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Marine Weather and Tides Cupertino, 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.

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Sunrise 6:15AM

Sunset 8:12PM

Wednesday August 5, 2020 6:08 PM PDT (01:08 UTC)

Moonrise 8:50PM

Moonset 7:07AM

Illumination 96%

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.

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7 Day Forecast for Marine Location Near Cupertino, CA

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Area Discussion for - San Francisco/Monterey Bay Area, CA

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FXUS66 KMTR 052353 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 453 PM PDT Wed Aug 5 2020

SYNOPSIS. Unseasonably cool conditions will persist through Thursday as temperatures slowly adjust toward near normal for the weekend. Drizzle or light rain is possible in coastal regions Thursday morning.

DISCUSSION. as of 02:21 PM PDT Wednesday . Afternoon satellite continues to show a deep marine layer impacting the the Bay Area. Breezy northwest winds are pushing this in the coast in most areas with some dry slots in the lee of prominent points such as Point Arena and Pigeon Point. These dry slots are keeping areas like coastal Sonoma and the Santa Cruz/Aptos area clear. As the winds ease overnight clouds should make a return into the Bay. However, the upper trough slowly creeping across the region may provide enough vertical mixing to clear out the region earlier on Thursday. This will be the challenge for the next 24 hours. For now the forecast indicates that we'll see a marine layer like this morning, but may need to show more clearing earlier. With the trough coming through, models are indicating the possibility of some light rain/drizzle in some coastal areas. This should be confined to the coastal areas, but with the deepening marine layer it may reach a little way inland. By Friday the upper trough will be shifting off to the east, allowing for a ridge to build over the region. This should compress the marine layer a bit causing a earlier burn off and slower onset. This means more daylight while the ridge is in place which yields a warming pattern. This pattern should hold through Saturday. Sunday will be a bit of a transition day as the ridge flattens out and as a trough over the Pacific Northwest begins to slowly dig southward once again. So as we get back into early next week, expect temps to drop to a few degrees below normal.

All told, the marine layer will play a significant role for the next day or two. Temps will slowly rise to near normal for the first part of the weekend with a slow slip to below normal for early next week.

As for winds, look for continued breezy conditions for the next day or two. As the ridge steps in and then the pattern flattens, winds should be easing quite a bit.

AVIATION. As of 04:52 PM PDT Wednesday . for 00z TAFs. A mix of MVFR to VFR conditions with stratus clouds streaming into the San Francisco Bay as well as the Monterey Bay. Cloud cover will thicken with cigs lowering to MVFR/IFR overnight. The marine layer is deep, around 3000 feet, so there remains another chance for light drizzle in the early morning hours, but again mostly closer to the coast. Clouds will have another late clearing on Thursday at most terminals after 18z. Winds remain breezy and onshore with several terminals having stronger gusts. This pattern will continue into Thursday with strongest winds at KSFO.

Vicinity of KSFO . MVFR. Winds remain onshore with stronger gusts from 25-30 kt. Low confidence in gusts exceeding 30 kts as they are expected to diminish overnight. MVFR ceilings will persist through the night and dissipate after 18z. VFR Thursday afternoon with strong onshore winds.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals..MVFR. Onshore winds have increased featuring some stronger gusts. Cigs will lower for IFR conditions overnight as winds decrease. Low confidence in chances for LIFR at KMRY. Cigs will lift after 18z, but cloud cover will remain around the terminals for MVFR conditions. Winds will increase Thursday afternoon with occasional stronger gusts.

MARINE. as of 02:01 PM PDT Wednesday . Moderate to breezy northwest winds will continue across the waters through late this week. Winds will ease slightly over the southern outer waters and parts of the coastline tomorrow with gusty conditions persisting elsewhere. Breezy winds are expected into early this evening over the San Francisco Bay around the Golden Gate Gap and northward through the Delta. These winds will generate steep fresh swells resulting in locally hazardous seas, especially for smaller vessels. A couple of light southerly swells will continue into the weekend.

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



PUBLIC FORECAST: BFG AVIATION: DK MARINE: AS

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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
RTYC1 - 9414523 - Redwood City, CA	16 mi	50 min	W 9.9 G 14	63°F	73°F		1015.4 hPa
AAMC1 - 9414750 - Alameda, CA	34 mi	50 min	W 13 G 17	62°F	69°F		1014 hPa
LNDC1	36 mi	50 min	WSW 13 G 20	62°F			1013.7 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA	37 mi	50 min	WSW 16 G 21
OBXC1	37 mi	50 min		61°F				59°F
MLSC1 - Moss Landing, South Harbor, CA	38 mi	32 min	W 14 G 38	60°F			1014.4 hPa	56°F
PXSC1	38 mi	50 min		63°F				58°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA	38 mi	50 min	WSW 11 G 22	61°F			1012.3 hPa
ELXC1 - Elkhorn Slough Reserve, CA	38 mi	83 min	WNW 14	65°F				59°F
OKXC1 - 9414776 - Oakland (Berth 34), CA	38 mi	50 min	W 14 G 19	62°F			1013.2 hPa
46092 - MBM1	39 mi	49 min	W 14	59°F	56°F		1014.9 hPa (-1.0)
FTPC1 - 9414290 - San Francisco, CA	40 mi	50 min	WSW 11 G 18	60°F	63°F		1013.7 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA	40 mi	28 min	WNW 9.7 G 14	60°F	57°F		1015.6 hPa	57°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA	44 mi	28 min	WNW 12 G 14	60°F			1015.6 hPa	56°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA	44 mi	50 min	SW 15 G 18	63°F			1013.1 hPa
46237 - San Francisco Bar, CA (142)	45 mi	68 min			58°F	4 ft
46114 - West Monterey Bay, CA	45 mi	72 min			58°F	5 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA	45 mi	40 min	SE 4.1	58°F			1015 hPa
RCMC1 - 9414863 - Richmond, CA	46 mi	50 min	SW 6 G 9.9	65°F	65°F		1012.6 hPa
46240 - Cabrillo Point, Monterey Bay, CA (158)	48 mi	72 min			60°F	2 ft

Wind History for Redwood City, CA

(wind in knots)    EDIT      (on/off)   Help

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
San Jose, San Jose International Airport, CA	8 mi	75 min	WNW 12	10.00 mi	Mostly Cloudy	67°F	53°F	61%	1014.9 hPa
Palo Alto Airport, CA	12 mi	81 min	W 11 G 18	10.00 mi	Mostly Cloudy	64°F	55°F	73%	1015.2 hPa
San Jose / Reid / Hillv, CA	13 mi	81 min	NNW 12	10.00 mi	Mostly Cloudy	68°F	55°F	64%	1015.2 hPa
San Carlos Airport, CA	18 mi	2.2 hrs	SW 9	10.00 mi	Overcast	64°F	55°F	73%	1015.6 hPa
Hayward, Hayward Air Terminal, CA	24 mi	74 min	WSW 13	10.00 mi	Overcast	65°F	54°F	68%	1015.5 hPa

Link to 5 minute data for KNUQ

Wind History from NUQ (wind in knots)

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Tide / Current Tables for Upper Guadalupe Slough, San Francisco Bay, California

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Tide / Current Tables for Dumbarton Point 2.3 mi NE, South San Francisco Bay, California Current

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Weather Map

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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

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Wind Forecast for San Francisco/Monterey Bay Area, CA (21,6,7,8)

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Ground Weather Radar Station San Francisco Bay Area, CA

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