Tuesday, September22, 2020
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L-36.com

Marine Weather and Tides
Byron, 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 6:54AMSunset 7:04PM Tuesday September 22, 2020 5:41 AM PDT (12:41 UTC) Moonrise 12:04PMMoonset 9:57PM Illumination 27% Phase: Waxing Crescent; Moon at 5 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- 236 Am Pdt Tue Sep 22 2020
Today..W winds up to 10 kt, increasing to 10 to 20 kt with gusts up to 25 kt this afternoon.
Tonight..W winds 10 to 20 kt with gusts up to 25 kt.
Wed..W winds 5 to 15 kt with gusts up to 25 kt.
Wed night..W winds 5 to 15 kt.
Thu..W winds 10 to 20 kt with gusts up to 25 kt.
Thu night..W winds 5 to 15 kt.
Fri..W winds 10 to 20 kt with gusts up to 25 kt.
Sat..W winds 5 to 15 kt.
PZZ500 236 Am Pdt Tue Sep 22 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A 1020 mb high is centered 900 miles west of pt pinos. A 979 mb low is in the gulf of alaska. This low will generate a large northwest swell that will arrive Thursday and Friday. Northwest winds will be light to moderate with the strongest winds along the inner coastal waters.


7 Day Forecast for Marine Location Near Byron, CA
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location: 37.82, -121.73     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 221140 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 440 AM PDT Tue Sep 22 2020

SYNOPSIS. Temperatures remain at or just below normal despite gradually cooling through Thursday. Winds will remain onshore, driven by the weak cold front passing through. Friday will begin to warm before higher pressure along the coast sets up over the weekend ushering in a return to hot temperatures for the Bay Area. These hot temperatures will be coupled with dry offshore winds and lower humidities. Warmer temperatures remain next week as the higher pressure only shifts slightly to the east.

DISCUSSION. as of 03:00 AM PDT Tuesday . High clouds pass over the Bay Area this evening as a short wave upper level trough moves eastward over the region. Patchy fog is being reported around coastal areas, but the short wave has driven a compression of the marine layer to below 800 feet; however, satellite is showing stratus redeveloping along the coastline. Clouds should rebuild and move over the Bay Area over the course of the morning. Patchy, dense fog is also possible for low lying coastal areas.

A long wave trough over the Gulf of Alaska extends southward to the Oregon/California border and will move toward British Columbia through the course of the week. Meanwhile, higher pressure will develop over the southeastern Pacific Ocean, stretching a ridge northeastward over the Southern California and most of the Bay Area and Central Coast. This set-up will drive consistent onshore flow over the region. Temperatures will moderate and remain at seasonal levels in the 70s and 80s, if not slightly cooler, through Thursday. A weak cold front ahead of the long wave trough will pass over the California coastline on Thursday. Most of the front will be north of Sonoma county, so very little impacts are expected with the front; but there is a chance of some light drizzle possible in the coastal North Bay Thursday.

500 mb heights will begin lowering on Thursday as the long wave trough moves eastward toward the Rockies. By Friday, the trough axis will be east of Nevada with high pressure developing over the Pacific Ocean. As the trough digs toward the Great plains and high pressure strengthens, the forecast becomes focused on a stark warm up of temperatures with winds turning to offshore.

Confidence is increasing as models have consistently showed increasing high pressure over the weekend reaching a max height of 597 dm just of the coast. 850 mb temperatures on both the GFS and Euro are between 24-26 degrees Celsius. It's a far cry from the 600 dm high that was over the Four Corners over the Labor Day weekend heat wave with 850 mb temps up to 30, but it will be strong enough to raise temperatures into the 90s and lower-100s for inland areas. Temperatures in the 80s are expected closer to the coast, but since this pattern will also set-up offshore winds the chance still exists to update the forecast to warmer coastal temperatures. Given that the event is still several days away, there is lower confidence that the offshore winds will mix down to the surface, driving the warmer temperatures. For now, the strongest winds will be at elevated terrain in North Bay Mountains and East Bay Hills. The Santa Cruz Mountains are possible, but there is lower confidence at this time. At this time, strongest wind gusts will likely be at the highest peaks and ridges around 30 to 35 mph. Winds are expected to begin gradually rotating to the north late on Friday evening, but the main timeline for the stronger offshore winds will be Saturday morning through early Monday morning, with peak winds on Sunday morning. The offshore winds will also eliminate any impacts of the marine layer and bring drier air over the Bay Area, reducing humidities and raising fire concerns which will be monitored as new information comes in and confidence increases.

By Monday, models start to disagree, but the high pressure looks to only shift slightly eastward with the next trough building and approaching the west coast by midweek next week. While hottest temperatures are expected on Sunday and Monday, it is expected to remain warm in the middle of next week, though temperatures will begin to decrease. However, the dry conditions will remain, with no substantial precipitation in the forecast.

AVIATION. As of 4:35 AM PDT Tuesday . Marine layer compressed this morning and is near 1000 feet. Satellite imagery shows stratus limited to the northern part of the Bay Area impacting mainly SFO and OAK. Areas of fog in the MRY Bay Area. Clouds expected to scatter out by 17z. Drier air aloft mixes down to the surface tonight resulting in less low stratus.

Vicinity of KSFO . IFR with bases around 800 ft. Clearing after 17Z. Breezy this afternoon with winds sustained to 20 kt gusting to near 30 kt.

SFO Bridge Approach . Possible lowered slant-range vis from haze, otherwise similar to KSFO.

Monterey Bay Terminals . IFR . areas of LIFR for fog reducing vsbys to 1/2 mile through 14Z. Clearing expected after 17Z with northwest winds to 10 kt in the afternoon.

BEACHES. as of 04:38 AM PDT Tuesday . A deep low in the Gulf of Alaska will produce a large long-period swell train that will arrive late Thursday evening and into Friday morning. Swells by then could be up to 9 to 11 ft with a 16 to 18 second period. The main impacts will be increased wave heights breaking near the shoreline and an increased risk of rip currents developing along coastal beaches. With the increase in temperatures inland expected this weekend, beachgoers should be mindful of the increased wave activity and rip currents. The wave activity is forecast to gradually decrease through the weekend, but caution is advised through at least Sunday morning.

MARINE. as of 04:15 AM PDT Tuesday . A 1020 mb high is centered 900 miles west of Pt Pinos. A 979 mb low is in the Gulf of Alaska. This low will generate a large northwest swell that will arrive Thursday and Friday. Northwest winds will be light to moderate with the strongest winds along the inner coastal waters.

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 until 9 AM SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm from 3 PM



PUBLIC FORECAST: DK AVIATION: W Pi MARINE: W Pi

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 17 mi54 min W 6 G 11 64°F 1013.8 hPa
PCOC1 - 9415144 - Port Chicago, CA 23 mi54 min SSW 7 G 14 61°F 69°F1014.2 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 26 mi54 min SSE 2.9 G 5.1 62°F 69°F1014.7 hPa
UPBC1 26 mi54 min SSW 1.9 G 4.1
LNDC1 29 mi54 min SW 5.1 G 7 60°F 1015.7 hPa
AAMC1 - 9414750 - Alameda, CA 30 mi54 min SW 7 G 11 68°F
SFXC1 - San Francisco Bay Reserve, CA 31 mi57 min W 6
OBXC1 32 mi54 min 59°F 59°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 32 mi54 min SW 7 G 8.9 59°F 1015.7 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 32 mi54 min WSW 9.9 G 12
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 33 mi54 min SW 8.9 G 12 62°F 1014.4 hPa
RTYC1 - 9414523 - Redwood City, CA 33 mi54 min S 1.9 G 4.1 61°F 73°F1016.4 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 34 mi54 min SSE 8.9 G 13 60°F 1015.8 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 35 mi54 min WSW 4.1 G 8 58°F 1014.6 hPa
PXSC1 35 mi54 min 60°F
RCMC1 - 9414863 - Richmond, CA 37 mi54 min SSE 7 G 9.9
TIBC1 - Tiburon Pier, San Francisco Bay, CA 38 mi37 min Calm 58°F 1015 hPa
FTPC1 - 9414290 - San Francisco, CA 39 mi54 min WSW 8.9 G 13 63°F
46237 - San Francisco Bar, CA (142) 48 mi42 min 59°F4 ft

Wind History for Port Chicago, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Livermore, Livermore Municipal Airport, CA10 mi49 minN 010.00 miFair58°F55°F90%1014.8 hPa
Concord, Buchanan Field, CA20 mi49 minS 1310.00 miSmoke62°F55°F80%1013.4 hPa
Hayward, Hayward Air Terminal, CA23 mi48 minW 510.00 miOvercast63°F55°F78%1016.7 hPa

Link to 5 minute data for KLVK

Wind History from LVK (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmSW3NW5W8W10W12NW10W10W13W9W7NW5NW9NW6CalmW4NW3NW4NW3Calm
1 day agoCalmCalmCalmE3CalmCalmE6NE5Calm5SW5W9W12W9W7W3CalmNE3CalmCalmCalmCalmCalmE3
2 days agoCalmSW3S34W53S6463E7W8W11W9W6CalmCalmCalmE3CalmCalmCalmE3Calm

Tide / Current Tables for Borden Highway Bridge, Old River, San Joaquin River, California
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Borden Highway Bridge
Click for Map
Tue -- 05:33 AM PDT     0.04 feet Low Tide
Tue -- 06:54 AM PDT     Sunrise
Tue -- 11:51 AM PDT     2.49 feet High Tide
Tue -- 01:03 PM PDT     Moonrise
Tue -- 05:00 PM PDT     0.82 feet Low Tide
Tue -- 07:02 PM PDT     Sunset
Tue -- 10:56 PM PDT     Moonset
Tue -- 10:58 PM PDT     3.25 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.82.21.50.90.40.10.10.40.91.52.12.42.52.31.81.310.811.422.73.13.3

Tide / Current Tables for West Island Lt .5 mi SE, San Joaquin River, California Current
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West Island Lt .5 mi SE
Click for Map
Tue -- 12:37 AM PDT     -0.84 knots Max Ebb
Tue -- 04:48 AM PDT     0.00 knots Slack
Tue -- 06:55 AM PDT     Sunrise
Tue -- 07:44 AM PDT     0.34 knots Max Flood
Tue -- 10:31 AM PDT     -0.00 knots Slack
Tue -- 01:04 PM PDT     Moonrise
Tue -- 01:11 PM PDT     -0.48 knots Max Ebb
Tue -- 04:02 PM PDT     0.00 knots Slack
Tue -- 06:56 PM PDT     0.48 knots Max Flood
Tue -- 07:03 PM PDT     Sunset
Tue -- 09:57 PM PDT     -0.00 knots Slack
Tue -- 10:56 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.8-0.8-0.7-0.6-0.300.20.30.30.30.1-0.1-0.4-0.5-0.4-0.3-00.20.40.50.40.2-0-0.4

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
Ground Weather Radar Station Sacramento, CA
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