Sunday, April18, 2021
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Marine Weather and Tides
Sereno del Mar, CA

Version 3.4
NOTICE
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 6:28AMSunset 7:52PM Sunday April 18, 2021 1:09 PM PDT (20:09 UTC) Moonrise 9:46AMMoonset 12:22AM Illumination 43% Phase: First Quarter Moon; Moon at 7 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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PZZ540 Coastal Waters From Point Arena To Point Reyes California Out To 10 Nm- 843 Am Pdt Sun Apr 18 2021
.small craft advisory in effect from 3 pm pdt this afternoon through Monday evening...
Today..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 5 to 6 ft. NW swell 2 to 3 ft at 12 seconds and sw around 2 ft at 16 seconds.
Tonight..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 6 to 7 ft. NW swell 2 to 3 ft at 11 seconds and sw around 2 ft at 15 seconds.
Mon..NW winds 20 to 30 kt with gusts up to 35 kt. Wind waves 7 to 8 ft. NW swell around 2 ft at 11 seconds and sw around 2 ft at 15 seconds.
Mon night..NW winds 20 to 30 kt with gusts up to 35 kt. Wind waves 9 to 10 ft. W swell around 2 ft at 12 seconds and sw around 2 ft at 15 seconds.
Tue..NW winds 25 to 30 kt with gusts up to 40 kt. Wind waves 8 to 9 ft. W swell 2 to 3 ft at 12 seconds.
Tue night..NW winds 15 to 25 kt with gusts up to 35 kt. Wind waves 9 to 10 ft. W swell 2 to 3 ft at 12 seconds.
Wed..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 6 to 7 ft. NW swell 3 to 5 ft.
Thu..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 6 to 7 ft. NW swell 3 to 5 ft.
PZZ500 843 Am Pdt Sun Apr 18 2021
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Expect winds to gradually increase this afternoon and evening. Winds will then pick up further on Monday as a disturbance moves down from the pacific northwest into northern california. NEar gale force gusts may be possible over the northern waters by Tuesday morning. Elevated winds will persist through mid week. These winds will produce steep wind waves creating hazardous seas conditions, particularly for smaller vessels. Moderate northwest swell through the period along with a lighter longer period southerly swell.


7 Day Forecast for Marine Location Near Sereno del Mar, CA
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location: 38.4, -123.09     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 181834 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1134 AM PDT Sun Apr 18 2021

SYNOPSIS. Temperatures will be well above normal today as ridging aloft continues. Slight cooling begins Monday, mainly in coastal areas. More widespread cooling is forecast for Tuesday as temperatures return to seasonal averages. Dry conditions persist through Friday with slight chances of rain next weekend.

DISCUSSION. as of 08:56 AM PDT Sunday . What a difference 24 hours makes. Building high pressure overhead and lingering offshore flow has resulted in a much more shallow marine layer this morning. In fact, profilers show the depth of the marine layer less than 1,000 feet. Despite the compression, low clouds did push inland into the Salinas Valley. Not only were the clouds lower, but the compressed marine layer resulted in locally dense fog. Fog has been reported along the immediate coast with visibilities at KSNS/KMRY/KWVI less than 1/2 mile. Inland clouds/fog will continue to erode back to the the immediate coastline this morning and this trend is already occuring at nearby airports. Clouds will likely linger along the coast through out the day keeping temperatures in check. Inland areas on the other hand will see ample sunshine leading to much warmer temperatures. For more details see below

PREV DISCUSSION. as of 03:56 AM PDT Sunday .

Today will feature clear skies and the warmest temperatures of the year for many locations, as the ridge expands over the state. Max temp's in the 80s will be felt in the north bay valleys, Santa Clara Valley, southern Salinas Valley, San Benito County, and inland East Bay. Spots around the SF Bay shoreline and elevated areas of Santa Cruz County may also reach the low 80s. The Pacific Coast will likely remain in the upper 50s to low to mid 70s, with cooling onshore breezes dominating in the afternoon. Still, a pleasant day for the coast, with warmer temp's not seen in recent weeks.

This warm spell will be short-lived however, as the coastal ridge begins to break down on Monday. Coastal areas will experience significant cooling during the day, with a building marine layer and more cloud cover. Further inland, it will be another warm day, with marine air having less of an influence, and 850 mb temps peaking, but still a few degrees of cooling can be expected. Thus low to mid 80s will persist in inland valleys, with upper 60s and 70s around the SF Bay shoreline and upper 50s and 60s along the Pacific coastline.

By Tuesday, the ridge moves well offshore, and an upper level disturbance moves over the NE part of the state, reaching the Great Basin early Wednesday. This will bring precip chances to the Sierra but nothing to our area, except cooler temp's, more clouds and breezier winds. Though cooler, temp's will be near normal. Wednesday will be another seasonable day, with slight warming forecast for the end of the week.

Things begin to get interesting towards Sunday when and upper low from the Gulf of Alaska approaches the PAC NW. Latest deterministic GFS run shows the low bringing light precip to NorCal early sunday into Monday. Euro run shows a trough axis pivoting over the west coast, bringing light to moderate rain to much of central and southern CA monday into Tuesday. More than half of the Euro ensemble members show QPF in this time frame, while the GEFS is closer to 25 percent. Still far out, but hopefully this isn't just another tease.

AVIATION. As of 11:30 AM PDT Sunday . For the 18Z TAFs. VFR at most all sites. The marine layer is hugging the coast, but will start to mix out as stronger winds build in over the waters this afternoon. Onshore winds will be lighter for the inland terminals, and mildly breezy for the coastal terminals this afternoon with more moderate winds at KSFO around 00Z. Skies will be SKC-FEW250 this afternoon and evening. The marine layer will return tonight around 08-10Z. KMRY/KSNS will see SCT008 start to advect inland around 03Z, reaching MVFR/IFR conditions around 08Z. Higher confidence in most sites returning to VFR by 17Z Monday.

Vicinity of KSFO . VFR with some low clouds along the coast west of the airport. Onshore winds will increase this afternoon to around 15-20 kt. Models and guidance show the potential for low clouds to move further inland late tonight, brining MVFR conditions from 10-16Z Monday morning. Winds will become more breezy Monday afternoon, with higher chances of G20-25kts.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR conditions prevailing through this evening. Low clouds returning tonight will give MVFR/IFR conditions to KMRY/KSNS from 08-16Z. Lower chance for vis drops <1SM or +FG like was seen this morning. Light winds this morning increasing and turning onshore this afternoon. Onshore winds will become breezy Monday afternoon.

MARINE. as of 10:47 AM PDT Sunday . Expect winds to gradually increase this afternoon and evening. Winds will then pick up further on Monday as a disturbance moves down from the Pacific Northwest into northern California. Near gale force gusts may be possible over the northern waters by Tuesday morning. Elevated winds will persist through mid week. These winds will produce steep wind waves creating hazardous seas conditions, particularly for smaller vessels. Moderate northwest swell through the period along with a lighter longer period southerly swell.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pigeon Pt to Pt Pinos 0-10 nm from 3 PM SCA . Pt Arena to Pt Reyes 0-10 nm from 3 PM SCA . Pt Arena to Pigeon Pt 10-60 nm from 3 PM



PUBLIC FORECAST: MM/Lorber AVIATION: Dhuyvetter MARINE: Dhuyvetter

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BDXC1 6 mi63 min 50°F
PRYC1 - 9415020 - Point Reyes, CA 29 mi51 min 47°F1021.6 hPa
46214 - Point Reyes, CA (029) 38 mi43 min 49°F7 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 47 mi29 min NW 14 G 18 50°F1021.8 hPa
ANVC1 - 9416841 - Arena Cove, CA 48 mi51 min WNW 6 G 9.9 49°F 1021.9 hPa
46237 - San Francisco Bar, CA (142) 49 mi129 min 54°F5 ft
RCMC1 - 9414863 - Richmond, CA 49 mi57 min S 4.1 G 5.1 60°F 58°F1020 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 49 mi58 min SE 2.9 64°F 1020 hPa

Wind History for Point Reyes, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Santa Rosa, Santa Rosa Sonoma County Airport, CA17 mi76 minN 010.00 miFair81°F40°F23%1018.8 hPa

Link to 5 minute data for KSTS

Wind History from STS (wind in knots)
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Last 24hrSE8S76SW12SW4SE8SE6S5SE4CalmCalmCalmCalmW3CalmCalmW3NW4W3N4N3NW5CalmCalm
1 day agoS10SE13SE12SE12SE11SE10SE6S4SE3SE3S3CalmCalmSE3CalmSE3CalmCalmCalmW3SW4S55SE6
2 days agoS9S11S8S10S9S7SE8SE6S5SE5SE3CalmW3CalmCalmCalm--SW3--------S6S7

Tide / Current Tables for Bodega Harbor entrance, California
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Bodega Harbor entrance
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Sun -- 01:21 AM PDT     Moonset
Sun -- 02:52 AM PDT     4.75 feet High Tide
Sun -- 06:31 AM PDT     Sunrise
Sun -- 10:26 AM PDT     0.27 feet Low Tide
Sun -- 10:45 AM PDT     Moonrise
Sun -- 06:19 PM PDT     3.72 feet High Tide
Sun -- 07:51 PM PDT     Sunset
Sun -- 10:36 PM PDT     3.53 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.94.34.64.74.543.22.21.30.60.30.30.71.21.92.53.13.53.73.73.73.63.53.5

Tide / Current Tables for Salt Point, California Current
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Salt Point
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Sun -- 01:24 AM PDT     Moonset
Sun -- 01:34 AM PDT     0.36 knots Max Flood
Sun -- 03:54 AM PDT     -0.00 knots Slack
Sun -- 06:32 AM PDT     Sunrise
Sun -- 07:52 AM PDT     -0.99 knots Max Ebb
Sun -- 10:45 AM PDT     Moonrise
Sun -- 12:00 PM PDT     0.00 knots Slack
Sun -- 03:05 PM PDT     0.66 knots Max Flood
Sun -- 06:50 PM PDT     -0.00 knots Slack
Sun -- 07:53 PM PDT     Sunset
Sun -- 08:39 PM PDT     -0.34 knots Max Ebb
Sun -- 11:54 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.30.30.2-0-0.3-0.6-0.9-1-0.8-0.6-0.3-00.30.60.70.60.50.3-0-0.3-0.3-0.2-0.1

Weather Map
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GEOS Local Image of CentralWestCoast    EDIT
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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