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Marine Weather and Tides Sunnyvale, 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 5:55AM

Sunset 8:31PM

Saturday July 11, 2020 8:25 PM PDT (03:25 UTC)

Moonrise 11:41PM

Moonset 11:15AM

Illumination 59%

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 Sunnyvale, CA

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

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FXUS66 KMTR 112344 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 444 PM PDT Sat Jul 11 2020

SYNOPSIS. High pressure will dominate the weather pattern over the region this weekend resulting in very warm temperatures across the interior. Continued onshore flow will keep conditions near the coast cooler, yet still mild. A subtle cooling trend is on track to occur early next week.

DISCUSSION. as of 02:02 PM PDT Saturday . Marine layer has become nearly non-existent with the remainder of it having either dissipated over the Monterey Peninsula or traveled down to coastal southern Monterey county. Diurnal heating has resulted in temps up in the low-to-mid-90s around the East Bay, with locations within the Livermore Valley reporting temps between 92-97 F. A fire broke out due east of San Jose earlier today, where southwest winds and temps between 85-95 F have been prevalent. Thankfully, winds have remained light at 3-8 mph with gusts of 13 mph in that area, and the fire is fully contained at the time of this discussion's release. Similarly, low-to-mid RH values coupled with high temperatures can be found in other locations across the CWA, including interior portions of Monterey and San Benito counties and patches of the North Bay interior. Warm conditions and RH values in the 20s and low 30s are expected across that area going into the evening, with some isolated locations likely to record RH values in the teens. Thankfully, winds will remain light due to the upper-level ridge set up, but fire concerns will persist through tonight and going into Sunday.

The main focus for tonight's conditions will be the warmth and the low RH values across the interior. Minimum temps across several high-elevation locations remained fairly warm last night, with several sites along the East Hills reporting low-70s. We should expect for similar poor temperature recoveries across the interior tonight, along with poor humidity recoveries as the ridge reaches its maximum extent during the overnight hours and into early Sunday morning.

Sunday will be our warmest day across the CWA, with mild conditions dominating coastal areas tomorrow as the marine layer remains compressed and allows for greater diurnal heating. Temps along the coast will fall within the 65-75 F range. The interior is progged for much higher temps ranging from 95-100, with some isolated locations getting into the low 100s. Weak onshore flow is to be expected tomorrow as well, which will help to mitigate fire weather concerns. Models are suggesting that the stable conditions from the upper-level ridge will result in weak offshore flow. Nevertheless, the poor humidity recoveries along with warm mins overnight will still result in elevated fire weather and heat concerns for the day.

Looking ahead into next week, heights will fall across the CWA as the upper-level ridge weakens and allows for the intrusion of a disturbance off the Pacific into BC. Troughing will gradually become the more dominating upper-level pattern during the first half of next week, allowing for temperatures will return closer to seasonal averages. This disturbance will also allow for the marine layer to recover, bringing coastal locations back to more seasonal conditions as well. Expect the main setup for next week to be the cooling pattern as we see the gradual shift in our upper-level setup as the ridge weakens and makes its way out of the southwest as this trough takes over.

AVIATION. as of 4:42 PM PDT Saturday . for 00z TAFs. VFR, with breezy northwesterly winds, and the occasional stronger gusts. Large scale weather pattern remains in place, so forecast is very similar to last night featuring a compressed marine layer with a few clouds along the coast and bayshore, but otherwise VFR and light onshore winds. Chance for thicker low clouds near the Monterey Peninsula. Sunday is forecast for VFR with breezier onshore winds in the afternoon.

Vicinity of KSFO . VFR. Winds remain northwesterly around 20 kts and the chance of a few stronger gusts will persist through the early evening. Winds will dial back but remain breezy overnight. A few clouds near the terminal overnight, but forecast to remain VFR through the TAF period. Winds are once again expected to be strong in the afternoon and out of the northwest.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Northerly winds are breezy with VFR conditions. Most of tonight will be VFR but lower cigs may develop in the early morning hours for coastal terminals. Winds will ease overnight before picking up on Sunday. VFR is forecast with breezier onshore flow.

MARINE. as of 02:32 PM PDT Saturday . A robust northerly gradient will bring moderate to locally gusty northwest winds across the coastal waters through the weekend. These winds will generate steep fresh swell which will result in hazardous conditions for small craft vessels in the coastal waters. Locally moderate winds will also be present around Angel Island in the northern San Francisco Bay. Otherwise, a light longer period south swell will be mixed in with the steep fresh northwest swell.

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



PUBLIC FORECAST: Diaz AVIATION: DK MARINE: DRP

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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	14 mi	55 min	W 8.9 G 11	75°F	75°F		1015.2 hPa
AAMC1 - 9414750 - Alameda, CA	30 mi	55 min	W 6 G 8	66°F	72°F		1014.9 hPa
LNDC1	30 mi	55 min	WSW 8 G 9.9	68°F			1014.6 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA	32 mi	55 min	WSW 8.9 G 11
OBXC1	33 mi	55 min		66°F				56°F
OKXC1 - 9414776 - Oakland (Berth 34), CA	33 mi	55 min	W 5.1 G 6	66°F			1014.6 hPa
PXSC1	34 mi	55 min		65°F				54°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA	34 mi	55 min	ESE 1.9 G 2.9	65°F			1013.8 hPa
FTPC1 - 9414290 - San Francisco, CA	37 mi	55 min	WSW 15 G 22	60°F	62°F		1014.8 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA	39 mi	55 min	SSW 9.9 G 16	62°F			1014.8 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA	41 mi	57 min	S 5.1	65°F			1014 hPa
RCMC1 - 9414863 - Richmond, CA	42 mi	55 min	S 7 G 12	66°F	67°F		1014.1 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA	43 mi	55 min	WNW 9.9 G 13	83°F			1012.6 hPa
UPBC1	43 mi	55 min	WNW 12 G 14
46237 - San Francisco Bar, CA (142)	43 mi	55 min			58°F	5 ft
MZXC1 - 9415102 - Martinez-Amorco CA	43 mi	55 min	W 11 G 12	84°F	70°F		1013.2 hPa
PCOC1 - 9415144 - Port Chicago, CA	44 mi	55 min	W 4.1 G 6	85°F	74°F		1012.9 hPa
MLSC1 - Moss Landing, South Harbor, CA	44 mi	173 min	SW 8.9 G 26	59°F			1016.2 hPa	53°F
ELXC1 - Elkhorn Slough Reserve, CA	44 mi	100 min	SSW 6	62°F				55°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA	46 mi	55 min	SW 8.9 G 11	78°F			1013.3 hPa
46092 - MBM1	46 mi	66 min	NW 14	56°F	55°F		1014.6 hPa (-1.8)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA	48 mi	45 min	NNW 18 G 23	56°F			1016.6 hPa	53°F
46042 - MONTEREY - 27NM West of Monterey Bay, CA	49 mi	45 min	NW 19 G 23	56°F	55°F		1015.8 hPa	53°F

Wind History for Redwood City, CA

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NW9

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N3 G6

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NW5 G8

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W11 G14

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W6 G9

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NW2 G5

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N7 G10

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NW10 G13

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NW8 G11

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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	4 mi	32 min	NW 11	10.00 mi	Fair	78°F	50°F	37%	1014.5 hPa
Palo Alto Airport, CA	8 mi	4.4 hrs	NNW 15	10.00 mi	Clear	79°F	59°F	51%	1015.6 hPa
San Jose / Reid / Hillv, CA	10 mi	38 min	WNW 8	10.00 mi	Clear	82°F	42°F	25%	1014.6 hPa
San Carlos Airport, CA	16 mi	94 min	W 8	10.00 mi	Clear	79°F	46°F	32%	1014.6 hPa
Hayward, Hayward Air Terminal, CA	18 mi	31 min	SW 4	10.00 mi	Fair	69°F	54°F	59%	1015.5 hPa
Livermore, Livermore Municipal Airport, CA	21 mi	32 min	WSW 5	10.00 mi	Fair	88°F	21°F	9%	1013.3 hPa
Oakland, Metro Oakland International Airport, CA	23 mi	32 min	W 13	10.00 mi	Fair	69°F	54°F	59%	1014.7 hPa
San Francisco, San Francisco International Airport, CA	24 mi	29 min	NW 14	10.00 mi	Fair	64°F	50°F	60%	1014.5 hPa

Link to 5 minute data for KSJC

Wind History from SJC (wind in knots)

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NW8

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Calm

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1 day ago

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Calm

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SE6

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Tide / Current Tables for Gold Street Bridge, Alviso 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 (23,6,7,8)

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Ground Weather Radar Station San Francisco Bay Area, CA

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