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Marine Weather and Tides
Version 3.4 |
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 5:46AM | Sunset 8:35PM | Wednesday June 20, 2018 9:59 PM PDT (04:59 UTC) | Moonrise 12:30PM | Moonset 12:27AM | Illumination 53% |  |
Marine Forecasts
EDIT (on/off) Help| PZZ531 San Francisco Bay South Of The Bay Bridge- 849 Pm Pdt Wed Jun 20 2018 Tonight..W winds 10 to 20 kt. Thu..W winds 5 to 15 kt. Thu night..W winds 5 to 15 kt. Fri..W winds 5 to 15 kt. Fri night..W winds 5 to 15 kt. Sat..W winds 10 kt. Sun..SW winds 5 to 15 kt. Mon..SW winds 10 kt. Patchy fog. | PZZ500 849 Pm Pdt Wed Jun 20 2018 Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A 1023 mb high pressure was located about 650 miles west of Monterey bay. This high will move north and strengthen Thursday and Friday. Gusty northwest winds are expected along much of the waters through Thursday. Strongest winds will shift north on Friday. Gale force winds will be possible over the northern outer waters Friday night. A light southerly wind will develop along the big sur coast Sunday. |
7 Day Forecast for Marine Location Near Belmont, CA
Hourly EDIT Helplocation: 37.52, -122.28 debug
Area Discussion for - San Francisco/Monterey Bay Area, CA
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus66 kmtr 210424 afdmtr area forecast discussion national weather service san francisco bay area 924 pm pdt Wed jun 20 2018 Synopsis Not much change in weather conditions through Thursday, then a pronounced warming trend at the end of the week and into the first part of the weekend as high pressure builds in and winds turn more offshore. Cooling temperatures and redevelopment of the marine layer appears in store for Sunday into the first part of next week as flow shifts back onshore. Discussion As of 9:20 pm pdt Wednesday... Brisk onshore flow kept temperatures on the cool side of normal today across most of our region. Onshore flow overnight will allow low clouds to develop around san francisco bay and into the coastal valleys. However, the marine layer is relatively shallow with a depth around 1200 feet, so it's unlikely we will see widespread low clouds develop inland overnight. Thursday is expected to be a day much like today with low clouds clearing back to the coast by midday. The models indicate a slight reduction in onshore flow tomorrow as a weak shortwave trough over far northern california moves off to the east. Thus, high temperatures tomorrow will likely be a few degrees warmer than today in most places. A robust warming trend is forecast to get underway on Friday as an upper ridge amplifies just off the west coast and as onshore flow diminishes. Coastal temperatures will warm into the upper 60s and 70s on Friday, while inland areas warm into the upper 80s and 90s. A few triple digit highs may occur in the warmest locations on Friday. Saturday is expected to be the warmest day as the ridge axis edges closer to the coast and light offshore flow briefly develops. Coastal temperatures are difficult to forecast for Saturday since much will depend on the strength and duration of offshore flow. Downtown san francisco is currently expected to warm into the low to mid 80s on Saturday, while san francisco oceanside may remain in the 60s. Inland temperatures are forecast to climb well into the 90s to 105 on Saturday. Heat advisories may be needed for Saturday when potential heat risks climb into the high category for some inland areas. From previous discussion... Another thing to mention for the late Friday to Saturday timeframe is the potential for gusty winds in the higher elevations. The GFS does advertise north to northeast winds for the north and east bay hills mountains that could produce elevated fire weather concerns. Will continue to monitor these forecast trends, especially as we approach the event when the higher resolution models are able to capture this with finer detail. Models for Sunday suggest the start of what would be a welcomed cooling trend across the interior heading into next week. The latest GFS run even brings in what could be a southerly surge along the big sur coast, pushing north toward the santa cruz and |
san mateo coasts through the day. Additional cooling is expected for much of the region -- especially interior locations -- heading into next week. Aviation As of 7:30 pm pdt... Marine layer is a little shallower than yesterday and sits around 1000 feet. Moderate northwest onshore flow continues with stratus along the coast. Once again there is an early push of stratus into sfo but web cams indicate there is more clouds around than this time yesterday. Still expecting tempo CIGS to back off after 04z returning after 10z. But it is possible clouds will stay in. Vicinity of ksfo... Tempo MVFR through 04z with west winds gusting 25-27 kt. Ifr CIGS return after 11z. Sfo bridge approach... Similar to ksfo. Monterey bay terminals... Stratus along point pinos will spread into mry early tonight reaching sns after 04z. CIGS MVFR at first lowering to ifr during the evening. Fire weather As of 3:30 pm pdt Wednesday... A pronounced warming and drying trend is forecast for the end of the week as high pressure builds in and winds turn offshore. Saturday presently looks to be the hottest day, with poor overnight relative humidity recoveries for both Friday night and Saturday night. Locally gusty north to northeast winds are possible in the north and east bay hills Friday night and Saturday morning. A return to cooling and redevelopment of the marine layer appears in store for Sunday into the first part of next week as flow shifts back onshore. Marine As of 8:49 pm pdt Wednesday... A 1023 mb high pressure was located about 650 miles west of monterey bay. This high will move north and strengthen Thursday and Friday. Gusty northwest winds are expected along much of the waters through Thursday. Strongest winds will shift north on Friday. Gale force winds will be possible over the northern outer waters Friday night. A light southerly wind will develop along the big sur coast Sunday. Mtr watches warnings advisories Tngt Sca... Pt reyes to pigeon pt 0-10 nm sca... Pigeon pt to pt pinos 0-10 nm 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 from 12 am glw... Pt pinos to pt piedras blancas 0-10 nm until 12 am sca... Mry bay until 12 am sca... Sf bay until 9 pm public forecast: dykema mm aviation: W pi marine: W pi fire weather: blier rowe visit us at |
Weather Reporting Stations
EDIT (on/off) Help NOTE: Click on distance to see the station location on a mapWind History for Redwood City, CA
(wind in knots) EDIT (on/off) Help| 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 | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | |
| Last 24hr | NW | NW | NW G9 | NW | NW | W | W G12 | W G14 | W | W | NW | NW | N | N | N G14 | N | NW G16 | NW G16 | NW G17 | NW G16 | W | W | NW | W |
| 1 day ago | N | NW | NW | NW | NW | NW | NW | NW | NW | NW | N | NW | NW | N G12 | NW G14 | NW G17 | NW G19 | N G15 | NW | NW G15 | NW G16 | W | W | NW |
| 2 days ago | W | NW | W | SE G4 | SE G6 | N G7 | NW G9 | N G13 | N G11 | NW G17 | NW G17 | NW | NW | N | NW G15 | NW G15 | NW |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| San Carlos Airport, CA | 2 mi | 72 min | W 8 | 10.00 mi | A Few Clouds | 57°F | 48°F | 72% | 1016.3 hPa |
| San Francisco, San Francisco International Airport, CA | 8 mi | 63 min | W 16 G 21 | 10.00 mi | Mostly Cloudy | 58°F | 50°F | 75% | 1016.2 hPa |
| Palo Alto Airport, CA | 9 mi | 72 min | NNW 10 | 10.00 mi | Clear | 59°F | 50°F | 72% | 1016.3 hPa |
| Half Moon Bay Airport, CA | 12 mi | 64 min | NW 11 G 15 | 10.00 mi | Overcast | 55°F | 51°F | 88% | 1017.3 hPa |
| Hayward, Hayward Air Terminal, CA | 13 mi | 65 min | W 6 | 10.00 mi | Overcast | 58°F | 51°F | 78% | 1017.4 hPa |
| Oakland, Metro Oakland International Airport, CA | 13 mi | 66 min | W 16 | 10.00 mi | Mostly Cloudy | 56°F | 52°F | 87% | 1016.3 hPa |
| Mountain View, Moffett Field, CA | 14 mi | 63 min | NNE 7 | 10.00 mi | Fair | 59°F | 54°F | 83% | 1016.8 hPa |
| San Jose, San Jose International Airport, CA | 21 mi | 66 min | NW 8 | 10.00 mi | A Few Clouds | 60°F | 51°F | 72% | 1016.4 hPa |
Wind History from SQL (wind in knots)
| 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 | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | |
| Last 24hr | NW | NW | NW | NW | NW | NW | W | W | NW | NW | W | NW | N | N | N | N | NW | W | W | W | W G17 | W | W | W |
| 1 day ago | NW | NW | NW | NW | NW | NW | NW | W | NW | NW | N | N | N | N | W | N G14 | W | W | W G14 | W | NW | NW | ||
| 2 days ago | NW | W | W | Calm | Calm | Calm | N | W | Calm | Calm | Calm | NE | NW | N | N | W | W | NW | NW | NW | NW | NW | NW |
Tide / Current Tables for Smith Slough, San Francisco Bay, California
EDIT RT Ports Option Weekend mode (on/off) (on/off) Help One Week of Data| Smith Slough Click for Map Thu -- 01:59 AM PDT Moonset Thu -- 03:11 AM PDT 1.50 feet Low Tide Thu -- 05:48 AM PDT Sunrise Thu -- 08:15 AM PDT 6.29 feet High Tide Thu -- 02:32 PM PDT Moonrise Thu -- 02:46 PM PDT 0.78 feet Low Tide Thu -- 08:33 PM PDT Sunset Thu -- 09:08 PM PDT 8.01 feet High Tide Tide / Current data from XTide NOT FOR NAVIGATION |
| 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
| 4.1 | 2.8 | 1.9 | 1.5 | 1.8 | 2.9 | 4.3 | 5.6 | 6.3 | 6.1 | 5.4 | 4.3 | 2.9 | 1.7 | 1 | 0.8 | 1.4 | 2.6 | 4.3 | 6 | 7.4 | 8 | 7.7 | 6.8 |
Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
EDIT (on/off) Help One Week of Data| San Mateo Bridge Click for Map Thu -- 01:59 AM PDT Moonset Thu -- 03:17 AM PDT 0.01 knots Slack Thu -- 05:47 AM PDT Sunrise Thu -- 05:55 AM PDT 1.13 knots Max Flood Thu -- 08:55 AM PDT -0.00 knots Slack Thu -- 11:58 AM PDT -1.10 knots Max Ebb Thu -- 02:32 PM PDT Moonrise Thu -- 03:12 PM PDT 0.00 knots Slack Thu -- 06:13 PM PDT 1.53 knots Max Flood Thu -- 08:33 PM PDT Sunset Thu -- 09:31 PM PDT -0.00 knots Slack Tide / Current data from XTide NOT FOR NAVIGATION |
| 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
| -1.2 | -1.1 | -0.8 | -0.2 | 0.5 | 1 | 1.1 | 1 | 0.6 | -0 | -0.6 | -1 | -1.1 | -1 | -0.7 | -0.1 | 0.6 | 1.3 | 1.5 | 1.5 | 1.1 | 0.4 | -0.3 | -0.9 |
Weather Map and Satellite Images
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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 (0,6,7,8)
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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. |