Thursday, October21, 2021
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Marine Weather and Tides
Belmont, CA

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 7:22AMSunset 6:25PM Thursday October 21, 2021 3:03 PM PDT (22:03 UTC) Moonrise 6:12PMMoonset 7:20AM Illumination 99% Phase: Waning Gibbous; Moon at 16 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
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PZZ531 San Francisco Bay South Of The Bay Bridge- 310 Am Pdt Thu Oct 21 2021
Today..SE winds 5 to 10 kt, becoming sw 10 to 15 kt with gusts up to 25 kt this afternoon. Rain likely, mainly this morning.
Tonight..S winds 15 to 20 kt with gusts up to 25 kt. Rain.
Fri..W winds 10 to 15 kt with gusts up to 25 kt. Rain.
Fri night..W winds around 5 kt.
Sat..S winds 5 to 10 kt. Rain likely.
Sat night..SE winds 10 to 20 kt with gusts up to 25 kt. Rain.
Sun..S winds 10 to 20 kt with gusts up to 30 kt. Rain.
Mon..SW winds 10 to 15 kt. Rain.
PZZ500 310 Am Pdt Thu Oct 21 2021
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Gusty winds continuing in the northernmost outer waters today and tonight. Moderate rainfall returns as a secondary weaker boundary moves over the waters late tonight into Friday morning. Winds are forecast to turn to the west and weaken in the wake of the front Friday. More impactful marine weather arrives with a strong atmospheric river late in the weekend into early next week. Gale force southerly winds, very steep waves, and large swell are possible Sunday into Monday.


7 Day Forecast for Marine Location Near Belmont, CA
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location: 37.52, -122.28     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 212056 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 156 PM PDT Thu Oct 21 2021

SYNOPSIS.

A frontal system will bring additional rain chances to the area late tonight into Friday. Drying conditions are expected for Friday night into Saturday morning. An atmospheric river will then take aim on the region Sunday into Monday bringing gusty winds, hazardous beach and marine conditions, and potentially significant rainfall.

DISCUSSION. as of 01:55 PM PDT Thursday .

Tonight through Friday:

A frontal zone -- attendant to occluding low pressure over the northeast Pacific -- will move through our area. Large-scale lift should be maximized during this time given increasing jet-level divergence and cyclonic vorticity advection with the upper wave. This will combine with low-level frontal forcing and a seasonally respectable moisture plume to produce brief moderate rainfall as the front passes through from northwest to southeast. Can't rule out a rumble of thunder either over the northern waters and/or adjacent North Bay given some modest instability. Otherwise beneficial rainfall is the main story for this event, with additional rain amounts ranging from 1-3" for the North Bay Mountains, ~1" in the Santa Cruz Mountains, to ~0.2" to 0.75" in the valleys. The primary window for precipitation should begin late tonight for the North Bay, shifting towards the Monterey Bay region during the early to mid morning hours on Friday. Precipitation should be ending for all areas by early Friday afternoon as the front passes and the atmospheric column dries. Given strong winds aloft gusts to 30+ mph are possible along and ahead of the frontal passage particularly for the higher elevations.

Saturday through Monday:

A strong low pressure system should develop over the Gulf of Alaska before advancing towards British Columbia and the Pacific Northwest by early next week. A deep plume of moisture should advect into the region by Sunday as the first Atmospheric River of the season takes aim on our area. Integrated water Vapor Transport (IVT) values are notable, and may exceed 750 m-1 s-1, suggesting the possibility for a moderate to strong event. The moisture is notably rich as precipitable water values climb to ~1.75 off the Central Coast by Sunday. While the IVT values are impressive a few caveats worth noting are 1) the associated system appears fairly progressive while moving through our area; and 2) the control runs for the IVT forecast are a bit higher than their ensemble means. That said, confidence for a widespread moderate to locally heavy rainfall event is increasing for Sunday into Monday. Details this far out remain a bit murky, but in general rain amounts of 4-6" inches are forecast for the coastal ranges (isolated higher totals are possible) with 1-3" elsewhere. Rain shadowing may reduce these totals somewhat in the Santa Clara and Salinas valleys. It's also important to note that adjustments in rain amounts (up or down) are possible as the forecast details become clearer. Keep up with forecast changes and make sure you have the most current information. With rain on the way now's a good time to take proactive measures like clearing gutters and storm drains of debris. Gusty southerly winds should also accompany this system creating hazardous marine and beach conditions while making travel potentially difficult for high profile vehicles.

Tuesday through Thursday:

Residual troughing should persist through mid-week resulting in possible periods of light rainfall. Chances may diminish somewhat by late week as upper heights briefly build ahead of the next system advancing towards the Pacific Northwest.

AVIATION. as of 10:55 AM PDT Thursday . For the 18z TAFs. An active, unsettled pattern will bring suboptimal aviation weather through the TAF period and through at least Monday, however, there should be a couple of fair VFR conditions between the weather systems.

The first of these will occur through the remainder of the daylight hours today, primarily from the Golden Gate southward. The second of these will occur in the wake of tonight's cold frontal passage, so through day tomorrow and into early Saturday. In the near term, IFR-MVFR conditions will prevail across the North Bay as a pair of boundaries merge there over the next 12 to 18 hours. VFR conditions are expected elsewhere from roughly midday through this evening, before deteriorating conditions due to an approaching cold front lowers cigs/visbys overnight and into Friday morning. Moderate to heavy rain is possible with the next frontal passage (eyeing 09Z FRI in North Bay to 14-16Z FRI in South Bay/Central Coast) along with a wind shift towards the SW-W in the wake of the front. Winds generally south/southeast and light to locally breezy, becoming light west later tomorrow. LLWS of 40 KTS at 2000 feet is also concern ahead and along the front overnight in the North Bay (see TAF). A period of VFR conditions is expected at the tail end of the TAF period, however, a strong atmospheric river will bring very poor aviation weather from Sunday into Monday.

Vicinity of KSFO . SE/S winds to 11 KTS today, increasing slightly and becoming gusty overnight, then becoming SW to W through mid to late tomorrow morning. Light rain possible through the day, but mostly finished with precipitation until tonight's cold front passes through between 09-15Z FRI. With this front, expect briefly moderate rain, lowering visibility, wet runways, IFR/MVFR cigs, and a wind shift towards the SW in the wake of the front. VFR conditions in the wake of late tonight to tomorrow morning's frontal passage before the next (and strongest) system begins to impact the area Sunday into Monday.

KSFO Bridge Approach . Similar to KSFO.

Monterey Bay . VFR currently but MVFR CIGs to return ahead of incoming cold front this evening. VCSH early Friday morning with rain coming in ahead of cold front, then light rain proceeding it later in the morning. Brief IFR conditions possible Friday morning with the environment being moist which can lower visibilities with mist and light rain. Moderate winds through TAF period but could be gustier before and during frontal passage.

MARINE. as of 10:43 AM PDT Thursday . Gusty southerly winds continue in the northernmost outer waters today and tonight. Moderate rainfall returns as a secondary weaker boundary moves over the waters late tonight into Friday morning. Winds are forecast to turn to the west and weaken in the wake of the front Friday. More impactful marine weather arrives with a strong atmospheric river late in the weekend into early next week. Gale force southerly winds, very steep waves, and large swell are possible Sunday into Monday.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. SCA . Pt Reyes to Pigeon Pt 0-10 nm from 3 AM SCA . Pigeon Pt to Pt Pinos 0-10 nm from 3 AM SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm from 3 AM SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pt Arena to Pt Reyes 0-10 nm SCA . SF Bay from 9 PM until 3 AM



PUBLIC FORECAST: SPM AVIATION: DRP MARINE: DRP

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 4 mi45 min SSW 7G11 72°F 1018.8 hPa
AAMC1 - 9414750 - Alameda, CA 17 mi45 min SW 8G9.9 65°F 61°F1018.9 hPa
LNDC1 19 mi45 min SW 6G9.9 67°F 1018.5 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 20 mi45 min SSW 11G14
PXOC1 - 9414311 - San Francisco (Pier 1), CA 20 mi45 min SE 5.1G8.9 67°F 1017.5 hPa
OBXC1 20 mi45 min 65°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 20 mi45 min SSW 7G11 66°F 1018.5 hPa
PXSC1 21 mi45 min 68°F 68°F
FTPC1 - 9414290 - San Francisco, CA 22 mi45 min S 6G11 64°F 68°F1018.7 hPa
46237 - San Francisco Bar, CA (142) 26 mi63 min 57°F 55°F7 ft
PPXC1 - 9414847 - Richmond (Point Potrero), CA 27 mi45 min SSW 8G12 65°F 1018.8 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 27 mi82 min SSE 8 63°F 1019 hPa
RCMC1 - 9414863 - Richmond, CA 29 mi45 min S 7G9.9 63°F 60°F1018.7 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 34 mi33 min S 14G16 56°F1018.8 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 34 mi33 min SSE 12G18 58°F 1018.9 hPa58°F
MZXC1 - 9415102 - Martinez-Amorco CA 37 mi45 min W 5.1G5.1 63°F 62°F1018.5 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 37 mi45 min W 5.1G6 64°F 1018.2 hPa
PCOC1 - 9415144 - Port Chicago, CA 39 mi45 min NW 5.1G6 64°F 63°F1018.3 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 42 mi45 min N 1.9G2.9 67°F 1017.9 hPa
46269 43 mi93 min 59°F 58°F6 ft
PRYC1 - 9415020 - Point Reyes, CA 49 mi45 min 56°F1018.2 hPa
SFXC1 - San Francisco Bay Reserve, CA 49 mi78 min W 2.9 67°F 1023 hPa63°F

Wind History for Redwood City, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Carlos Airport, CA2 mi76 minS 710.00 miMostly Cloudy72°F63°F73%1018.6 hPa
San Francisco, San Francisco International Airport, CA8 mi67 minSSW 810.00 miMostly Cloudy69°F61°F76%1018.3 hPa
Palo Alto Airport, CA9 mi16 minVar 510.00 miMostly Cloudy73°F61°F65%1017.9 hPa
Half Moon Bay Airport, CA12 mi68 minS 16 G 210.75 miFog/Mist61°F61°F100%1019.3 hPa
Hayward, Hayward Air Terminal, CA13 mi69 minWSW 710.00 miMostly Cloudy72°F60°F66%1018.9 hPa
Oakland, Metro Oakland International Airport, CA13 mi70 minWSW 710.00 miMostly Cloudy69°F61°F76%1018.6 hPa
Mountain View, Moffett Field, CA14 mi73 minSSE 9 G 1410.00 miFair73°F59°F61%1017.9 hPa
San Jose, San Jose International Airport, CA21 mi70 minSSW 1210.00 miMostly Cloudy74°F59°F60%1017.8 hPa

Link to 5 minute data for KSQL

Wind History from SQL (wind in knots)
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Last 24hrSE10--E40E50000SE30E600SE4SE30000SE12SE10S7SW7
1 day ago--S9S14
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S9S6SE7S73S7SW7SE4S11S12
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2 days agoW10SW9SW9W7W7NW6000000000000000N4NE6NW7

Tide / Current Tables for Smith Slough, San Francisco Bay, California
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Smith Slough
Click for Map
Thu -- 02:10 AM PDT     7.05 feet High Tide
Thu -- 07:23 AM PDT     Sunrise
Thu -- 08:06 AM PDT     1.79 feet Low Tide
Thu -- 08:19 AM PDT     Moonset
Thu -- 01:41 PM PDT     7.89 feet High Tide
Thu -- 06:23 PM PDT     Sunset
Thu -- 07:11 PM PDT     Moonrise
Thu -- 08:49 PM PDT     0.16 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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Tide / Current Tables for San Mateo Bridge, South San Francisco Bay, California Current
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San Mateo Bridge
Click for Map
Thu -- 02:43 AM PDT     -0.01 knots Slack
Thu -- 05:35 AM PDT     -1.17 knots Max Ebb
Thu -- 07:23 AM PDT     Sunrise
Thu -- 08:20 AM PDT     Moonset
Thu -- 08:35 AM PDT     0.01 knots Slack
Thu -- 11:11 AM PDT     1.40 knots Max Flood
Thu -- 02:21 PM PDT     -0.00 knots Slack
Thu -- 05:45 PM PDT     -1.69 knots Max Ebb
Thu -- 06:23 PM PDT     Sunset
Thu -- 07:11 PM PDT     Moonrise
Thu -- 09:06 PM PDT     0.00 knots Slack
Thu -- 11:55 PM PDT     1.71 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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Weather Map
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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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