Saturday, September19, 2020
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Marine Weather and Tides
Hayward, CA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 6:53AMSunset 7:10PM Saturday September 19, 2020 10:53 AM PDT (17:53 UTC) Moonrise 8:27AMMoonset 7:58PM Illumination 6% Phase: Waxing Crescent; Moon at 2 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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PZZ531 San Francisco Bay South Of The Bay Bridge- 830 Am Pdt Sat Sep 19 2020
Today..W winds 5 to 15 kt. Gusts up to 25 kt this afternoon.
Tonight..W winds 10 to 20 kt with gusts up to 25 kt.
Sun..NW winds 5 to 15 kt.
Sun night..W winds up to 10 kt.
Mon..W winds 5 to 15 kt with gusts up to 25 kt.
Mon night..W winds 5 to 15 kt with gusts up to 25 kt.
Tue..W winds 5 to 15 kt.
Wed..W winds 5 to 15 kt.
PZZ500 830 Am Pdt Sat Sep 19 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Winds will be generally light across the waters with locally stronger conditions along the big sur coast south of point sur. Winds will increase over the waters Saturday and into Saturday night. These winds will generate steep fresh swell resulting in hazardous seas conditions for smaller vessels. Mixed seas will continue with a shorter period northwest swell and a moderate period south to southwest swell. A longer period southwest swell will arrive Sunday morning.


7 Day Forecast for Marine Location Near Hayward, CA
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location: 37.62, -122.15     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 191742 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1042 AM PDT Sat Sep 19 2020

SYNOPSIS. A warming and drying trend is forecast through the rest of the weekend. Temperatures will then cool slightly on Monday and Tuesday, followed by warmer temperatures starting around the middle of next week.

DISCUSSION. as of 10:12 AM PDT Saturday . Forecast remains on track for a warming trend this weekend. Morning satellite continues to show some low clouds along portions of the coast, but these should clear out through the day. As of 10 AM temps are generally running about 3 degrees lower than yesterday at this time. This is due to be in the wake of a weak cold front that passed Friday. Transiting high pressure will bring the warming. The only other item of note is smoke from the August Lightning Complex is drifting into North Bay and will impact that area through the weekend.

PREV DISCUSSION. As of 3:47 AM PDT Friday . Water vapor imagery shows the majority of the moisture associated with the upper-level trough over British Columbia this morning, while the remainder of the moisture moves across Idaho, Montana, Wyoming, and the Great Basin. The center of the trough is currently over the PAC NW, with our CWA currently to the left of the axis. Following yesterday's cold frontal passage, temps fell across most of the interior while the marin layer inversion weakened substantially. Despite this setup, winds were light enough to limit much mixing, resulting in little clearing of coastal stratus yesterday afternoon. Based on both the Fort Ord and Bodega Bay profilers this morning, looking like the marine layer inversion is slowly bouncing back. The light winds have played out into the overall continuation of patchy low-stratus along the coast with some interior locations this morning also experiencing patchy fog. Can expect for low- stratus to become more widespread near the coast, the valleys, and the bays by daybreak as the marine layer continues to gradually rebuild.

850 hPa temps look progged by the HRRR to build back up across the interior this afternoon, while near-surface winds will also trend more northerly. As such, the culmination of greater diurnal heating as the trough axis exits our CWA and the resulting northerly winds will allow for interior surface temps to warm at least a few degrees today. Given this setup, adjustments to today's max temps were made due to the NBM not capturing warm enough temperatures across most of the interior. In terms of air quality, HRRR-smoke takes vertically integrated smoke plume from the August Complex down into parts of the North Bay as northerly flow picks up across the lower-atmosphere. As such, may see a deterioration of air quality conditions there. Smoke canopy overall is not as large as last week thanks to all of the clearing we experienced mid-week, so northerly winds not expected to produce air quality deterioration to last week's levels should the smoke plume from the August Complex make it down to the SF Peninsula and East Bay.

For more information on air quality concentrations, be sure to reach out to the Bay Area Air Quality Network and/or AirNow.

This drying trend following the trough exit will be enhanced through Sunday as zonal ridging becomes the dominant factor along the West Coast. Rising mid-level heights will result in a continuation of warming trend, along with drying trend all while onshore flow weakens and marine layer expansion is once again limited. Expect Sunday to be the warmest day of the weekend, with interior max temps to be 5 to 10 degrees warmer than average as a result.

Nevertheless, this warming trend will come to a halt Monday and Tuesday as mid-range guidance introduces a shortwave trough that moves right along the same area that this week's upper-level trough moved over. As its axis moves ashore, mid-level heights will once again fall across the West Coast, resulting in a cooling trend that will bring temps in our CWA back to near seasonal average, especially by Tuesday. Once the shortwave exits the region, mid-level heights are progged to increase yet again across the CWA, resulting in a warming trend that will last through the second half of next week.

Looking ahead into the long range, the question becomes how long this warming trend will last. ECMWF ENS and GEPS both are hinting at the potential for both much warmer temps during the final weekend of September, while the GEFS is a little less robust on mid-level heights. That being said, all three ensembles have been hinting at an offshore wind signature, with northerly and northeasterly winds developing across the CWA. While still over 200 hours out, this pattern would be a major concern for both current active wildfire efforts and pose a new challenge for preventing wildfire starts. Stay tuned.

AVIATION. As of 10:42 AM PDT Saturday . for 18Z TAFS. VFR as the last of the remaining morning clouds are mixing out. Winds are light and onshore, but are expected to increase Saturday afternoon with a few stronger gusts through coastal gaps. Higher pressure should provide VFR/MVFR over Saturday night and into Sunday morning, with any developing cigs around 1000 feet. Northerly winds will drift smoke from Northern California into the North Bay in the early morning, but no major impacts to vis expected.

Vicinity of KSFO . VFR. Onshore winds increasing Saturday afternoon to 15 kts with gusts of 20 to 25 kts. MVFR overnight as the marine layer struggles to rebuild, but still bringing a layer of cigs to the terminals as winds ease.

SFO Bridge Approach . Similar to SFO, potential for smoke and haze aloft over the North Bay early Sunday morning impacting slant range visibility.

Monterey Bay Terminals . VFR. Onshore winds will be breezy Saturday afternoon. Low confidence in marine layer redevelopment overnight; but with consistent seabreeze, MVFR cigs possible with IFR closer to the coast.

MARINE. as of 08:30 AM PDT Saturday . Winds will be generally light across the waters with locally stronger conditions along the Big Sur Coast south of Point Sur. Winds will increase over the waters Saturday and into Saturday night. These winds will generate steep fresh swell resulting in hazardous seas conditions for smaller vessels. Mixed seas will continue with a shorter period northwest swell and a moderate period south to southwest swell. A longer period southwest swell will arrive Sunday morning.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pigeon Pt to Pt Pinos 0-10 nm from 3 PM SCA . Pt Arena to Pigeon Pt 10-60 nm from 3 PM SCA . Pt Arena to Pt Reyes 0-10 nm from 2 PM SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm



PUBLIC FORECAST: Garcia/Diaz/Dykema AVIATION: DK MARINE: DK

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 8 mi59 min NW 6 G 8 63°F 73°F1017.4 hPa
AAMC1 - 9414750 - Alameda, CA 13 mi59 min WSW 1.9 G 4.1 63°F 67°F1016.9 hPa
LNDC1 14 mi59 min W 1 G 5.1 64°F 1016.7 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 16 mi59 min SW 1.9 G 2.9
OBXC1 16 mi59 min 63°F 62°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi59 min W 1 G 2.9 64°F 1016.7 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 18 mi59 min E 4.1 G 5.1 63°F 1015.7 hPa
PXSC1 18 mi59 min 65°F
FTPC1 - 9414290 - San Francisco, CA 21 mi59 min SW 1.9 G 8.9 63°F 64°F1016.9 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 23 mi59 min S 6 G 7 63°F 1017.1 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 25 mi54 min SSE 4.1 64°F 1017 hPa
RCMC1 - 9414863 - Richmond, CA 25 mi59 min SSE 1.9 G 4.1 65°F 65°F1016.4 hPa
46237 - San Francisco Bar, CA (142) 28 mi53 min 60°F3 ft
UPBC1 29 mi59 min WNW 7 G 9.9
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi59 min WNW 8.9 G 11 65°F 68°F1016.4 hPa
PCOC1 - 9415144 - Port Chicago, CA 31 mi59 min WSW 8.9 G 12 65°F 68°F1016.1 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 31 mi59 min W 5.1 G 7 65°F 1016.3 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 32 mi59 min WNW 8 G 11 68°F 1015.9 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 38 mi33 min WNW 7.8 G 12 61°F1017.3 hPa
SFXC1 - San Francisco Bay Reserve, CA 41 mi68 min NW 4.1
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 43 mi43 min NW 9.7 G 12 60°F 1017.3 hPa60°F

Wind History for Redwood City, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hayward, Hayward Air Terminal, CA3 mi59 minWSW 310.00 miOvercast67°F57°F71%1017.5 hPa
Oakland, Metro Oakland International Airport, CA7 mi60 minWSW 410.00 miMostly Cloudy68°F57°F68%1016.8 hPa
San Carlos Airport, CA8 mi66 minNW 510.00 miOvercast64°F59°F83%1016.9 hPa
Palo Alto Airport, CA10 mi66 minVar 410.00 miMostly Cloudy64°F57°F78%1016.9 hPa
San Francisco, San Francisco International Airport, CA11 mi57 minWNW 910.00 miMostly Cloudy64°F57°F78%1016.7 hPa
Mountain View, Moffett Field, CA14 mi4 hrsN 010.00 miA Few Clouds59°F55°F88%1016.3 hPa
Livermore, Livermore Municipal Airport, CA18 mi60 minWSW 510.00 miPartly Cloudy67°F55°F66%1016.1 hPa
Half Moon Bay Airport, CA20 mi58 minN 77.00 miOvercast63°F59°F88%1017.3 hPa
San Jose, San Jose International Airport, CA21 mi60 minVar 410.00 miMostly Cloudy67°F55°F66%1016.6 hPa

Link to 5 minute data for KHWD

Wind History from HWD (wind in knots)
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Last 24hrW8W6W11W12W11NW14W9W10NW11W11W11W9W6W6W7W5CalmNW5W6CalmW5W33W3
1 day agoW4NW6NW4W12W11NW13W9W7W6W8W4W6W9W6W9W9W7NW3NW4CalmCalmCalmCalmSW3
2 days ago4CalmW6W11W11W13W15W13W9W8W5CalmSW3SW4SW4CalmCalmCalmW4S3SE3CalmCalmCalm

Tide / Current Tables for Alameda Creek, San Francisco Bay, California
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Alameda Creek
Click for Map
Sat -- 02:18 AM PDT     6.30 feet High Tide
Sat -- 06:54 AM PDT     Sunrise
Sat -- 09:28 AM PDT     Moonrise
Sat -- 09:36 AM PDT     0.15 feet Low Tide
Sat -- 02:44 PM PDT     6.53 feet High Tide
Sat -- 07:09 PM PDT     Sunset
Sat -- 08:57 PM PDT     Moonset
Sat -- 10:10 PM PDT     0.07 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.65.36.26.25.54.53.21.90.80.20.31.334.86.26.56.15.23.92.51.30.40.10.5

Tide / Current Tables for Little Coyote Pt 3.1 mi ENE, South San Francisco Bay, California Current
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Little Coyote Pt 3.1 mi ENE
Click for Map
Sat -- 02:00 AM PDT     -0.01 knots Slack
Sat -- 04:28 AM PDT     -0.90 knots Max Ebb
Sat -- 06:54 AM PDT     Sunrise
Sat -- 07:29 AM PDT     0.00 knots Slack
Sat -- 09:28 AM PDT     Moonrise
Sat -- 10:38 AM PDT     0.79 knots Max Flood
Sat -- 02:12 PM PDT     -0.01 knots Slack
Sat -- 04:50 PM PDT     -0.97 knots Max Ebb
Sat -- 07:09 PM PDT     Sunset
Sat -- 07:57 PM PDT     0.00 knots Slack
Sat -- 08:58 PM PDT     Moonset
Sat -- 11:11 PM PDT     0.83 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.4-0-0.5-0.9-0.9-0.6-0.20.20.50.70.80.60.40.1-0.4-0.8-1-0.8-0.400.40.70.8

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

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Ground Weather Radar Station San Francisco Bay Area, CA
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