Thursday, July9, 2020
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Marine Weather and Tides
Piedmont, 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 5:53AMSunset 8:34PM Wednesday July 8, 2020 11:57 PM PDT (06:57 UTC) Moonrise 10:22PMMoonset 8:19AM Illumination 85% Phase: Waning Gibbous; Moon at 19 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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PZZ530 San Pablo Bay, Suisun Bay, The West Delta And The San Francisco Bay North Of The Bay Bridge- 829 Pm Pdt Wed Jul 8 2020
Tonight..SW winds 5 to 15 kt.
Thu..SW winds 5 to 15 kt.
Thu night..SW winds 5 to 15 kt.
Fri..SW winds 5 to 15 kt with gusts up to 25 kt.
Fri night..SW winds 5 to 15 kt.
Sat..SW winds 10 to 20 kt with gusts up to 30 kt.
Sat night..SW winds 5 to 10 kt.
Sun..SW winds 5 to 15 kt.
Mon..SW winds 5 to 15 kt.
PZZ500 829 Pm Pdt Wed Jul 8 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Winds out of the northwest will prevail and remain gusty through tonight as high pressure remains over the eastern pacific. These winds will generate steep fresh swell resulting in hazardous seas conditions, particularly for smaller vessels. Winds will begin to ease Thursday night into Friday over much of the waters, but remain locally breezy over the northern outer waters. Mixed seas will persist with a shorter period wind driven northwest wave and a more moderate period southerly swell.


7 Day Forecast for Marine Location Near Piedmont, CA
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location: 37.85, -122.22     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 090531 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1031 PM PDT Wed Jul 8 2020

SYNOPSIS. A warming and drying trend will occur through the remainder of the work week and into the upcoming weekend, especially across the interior. Meanwhile, seasonable conditions are likely near the coast with periods of night and morning low clouds giving way to mostly sunny afternoon conditions.

DISCUSSION. As of 8:55 PM PDT Wednesday . Skies remain mostly clear this evening except for increasing areas of low clouds near Monterey Bay and a patch of stratus in western San Mateo County. Low clouds are expected to gradually increase along the coast from San Francisco southward overnight, and also develop inland from Monterey Bay. However, a relatively robust 5.0 mb surface pressure gradient from ACV to SFO will likely be sufficient to keep most of the North Bay clear overnight, and limit inland intrusion of low clouds in the SF Bay Area to only a few patches around SF Bay late tonight and early on Thursday. Another limiting factor on inland development of low clouds/fog overnight is the relatively shallow depth of the marine layer - currently just over 1000 feet at Fort Ord.

Models agree that an upper ridge will build over the Desert Southwest through the remainder of the work week, and also expand to the northwest across California, particularly over the upcoming weekend. This will result in a continuation of a gradual warming trend through Sunday. The warming trend will primarily impact inland areas, as persistent onshore surface flow maintains seasonably mild temperatures near the ocean. The gradual warming trend may stall on Friday, or even reverse a few degrees in the North Bay Valleys, when the north-to-south surface pressure gradient weakens. But overall, the trend will be for gradual inland warming, with temperatures expected to peak on Sunday. Lower to mid 90s will become more common across the interior tomorrow, while a few of the warmer spots such as Lake Berryessa and Pinnacles National Park may reach 100. By Sunday, widespread mid to upper 90s are likely in the interior valleys, with the warmest inland valley spots expected to see highs in the 100-107 degree range.

In addition to a warming trend, the airmass over the interior is forecast to become even drier through Sunday. Daytime minimum relative humidity will be as low as the single digits, especially over the weekend, while nighttime humidity recovery in the hills above 1500 feet will be poor. These warm and dry conditions will be a concern from a fire weather perspective. Fortunately, winds are expected to be relatively light through the weekend, except for local moderate and gusty afternoon and evening seabreeze winds.

From Previous Discussion . Medium range forecast guidance and ensembles indicates the ridge of high pressure over the Four Corners will weaken in response to troughing over the Pacific Northwest during the first half of next week. This will result in a cooling trend (most notably across the interior) along with breezy onshore winds.

AVIATION. As of 10:31 PM PDT Wednesday . For 06z TAFs. Patchy cloud cover have moved over coastal terminals, though VFR conditions are still present and forecast through the TAF period; the exception still being near the Monterey Peninsula dropping to IFR later tonight. Onshore winds will prevail through the TAF period with lighter winds overnight and stronger winds Thursday afternoon, with stronger gusts possible, with widespread VFR.

Vicinity of KSFO . FEW cigs at 1200 ft AGL as KHAF is at MVFR. While a few clouds could spill over the Bay, there is low confidence in lower cigs at KSFO for tonight. Winds are still breezy and onshore, though lighter than earlier tonight. VFR is forecast on Thursday with stronger onshore winds with occasional gusts.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . MVFR already at KMRY with VFR elsewhere. IFR and even LIFR is possible for terminals closer to the coast. MVFR is expected farther inland with IFR possible. Winds remain onshore and breezy, but will ease overnight. Clouds should mix out by 18z for VFR, with stronger onshore winds Thursday afternoon.

MARINE. as of 8:29 PM PDT Wednesday . Winds out of the northwest will prevail and remain gusty through tonight as high pressure remains over the eastern Pacific. These winds will generate steep fresh swell resulting in hazardous seas conditions, particularly for smaller vessels. Winds will begin to ease Thursday night into Friday over much of the waters, but remain locally breezy over the northern outer waters. Mixed seas will persist with a shorter period wind driven northwest wave and a more moderate period southerly swell.

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 . Pigeon Pt to Pt Piedras Blancas 10-60 nm SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm until 3 AM



PUBLIC FORECAST: Dykema/RGass AVIATION: DK MARINE: DK

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LNDC1 5 mi57 min S 6 G 7 58°F 1011.9 hPa (+0.5)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 7 mi57 min SW 8.9 G 12
AAMC1 - 9414750 - Alameda, CA 7 mi57 min SW 8.9 G 11 57°F 72°F1012.1 hPa (+0.5)
OBXC1 7 mi57 min 58°F 55°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 7 mi57 min SW 5.1 G 7 58°F 1011.8 hPa (+0.5)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 9 mi57 min S 16 G 20 58°F 1011.7 hPa (+0.8)
PXSC1 10 mi57 min 57°F 53°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 10 mi57 min ESE 4.1 G 7 56°F 1010.8 hPa (+0.6)
RCMC1 - 9414863 - Richmond, CA 11 mi57 min S 17 G 21 57°F 65°F1011.1 hPa (+0.9)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 12 mi41 min SE 7 56°F 1011 hPa
FTPC1 - 9414290 - San Francisco, CA 13 mi57 min SSW 2.9 G 12 55°F 62°F1011.8 hPa (+0.7)
UPBC1 14 mi57 min WNW 6 G 8.9
MZXC1 - 9415102 - Martinez-Amorco CA 14 mi57 min NW 8.9 G 9.9 65°F 69°F1010.2 hPa (+0.9)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 14 mi57 min WSW 9.9 G 14 62°F 1010.3 hPa (+1.1)
PCOC1 - 9415144 - Port Chicago, CA 17 mi57 min SW 8 G 11 61°F 70°F1009.9 hPa (+1.2)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 22 mi57 min WNW 9.9 G 13 71°F 1008.8 hPa (+0.4)
46237 - San Francisco Bar, CA (142) 22 mi57 min 59°F5 ft
RTYC1 - 9414523 - Redwood City, CA 24 mi57 min WNW 6 G 8.9 60°F 74°F1012.7 hPa (+0.9)
SFXC1 - San Francisco Bay Reserve, CA 26 mi72 min WSW 6
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 33 mi147 min NW 16 G 19 54°F 1012 hPa51°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 49 mi157 min NW 16 G 19 1013.1 hPa

Wind History for Oakland Middle Harbor, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA10 mi64 minW 810.00 miPartly Cloudy59°F52°F78%1012.6 hPa
Concord, Buchanan Field, CA13 mi64 minS 1310.00 miFair63°F50°F63%1008.9 hPa
Hayward, Hayward Air Terminal, CA14 mi63 minWNW 910.00 miFair59°F51°F75%1013 hPa
San Francisco, San Francisco International Airport, CA18 mi61 minW 1210.00 miA Few Clouds56°F50°F81%1012.1 hPa
San Carlos Airport, CA22 mi62 minW 510.00 miFair61°F50°F68%1012.5 hPa
Livermore, Livermore Municipal Airport, CA24 mi64 minNW 710.00 miFair59°F52°F78%1010.9 hPa

Link to 5 minute data for KOAK

Wind History from OAK (wind in knots)
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Last 24hrCalmS4W7SW6SW5SW6CalmCalmSW4SW45SW3W9W13NW13W14W14W14W12W14W14W11W11W8
1 day agoW9SW9W8W8W6SW4SW7SW7SW12SW6SW5SW5W6W10W12W12W14NW10W9W4W7W6W8Calm
2 days agoW7SW64CalmW6S8S6W11S54SW4W9W15W14W17W16W13W17W11W13W16W15W10W13

Tide / Current Tables for Berkeley, San Francisco Bay, California
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Oakland Harbor WebStreeter Street, San Francisco Bay, California Current
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Oakland Harbor WebStreeter Street
Click for Map
Thu -- 12:16 AM PDT     0.68 knots Max Flood
Thu -- 02:57 AM PDT     -0.00 knots Slack
Thu -- 05:55 AM PDT     Sunrise
Thu -- 06:06 AM PDT     -1.27 knots Max Ebb
Thu -- 09:59 AM PDT     0.01 knots Slack
Thu -- 10:20 AM PDT     Moonset
Thu -- 01:16 PM PDT     0.99 knots Max Flood
Thu -- 04:36 PM PDT     -0.00 knots Slack
Thu -- 06:46 PM PDT     -0.68 knots Max Ebb
Thu -- 08:33 PM PDT     Sunset
Thu -- 10:16 PM PDT     0.00 knots Slack
Thu -- 11:50 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.60.4-0-0.6-1-1.3-1.2-0.9-0.500.50.810.90.70.3-0.2-0.6-0.7-0.5-0.3-0.10.2

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (2,6,7,8)
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Ground Weather Radar Station Sacramento, CA
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