Marine Weather and Tides
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.
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.
|Sunrise 7:02AM||Sunset 7:20PM||Thursday March 22, 2018 2:46 AM PDT (09:46 UTC)||Moonrise 9:41AM||Moonset 11:57PM||Illumination 30%|
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|PZZ565 Point Pinos To Point Piedras Blancas To 10 Nm- 940 Pm Pdt Wed Mar 21 2018 |
.small craft advisory in effect through Thursday evening...
Tonight..SE winds 15 to 25 kt. Wind waves 4 to 6 ft. NW swell 2 to 4 ft at 13 seconds and sw 3 to 5 ft at 10 seconds. Rain.
Thu..S winds 15 to 25 kt. Wind waves 4 to 6 ft. W swell 3 to 4 ft at 12 seconds...shifting to the nw 5 to 6 ft at 13 seconds in the afternoon. SWell S 3 to 4 ft. Rain in the morning, then showers likely and slight chance of Thunderstorms in the afternoon.
Thu night..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 7 to 8 ft at 12 seconds and S 3 ft at 11 seconds. Slight chance of showers in the evening.
Fri..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 6 to 7 ft at 11 seconds and S 3 ft at 10 seconds.
Fri night..W winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 6 to 8 ft at 11 seconds. Slight chance of showers in the evening. Chance of showers after midnight.
Sat..W winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 8 to 10 ft...becoming 8 to 9 ft. Chance of showers.
Sun..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 9 to 11 ft. Chance of showers.
Mon..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 6 to 8 ft...decreasing to 5 to 6 ft.
|PZZ500 940 Pm Pdt Wed Mar 21 2018 |
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A cold front will arrive in the northern waters early Thursday morning and move southeastward over the coastal waters and bays into the afternoon. Instability will result in showers, heavy at times, and a few Thunderstorms late tonight and Thursday. Winds will become northwest behind the cold front Thursday. Hazardous sea conditions will continue in a mixed swell into Friday. It'll be unseasonably chilly by Thursday night and continue chilly into this weekend.
7 Day Forecast for Marine Location Near San Simeon, CAHourly EDIT Help
Area Discussion for - San Francisco/Monterey Bay Area, CA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus66 kmtr 220600|
area forecast discussion
national weather service san francisco bay area
1100 pm pdt Wed mar 21 2018
Synopsis Periods of moderate to locally heavy rainfall will
continue today through early Thursday afternoon as an atmospheric
river takes aim at the california coast. Breezy to locally gusty
southerly winds will also be possible ahead of a cold front that
will sweep through the region Thursday morning. After a brief break
in rainfall late Thursday, additional showers and cooler
temperatures will be possible from Friday into the weekend before
dry conditions return next week.
Discussion As of 9:30 pm pdt Wednesday... Moist low-level flow
brought orographic rain to the coastal hills all day today while
daytime heating allowed for scattered afternoon showers around the
inland areas. Lightning detection indicated strikes in northern
san luis obispo county and in the central valley but none in our
cwa as cloudcover may have inhibited the development of deep
Forecast is on track as radar is showing the plume of very moist
air getting pulled north as an upper trough approaches from the
northwest. Already seeing rain rates of 1 2 inch per hour at
three peaks in the southern santa lucia. The big sur mountains are
set to get the most rain with 3-5 inches with local amounts of
6-8 inches. The santa cruz and north bay mountains should see 2-4
inches while 1 2 to 1 inch is expected in the lowlands.
Models depict a well defined cold front that is forecast to move
through the north bay after 15z and the sfo bay area after 18z.
Given the synoptic set up this front could be a narrow cold-
frontal rainband. Ncfrs are notorious for intense rain rates and
possible thunderstorms. This is where we will need to monitor for
the possibility of debris flows if there is a burst of intense
rain. Other flooding concerns include minor flooding of urban and
small streams but mainstem flooding is unlikely.
Southerly winds will increase overnight and there could be gusts
to 35-45 mph just ahead of the front. A dramatic wind shift to the
west-northwest is expected with the frontal passage.
Showers will decrease during the afternoon Thursday but there is
still the slight chance of thunderstorms in the unstable airmass.
Dry conditions are expected Thursday night with lows dropping
into the mid to upper 30s in the colder areas and low to mid 40s
in the sfo bay area. This is about 10-15 degrees below tonights
Another upper level low drops down from the pacific northwest this
weekend. A frontal system moves through Friday night followed by
showers for Saturday and Sunday morning. This system is forecast
to move inland rather quickly and will have less moisture so
rainfall will not be excessive.|
Medium and long range models show this will be the last storm to
impact the area for an extended period of time with dry weather
from Sunday night through all of next week.
Aviation As of 11:00 pm pdt Wednesday... Deteriorating weather
conditions are developing with areas ifr lifr forecast tonight
into Thursday. Kmux radar shows rain coverage increasing late this
evening with convection forecast to ramp up later tonight into
Thursday with an active day of radar monitoring for us here at the
wfo (and likely neighboring offices).
A cold front moving southeast at about 20 mph within a sharp and
well defined trough arrives in the north bay Thursday morning and
continues to press southeastward clearing the north central coast
late Thursday. Humid air prior to the cold front will produce
moderate to higher levels of convective potential Thursday, mu
capes approaching 500-1000 j kg. The storm prediction center has
most if not all of our forecast area included in a general
thunderstorm outlook valid until march 23rd 12z. Will amend tafs
as needed for specific convection based on radar, satellite, and
Vicinity of ksfo... Se winds becoming gusty overnight and Thursday
morning, and rain will be heavy at times. Thursday's convection will
need to be monitored closely. Post frontal winds become w-nw and gusty
Thursday afternoon and evening.
Sfo bridge approach... Similar to ksfo.
Monterey bay terminals... Se winds becoming gusty overnight into
Thursday, and rain will be heavy at times. Thursday's convection
will need to be monitored closely. Post frontal winds become w-nw
and gusty Thursday afternoon and evening.
Marine As of 10:40 pm pdt Wednesday... A cold front will arrive
in the northern waters early Thursday morning and move southeastward
over the coastal waters and bays into the afternoon. Instability
will result in showers, heavy at times, and a few thunderstorms
late tonight and Thursday. Winds will become northwest behind the
cold front Thursday. Hazardous sea conditions will continue in a
mixed swell into Friday. It'll be unseasonably chilly by Thursday
night and continue chilly into this weekend.
Mtr watches warnings advisories
Tngt Sca... Sf bay
sca... Mry bay
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
public forecast: W pi mm
aviation marine canepa
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Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
|Stations||Dist||Age||Wind||Air Temp||Water Temp||Waves||Pressure||DewPt|
|46028 - CAPE SAN MARTIN - 55NM West Northwest of Morro Bay, CA||6 mi||56 min||SSE 16 G 19||57°F||55°F||7 ft||1010 hPa (-1.4)|
|46239 - Point Sur, CA (157)||51 mi||46 min||54°F||7 ft|
|46215 - Diablo Canyon, CA (076)||58 mi||49 min||56°F||6 ft|
Wind History for Port San Luis, CA(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Paso Robles Municipal Airport, CA||62 mi||53 min||W 4||1.75 mi||Heavy Rain Fog/Mist||59°F||59°F||100%||1010.7 hPa|
Wind History from PRB (wind in knots)
|1 day ago||Calm||Calm||SE||SE||SE||Calm||W||Calm||SW||W||NW||Calm||Calm||W||NW||Calm||E||SE||E||Calm||E||SE||Calm||SE|
|2 days ago||NE||Calm||Calm||NE||Calm||NE||Calm||N||E||E|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|San Simeon |
Click for Map
Thu -- 01:44 AM PDT 4.99 feet High Tide
Thu -- 07:05 AM PDT Sunrise
Thu -- 08:54 AM PDT 0.32 feet Low Tide
Thu -- 10:38 AM PDT Moonrise
Thu -- 03:21 PM PDT 3.25 feet High Tide
Thu -- 07:18 PM PDT Sunset
Thu -- 08:06 PM PDT 2.09 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
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|Morro Beach |
Click for Map
Thu -- 01:39 AM PDT 4.68 feet High Tide
Thu -- 07:04 AM PDT Sunrise
Thu -- 08:45 AM PDT 0.46 feet Low Tide
Thu -- 10:38 AM PDT Moonrise
Thu -- 03:04 PM PDT 2.99 feet High Tide
Thu -- 07:17 PM PDT Sunset
Thu -- 07:55 PM PDT 1.87 feet Low Tide
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 (5,6,7,8)(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.