Tuesday, September29, 2020
Privacy Policy
L-36.com

Marine Weather and Tides
Sereno del Mar, CA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 7:04AMSunset 6:57PM Tuesday September 29, 2020 5:59 AM PDT (12:59 UTC) Moonrise 5:28PMMoonset 3:52AM Illumination 92% Phase: Waxing Gibbous; Moon at 12 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
PZZ540 Coastal Waters From Point Arena To Point Reyes California Out To 10 Nm- 403 Am Pdt Tue Sep 29 2020
Today..S winds up to 10 kt. Wind waves 1 ft. NW swell 5 to 7 ft at 16 seconds and sw 2 to 3 ft at 19 seconds. Patchy dense fog this afternoon.
Tonight..W winds up to 10 kt. Wind waves 1 ft. NW swell 5 to 6 ft at 14 seconds and sw 2 to 3 ft at 18 seconds. Patchy dense fog.
Wed..NW winds 5 to 15 kt. Wind waves 1 ft. W swell 4 to 5 ft at 12 seconds and sw 2 to 3 ft at 18 seconds.
Wed night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 1 to 2 ft. W swell 3 to 5 ft at 12 seconds and sw 2 to 3 ft at 16 seconds.
Thu..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 1 to 2 ft. W swell 3 to 5 ft at 11 seconds and sw 2 to 3 ft at 16 seconds.
Thu night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 1 to 2 ft. W swell 7 to 8 ft at 16 seconds and sw around 2 ft at 15 seconds.
Fri..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 5 to 7 ft and sw around 2 ft.
Sat..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 5 to 6 ft and sw around 2 ft.
PZZ500 403 Am Pdt Tue Sep 29 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Winds generally light and southerly today before turning westerly on Tuesday. Northwest winds will redevelop by mid-week. Seas will mainly be a mix of moderate northwest swell and a longer period, light southerly swell.


7 Day Forecast for Marine Location Near Sereno del Mar, CA
   Hourly   EDIT   Help
location: 38.4, -123.09     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
FXUS66 KMTR 291218 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 518 AM PDT Tue Sep 29 2020

SYNOPSIS. A cooling trend along the coast and around the Bays on Tuesday but with very warm to hot weather continuing across inland areas through much of the work week. Cooling is expected to develop inland over the upcoming weekend.

DISCUSSION. as of 4:08 AM PDT Tuesday . Overnight satellite imagery tells the tale of two stories - a weak southerly surge nosing its way northward and several heat signatures from wildfires across the state. The southerly surge from Monday continues to make its northerly push and is now north of Pt Arena. Inland push of the surge has been minimal, except for the Salinas Valley. It's not too surprising the inland push is struggling as there is still a moderate offshore gradient. Yes, the gradient has weakened substantially, but at nearly 8 mb from WMC-SFO it's still there. The lingering offshore gradient is helping to produce some breezy conditions in the North Bay Mts and East Bay Hills. More importantly, the offshore flow is keeping very dry air and mild temps in place over the higher terrain early this morning. The biggest impact will be to fire weather concerns. See fire weather section for more details.

For today - Salinas Valley low clouds and patchy fog will roll back to the coast by mid morning. Clouds will linger along the coast for much of the day keeping the cooling trend going along the coast/bays. Away from the coast will still be warm to locally hot with highs 90s to near 100 degs or 10-20 deg above normal. The overall breezy conditions in the hills will continue to weaken through the day as well as the offshore gradients continues to decrease. Needless to say, but smoke impacts will be a problem again today with ongoing fires. The latest smoke models bring widespread upper level smoke to the region from ongoing fires near the Sierra. Locally and closer to the surface, fires in the North Bay will likely contribute to air quality issues across the North Bay. Fortunately, model guidance does suggest that the surge and southerly flow will keep a majority of the low level smoke out of San Francisco and areas south. For the latest on air quality forecast please consult Bay Area Air Quality Management District.

The large scale details do not change much for the rest of the work week, but some of the finer details do. The large upper level high remains anchored over the West. This upper ridge is much stronger than normal for this time of year. In fact, the latest EPS and GFES depict it being several standard deviations above normal. It's also interesting to note that the ridge is robust and extends northward into W Canada and E Alaska. The 00Z runs also show a re-strengthen of the ridge by Wednesday and more so on Thursday. This building upper ridge will help to squish any remaining marine layer. 850 mb temps remain above normal and warm a few more degrees. So what does this mean for the Bay Area? The brief cooling near the coast today will be reversed on Wednesday and Thursday. Inland heat will increase over the next few days. Temperatures across the interior were bumped up a few degrees on both WEdnesday and Thursday. Could see a few more places reaching the low 100s on Thursday than previously forecast. Some of the MOS guidance pushes temperatures to near 106 for Livermore on Thursday. As always, coastal areas will be challenging thanks to some local onshore flow. Heat Risk concerns increase on Wednesday with interior locations in the moderate to high category. By Thursday, a heat advisory may be need for the interior.

Minor cooling is expect on Friday as the ridge eases a tad. Additional cooling expected over the weekend as the ridge breaks down even further.

Delving into fantasy land the ECM/GFS get rather interesting late in the weekend and next week. It is 2020 after all so stay tuned. Newly formed Tropical Depression 18-E (S of Baja) tracks northward on the western periphery of the weakening ridge. As this happens an anomalously low upper level trough moves into the PacNW next week. The leftover tropical moisture gets advected eastward and possibly into over CA as the PacNW trough moves eastward. If you're having a flashback it's eerily similar in the broader sense to the second push of moisture the brought a few lightning strikes to the region around August 22/23. Very low confidence, but something to watch.

AVIATION. as of 5:17 AM PDT Tuesday . For the 12z TAFs. Marine layer has compressed substantially from earlier in the evening - now only 400 ft AGL at both Fort Ord and Bodega Bay. This is bringing heavy fog to coastal areas and terminals. KMRY, KWVI and KHAF all reporting vis 1/4 mi or less. Aside from the Salinas Valley, areas further inland are VFR. The finger of stratus that entered through the GG bridge earlier has not made any movement around the Bay. Thus, expecting VFR to continue for SF Bay terminals through the day. Smoke remains in the TAFs due to wildfires in the North Bay. Surface vis will be affected mainly for KSTS but slant range vis issues may be seen in other Bay Area terminals throughout the day. Mostly VFR around the region with an afternoon seabreeze. Enough of a marine layer will remain in place to bring stratus to terminals overnight into Wednesday morning.

Vicinity of KSFO . VFR. WNW winds around 7 kt continuing through morning and becoming breezy this afternoon. Stratus/fog remains along the coast. A few/sct clouds may enter KSFO area, but otherwise VFR continues. HRRR smoke model forecasts little smoke at the surface today but area terminals may have slant range visibility issues upon approach. Return of stratus into the San Francisco Bay is forecast for late Tuesday night.

SFO Bridge Approach . Possible slant-range vis issues with smoke and haze. Otherwise, similar to KSFO.

Monterey Bay Terminals . LIFR with dense fog and low cigs for coastal terminals and Salinas Valley. Fog clearing and cigs lifting after 16z. VFR expected Tuesday with onshore breezy winds in the afternoon. IFR cigs return Tuesday evening with fog possible overnight once again.

CLIMATE. Here are record high temperatures for Wednesday and Thursday .

. WEDNESDAY THURSDAY SANTA ROSA . 102 in 1980 . 102 in 1980 KENTFIELD . 95 in 1966 . 97 in 2012 NAPA . 100 in 1980 . 106 in 1980 RICHMOND . 96 in 2001 . 99 in 1980 LIVERMORE . 100 in 2012 . 102 in 1952 SAN FRANCISCO . 96 in 2001 . 97 in 1980 SF AIRPORT . 94 in 2001 . 97 in 1980 REDWOOD CITY . 95 in 2001 . 103 in 1980 HALF MOON BAY . 92 in 2001 . 83 in 2014 OAKLAND DOWNTOWN . 98 in 1980 . 103 in 1980 SAN JOSE . 94 in 2001 . 97 in 1980 GILROY . 98 in 2010 . 104 in 2001 SANTA CRUZ . 98 in 1978 . 102 in 1965 SALINAS . 99 in 2001 . 105 in 1980 KING CITY . 105 in 1980 . 109 in 1980

FIRE WEATHER. as of 4:40 AM PDT Tuesday . For the latest official information on active wildfires and firefighting efforts with regards to evacuations, please refer to CALFIRE and your local Sheriffs Office.

Satellite imagery and webcams continue to show the Glass Fire continues to burn actively overnight. Compared to 24 hours ago conditions have improved with slightly higher RH and cooler temps. Then again, yesterday was an extreme situation. Currently temperatures near the fire remain mild with little in the way of humidity recovery (less than 30%) overnight. Winds have dropped from their peak a day ago, but still some breezy conditions over the highest peaks. Today will be another hot and relatively dry day. Winds are projected to remain offshore through afternoon before switch to onshore. The wind switch will help to bring some higher humidity air to the low elevations of the fire, especially near Santa Rosa. On the flip side, the change in direction could also push the fire in new directions. Fortunately the wind doesn't look overly strong.

The bigger story for the next few days over the Glass Fire will be the re-building of the ridge midweek. Hot and dry conditions will get turned up a notch Wednesday and a little more on Thursday. Additionally, winds at 2500' increase Wednesday night and Thursday, especially the Napa/Sonoma county line. Obviously the hot and dry conditions will impact the fire itself, but as heat risk concerns increase impacting fire personnel working the fire on Wednesday and Thursday.

MARINE. as of 04:03 AM PDT Tuesday . Winds generally light and southerly today before turning westerly on Tuesday. Northwest winds will redevelop by mid-week. Seas will mainly be a mix of moderate northwest swell and a longer period, light southerly swell.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. None.

PUBLIC FORECAST: MM AVIATION: Lorber/Canepa MARINE: Canepa FIRE WEATHER: MM

Visit us at www.weather.gov/sanfrancisco

Follow us on Facebook, Twitter, and YouTube at: www.facebook.com/nwsbayarea www.twitter.com/nwsbayarea www.youtube.com/nwsbayarea


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
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 15 mi39 min SSE 5.8 G 9.7 55°F 55°F1014.9 hPa
46214 - Point Reyes, CA (029) 38 mi63 min 58°F5 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 47 mi39 min S 3.9 G 7.8 57°F1015.7 hPa
ANVC1 - 9416841 - Arena Cove, CA 48 mi59 min E 6 G 8.9 53°F 52°F1014.4 hPa (+0.0)
46237 - San Francisco Bar, CA (142) 49 mi59 min 58°F4 ft
RCMC1 - 9414863 - Richmond, CA 49 mi59 min SE 1 G 1.9 62°F 66°F1014.6 hPa (-0.0)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 49 mi60 min Calm 60°F 1015 hPa

Wind History for Point Reyes, CA
(wind in knots)    EDIT      (on/off)   Help
Last
24hr
1 day
ago
2 days
ago

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Santa Rosa, Santa Rosa Sonoma County Airport, CA17 mi66 minNW 39.00 miFair51°F50°F96%1014 hPa

Link to 5 minute data for KSTS

Wind History from STS (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 24hrNW4NW3NW4CalmCalmCalmCalmCalmCalmCalmCalmS6S7SE4S3S4CalmCalmCalmCalmSE3CalmCalmNW3
1 day agoCalmNW4S5NW34S43N5--5E9E10E5SE6S4S3CalmCalmCalmCalmS4S4W3N4
2 days agoSW3CalmCalmN7N13N12N9N7N10
G17
N14N15NW17
G20
NW15
G22
NW12
G20
NW17
G22
N13NW15
G21
N9N9N9NE8N7N7Calm

Tide / Current Tables for Bodega Harbor entrance, California
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Bodega Harbor entrance
Click for Map
Tue -- 04:22 AM PDT     0.40 feet Low Tide
Tue -- 04:52 AM PDT     Moonset
Tue -- 07:06 AM PDT     Sunrise
Tue -- 10:53 AM PDT     5.20 feet High Tide
Tue -- 04:42 PM PDT     1.83 feet Low Tide
Tue -- 06:27 PM PDT     Moonrise
Tue -- 06:57 PM PDT     Sunset
Tue -- 10:26 PM PDT     5.41 feet High Tide
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
4.12.91.70.80.40.51.123.14.255.24.94.23.32.41.91.92.3344.85.35.3

Tide / Current Tables for Salt Point, California Current
   EDIT      (on/off)   Help   One Week of Data
Salt Point
Click for Map
Tue -- 01:59 AM PDT     -1.16 knots Max Ebb
Tue -- 04:53 AM PDT     Moonset
Tue -- 05:38 AM PDT     0.00 knots Slack
Tue -- 07:08 AM PDT     Sunrise
Tue -- 08:46 AM PDT     1.06 knots Max Flood
Tue -- 11:41 AM PDT     -0.00 knots Slack
Tue -- 02:35 PM PDT     -0.86 knots Max Ebb
Tue -- 05:50 PM PDT     0.00 knots Slack
Tue -- 06:28 PM PDT     Moonrise
Tue -- 06:58 PM PDT     Sunset
Tue -- 08:47 PM PDT     0.89 knots Max Flood
Tue -- 11:31 PM PDT     -0.00 knots Slack
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
-0.7-1.1-1.2-1.1-0.8-0.40.20.711.10.90.4-0.2-0.6-0.8-0.9-0.7-0.40.10.50.80.90.70.3

Weather Map
       (on/off)   Help Weather Map
wmap_P
GEOS 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
Ground Weather Radar Station Sacramento, CA
   (on/off)   Help
weather_mapweather_map weather_map


Cookie Policy:
This website uses cookies to save your settings. No personal information is saved. I do not collect statistics on your visit. You can disable cookies in your browser if you like but it is not recommended for this site. I do not sell cookies. Go to a bakery for that. In fact I do not sell anything. To disable cookies from L-36.com, please refer to the Help button in your browser.
Privacy Policy:
I do not sell or share any user data or anything else for that matter. The only personal information I save is in the site log which has a line for each page view which includes the IP address your browser sends in the header as well as which page you requested. I use this to block hackers and other bad actors. I do not use this raw data to create profiles on users. I periodically delete the log files. Google supplies the ads on this site. Because I do not track who you are, I cannot customize how these ads are served. They may be personalized to improve the ad experience. If you do not want personalized ads, please adjust the settings on the Google site HERE.
. NOTE: The best I can determine, this site is not subject to CCPA but I am doing my best to comply anyway. 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 numerous 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.