-0.5-0.8-1-1.1-0.9-0.40.10.710.90.70.4-0.1-0.3-0.5-0.6-0.6

Weather Map and Satellite Images
       (on/off)   Help
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 (17,4,5,8)
      (on/off)   Help

Ground Weather Radar Station San Francisco Bay Area, CA
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.