Sunday, March24, 2019 L-36.com


Marine Weather and Tides
Portola Valley, CA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:04AMSunset 7:24PM Sunday March 24, 2019 1:41 AM PDT (08:41 UTC) Moonrise 10:48PMMoonset 8:41AM Illumination 88% Phase: Waning Gibbous; Moon at 18 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 Coastal Waters From Pigeon Point To Point Pinos California Out To 10 Nm- 905 Pm Pdt Sat Mar 23 2019
.small craft advisory in effect through Sunday morning...
Tonight..NW winds 10 to 20 kt with gusts up to 30 kt...becoming north 5 to 15 kt after midnight. Wind waves 3 to 4 ft this evening...becoming 2 ft or less. W swell 10 to 12 ft at 16 seconds.
Sun..S winds 5 to 15 kt. Wind waves 2 ft or less. W swell 8 to 11 ft at 15 seconds.
Sun night..S winds 15 to 25 kt with gusts up to 35 kt. Wind waves 4 to 6 ft. W swell 7 to 8 ft at 14 seconds. A chance of rain.
Mon..SW winds 20 to 30 kt. Wind waves 4 to 6 ft. W swell 7 to 9 ft at 14 seconds. Rain likely.
Mon night..E winds 5 to 10 kt. Wind waves 2 ft or less. W swell 7 to 8 ft at 13 seconds. A chance of showers.
Tue..S winds 5 to 10 kt. Wind waves 2 ft or less. W swell 7 to 8 ft at 13 seconds. A chance of showers.
Tue night..S winds 10 to 15 kt. Wind waves 3 to 4 ft. W swell 5 to 7 ft at 13 seconds. Rain likely.
Wed..SW winds 5 to 15 kt. Wind waves 3 to 4 ft. W swell 6 to 9 ft. Rain likely.
Thu..NW winds 5 to 10 kt. Wind waves 2 ft or less. W swell 7 to 9 ft. A chance of showers.
PZZ500 905 Pm Pdt Sat Mar 23 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure over the offshore waters will move south and east reaching the central coast on Sunday. Winds will shift to southerly on Sunday and increase ahead of a low pressure trough approaching from the west, light to moderate rain will accompany the trough Sunday evening through Monday evening. Northwest swell subsides on Sunday then increases Sunday night into Monday followed by another lull in swell prior to an increase in northwest to west swell Wednesday next week. Expect wet and chilly weather early to mid next week then drying by late week.


7 Day Forecast for Marine Location Near Portola Valley, CA
   Hourly   EDIT   Help
location: 37.36, -122.23     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kmtr 240534
afdmtr
area forecast discussion
national weather service san francisco bay area
1034 pm pdt Sat mar 23 2019

Synopsis Dry and mild weather will continue through Sunday
evening. Periods of rain are expected from late Sunday night
through at least Thursday of next week as a series of storm
systems impact northern and central california. Dry weather may
return late in the week and into next weekend.

Discussion As of 9:05 pm pdt Saturday... Isolated afternoon
showers ended by sunset and current satellite shows mostly clear
skies across our region. Winds have become light. Clear skies and
light winds overnight will mean chilly temperatures by sunrise
Sunday. Early morning lows on Sunday are forecast to range from
the upper 30s to mid 40s in most areas, with mid 30s likely in the
colder inland valleys.

After a cool start on Sunday, afternoon temperatures are expected
to climb into the 60s, except upper 50s close to the ocean. Skies
will start off mostly sunny tomorrow, but high clouds will likely
increase through the day as the next pacific storm system draws
closer to the west coast. That system can currently be seen on ir
satellite imagery out along 135w. The models have trended slightly
slower with this system and the leading edge of the light warm
advection precipitation is not expected to begin spreading across
the northern portion of our area until about midnight Sunday
night. Rain rates will then likely begin to increase in the north
bay in the pre-dawn hours of Monday as the main frontal boundary
nears the coast. The frontal boundary is then forecast to stall
across the north bay through about midday Monday (or until late
afternoon per the 00z nam) before finally pushing south and east
across most of the remainder of our area from Monday afternoon
through Monday night. The boundary is forecast to weaken
considerably as it pushes south of the golden gate. The weak
boundary will then stall over the far southern portion of our area
late Monday night into Tuesday and the models suggest slight
enhancement on Tuesday south of monterey bay as a weak wave
develops along the front.

Rainfall totals with this first system from late Sunday night
through Tuesday are currently forecast to range from 0.50-1.50"
in the north bay and from 0.25-0.75" for the rest of our area,
except less than a quarter inch for far southern inland areas. The
12z local WRF is somewhat more bullish on precipitation potential
(as usual) and forecasts as much as 2.5 inches of rain in
northwest sonoma county through late Tuesday, with the bulk of
that rain expected to fall late Sunday night and Monday morning.

The 00z nam, which stalls the front longer in the north bay, also
predicts up to 2.5 inches of rain in northwest sonoma county
with this first system. The upshot is that QPF for the north bay
may need to be increased in the late Sunday night Monday time
frame.

The next system is forecast so spread widespread rainfall across
our area on Tuesday night, with numerous showers to follow through
Wednesday and Wednesday evening. Showers are then expected to
gradually taper off late Wednesday night and Thursday as the upper
trough finally moves inland. Precipitation totals with the second
system from Tuesday night through Thursday are expected to be
similar to the first system earlier in the week, except somewhat
more evenly distributed from north to south.

In the longer range, the 12z ECMWF develops a shortwave ridge
along the west coast late in the week and forecasts dry weather
across most of our region from Friday through next weekend. The
deterministic GFS has recently been developing a high amplitude
pattern near the west coast by late next week with cold, but
mostly dry, systems forecast to drop in from the north. It should
be noted that the GFS ensemble mean, and several GFS ensemble
members, are more closely aligned with the ECMWF solution.

Aviation As of 10:34 pm pdt Saturday...VFR except a few patches
of valley fog are possible early Sunday morning. Rain arrives late
Sunday night into Monday.

Vicinity of ksfo...VFR, westerly wind near 10 knots becoming light
ne late tonight and Sunday morning.VFR extends into Sunday evening
with gradually increasing mid and high clouds, rain arrives late
Sunday night into Monday. Onshore wind returns by mid afternoon
Sunday becoming light SE Sunday evening.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR, wind gradually becoming light e-se
except SE up to 10 knots in the salinas valley Sunday morning and
early afternoon. Onshore winds returning in the afternoon Sunday.

Rain last to arrive here Monday extending into Monday evening.

Marine As of 10:27 pm pdt Saturday... High pressure over the
offshore waters will move south and east reaching the central
coast on Sunday. Winds will shift to southerly on Sunday and
increase ahead of a low pressure trough approaching from the west,
light to moderate rain will accompany the trough Sunday evening
through Monday evening. Northwest swell subsides on Sunday then
increases Sunday night into Monday followed by another lull in
swell prior to an increase in northwest to west swell Wednesday
next week. Expect wet and chilly weather early to mid next week
then drying by late week.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm
sca... Pigeon pt to pt pinos 0-10 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Rough bar advisory for sf bar
sca... Mry bay until 3 am
public forecast: dykema
aviation marine: canepa
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 10 mi53 min S 5.1 G 6 48°F 60°F1024.4 hPa
AAMC1 - 9414750 - Alameda, CA 29 mi59 min E 2.9 G 5.1 50°F 59°F1024.1 hPa
LNDC1 30 mi53 min SE 4.1 G 5.1 52°F 1023.6 hPa
OBXC1 31 mi53 min 52°F 45°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 31 mi53 min Calm G 1 52°F 1022.6 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 31 mi59 min E 2.9 G 4.1
OKXC1 - 9414776 - Oakland (Berth 34), CA 32 mi53 min ESE 1.9 G 2.9 51°F 1023.7 hPa
PXSC1 32 mi59 min 54°F 46°F
FTPC1 - 9414290 - San Francisco, CA 33 mi59 min SSW 2.9 G 5.1 48°F 56°F1023.8 hPa
46237 - San Francisco Bar, CA (142) 36 mi71 min 55°F10 ft
PPXC1 - 9414847 - Richmond (Point Potrero), CA 38 mi53 min NNE 1 G 1.9 52°F 1023.8 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 39 mi180 min SW 4.1 49°F 1024 hPa
RCMC1 - 9414863 - Richmond, CA 40 mi53 min 57°F
46042 - MONTEREY - 27NM West of Monterey Bay, CA 41 mi51 min N 12 G 14 54°F 55°F11 ft1022.8 hPa (-0.3)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 42 mi51 min N 5.8 G 12 53°F 56°F10 ft1024 hPa
46092 - MBM1 43 mi87 min NNW 12 54°F 56°F1023.5 hPa (+0.4)
46114 - West Monterey Bay, CA 44 mi71 min 56°F11 ft
MLSC1 - Moss Landing, South Harbor, CA 45 mi49 min ESE 2.9 G 8 48°F 1024.5 hPa (+0.6)44°F
ELXC1 - Elkhorn Slough Reserve, CA 46 mi116 min SE 5.1 49°F 1024 hPa46°F
MZXC1 - 9415102 - Martinez-Amorco CA 47 mi59 min S 4.1 G 5.1 50°F 57°F1023.5 hPa50°F
UPBC1 47 mi53 min SSW 6 G 7
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 48 mi53 min SW 2.9 G 5.1 52°F 1023.3 hPa
PCOC1 - 9415144 - Port Chicago, CA 49 mi53 min S 7 G 8 48°F 57°F1023.5 hPa

Wind History for Redwood City, CA
(wind in knots)    EDIT      (on/off)   Help
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
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
Last
24hr
--
SE3
E2
S3
W3
W6
W7
W6
NW6
NW11
G14
NW10
G13
NW9
G13
W13
G16
NW14
G17
NW14
G17
W13
G16
NW11
G14
NW8
W8
W4
W2
S3
SE4
S5
1 day
ago
S4
S4
E1
SE3
G6
SE4
SE4
G7
E3
SE4
E5
E8
G12
SE4
G10
E5
G8
SE5
G9
S8
S6
SE6
E4
E7
G10
SE4
G7
SE4
G8
SE4
G7
S3
SE3
SE2
2 days
ago
--
SW2
SW2
SE1
SE2
E1
NE3
N5
N7
N7
N11
G14
W13
SW17
W12
W8
G11
W9
W5
SW3
--
S3
S2

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Palo Alto Airport, CA10 mi4.9 hrsW 610.00 miClear52°F44°F77%1024 hPa
Mountain View, Moffett Field, CA11 mi1.8 hrsN 010.00 miFair50°F42°F74%1024.8 hPa
San Carlos Airport, CA12 mi46 minSSW 410.00 miFair46°F44°F93%1024 hPa
San Jose, San Jose International Airport, CA16 mi48 minSSE 310.00 miFair47°F32°F56%1023.9 hPa
Half Moon Bay Airport, CA18 mi46 minNE 39.00 miFair45°F41°F87%1024 hPa
San Francisco, San Francisco International Airport, CA19 mi1.8 hrsWNW 37.00 miA Few Clouds52°F45°F77%1023.7 hPa
Hayward, Hayward Air Terminal, CA22 mi47 minENE 310.00 miFair62°F42°F48%1024.5 hPa
San Jose / Reid / Hillv, CA22 mi3.9 hrsN 510.00 miPartly Cloudy52°F44°F77%1023.4 hPa
Oakland, Metro Oakland International Airport, CA23 mi48 minESE 410.00 miFair49°F46°F93%1023.9 hPa

Wind History from PAO (wind in knots)
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
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
Last 24hr------------------W5W5W4NW8NW8NW9NW11N13NW14W13W14----W10W6
1 day ago------------------SE5SE5S4--SE10SE11--E10SE9SE9SE7SE10SE9SE9SE10
2 days ago------------------CalmCalm4CalmE5NE4N6N9N9--NW11NW14----W4

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
Sun -- 03:51 AM PDT     8.36 feet High Tide
Sun -- 07:06 AM PDT     Sunrise
Sun -- 09:40 AM PDT     Moonset
Sun -- 10:55 AM PDT     0.03 feet Low Tide
Sun -- 04:31 PM PDT     7.06 feet High Tide
Sun -- 07:23 PM PDT     Sunset
Sun -- 11:12 PM PDT     1.85 feet Low Tide
Sun -- 11:47 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
2.54.46.57.98.37.76.34.631.50.400.62.14.15.96.976.35.34.23.22.31.9

Tide / Current Tables for Dumbarton Hwy Bridge, South San Francisco Bay, California Current
   EDIT      (on/off)   Help   One Week of Data
Dumbarton Hwy Bridge
Click for Map
Sun -- 01:14 AM PDT     1.63 knots Max Flood
Sun -- 04:04 AM PDT     -0.00 knots Slack
Sun -- 07:06 AM PDT     Sunrise
Sun -- 07:33 AM PDT     -1.35 knots Max Ebb
Sun -- 09:40 AM PDT     Moonset
Sun -- 10:53 AM PDT     0.01 knots Slack
Sun -- 02:00 PM PDT     1.76 knots Max Flood
Sun -- 05:10 PM PDT     -0.00 knots Slack
Sun -- 07:23 PM PDT     Sunset
Sun -- 08:02 PM PDT     -0.86 knots Max Ebb
Sun -- 11:01 PM PDT     0.01 knots Slack
Sun -- 11:47 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
1.31.61.50.90.1-0.5-1-1.3-1.3-1-0.50.10.91.61.81.610.2-0.4-0.7-0.9-0.7-0.4-0

Weather Map and Satellite Images
       (on/off)   HelpWeather Map
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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (4,6,7,8)
      (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.