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Marine Weather and Tides
Version 3.4 |
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. 6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen |
| Sunrise 7:23AM | Sunset 6:24PM | Tuesday October 22, 2019 4:56 PM PDT (23:56 UTC) | Moonrise 12:00AM | Moonset 2:28PM | Illumination 31% |  |
PZZ530 San Pablo Bay, Suisun Bay, The West Delta And The San Francisco Bay North Of The Bay Bridge- 243 Pm Pdt Tue Oct 22 2019
Tonight..SW winds up to 10 kt.
Wed..NW winds up to 10 kt.
Wed night..N winds 5 to 10 kt with gusts up to 30 kt.
Thu..NE winds 5 to 15 kt with gusts up to 25 kt.
Thu night..NE winds around 5 kt.
Fri..NE winds around 5 kt.
Fri night..W winds around 5 kt.
Sat..NW winds up to 10 kt.
Sun..N winds 5 to 10 kt.
Tonight..SW winds up to 10 kt.
Wed..NW winds up to 10 kt.
Wed night..N winds 5 to 10 kt with gusts up to 30 kt.
Thu..NE winds 5 to 15 kt with gusts up to 25 kt.
Thu night..NE winds around 5 kt.
Fri..NE winds around 5 kt.
Fri night..W winds around 5 kt.
Sat..NW winds up to 10 kt.
Sun..N winds 5 to 10 kt.
PZZ500 243 Pm Pdt Tue Oct 22 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure over the eastern pacific and pacific northwest will produce moderate northerly winds across the coastal waters through midweek. The strongest winds are expected across the northern outer waters. As high pressure builds over the great basin, a thermal trough will develop along the coast. This will result in light offshore flow across the coastal waters. A moderate northwest swell will continue through midweek.
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure over the eastern pacific and pacific northwest will produce moderate northerly winds across the coastal waters through midweek. The strongest winds are expected across the northern outer waters. As high pressure builds over the great basin, a thermal trough will develop along the coast. This will result in light offshore flow across the coastal waters. A moderate northwest swell will continue through midweek.
7 Day Forecast for Marine Location Near Colma, CA
Hourly EDIT Helplocation: 37.68, -122.42 debug
Area Discussion for - San Francisco/Monterey Bay Area, CA
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus66 kmtr 222329 afdmtr area forecast discussion national weather service san francisco bay area 429 pm pdt Tue oct 22 2019 Synopsis A warming and drying trend will continue through the week as high pressure strengthens over california. Offshore flow will continue through midweek and strengthen Wednesday night into Thursday morning. This will result in warm temperatures reaching all the way to the coast, with the warmest temperatures expected on Thursday. Locally gusty offshore winds are likely at times in the hills, especially in the north bay hills on Wednesday night. In the longer range, cooling is forecast during the upcoming weekend, although another round of dry offshore winds is possible by late in the weekend and into early next week. Discussion As of 1:35 pm pdt Tuesday... With light offshore flow and sunny skies, afternoon temperatures have warmed into the upper 70s to mid 80s across the board. Earlier today the temperature rose to 86 degrees at the weather office in monterey, but a light seabreeze has cooled it back down to the mid 70s. The upper ridge is progged to weaken somewhat on Wednesday, so high temperatures should be similar to today's or slightly cooler. Highs are forecast to range from the mid to upper 70s at the coast, to the 80s to lower 90s inland. The warmest day is expected to be on Thursday when the ridge axis is centered over california. Highs that day are expected to be a couple degrees warmer than those expected on Wednesday. In addition to warming temperatures, the offshore flow will bring much drier air to the area. These factors coupled with increasing winds in the hills will produce critical fire weather potential. Red flag warnings have been issued for the north and east bay, plus the santa cruz mountains. Please see the fire weather discussion below for the specifics. The offshore surface pressure gradient will weaken by Friday as the upper level ridge weakens. High temperatures will moderate going into the weekend as an upper level trough moves across the pacific nw. This trough is then forecast to dig into the great basin setting up another potential offshore flow event for Sunday. Temperatures to remain near seasonal normals through the early part of next week. Aviation As of 04:29 pm pdt Tuesday... For 00z tafs.VFR conditions to prevail as high pressure and light offshore winds keep clear skies over the terminals through the forecast period. Onshore winds around 10-15 kt this afternoon along the coast with offshore winds inland. Winds will diminish in the overnight hours. Similar winds expected tomorrow afternoon. Vicinity of ksfo...VFR. Onshore winds 10-15 kt will persist into the early evening before winds diminish. Expect winds to turn offshore again tomorrow morning, but remain fairly light. Onshore winds to return by tomorrow afternoon. Sfo bridge approach... Similar to ksfo. Monterey bay terminals...VFR. W to NW winds around 5 to 15 kt will diminish and turn southerly overnight. Onshore winds to return tomorrow afternoon. |
Fire weather As of 12:45 pm pdt Tuesday... All fire weather watches have been upgraded to red flag warnings. In addition the north bay coast and valleys were added to the warning as well as the east bay interior valleys. Timing is to for warnings to start in the north bay first, around midday weds which accounts for the peak daytime heating as well as the synoptic timing of the wind event. In a subtle but important break from normal the winds do start to arrive before sunset and the development of the usual nighttime inversions. This should allow some of the winds to be noticed by weds afternoon and evening across the north bay hills as well as down into the valleys. The strongest offshore winds then sweep over the rest of the east bay and santa cruz mountains weds night into Thursday morning. The event looks to be on the moderate to a low end "high event" in terms of intensity. Cool advection and upper forcing for downward momentum look marginal with the best surface pressure gradient over the sierra. However winds at the 925 mb (ridgetop) level look strong and we will be going into the event after several hot weather days with very low humidity. In fact humidity values should slowly drop through the night weds into early Thursday morning. Fuel analysis shows all fuel components: live, dead, fine, heavy, etc ready for consumption. Climatology and fire history including the oakland hills fire (oct 19 20th 1991) as always send an important message worth studying to avoid repeat performances. Red flags are up through Thursday afternoon. Winds will rapidly ease by Thursday evening. However, humidity will remain very low right through Friday with continued light offshore winds. Given the ongoing impacts seems the prudent thing to do will be to let the red flag end by Thursday and then ride through the long duration low humidity time frame when ignitions will still be likely but easier to catch. All eyes then turn towards a potentially stronger event Saturday night into Sunday. Model spreads at 4-5 day window still large enough to keep confidence in the moderate category. However, potential is there for high end wind event. Pressure gradients looks much stronger with cold advection and upper support suggesting more widespread wind potential. Current timing suggests late Saturday night into Sunday. Temperatures would be cooler with humidity perhaps slightly higher but winds potentially much stronger. We realize there becomes public and fire manager fatigue factor in dealing with multiple events and discerning the different intensity levels. During the fall of 2017 we had 2-3 moderate intensity red flag events before the devastating wine country fires. Should we be lucky enough to get through tomorrows wind event would ask for continued vigilance heading into the weekend wind event. Marine As of 02:43 pm pdt Tuesday... High pressure over the eastern pacific and pacific northwest will produce moderate northerly winds across the coastal waters through midweek. The strongest winds are expected across the northern outer waters. As high pressure builds over the great basin, a thermal trough will develop along the coast. This will result in light offshore flow across the coastal waters. A moderate northwest swell will continue through midweek. Mtr watches warnings advisories Tngt Sca... Pt arena to pigeon pt 10-60 nm sca... Pt arena to pt reyes 0-10 nm sca... Pt pinos to pt piedras blancas 0-10 nm sca... Pigeon pt to pt piedras blancas 10-60 nm public forecast: sims aviation: as marine: st fire weather: walbrun visit us at |
Weather Reporting Stations
EDIT (on/off) Help NOTE: Click on distance to see the station location on a mapWind History for Alameda, CA
(wind in knots) EDIT (on/off) Help| 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 | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | |
| Last 24hr | W | W | N | N | -- | N | E | NE | N | N | -- | E | N | NW | E G4 | N | NW | NW | NW | NW | W | S | W | W |
| 1 day ago | W | W | W | W | W | W G7 | NW | E | E | E | E | -- | E | E | E | E | SE | S | SW | SE | E | W | SW | SW |
| 2 days ago | SW | SW | E | E | E | SE | SE | E | E | E | E | N | -- | NW | N | N G8 | NW G9 | N G8 | NW | W | W | SW | W G10 | SW |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports. Follow links for more data.| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| San Francisco, San Francisco International Airport, CA | 5 mi | 2 hrs | Var 3 | 10.00 mi | A Few Clouds | 77°F | 54°F | 45% | 1018.8 hPa |
| Oakland, Metro Oakland International Airport, CA | 11 mi | 63 min | W 8 | 10.00 mi | A Few Clouds | 80°F | 52°F | 38% | 1018.7 hPa |
| Half Moon Bay Airport, CA | 12 mi | 61 min | NNW 13 | 10.00 mi | Fair | 73°F | 46°F | 38% | 1019 hPa |
| San Carlos Airport, CA | 14 mi | 2.2 hrs | WNW 8 | 10.00 mi | Clear | 84°F | 39°F | 20% | 1019.3 hPa |
| Hayward, Hayward Air Terminal, CA | 16 mi | 62 min | WNW 9 | 10.00 mi | Fair | 84°F | 46°F | 27% | 1019.1 hPa |
| Palo Alto Airport, CA | 21 mi | 69 min | NE 5 | 10.00 mi | Clear | 79°F | 53°F | 42% | 1019 hPa |
Link to 5 minute data for KSFO
Wind History from SFO (wind in knots)
| 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 | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | |
| Last 24hr | W | W | W | NW | SW | Calm | W | NW | W | S | Calm | Calm | Calm | Calm | Calm | N | N | NE | N | N | E | W | ||
| 1 day ago | W | W | W | W | W | W | W | W | SW | SW | W | Calm | S | SW | Calm | W | Calm | Calm | Calm | NE | N | E | W | |
| 2 days ago | W | W | W | W | W | W | NW | NW | Calm | NW | Calm | SW | Calm | NW | SW | S | Calm | Calm | E | E | W | W | W | W |
Tide / Current Tables for South San Francisco, San Francisco Bay, California
EDIT Weekend mode (on/off) (on/off) Help One Week of DataSouth San Francisco
Click for Map
Tue -- 12:49 AM PDT Moonrise
Tue -- 01:35 AM PDT 0.09 feet Low Tide
Tue -- 07:24 AM PDT Sunrise
Tue -- 08:56 AM PDT 6.03 feet High Tide
Tue -- 02:13 PM PDT 2.89 feet Low Tide
Tue -- 03:27 PM PDT Moonset
Tue -- 06:22 PM PDT Sunset
Tue -- 07:35 PM PDT 6.46 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Tue -- 12:49 AM PDT Moonrise
Tue -- 01:35 AM PDT 0.09 feet Low Tide
Tue -- 07:24 AM PDT Sunrise
Tue -- 08:56 AM PDT 6.03 feet High Tide
Tue -- 02:13 PM PDT 2.89 feet Low Tide
Tue -- 03:27 PM PDT Moonset
Tue -- 06:22 PM PDT Sunset
Tue -- 07:35 PM PDT 6.46 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
| 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 |
| 0.8 | 0.2 | 0.1 | 0.7 | 1.6 | 2.7 | 3.9 | 5 | 5.8 | 6 | 5.7 | 4.9 | 4 | 3.3 | 2.9 | 3.1 | 3.7 | 4.7 | 5.7 | 6.3 | 6.4 | 5.9 | 4.9 | 3.5 |
Tide / Current Tables for Sierra Point 1.3 mi ENE, South San Francisco Bay, California Current
EDIT (on/off) Help One Week of DataSierra Point 1.3 mi ENE
Click for Map
Tue -- 12:49 AM PDT Moonrise
Tue -- 01:57 AM PDT 0.01 knots Slack
Tue -- 05:15 AM PDT 0.94 knots Max Flood
Tue -- 07:24 AM PDT Sunrise
Tue -- 08:51 AM PDT -0.01 knots Slack
Tue -- 11:20 AM PDT -0.63 knots Max Ebb
Tue -- 02:23 PM PDT 0.00 knots Slack
Tue -- 03:27 PM PDT Moonset
Tue -- 05:10 PM PDT 0.59 knots Max Flood
Tue -- 06:22 PM PDT Sunset
Tue -- 07:59 PM PDT -0.00 knots Slack
Tue -- 11:32 PM PDT -1.20 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Tue -- 12:49 AM PDT Moonrise
Tue -- 01:57 AM PDT 0.01 knots Slack
Tue -- 05:15 AM PDT 0.94 knots Max Flood
Tue -- 07:24 AM PDT Sunrise
Tue -- 08:51 AM PDT -0.01 knots Slack
Tue -- 11:20 AM PDT -0.63 knots Max Ebb
Tue -- 02:23 PM PDT 0.00 knots Slack
Tue -- 03:27 PM PDT Moonset
Tue -- 05:10 PM PDT 0.59 knots Max Flood
Tue -- 06:22 PM PDT Sunset
Tue -- 07:59 PM PDT -0.00 knots Slack
Tue -- 11:32 PM PDT -1.20 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
| 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 |
| -0.8 | -0.4 | 0 | 0.4 | 0.8 | 0.9 | 0.9 | 0.7 | 0.4 | -0.1 | -0.4 | -0.6 | -0.6 | -0.4 | -0.1 | 0.2 | 0.5 | 0.6 | 0.5 | 0.3 | -0 | -0.4 | -0.9 | -1.2 |
Weather Map
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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
Wind Forecast for San Francisco/Monterey Bay Area, CA (19,4,5,8)
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Ground Weather Radar Station San Francisco Bay Area, CA
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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. |