Sunday, January21, 2018 L-36.com


Marine Weather and Tides
Redwood City, 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 7:17AMSunset 5:23PM Sunday January 21, 2018 4:54 AM PST (12:54 UTC) Moonrise 10:04AMMoonset 9:56PM Illumination 23% 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
    EDIT      (on/off)   Help
PZZ530 San Pablo Bay Suisun Bay The West Delta And San Francisco Bay North Of The Bay Bridge- 212 Am Pst Sun Jan 21 2018
.small craft advisory in effect from this afternoon through Monday morning...
Today..SW winds 5 to 15 kt...becoming 15 to 25 kt late this afternoon. Chance of rain in the afternoon.
Tonight..S winds 15 to 25 kt. Chance of rain in the evening, then rain likely after midnight.
Mon..SE winds 15 to 25 kt...decreasing to 5 to 15 kt by noon. Slight chance of rain in the morning.
Mon night..NE winds 5 to 15 kt.
Tue..NE winds 10 kt.
Wed..SE winds 10 to 20 kt...becoming W 5 to 15 kt. Rain likely.
Thu..W winds 5 to 15 kt. Chance of showers.
PZZ500 212 Am Pst Sun Jan 21 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Winds will increase and become southwesterly later this morning, especially for the northern coastal waters, ahead of an arriving weak cold front. The cold front is forecast to pass through Monday morning and will switch winds out of the north again. Small craft advisories are in place for most coastal water zones mainly due to squared and hazardous seas over the next couple of days. A new northwest swell train arrives by this evening.

7 Day Forecast for Marine Location Near Redwood City, CA
   Hourly   EDIT   Help
location: 37.52, -122.2     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kmtr 211202
afdmtr
area forecast discussion
national weather service san francisco bay area
402 am pst Sun jan 21 2018

Synopsis Dry and cool weather is forecast to continue across
our entire area through at least midday Sunday. The next system
is expected to spread rain across primarily the northern portion
of the forecast area late Sunday and Sunday night. The weather
pattern will remain active into next week, with more rain likely
by midweek.

Discussion As of 8:55 pm pst Saturday... After a cool start
this morning, afternoon highs reached seasonable mid and upper
50s. Expect another cool night tonight, but not quite as cool as
last night since the airmass over our region has begun to moderate
and high clouds are starting to increase.

Evening IR satellite imagery shows a band of clouds associated
with a frontal boundary extending from near the ca or border west-
southwest across the northeast pacific. Moisture within this
boundary is relatively plentiful with precipitable water values
approaching 1.5 inches. The models agree that this frontal
boundary will sag slowly to the southeast over the next 36 hours,
and bring rainfall to much of our forecast area from late Sunday
through early Monday. Recent model output has slowed the southward
progression of the boundary and thus delayed the onset of
precipitation. Rain is not expected to develop in the north bay
until mid-to-late afternoon Sunday, with rain then forecast to
gradually spread across most of the rest of the sf bay area by
late Sunday night. Rain may then reach as far south as the
monterey bay area by Monday morning before the frontal boundary
dissipates.

The bulk of the rainfall with this system is expected to be
generated by warm advection processes and fall across northern
california, generally north of i-80. Rainfall amounts are
projected to fall off precipitously to the south of i-80. In our
forecast area, only the north bay is expected to pick up
significant precipitation with this system. Rainfall will
initially be light in the north bay on Sunday afternoon, but rain
rates are then expected to increase Sunday evening with periods of
heavy rain possible across portions of the north bay from late
Sunday evening through late Sunday night. However, model rainfall
amounts have recently been trending lower. For instance,
yesterday the NAM and GFS were forecasting as much as 2.5 inches
of rain with this system in the north bay. Now, the latest nam
and GFS (00z runs) forecast maximum rainfall values of only about
half that much. And, rain totals across the north bay burn scars
are now forecast by the NAM and GFS to be only slightly more than
a half inch. Of course, these courser-scale models tend to miss
some of the orographic enhancement and therefore tend to
underestimate rainfall maxima. So we still could see locally as
much as 2 inches of rain in northwest sonoma county and as much as
an inch or more across the burn scars. In any event, concern for
debris flows flash flooding in and near the north bay burn scars
has decreased now that the models are trending somewhat drier.

Besides trending drier, the models have also shown a trend towards
less wind with this upcoming system. Southerly winds may gust
locally as high as 35 mph along the north bay coast late Sunday
afternoon and Sunday evening, but winds are not expected to reach
advisory levels.

Rain is expected to linger into Monday morning as the frontal
boundary dissipates over the southern portion of our area. Most
models end all rain by midday Monday. Dry weather is expected to
return by Monday afternoon and temperatures will be mild due to
lack of cold advection with this system.

Shortwave ridging is forecast to maintain dry and mild conditions
from Monday afternoon through Tuesday and Tuesday night. The next
system is expected to bring rain to our area area Wednesday and
Wednesday night. This midweek system is forecast drive a strong
cold front through our entire forecast area, which will mean a
potential for soaking rains regionwide. Brief heavy rain and locally
strong and gusty winds may also be factors with the midweek
system. Showers will linger into Thursday, with a return to dry
weather conditions expected by late in the week.

Aviation As of 3:59 am pst Sunday for 12z tafs. Current fog
product shows streaming high clouds overhead, with no signs of
stratus across the district. However, lastest ksts and kapc obs
are now reporting light patchy fog. Expect intermittent fog
through 15-16z for north bay terminals. Still monitoring for low
clouds fog development around the greater san francisco bay area
over the next couple of hour, hinted by the 00z mtrwrf model. Kept
tempo group in TAF for koak and ksfo through 15z, just in case.

Dewpoint depressions at ksfo and koak are 6f and 0f, respectively.

An upper level system approaching the bay area will introduce
rain beginning this afternoon for the north bay, therefore
lowering CIGS in the process. Current thinking is rain will begin
around or slightly after 00z Mon at ksts, then progress southward
through the sf bay area by 03-05z. It looks like rain will affect
monterey bay terminals after 12z mon. Rainfall may be moderate
and occasionally heavy at times. This will likely drop CIGS vsby
down to ifr or lifr during heavier showers. Winds are expected to
be mainly southwesterly southerly through the forecast period,
between 08-12 kt.

Vicinity of ksfo... Slight chance of MVFR CIGS through 15z this
morning. OtherwiseVFR expected through this afternoon. CIGS will
gradually lower through the afternoon and are expected to be MVFR
this evening. Light east southeast winds this morning will turn
more southerly southwesterly and increase by afternoon.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR conditions are expected to prevail
through the forecast period, with high cloud. Generally light
winds. Rain chances increase after 12z Monday.

Marine As of 2:35 am pst Sunday... Winds will increase and
become southwesterly later this morning, especially for the
northern coastal waters, ahead of an arriving weak cold front. The
cold front is forecast to pass through Monday morning and will
switch winds out of the north again. Small craft advisories are in
place for most coastal water zones mainly due to squared and
hazardous seas over the next couple of days. A new northwest swell
train arrives by this evening.

Mtr watches warnings advisories
Tday 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... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Sf bay from 3 pm
public forecast: dykema
aviation: bam
marine: bam
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 1 mi54 min S 2.9 G 4.1 42°F 55°F1026.4 hPa (+0.5)
AAMC1 - 9414750 - Alameda, CA 18 mi54 min E 4.1 G 5.1 44°F 54°F1025.9 hPa (+0.3)
LNDC1 19 mi54 min E 4.1 G 5.1 46°F 1025.8 hPa (+0.4)
OBXC1 21 mi54 min 47°F 43°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 21 mi54 min ESE 7 G 8.9
OKXC1 - 9414776 - Oakland (Berth 34), CA 21 mi54 min SE 5.1 G 7 45°F 1025.9 hPa (+0.4)
PXOC1 - 9414311 - San Francisco (Pier 1), CA 22 mi54 min ESE 9.9 G 12 48°F 1024.7 hPa (+0.3)
PXSC1 22 mi54 min 50°F 48°F
FTPC1 - 9414290 - San Francisco, CA 24 mi54 min SW 1 G 2.9 45°F 54°F1026 hPa (+0.3)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 28 mi60 min ESE 6 G 7 48°F 1026 hPa
46237 - San Francisco Bar, CA (142) 29 mi54 min 53°F8 ft
RCMC1 - 9414863 - Richmond, CA 30 mi54 min S 5.1 G 7 49°F 53°F1025.5 hPa (+0.4)
MZXC1 - 9415102 - Martinez-Amorco CA 36 mi54 min S 1.9 G 1.9 43°F 52°F1026 hPa (+0.6)43°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 37 mi54 min Calm G 1 45°F 1025.6 hPa (+0.4)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 38 mi64 min N 5.8 G 5.8 51°F 54°F10 ft1025.5 hPa (+0.3)
PCOC1 - 9415144 - Port Chicago, CA 38 mi54 min SSW 5.1 G 8 39°F 51°F1025.7 hPa (+0.5)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 38 mi64 min NNW 7.8 G 12 53°F 55°F12 ft1025.2 hPa (+0.3)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 40 mi60 min SSW 5.1 G 7 46°F 1025.6 hPa
SFXC1 - San Francisco Bay Reserve, CA 48 mi69 min WNW 1 37°F 1025 hPa37°F

Wind History for Redwood City, CA
(wind in knots)    EDIT      (on/off)   Help
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
2
AM
3
AM
4
AM
Last
24hr
W2
NW6
NW2
SE2
SE2
NE2
N3
G6
N3
G6
N5
G8
NW6
NW7
G11
NW10
W8
G11
SW6
W7
W6
W4
S1
SE1
S1
SE4
SE1
SE3
S3
1 day
ago
S1
SW3
SE2
S1
SE3
N3
N6
N4
NW11
W10
G14
W11
NW8
G13
W6
W6
W8
W5
W4
W6
W4
W5
NW5
NW4
W5
2 days
ago
S3
G6
SE3
E6
G11
SE4
E2
SW1
E3
S10
G13
SW7
W12
W12
G15
W7
W6
W5
G8
NW9
NW11
SW2
G7
SW9
SW8
SW7
W4
W5
SW5
W2

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Carlos Airport, CA3 mi59 minN 010.00 miFair39°F37°F93%1026.1 hPa
Mountain View, Moffett Field, CA10 mi58 minN 010.00 miFair39°F36°F89%1026.5 hPa
San Francisco, San Francisco International Airport, CA11 mi58 minN 010.00 miFair44°F37°F79%1025.8 hPa
Hayward, Hayward Air Terminal, CA11 mi60 minE 310.00 miFair39°F34°F82%1026.9 hPa
Oakland, Metro Oakland International Airport, CA12 mi61 minENE 310.00 miFair38°F37°F100%1026.2 hPa
Half Moon Bay Airport, CA16 mi59 minN 010.00 miFair39°F37°F93%1025.1 hPa
San Jose, San Jose International Airport, CA18 mi61 minSE 410.00 miFair40°F37°F89%1026.1 hPa
Livermore, Livermore Municipal Airport, CA24 mi61 minN 010.00 miFair34°F32°F92%1026.1 hPa

Wind History from SQL (wind in knots)
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
2
AM
3
AM
4
AM
5
AM
Last 24hrW3CalmCalmCalmCalmN5NE6N5N5NW11W12W7W5W5W6W5CalmCalmCalmCalmSE3CalmSE4Calm
1 day agoW3CalmCalmCalm4N5NE5N5NW7NW10N9W10
G14
W6W6W6W4W5W3W4CalmW3NW5NW3W4
2 days agoS4SW3CalmCalmCalmCalmS8S8W10SW10W8W7W6NW4NW8W4S4W5SW6W5W4CalmW3NW3

Tide / Current Tables for Redwood Creek entrance (inside), San Francisco Bay, California
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Redwood Creek entrance (inside)
Click for Map
Sun -- 03:48 AM PST     7.18 feet High Tide
Sun -- 07:19 AM PST     Sunrise
Sun -- 09:32 AM PST     2.75 feet Low Tide
Sun -- 10:03 AM PST     Moonrise
Sun -- 02:52 PM PST     7.19 feet High Tide
Sun -- 05:20 PM PST     Sunset
Sun -- 09:49 PM PST     0.49 feet Low Tide
Sun -- 09:56 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.94.566.97.26.75.74.53.42.82.83.54.75.96.97.26.85.94.531.60.70.51.1

Tide / Current Tables for Dumbarton Bridge, San Francisco Bay, California Current
   EDIT      (on/off)   Help   One Week of Data
Dumbarton Bridge
Click for Map
Sun -- 01:05 AM PST     1.60 knots Max Flood
Sun -- 05:06 AM PST     -0.00 knots Slack
Sun -- 07:09 AM PST     -0.75 knots Max Ebb
Sun -- 07:19 AM PST     Sunrise
Sun -- 09:47 AM PST     0.00 knots Slack
Sun -- 10:03 AM PST     Moonrise
Sun -- 01:08 PM PST     1.17 knots Max Flood
Sun -- 04:22 PM PST     -0.00 knots Slack
Sun -- 05:20 PM PST     Sunset
Sun -- 07:17 PM PST     -1.19 knots Max Ebb
Sun -- 09:55 PM PST     Moonset
Sun -- 10:18 PM PST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.41.61.51.10.60.1-0.5-0.7-0.6-0.30.10.50.91.210.70.2-0.3-0.9-1.2-1.1-0.7-0.20.4

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 (7,2,3,4)
      (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.