Thursday, August6, 2020
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Marine Weather and Tides
Bonny Doon, CA

Version 3.4
NOTICE
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 6:16AMSunset 8:10PM Thursday August 6, 2020 5:48 PM PDT (00:48 UTC) Moonrise 9:17PMMoonset 8:07AM Illumination 91% Phase: Waning Gibbous; Moon at 18 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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PZZ560 Coastal Waters From Pigeon Point To Point Pinos California Out To 10 Nm- 201 Pm Pdt Thu Aug 6 2020
.small craft advisory in effect through late tonight...
Rest of today..NW winds 15 to 25 kt with gusts up to 35 kt. Wind waves 3 to 4 ft. NW swell 4 to 6 ft at 8 seconds.
Tonight..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. NW swell 4 to 6 ft at 8 seconds.
Fri..W winds 5 to 15 kt. Wind waves 1 ft. NW swell 5 to 6 ft at 10 seconds.
Fri night..SW winds up to 10 kt. Wind waves 1 ft. NW swell 5 to 7 ft at 10 seconds.
Sat..S winds 5 to 10 kt. Wind waves 1 to 2 ft. NW swell 5 to 7 ft at 10 seconds.
Sat night..S winds around 5 kt. Wind waves 1 ft. NW swell 5 to 6 ft at 10 seconds.
Sun..S winds up to 10 kt. Wind waves 1 ft. NW swell 4 to 6 ft.
Mon..SW winds up to 10 kt. Wind waves 1 ft. NW swell 4 to 6 ft.
PZZ500 201 Pm Pdt Thu Aug 6 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate to locally breezy northwest winds will persist tonight across the waters. Gusty afternoon and evening winds are expected today over the san francisco bays. These winds will generate steep fresh swell resulting in hazardous seas conditions for smaller vessels. Winds will ease along the coast and over the southern waters tomorrow. They will also gradually turn southerly across the inner coastal waters tomorrow and Saturday. Locally stronger winds will persist over the northern outer waters into the weekend. Light southerly swells will continue into the weekend.


7 Day Forecast for Marine Location Near Bonny Doon, CA
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location: 37, -122.12     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 070018 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 518 PM PDT Thu Aug 6 2020

SYNOPSIS. Increased clearing this afternoon will allow some warming relative to yesterday though below normal temperatures continue this afternoon. A warming trend is expected from Friday through the weekend. Little intraday change near the coast aside from in the marine layer.

DISCUSSION. as of 02:00 PM PDT Thursday . A poorly defined 582-583dm low pressure system is directly over the Bay Area and Central coast early this afternoon. This system is flanked by equidistant 595dm H5 high pressure ridges, one to the SE over Texas, the other to the NW in the ENE Pacific. This feature is the weakest of the 3 and behaving moreso as an extension of a deeper trough aligned along the Pacific coast from Anchorage Alaska southward to Baja California. The Ford Ord and Bodega Bay profilers showed the marine layer deepening to roughly 3500 feet this morning. This is roughly the maximum depth before the cap of the marine layer is broken by cool air advection aloft eroding the vertical temperature gradient and an increase in turbulence aloft at these altitudes. Consequently, visible satellite imagery shows rapid clearing of the marine layer along and just behind the weak surface frontal boundary moving SSE from the northwest as cold air advection, dry air entrainment, and increased turbulence erode the marine layer. As such, increased insolation this afternoon from the clearing post frontal skies has contributed to warmer temperatures inland despite the cooler air aloft, with 1PM temperatures roughly 6-12 degrees warmer this time yesterday north of the Santa Cruz mountains. Areas south of the Santa Cruz mountains are inversely (paradoxically?) running 3 to 8 degrees cooler in response to the cold front/cloud clearing not yet reaching that region. All that said, temperatures overall are 2 to 10 degrees below normal for this time of the year -- not a big surprise with a trough overhead.

For tonight, this is still a summer night along the Bay Area and Central Coast, so expect to see some fledgling reformation of the marine layer from the remnant moisture of the last marine layer along the immediate coastline and just inland. Short term models suggest the lingering trough overhead may also once again perturb the marine layer and bring drizzle alongshore, however, the best chance for that was last night into this morning.

Looking ahead, the parent trough feeding the weaker low over our region will continue to push downstream and into central Canada. The weaker low over our region will then remain quasistationary over the next several days as the flanking ridges keep it in place. High pressure will gradually expand and advect in warmer and drier air to the region between today and the weekend, bringing a slight to locally moderate warming trend for the inland to extreme inland locations. Nearshore areas will see little day over day change through the next several.

AVIATION. As of 5:15 PM PDT Thursday . for 00z TAFs. VFR conditions to prevail through early evening north of the Monterey Bay region. 00Z satellite imagery shows clearing from north to south along the coast north of San Francisco, which should delay inland development of MVFR ceilings in the SF Bay Area until 04-05Z at the earliest. Monterey taf sites will likely see MVFR ceilings by 02-03Z. Locally breezy early evening onshore winds will subside by late evening.

Vicinity of KSFO . VFR conditions through early evening with MVFR ceilings expected to develop by 04-05Z. Breezy W/NW winds this evening of 15 to 20 kt with gusts 25 to 30 kt expected. Clearing expected by 17Z Friday.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . MVFR cigs likely to redevelop by 02-03Z, with IFR conditions late tonight into early Friday. VFR conditions will be slow to develop on Friday, especially at KMRY. Onshore winds 10-15 kt early this evening, then decreasing.

MARINE. as of 02:00 PM PDT Thursday . Moderate to locally breezy northwest winds will persist tonight across the waters. Gusty afternoon and evening winds are expected today over the San Francisco Bays. These winds will generate steep fresh swell resulting in hazardous seas conditions for smaller vessels. Winds will ease along the coast and over the southern waters tomorrow. They will also gradually turn southerly across the inner coastal waters tomorrow and Saturday. Locally stronger winds will persist over the northern outer waters into the weekend. Light southerly swells will continue into the weekend.

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



PUBLIC FORECAST: DRP AVIATION: Dykema MARINE: AS

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46092 - MBM1 18 mi39 min WNW 7.8 59°F 58°F1013.8 hPa (-0.6)
46042 - MONTEREY - 27NM West of Monterey Bay, CA 21 mi28 min NW 14 G 18 58°F 56°F1014.3 hPa57°F
MLSC1 - Moss Landing, South Harbor, CA 22 mi43 min WSW 5.1 G 13 60°F 1013.7 hPa55°F
46114 - West Monterey Bay, CA 24 mi22 min 58°F5 ft
ELXC1 - Elkhorn Slough Reserve, CA 24 mi63 min WNW 6 65°F 58°F
46240 - Cabrillo Point, Monterey Bay, CA (158) 28 mi52 min 57°F2 ft
MEYC1 30 mi72 min W 8.9 G 11 62°F 58°F1014.1 hPa
RTYC1 - 9414523 - Redwood City, CA 35 mi54 min W 14 G 17 70°F 73°F1013.2 hPa
46239 - Point Sur, CA (157) 45 mi52 min 58°F5 ft
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 47 mi28 min NW 12 G 16 59°F 1014.6 hPa57°F

Wind History for Monterey, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Watsonville, Watsonville Municipal Airport, CA18 mi55 minSW 810.00 miFair0°F0°F%1013.5 hPa

Link to 5 minute data for KWVI

Wind History from WVI (wind in knots)
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W7W8NW4CalmCalmW8W5SW4SW5SW4SW4S43CalmSW6S54Calm5SW6W7SW8
1 day agoE8E8E6E5E5CalmCalmCalmCalmCalmCalmCalmCalmNE3CalmCalmSW7SW7SW9SW8W11W13W15W13
2 days agoS7S8SE6SE4SE5E6E5E5NE4CalmCalm3E3E3CalmCalmS3SW5SW76SW7S9S6SE8

Tide / Current Tables for Santa Cruz, Monterey Bay, California
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Santa Cruz
Click for Map
Thu -- 12:11 AM PDT     5.22 feet High Tide
Thu -- 06:18 AM PDT     Sunrise
Thu -- 07:00 AM PDT     -0.02 feet Low Tide
Thu -- 09:07 AM PDT     Moonset
Thu -- 01:47 PM PDT     4.53 feet High Tide
Thu -- 07:16 PM PDT     2.45 feet Low Tide
Thu -- 08:09 PM PDT     Sunset
Thu -- 10:16 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.25.14.43.42.110.2-00.20.91.92.93.84.44.54.33.83.22.72.52.633.64.2

Tide / Current Tables for Santa Cruz, California
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Santa Cruz
Click for Map
Thu -- 12:06 AM PDT     5.06 feet High Tide
Thu -- 06:17 AM PDT     Sunrise
Thu -- 06:52 AM PDT     -0.07 feet Low Tide
Thu -- 09:07 AM PDT     Moonset
Thu -- 02:02 PM PDT     4.36 feet High Tide
Thu -- 07:07 PM PDT     2.43 feet Low Tide
Thu -- 08:09 PM PDT     Sunset
Thu -- 10:16 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.14.94.23.11.90.80.1-0.10.20.91.72.73.54.14.44.23.73.12.62.42.633.54.1

Weather Map
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wmap_P
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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (20,4,5,8)
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Ground Weather Radar Station San Francisco Bay Area, CA
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