Marine Weather and Tides
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
|Sunrise 5:47AM||Sunset 8:34PM||Friday June 22, 2018 4:19 AM PDT (11:19 UTC)||Moonrise 2:33PM||Moonset 1:31AM||Illumination 66%|
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|PZZ530 San Pablo Bay Suisun Bay The West Delta And San Francisco Bay North Of The Bay Bridge- 242 Am Pdt Fri Jun 22 2018 |
Today..SW winds 10 kt...increasing to 10 to 20 kt in the afternoon.
Tonight..SW winds 10 to 20 kt.
Sat..SW winds 5 to 15 kt.
Sat night..SW winds 10 to 20 kt.
Sun..SW winds 15 to 25 kt. Patchy fog after midnight.
Mon..W winds 5 to 15 kt. Patchy fog.
Tue..W winds 10 to 20 kt.
|PZZ500 242 Am Pdt Fri Jun 22 2018 |
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A strong area of high pressure over the eastern pacific will maintain moderate to strong northerly winds across the coastal waters through late Saturday night. The strongest winds will be located over the northern outer waters, north of pigeon point. These sustained strong winds will produce relatively large and steep winds waves on top of a building northwesterly swell with moderate periods. Winds will decrease Sunday as a southerly surge moves up the coast, but remain breezy along the inner coastal waters.
7 Day Forecast for Marine Location Near Ladera, CAHourly EDIT Help
Area Discussion for - San Francisco/Monterey Bay Area, CA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus66 kmtr 220523|
area forecast discussion
national weather service san francisco bay area
1023 pm pdt Thu jun 21 2018
Synopsis A robust warming trend is forecast from tomorrow into
late Saturday as high pressure builds off the west coast. This
will lead to hot conditions on Saturday with moderate to locally
high heat risks across mainly inland portions of the region.
Additionally, winds will turn offshore, bringing heightened fire
weather concerns to parts of the area on Saturday. Cooling will
commence on Sunday along with the redevelopment of the marine
layer for early next week.
Discussion As of 8:35 pm pdt Thursday... Warming occurred
across most of our region today as onshore flow began to diminish.
The most pronounced warming today occurred in sonoma county and
in san francisco - locations in which today's highs were about
ten degrees warmer than yesterday. Warming in other locations was
more subtle. Low clouds cleared from almost our entire coast this
afternoon, with just a small patch of low clouds currently
located over the monterey peninsula.
Low level flow remains onshore this evening and latest WRF model
data indicates that areas of low clouds will likely develop in
coastal areas once again overnight, mainly south of the golden
gate. A relatively steep pressure gradient down the coast from acv
to sfo, as well as a shallow marine layer (about 1000 feet deep),
will mean low clouds will mostly remain confined to areas near
the ocean overnight. Also, low clouds are expected to clear from
most coastal areas by late Friday morning.
The warming trend that began tentatively today will become more
widespread and intensify on Friday as an upper ridge builds over
california and as onshore flow continues to weaken. High
temperatures tomorrow are forecast to climb into the upper 60s and
70s near the ocean, into the upper 70s and 80s around san
francisco bay... And into the 90s to around 100 in the inland
valleys. Heat risks will begin to climb across inland areas
tomorrow, but a relatively cool start to the day will mean most
areas will remain in low to moderate heat risk categories.
The warming trend will continue into Saturday as the upper ridge
amplifies just offshore. Subsidence under the ridge will compress
the marine layer to a very shallow depth and keep marine air
confined to the immediate coast. Also, onshore flow is forecast to
become very weak by Friday night and Saturday morning, while
light to moderate offshore winds develop just off the surface.
These factors will result in a continuation of the warming trend
into Saturday. Saturday is expected to be the warmest day of the
upcoming heat event, with highs expected to climb into the 70s and
80s near the ocean and bays... And from the 90s to 105 inland. The
hot daytime temperatures inland on Saturday, combined with warmer
nighttime temperatures on Friday night, especially in the hills,
will result in more widespread moderate heat risks on Saturday,
with heat risks expected to rise into the high category across
the warmest inland areas. A heat advisory is in effect for most
inland portions of the san francisco bay area and monterey bay
area from 11 am to 8 pm Saturday.
From previous discussion... In addition to the heat, dry offshore
winds, primarily over the north and east bay mountains hills above
1000 ft, on the order of 15 to 30 mph with gusts up to or
exceeding 40 mph will couple with the heat to create severe fire
weather conditions for some areas. Humidity values will hover in
the upper single digits to mid teens for the driest spots on
Saturday and Sunday, with poor overnight recoveries expected. A
fire weather watch is now in effect from midday Saturday through
Sunday evening for the increased risk of fire starts and rapid
fire growth, for more information please see the sforfwmtr text
product. Be mindful of these fire weather conditions and avoid any
activities that may lead to fire starts, such as lawn or
automotive work, driving motorized vehicles on dry grass, lighting
campfires or fireworks, or discarding hot or burning objects such
as lighter coils or cigarettes.
A southerly surge is forecast to occur on Sunday which will bring
gusty south winds along the coast, first from big sur, then
spreading northward along the central coast towards the san mateo|
coast and beyond. In addition to gusty south winds, a resurgent
marine layer will accompay the push northward, pushing into south
facing coastal areas like santa cruz and the marin headlands
before expanding deeper inland. As the southerly surge arrives, it
will lead to a significant drop in temperature as the surface
environment shifts from the dry hot inland air mass to the
cool moisture marine air mass. North facing coastal areas will be
the last to see any cooling impacts from the southerly surge.
These southerly surges are fairly common in the aftermath of a hot
streak across our area. The exact timing and magnitude of this
particular southerly surge should come into focus within the next
model run or two. Stay tuned for more info on how much it will
help us cool off later Sunday and early next week!
Aviation As of 10:30 pm pdt Thursday... Surface flow becoming
more northerly tonight with the acv-sfo pressure grdient at 6 mb.
Satellite image shows stratus is backing off from the coast with
just patchy clouds in the mry peninsula. Model guidance still
brings ifr CIGS into mry after 09z but is less certain about sns.
Vicinity of ksfo...VFR.
Sfo bridge approach... Similar to sfo.
Monterey bay terminals... CIGS over the mry peninsula still
expected to get into mry after 09z. CIGS spreading into sns after
11z but confidence is low as clouds could stay out all night.
Due to a compressed marine layer there may be reduced vsbys to
1-3 miles early Friday morning. Any CIGS will clear early withVFR
after 16z or 17z.
Fire weather As of 11:34 am pdt Thursday... Fire weather watch
has been issued for the north and east bay hills from 11 am
Saturday through 8 pm Sunday evening. The main concern is hot
temperatures and low humidity coupled with some moderate north dry
winds. To be clear the weather set-up is very different and not
nearly as critical in terms of winds to the north bay firestorm
Hot temps will develop on Friday and continue to dry out fuels
that are currently running near average in terms of seasonal
dryness. After a mild and dry night Friday another hot day is in
store Saturday with lots of 90s and even some triple digit heat
forecast. As this occurs some dry north winds will come down the
sac valley and first spread over napa county Saturday morning.
Wind gusts should be in the 35-45 mph range. Winds will ease
Saturday afternoon and then another round of north winds will
spread over the north and east bay hills Saturday night. This will
coincide with little or no rh recovery and very warm overnight
temps in the 70s and 80s. Warm to hot weather will continue into
Sunday afternoon but onshore flow will return by late in the day.
Those spending time outside this weekend are urged to be vigilant
with sources of ignition. Any new fire starts, especially in the
grassy fuels will spread rapidly.
Marine As of 10:10 pm pdt Thursday... High pressure building
over the eastern pacific will maintain moderate to strong
northerly winds across the coastal waters through Saturday night.
These sustained strong winds will produce relatively large and
steep winds waves on top of a building northwesterly swell with
moderate periods. Winds will decrease Sunday as a southerly surge
moves up the coast.
Mtr watches warnings advisories
Tngt Sca... Mry bay until 12 am
sca... Pigeon pt to pt pinos 0-10 nm until 12 am
sca... Pt arena to pt reyes 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm until 3 am
public forecast: dykema mm
aviation: W pi
marine: W pi
fire weather: rww
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Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
Wind History for Redwood City, CA(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|San Carlos Airport, CA||9 mi||24 min||N 0||10.00 mi||Fair||57°F||50°F||77%||1014.6 hPa|
|Mountain View, Moffett Field, CA||9 mi||83 min||ENE 3||10.00 mi||Fair||58°F||54°F||87%||1014.9 hPa|
|San Jose, San Jose International Airport, CA||15 mi||26 min||N 0||10.00 mi||Fair||59°F||53°F||81%||1014.4 hPa|
|San Francisco, San Francisco International Airport, CA||17 mi||83 min||WNW 9||10.00 mi||A Few Clouds||56°F||48°F||77%||1014.4 hPa|
|Half Moon Bay Airport, CA||17 mi||24 min||N 0||7.00 mi||Overcast||48°F||46°F||94%||1015.6 hPa|
|Hayward, Hayward Air Terminal, CA||19 mi||25 min||NE 3||10.00 mi||Fair||57°F||48°F||74%||1015.4 hPa|
|Oakland, Metro Oakland International Airport, CA||21 mi||26 min||SW 7||10.00 mi||Fair||57°F||54°F||90%||1014.5 hPa|
Wind History from PAO (wind in knots)
|1 day ago||Calm||SE||N||N||N||N||NW||N||NW||NW|
|2 days ago||NW||Calm||N||N||N||NW||NW|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Redwood City |
Click for Map
Fri -- 02:30 AM PDT Moonset
Fri -- 03:33 AM PDT 1.00 feet Low Tide
Fri -- 05:48 AM PDT Sunrise
Fri -- 09:13 AM PDT 5.84 feet High Tide
Fri -- 02:59 PM PDT 1.36 feet Low Tide
Fri -- 03:33 PM PDT Moonrise
Fri -- 08:33 PM PDT Sunset
Fri -- 09:25 PM PDT 8.76 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Dumbarton Point 2.3 mi NE |
Click for Map
Fri -- 01:40 AM PDT -1.01 knots Max Ebb
Fri -- 02:30 AM PDT Moonset
Fri -- 04:19 AM PDT 0.00 knots Slack
Fri -- 05:47 AM PDT Sunrise
Fri -- 07:01 AM PDT 1.04 knots Max Flood
Fri -- 09:46 AM PDT -0.01 knots Slack
Fri -- 01:52 PM PDT -0.72 knots Max Ebb
Fri -- 03:32 PM PDT Moonrise
Fri -- 04:09 PM PDT 0.00 knots Slack
Fri -- 07:00 PM PDT 1.18 knots Max Flood
Fri -- 08:32 PM PDT Sunset
Fri -- 09:53 PM PDT -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Weather Map and Satellite Images(on/off)  HelpWeather Map
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 (7,2,3,4)(on/off)  Help
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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.