|
Marine Weather and Tides
Version 3.4 |
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 6:23AM | Sunset 8:02PM | Saturday August 15, 2020 9:37 AM PDT (16:37 UTC) | Moonrise 1:36AM | Moonset 4:50PM | Illumination 11% |  |
PZZ531 San Francisco Bay South Of The Bay Bridge- 814 Am Pdt Sat Aug 15 2020
Today..NW winds 5 to 15 kt.
Tonight..W winds 5 to 15 kt. A slight chance of showers and Thunderstorms.
Sun..W winds 5 to 15 kt. A slight chance of showers and Thunderstorms.
Sun night..W winds 5 to 15 kt.
Mon..W winds 10 to 20 kt with gusts up to 25 kt.
Mon night..W winds 5 to 15 kt.
Tue..W winds 10 to 20 kt with gusts up to 25 kt.
Wed..W winds 10 to 20 kt with gusts up to 25 kt. Winds and wind waves higher in and near Thunderstorms.
Today..NW winds 5 to 15 kt.
Tonight..W winds 5 to 15 kt. A slight chance of showers and Thunderstorms.
Sun..W winds 5 to 15 kt. A slight chance of showers and Thunderstorms.
Sun night..W winds 5 to 15 kt.
Mon..W winds 10 to 20 kt with gusts up to 25 kt.
Mon night..W winds 5 to 15 kt.
Tue..W winds 10 to 20 kt with gusts up to 25 kt.
Wed..W winds 10 to 20 kt with gusts up to 25 kt. Winds and wind waves higher in and near Thunderstorms.
PZZ500 814 Am Pdt Sat Aug 15 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light west to northwest winds will prevail across the coastal waters this morning. Locally breezy afternoon and evening winds are expected along coastal gaps, particularly near santa cruz and along the big sur coast south of point sur. There will be a slight chance of scattered Thunderstorms tonight and tomorrow over the waters, mainly for the southern waters. Winds will increase slightly early next week as high pressure builds off the coast. Mixed seas will continue with a short period northwest swell and a couple of longer period southerly swells.
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light west to northwest winds will prevail across the coastal waters this morning. Locally breezy afternoon and evening winds are expected along coastal gaps, particularly near santa cruz and along the big sur coast south of point sur. There will be a slight chance of scattered Thunderstorms tonight and tomorrow over the waters, mainly for the southern waters. Winds will increase slightly early next week as high pressure builds off the coast. Mixed seas will continue with a short period northwest swell and a couple of longer period southerly swells.
7 Day Forecast for Marine Location Near San Leandro, CA
Hourly EDIT Helplocation: 37.68, -122.17 debug
Area Discussion for - San Francisco/Monterey Bay Area, CA
(on/off) Help NOTE: mouseover dotted underlined text for definitionFXUS66 KMTR 151144 AFDMTR
Area Forecast Discussion National Weather Service San Francisco Bay Area 444 AM PDT Sat Aug 15 2020
SYNOPSIS. Dangerously hot temperatures with Excessive Heat Warnings inland and Heat Advisories around the Bay with record or near record heat possible again today. Little relief along the coast as the marine layer will be very shallow with only light onshore breezes. Isolated dry lightning is also possible across the region late today into early Sunday. The ridge responsible for the hot weather will stay in place through next week.
DISCUSSION. as of 3:45 AM PDT Saturday . An oppressive, prolonged heatwave is now underway not only for our local area but across much of the western CONUS. Widespread record breaking temperatures were observed yesterday regionwide and afternoon temperatures easily exceeded triple digits readings across the interior with pockets of mid 90s to around 100 even near the coast. Forecast model data has struggled to keep up with this oppressive heat along the coastal interface and as a result the forecast will constantly be reevaluated and action taken as necessary. An afternoon sea breeze did eventually pick up along the immediate coast mid to late yesterday afternoon which helped to bring some limiting cooling, however, many areas away from the coast or at higher elevations are still struggling to cool overnight. This lack of overnight cooling relief can lead to accumulating heat stress and should be taken seriously during prolonged heat events such as this one.
At the synoptic scale, there are two primary weather systems that will play a role in our weather through the weekend. The first and most prominent is the 597dm 500mb high pressure system centered roughly over Arizona which is slowly expanding into California from the southeast. Hot stagnant air trapped beneath this dome of high pressure first encroached on the region Thursday night which then set the stage for Fridays historic heat which broke temperature records across the region. This high pressure system will gradually strengthen to 600dm at 500mb as it retrogrades towards Vegas and further builds into the local area through next week, resulting in continued oppressive heat, especially across the interior through next week. To the west, a 579dm 500mb low pressure system is colliding with the northwestern perimeter of the oppressive high pressure ridge. This low pressure system will bring about a brief cooling trend between Friday and Saturday and again on Saturday on Sunday as it nudges the perimeter of the hot dry air under the ridge farther eastward, likely making Sunday the coolest day throughout the entirety of the prolonged heatwave. However, as this occurs, a surge of moisture at 700-500mb aloft will be advected in from the south in the southerly flow between these features later today, tonight, and into Sunday morning. Elevated convective parameters meet critical thresholds to spark the potential for fast moving, high based convection of which some isolated thunderstorms may develop and move across the area from south to north. Given the dry fuels and hot, drying air mass in place, any isolated lightning strikes could lead to new wildfire starts. In addition, due to both the high based and fast northward progression, little if any precipitation will accompany lightning strikes at the surface, suggesting that isolated dry lightning will be the main outcome of any elevated convection through the coming days. As a result, in coordination with the neighboring offices, a fire weather watch has been issued for the potential of isolated dry lightning Saturday PM to Sunday AM. Those paying close attention may notice that there are two fire weather watches for our area, which have been segmented by GACC coverage (regional fire offices) and likely timing of arrival of highest MUCAPE/Modified Total Totals/PWAT values.
Lightning risk aside, heat risk will be the broader societal impact again on Saturday. The excessive heat watches across the interior (including the urban areas of the East and South Bay valleys) continue to remain in effect through the prolonged heatwave with expected peak temperature for today again in the low to mid 100s, locally in the upper 100s. In addition to the excessive heat warning across the interior, we plan to issue targeted daily heat advisories for the nearshore and coastal zones as needed. Friday showed how oppressive this heatwave can be and even the highest ensemble members of the hottest forecast models struggled to encapsulate the full extent of yesterdays record breaking heat along the coastal to inland interface. Given this experience and the warm overnight temperatures in place to start the day today, made several passes on the forecast temperatures and nudged nearly all of Saturday's forecast temperatures higher in the coastally influenced sites that may have been too cool. Noticeably warmer temperatures are now in place for today along the San Francisco Bayshore and for the city itself, however, Saturday is not expected to be nearly as hot as Friday by a margin of a few to several degrees, though not many days are capable of such heat. As such, heat advisories are in place for today for all of the same locations they were in place by the last update around lunchtime yesterday. This includes, the North Bay valleys including Santa Rosa and Napa, the San Francisco Bayshore, including Oakland and Silicon Valley, San Francisco itself, the Santa Cruz mountains including Scotts Valley, the northern Monterey Bay including Santa Cruz and Watsonville, and the southern Monterey Bay including Big Sur. Some locations in today's heat advisory may not fall within criteria of the heat advisory however other portions of a zone will, ie Big Sur Station will likely be much warmer than Pacific Grove. Likewise, the higher hills and east to southeastern portion of San Francisco are much warmer than the west side of town. Overall, these temperatures are 10 to 25 degrees above seasonal normals, depending on the location.
The most important weather shift to watch for today will be subtle shifts in wind direction as afternoon sea breezes are expected to develop once again this afternoon. As with many previous heat events, coastally influenced communities may hit their maximum daytime temperature as early as 1130am before winds shift onshore and cooler air from the nearshore waters advects in and begins to counterbalance the warmer air inland. This occurred yesterday at Carmel, for example, which peaked in the mid 90s before noon when the wind shifted. For today, watching for wind shifts towards the west will be key in determining maximum temperatures for the day and is one key reason days like yesterday are difficult to nail both for the models and human forecasters, as even the slightest of onshore breezes result in significant temperature shifts over the course of an hour or two.
Looking ahead, the upper low off the coast weakens and is ejected out of the area late Sunday into early Monday which allows the high pressure system to further strengthen and recenter itself north of Vegas over the Great Basin. Consequently, high pressure will be in total control of the weather pattern and hot stagnant air will result in increasing temperatures from Monday into mid week next week, likely the next peak in the prolonged heat wave. This forecast shift nudged up the forecast maximum temperatures somewhat for the Tuesday to Wednesday timeframe however expect further increases as we near this time frame. Medium to long term models suggest a potential for this high pressure to remain the primary weather driver across the western CONUS through next weekend. We will continue to closely monitor both the heat and fire weather risk over the coming week and add or update any watches, warnings, and advisories as the data requires it. Generally after a few days of extreme heat, we see hints of a southerly wind reversal and return of a shallow but vigorous marine layer first over the Central Coast and then into Bay Area, however, still nothing of that sort expected in the nearterm.
AVIATION. as of 04:42 AM PDT Friday . for 12Z TAFs. VFR through the TAF period. Winds are currently light, but Saturday afternoon will see traditional onshore breezy conditions, before subsiding at night. As monsoonal moisture continues to move over the region on Saturday, high clouds are expected across the sky. There is a slight chance for an isolated elevated shower Saturday afternoon, but there is low confidence and should mostly be over the ocean or far enough to the east.
Vicinity of KSFO . VFR. Light, onshore winds, will begin to increase and become breezy Saturday afternoon. High clouds are expected over the terminal for much of the day, but remaining VFR throughout the TAF period with subsiding winds Saturday evening. Low confidence in the chance for storm development, but VCTS was added to KLVK as models are showing some development in the eastern portion of the region in the late afternoon. Storm development will be monitored and removed if necessary.
SFO Bridge Approach . Similar to KSFO.
Monterey Bay Terminals . VFR with calm winds. As moisture from the south moves over the area, expect increasing number of high clouds, but the terminals will remain VFR through Saturday. Winds will increase and become breezy Saturday afternoon. With the influx of moisture, models have indicated a chance for isolated storms popping up, but there is low confidence in it developing. A VCTS group was added to KSNS for Saturday afternoon, and will be monitored/removed if storms end up not forming.
CLIMATE. Record High Temperatures with the upcoming heat event. August 15 August 16 ----------------------------------------- Santa Rosa 103, 2019; 100, 2019; Kentfield 101, 2019; 101, 2015; Napa 102, 1906; 104, 2015; Richmond 91, 2019; 94, 2015; Livermore 108, 1967; 105, 1951; San Francisco 87, 1950; 90, 2015; SFO 94, 2019; 90, 2015; Redwood City 100, 2019; 101, 2015; Half Moon Bay 71, 1984; 72, 2015; Oakland Dtown 93, 2015; 92, 2015; San Jose 99, 2019; 97, 2015; Gilroy 104, 2019; 107, 2019; Santa Cruz 101, 2015; 94, 1983; Salinas 93, 2015; 94, 1933; Monterey 90, 2015; 83, 2015; King City 104, 1950; 103, 2015;
MARINE. as of 02:31 AM PDT Saturday . Winds are currently light, but locally stronger afternoon and evening winds are expected along coastal gaps, particularly near Santa Cruz and along the Big Sur Coast south of Point Sur. There is a small chance of scattered showers late on Saturday, mostly over the southern waters. Winds will increase slightly early next week as high pressure starts to build off the California coast. Mixed seas will prevail with a persistent small period northwest swell and a longer period southerly swell.
MTR WATCHES/WARNINGS/ADVISORIES. Tday. Excessive Heat Warning . CAZ507-510-511-513-516>518 Fire Weather Watch . CAZ516>518-528-530 Heat Advisory . CAZ006-506-508-512-528>530 SCA . Pigeon Pt to Pt Pinos 0-10 nm from 3 PM SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm from 3 PM
PUBLIC FORECAST: DRP AVIATION: DK MARINE: DK
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 mapWind History for Alameda, CA
(wind in knots) EDIT (on/off) Help| 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 | 6 AM | 7 AM | 8 AM | |
| Last 24hr | NW G5 | W | N | W | NW | W | W | W | W | W G11 | W | W | W | N | W | SW | N | NW G6 | NW | N | NW | N | N | N |
| 1 day ago | N G5 | W | W | W | W | NW G7 | W | W | NW | W | W | W | N G9 | W | NW | N G8 | S | -- | W | NW | N | W G5 | NW | N G6 |
| 2 days ago | W | W | SW | W | W | W | W G11 | W | W | W | W | W G11 | W | W G7 | NW | NW | W | NW | W | NE | N | -- | N | N |
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 |
| Hayward, Hayward Air Terminal, CA | 3 mi | 44 min | N 0 | 10.00 mi | Fair | 82°F | 53°F | 37% | 1013 hPa |
| Oakland, Metro Oakland International Airport, CA | 3 mi | 45 min | W 6 | 10.00 mi | A Few Clouds | 77°F | 57°F | 52% | 1012.5 hPa |
| San Carlos Airport, CA | 11 mi | 51 min | Var 4 | 10.00 mi | Clear | 73°F | 62°F | 69% | 1012.9 hPa |
| San Francisco, San Francisco International Airport, CA | 11 mi | 42 min | E 3 | 10.00 mi | A Few Clouds | 73°F | 61°F | 66% | 1012.3 hPa |
| Palo Alto Airport, CA | 14 mi | 51 min | N 0 | 10.00 mi | A Few Clouds | 75°F | 62°F | 65% | 1012.5 hPa |
| Mountain View, Moffett Field, CA | 18 mi | 2.7 hrs | N 0 | 10.00 mi | Fair | 72°F | 62°F | 73% | 1011.8 hPa |
| Livermore, Livermore Municipal Airport, CA | 19 mi | 45 min | WNW 3 | 10.00 mi | Fair | 82°F | 54°F | 38% | 1011.7 hPa |
| Half Moon Bay Airport, CA | 21 mi | 43 min | NW 6 | 7.00 mi | Fair | 70°F | 57°F | 64% | 1012.9 hPa |
| Concord, Buchanan Field, CA | 22 mi | 45 min | NNW 5 | 10.00 mi | Fair | 82°F | 55°F | 40% | 1010.3 hPa |
Link to 5 minute data for KOAK
Wind History from OAK (wind in knots)
| 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 | 6 AM | 7 AM | 8 AM | 9 AM | |
| Last 24hr | W | W | W | NW | NW | NW | NW | NW | NW | NW | NW | NW | W | NW | S | NW | NW | NW | N | NW | NW | N | NW | W |
| 1 day ago | W | SW | W | NW | NW | NW | NW | NW | NW | NW | N | W | NW | N | SW | Calm | NW | Calm | NE | SW | NW | Calm | Calm | |
| 2 days ago | NW | W | W | NW | NW | NW | NW | NW | W | NW | NW | NW | NW | NW | Calm | NW | Calm | N | N | Calm | Calm | N | NW | Calm |
Tide / Current Tables for Roberts Landing, 1.3 miles west of, San Francisco Bay, California
EDIT Weekend mode (on/off) (on/off) Help One Week of DataRoberts Landing
Click for Map
Sat -- 02:35 AM PDT Moonrise
Sat -- 05:07 AM PDT 0.24 feet Low Tide
Sat -- 06:24 AM PDT Sunrise
Sat -- 11:56 AM PDT 5.83 feet High Tide
Sat -- 04:43 PM PDT 3.26 feet Low Tide
Sat -- 05:49 PM PDT Moonset
Sat -- 08:00 PM PDT Sunset
Sat -- 10:09 PM PDT 7.57 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Sat -- 02:35 AM PDT Moonrise
Sat -- 05:07 AM PDT 0.24 feet Low Tide
Sat -- 06:24 AM PDT Sunrise
Sat -- 11:56 AM PDT 5.83 feet High Tide
Sat -- 04:43 PM PDT 3.26 feet Low Tide
Sat -- 05:49 PM PDT Moonset
Sat -- 08:00 PM PDT Sunset
Sat -- 10:09 PM PDT 7.57 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 |
| 5.5 | 4.1 | 2.6 | 1.4 | 0.6 | 0.2 | 0.5 | 1.2 | 2.3 | 3.6 | 4.7 | 5.6 | 5.8 | 5.5 | 4.8 | 4 | 3.4 | 3.3 | 3.8 | 4.8 | 6 | 7 | 7.6 | 7.4 |
Tide / Current Tables for Oakland Airport SW, South San Francisco Bay, California Current
EDIT (on/off) Help One Week of DataOakland Airport SW
Click for Map
Sat -- 12:36 AM PDT -0.77 knots Max Ebb
Sat -- 02:35 AM PDT Moonrise
Sat -- 04:40 AM PDT 0.01 knots Slack
Sat -- 06:25 AM PDT Sunrise
Sat -- 08:06 AM PDT 0.58 knots Max Flood
Sat -- 11:21 AM PDT -0.00 knots Slack
Sat -- 01:17 PM PDT -0.32 knots Max Ebb
Sat -- 04:23 PM PDT 0.00 knots Slack
Sat -- 05:49 PM PDT Moonset
Sat -- 07:27 PM PDT 0.43 knots Max Flood
Sat -- 08:00 PM PDT Sunset
Sat -- 10:15 PM PDT -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Sat -- 12:36 AM PDT -0.77 knots Max Ebb
Sat -- 02:35 AM PDT Moonrise
Sat -- 04:40 AM PDT 0.01 knots Slack
Sat -- 06:25 AM PDT Sunrise
Sat -- 08:06 AM PDT 0.58 knots Max Flood
Sat -- 11:21 AM PDT -0.00 knots Slack
Sat -- 01:17 PM PDT -0.32 knots Max Ebb
Sat -- 04:23 PM PDT 0.00 knots Slack
Sat -- 05:49 PM PDT Moonset
Sat -- 07:27 PM PDT 0.43 knots Max Flood
Sat -- 08:00 PM PDT Sunset
Sat -- 10:15 PM PDT -0.00 knots Slack
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 |
| -0.7 | -0.8 | -0.6 | -0.5 | -0.2 | 0.1 | 0.4 | 0.5 | 0.6 | 0.5 | 0.4 | 0.1 | -0.2 | -0.3 | -0.3 | -0.2 | -0.1 | 0.1 | 0.3 | 0.4 | 0.4 | 0.3 | 0.1 | -0.3 |
Weather Map
(on/off) Help Weather Map
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 (12,3,4,5)
(on/off) Help
Ground Weather Radar Station San Francisco Bay Area, CA
(on/off) Help
Ad by Google
|
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. If you are subject to CCPA, Google ads on this site will not be based on your past behavior so you will likely not see an ad for a lawn mower just because you looked for one at a big box website. I do not believe this site is subject to CCPA but I am doing what I can to follow the guidelines 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. |