Marine Weather and Tides
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 7:12AM||Sunset 5:18PM||Thursday January 18, 2018 5:33 AM PST (13:33 UTC)||Moonrise 8:17AM||Moonset 7:04PM||Illumination 3%|
EDIT (on/off)  Help
|PZZ670 Point Piedras Blancas To Point Sal From 10 To 60 Nm- 310 Am Pst Thu Jan 18 2018 |
.small craft advisory in effect through late Saturday night...
Today..NW winds 10 to 20 kt. Wind waves 2 to 3 ft. W swell 8 to 11 ft at 20 seconds, building rapidly to 14 to 17 ft at 20 seconds by afternoon. Patchy dense fog with vsby 1 nm or less in the morning. Slight chance of rain in the afternoon.
Tonight..NW winds 15 to 25 kt. Combined seas 15 to 18 ft dominant period 18 seconds, building to 17 to 19 ft dominant period 17 seconds after midnight. Chance of rain.
Fri..NW winds 15 to 25 kt. Combined seas 17 to 19 ft dominant period 16 seconds, subsiding to 15 to 17 ft dominant period 15 seconds in the afternoon. Chance of showers. Slight chance of Thunderstorms in the afternoon.
Fri night..NW winds 20 to 30 kt. Combined seas 14 to 16 ft dominant period 15 seconds. Slight chance of Thunderstorms in the evening. Chance of showers.
Sat..NW winds 20 to 30 kt. Combined seas 12 to 14 ft dominant period 15 seconds.
Sat night..NW winds 20 to 30 kt, becoming N 10 to 20 kt after midnight. Combined seas 12 to 14 ft dominant period 14 seconds, subsiding to 7 to 9 ft dominant period 14 seconds after midnight.
Sun..NW winds 10 to 15 kt. Wind waves 2 ft. NW swell 7 to 9 ft. Slight chance of rain.
Mon..NW winds 10 to 15 kt. Wind waves 2 ft. NW swell 9 to 12 ft. Slight chance of rain.
|PZZ600 310 Am Pst Thu Jan 18 2018 |
Synopsis for the southern california coast and santa barbara channel including the channel islands national marine sanctuary and national park..At 10z...or 2 am pst...a 1024 mb high was located 500 nm sw of point conception. A 964 mb low was located 500 nm west of vancouver. Very large W to nw swell will overspread the water today and persist into the weekend. Strong nw winds will affect much of the waters Fri through Sat.
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 181205|
area forecast discussion
national weather service san francisco bay area
405 am pst Thu jan 18 2018
Synopsis A weather system approaching form the northwest will
spread rain across the north bay this morning and then southward
across the remainder of the forecast area by this evening.
Scattered showers are forecast for Thursday night and Friday as
much colder air settles over the region. A few showers may linger
into early Saturday morning, but for the most part Saturday
should be a dry day. The next front will bring rain chances late
Sunday into Monday.
Discussion As of 3:15 am pst Thursday... Latest satellite
imagery shows a cold frontal boundary approaching the northern
california coast this morning. Models forecast light rain to begin
spreading into the north bay this morning then reach the northern
san francisco bay area by late morning then across the rest of
the sf bay area by mid-afternoon and then into the monterey bay
area by late afternoon. Rain will turn to scattered showers
Thursday night and Friday after the front passes. The best chance
for showers will be Friday morning when the upper trough is moving
southeast across the coastal waters towards southern california.
The flow will be northwest by then so shower chances are a little
higher along the coast.
Colder air will settle into the area with 850 mb temps dropping
from about 12 degrees c currently to -2 degrees c by Friday
morning. Cold air instability will bring a slight chance of
thunderstorms along the north bay coast and the coastal waters
where the trough will be passing through. Snow level will drop as
low as 3500 feet by Friday but by then there will only be scattered
light showers so only a dusting of snow is expected. Rainfall
amounts from this system will range from 1 2 inch in the north
bay... 1 4 inch around the san francisco bay area... And 1 10 inch
from monterey bay area south. Up to 3 4 inch is possible in the
Lingering showers Friday night should remain over the waters.
Clearing skies will lead to a cold night with lows dropping to
the mid to upper 30s in the inland valleys.
Another system from the northwest will bring a chance of rain to
the north bay Sunday afternoon and the san francisco bay area
Sunday night. The front washes out as it moves southeast with rain
only getting as far as the monterey bay area Monday morning.
Rainfall amounts could be locally moderate in the north bay but
light elsewhere. The system is fast-moving so hydro issues are|
Medium range models show another fast-moving system moving through
around the middle of next week. But after that an upper level
ridge will build off the coast leading to an extended dry period.
Aviation As of 3:54 am pst Thursday... For 12z tafs... Widespread
ifr lifr CIGS & vsbys across the district this morning as an
upper level trough and cold front approach from the northwest. The
trough will introduce some rain and showers this morning. In
fact, ksts is already reporting -ra as of 1130z. Expect rain to
move north to south through the morning, becoming widespread by
this afternoon. Showers will linger this evening and into Friday.
S SW winds will turn westerly this afternoon.
Vicinity of ksfo... Lifr to vlifr conditions will prevail through
at least 15z, perhaps later, with vsbys down to 1 2sm-2sm and
fog at times. Wet runways by late morning or early afternoon,
with low confidence on exact timing. Light winds.
Sfo bridge approach... Similar to ksfo.
Monterey bay terminals... Lifr vlifr expected through the morning.
Ksns still reporting clr skies. Will have to see if low clouds
make it through the salinas valley later on this morning. Rain
will begin around 22z-00z Thursday afternoon. Light winds.
Marine As of 02:35 am pst Thursday... A large long period
westerly swell will continue to impact the coastal waters through
the remainder of the week. This swell will bring hazardous seas to
the region as well as large breaking waves to the coastline
through Friday. A cold front will pass over the waters later this
morning, switching winds out of the west or northwest by this
afternoon or evening. Rain chances will increase through the
morning and will continue through the weekend.
Mtr watches warnings advisories
Tday High surf warning... Sonoma county coast to monterey
sca... Mry bay
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... Pigeon pt to pt piedras blancas 10-60 nm
sca... Pt arena to pt reyes 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Rough bar advisory for sf bar
public forecast: W pi
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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||43 min||WNW 9.7 G 12||56°F||57°F||8 ft||1019.6 hPa (-1.2)|
|46239 - Point Sur, CA (157)||51 mi||33 min||57°F||9 ft|
|46215 - Diablo Canyon, CA (076)||58 mi||36 min||58°F||7 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||40 min||SSE 4||10.00 mi||Fair||44°F||42°F||93%||1020.3 hPa|
Wind History from PRB (wind in knots)
|1 day ago|
|2 days ago|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|San Simeon |
Click for Map
Thu -- 04:05 AM PST 2.46 feet Low Tide
Thu -- 07:12 AM PST Sunrise
Thu -- 08:14 AM PST Moonrise
Thu -- 10:07 AM PST 5.53 feet High Tide
Thu -- 05:18 PM PST Sunset
Thu -- 05:22 PM PST -0.46 feet Low Tide
Thu -- 07:01 PM PST Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Morro Beach |
Click for Map
Thu -- 04:06 AM PST 1.98 feet Low Tide
Thu -- 07:10 AM PST Sunrise
Thu -- 08:12 AM PST Moonrise
Thu -- 10:14 AM PST 5.45 feet High Tide
Thu -- 05:17 PM PST Sunset
Thu -- 05:23 PM PST -0.42 feet Low Tide
Thu -- 07:00 PM PST Moonset
Thu -- 11:52 PM PST 3.66 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Weather Map and Satellite Images(on/off)  Help
|Weather Map ||IR Satellite Image from GEOS|
GOES Local Image of CentralWestCoast EDIT
Wind Forecast for San Francisco/Monterey Bay Area, CA (8,2,3,4)(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.