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Marine Weather and Tides
Version 3.4 |
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 7:13AM | Sunset 5:15PM | Wednesday January 20, 2021 2:03 PM PST (22:03 UTC) | Moonrise 11:36AM | Moonset 12:00AM | Illumination 50% | ![]() |
PZZ531 San Francisco Bay South Of The Bay Bridge- 839 Am Pst Wed Jan 20 2021
Today..SE winds up to 10 kt, becoming nw this afternoon.
Tonight..NW winds up to 10 kt.
Thu..S winds up to 10 kt.
Thu night..SW winds 5 to 10 kt. A slight chance of showers.
Fri..NW winds 5 to 15 kt with gusts up to 25 kt. A slight chance of showers.
Fri night..N winds 5 to 15 kt.
Sat..NW winds up to 10 kt.
Sun..W winds 5 to 15 kt. Showers likely.
Today..SE winds up to 10 kt, becoming nw this afternoon.
Tonight..NW winds up to 10 kt.
Thu..S winds up to 10 kt.
Thu night..SW winds 5 to 10 kt. A slight chance of showers.
Fri..NW winds 5 to 15 kt with gusts up to 25 kt. A slight chance of showers.
Fri night..N winds 5 to 15 kt.
Sat..NW winds up to 10 kt.
Sun..W winds 5 to 15 kt. Showers likely.
PZZ500 839 Am Pst Wed Jan 20 2021
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure will continue dry weather today and tonight over northern california. A cold front arrives Thursday night into Friday with gusty northwest winds and a slight chance of showers. A colder, unstable northwest pattern will bring an upper level low to the coastal waters and bays Sunday with another round of showers and gusty northwest winds.
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure will continue dry weather today and tonight over northern california. A cold front arrives Thursday night into Friday with gusty northwest winds and a slight chance of showers. A colder, unstable northwest pattern will bring an upper level low to the coastal waters and bays Sunday with another round of showers and gusty northwest winds.
7 Day Forecast for Marine Location Near Oakdale, CA
Hourly EDIT Help
location: 37.76, -120.84 debug
Area Discussion for - Sacramento, CA
  (on/off)  Help NOTE: mouseover dotted underlined text for definitionFXUS66 KSTO 201130 AFDSTO
Area Forecast Discussion National Weather Service Sacramento CA 330 AM PST Wed Jan 20 2021
SYNOPSIS. Dry weather will Less windy conditions expected today and Thursday, then rain and snow chances return for the end of the week into next week.
DISCUSSION. Clear skies and cooler temperatures are present across the region early this morning. Winds are much lighter than 24 hours ago as surface pressure gradients have relaxed and stronger winds aloft have decreased, but some areas with gusts in the 20s and 30s mph remain over the foothills and higher elevations.
Dry weather will continue today and Thursday with lighter winds. Highs will be a little cooler in the valley, but milder across higher terrain as cold advection wanes. Generally clear skies will allow for a better chance for valley frost tonight as dew points recover.
Over the course of the rest of the week, max temperatures will gradually cool through the 60s in the Valley, with temps returning to near normal by Fri with highs in the 50s in the Valley, 30s to 40s in the foothills and mtns. Min temps will cool into the 30s in the Valley, and teens and 20s in the mtns for the rest of the week.
Although there are model timing/detail issues later in the week, we are reasonably certain in the chances of rain/mountain snow on Fri in Norcal. There is enough model agreement that a seasonably cold upper trof will move into Norcal on Fri giving the CWA a chance of precip. The heaviest amounts are forecast over the Sierra (liquid amounts up to a half inch or so, and 3-6 inches or so of snow), but only a few hundredths to a tenth of an inch in the Valley. The system may linger into Sat, especially over the Sierra, but the Valley is likely to clear from N to S as the system drops Swd during the day. However, model differences create some uncertainty as to the exact timing, i.e. afternoon or evening. May see a thunderstorm or two late Friday over the southeast corner of the forecast area as daytime heating coincides with the upper trough passage.
EXTENDED DISCUSSION (Sunday THROUGH Wednesday). Long wave trough sets up along the West Coast allowing short wave troughs to drop into it resulting in unsettled weather through the extended forecast period. Below normal temperatures expected with snow levels in the foothills.
AVIATION. VFR conds ovr intr NorCal nxt 24 hrs. Sfc wnd genly blo 12 kts exc lcl NEly sfc wnd gsts up to 35 kts poss in ern fthls til 18z.
STO WATCHES/WARNINGS/ADVISORIES. None.
Weather Reporting Stations
EDIT (on/off)  Help NOTE: Click on distance to see the station location on a mapStations | Dist | Age | Wind | Air Temp | Water Temp | Waves | Pressure | DewPt |
PCOC1 - 9415144 - Port Chicago, CA | 67 mi | 45 min | NE 2.9 G 4.1 | 62°F | 52°F | 1018.8 hPa | ||
SFXC1 - San Francisco Bay Reserve, CA | 70 mi | 78 min | SSW 4.1 | 65°F | 1020 hPa | 22°F | ||
RTYC1 - 9414523 - Redwood City, CA | 75 mi | 45 min | NW 1.9 G 1.9 | 64°F | 55°F | 1019.3 hPa |
Wind History for Port Chicago, CA
(wind in knots) EDIT (on/off)  Help2 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 | 10 AM | 11 AM | 12 PM | 1 PM | |
Last 24hr | N | N G25 | N | N | N G16 | N | N G16 | NE | E | E | SW | S | SW | S | W | SW | SW | SW | S | SW | S | NE | NE | NE |
1 day ago | N G17 | NW | N G17 | N | NW G7 | N G22 | N G27 | N G29 | N | N | N G29 | N | N G29 | N G38 | N G33 | N | N | N G34 | N G34 | N G33 | N G32 | N G32 | N G34 | N G32 |
2 days ago | W | NW | W | NW | NE | SW G4 | SW | SW | S | S G6 | SW | E | NE | E | E | E G12 | N | SW | NE G16 | N G22 | N | N G23 | N G9 | N G26 |
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 |
Modesto City-County Airport - Harry Sham Field, CA | 11 mi | 70 min | NW 7 | 10.00 mi | Fair | 62°F | 23°F | 22% | 1018.6 hPa |
Stockton, Stockton Metropolitan Airport, CA | 24 mi | 68 min | NW 6 | 10.00 mi | Fair | 64°F | 28°F | 26% | 1018.9 hPa |
Link to 5 minute data for KMOD
Wind History from MOD (wind in knots)
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 | 10 AM | 11 AM | 12 PM | 1 PM | 2 PM | |
Last 24hr | Calm | Calm | NW G20 | W | NW | W | W | W | NW | NW | NW | NW | NW | NW | NW | SE | Calm | Calm | NW | NW | NW | NW | NW | |
1 day ago | NW G25 | NW | NW | NW | W | W | NW | NW | NW | N G19 | N G21 | N G22 | N | N G25 | N G25 | N | N G28 | N G22 | N G24 | N G25 | N G19 | N | E | |
2 days ago | Calm | Calm | NW | Calm | Calm | Calm | Calm | Calm | SE | SE | E | E | Calm | Calm | Calm | NW | NW | NW | NW | NW G23 | NW | N | NW G23 | NW G24 |
Tide / Current Tables for Grant Line Canal (drawbridge), Old River, California
EDIT Weekend mode (on/off) (on/off)  Help One Week of DataGrant Line Canal (drawbridge)
Click for Map
Wed -- 12:00 AM PST Moonset
Wed -- 01:01 AM PST 2.57 feet High Tide
Wed -- 07:05 AM PST 0.56 feet Low Tide
Wed -- 07:17 AM PST Sunrise
Wed -- 11:38 AM PST Moonrise
Wed -- 01:03 PM PST First Quarter
Wed -- 01:51 PM PST 3.34 feet High Tide
Wed -- 05:16 PM PST Sunset
Wed -- 08:48 PM PST 0.79 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Wed -- 12:00 AM PST Moonset
Wed -- 01:01 AM PST 2.57 feet High Tide
Wed -- 07:05 AM PST 0.56 feet Low Tide
Wed -- 07:17 AM PST Sunrise
Wed -- 11:38 AM PST Moonrise
Wed -- 01:03 PM PST First Quarter
Wed -- 01:51 PM PST 3.34 feet High Tide
Wed -- 05:16 PM PST Sunset
Wed -- 08:48 PM PST 0.79 feet Low 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 |
2.5 | 2.6 | 2.5 | 2.1 | 1.6 | 1.1 | 0.7 | 0.6 | 0.7 | 1.1 | 1.7 | 2.4 | 2.9 | 3.2 | 3.3 | 3.2 | 2.7 | 2.1 | 1.6 | 1.2 | 0.9 | 0.8 | 1 | 1.4 |
Tide / Current Tables for Brandt Bridge, San Joaquin River, California Current
EDIT (on/off)  Help One Week of DataBrandt Bridge
Click for Map
Wed -- 12:59 AM PST -0.00 knots Slack
Wed -- 04:41 AM PST -0.82 knots Max Ebb
Wed -- 07:17 AM PST Sunrise
Wed -- 08:11 AM PST 0.00 knots Slack
Wed -- 11:03 AM PST 0.66 knots Max Flood
Wed -- 11:37 AM PST Moonrise
Wed -- 01:03 PM PST First Quarter
Wed -- 02:03 PM PST -0.00 knots Slack
Wed -- 05:15 PM PST Sunset
Wed -- 06:03 PM PST -0.83 knots Max Ebb
Wed -- 09:44 PM PST 0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Wed -- 12:59 AM PST -0.00 knots Slack
Wed -- 04:41 AM PST -0.82 knots Max Ebb
Wed -- 07:17 AM PST Sunrise
Wed -- 08:11 AM PST 0.00 knots Slack
Wed -- 11:03 AM PST 0.66 knots Max Flood
Wed -- 11:37 AM PST Moonrise
Wed -- 01:03 PM PST First Quarter
Wed -- 02:03 PM PST -0.00 knots Slack
Wed -- 05:15 PM PST Sunset
Wed -- 06:03 PM PST -0.83 knots Max Ebb
Wed -- 09:44 PM PST 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 |
0.3 | -0 | -0.3 | -0.6 | -0.8 | -0.8 | -0.7 | -0.5 | -0.1 | 0.3 | 0.6 | 0.7 | 0.6 | 0.4 | 0 | -0.3 | -0.6 | -0.8 | -0.8 | -0.8 | -0.6 | -0.2 | 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
Ground Weather Radar Station
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