Monday, September21, 2020
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Marine Weather and Tides
Atwater, 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 6:48AMSunset 7:01PM Monday September 21, 2020 2:06 AM PDT (09:06 UTC) Moonrise 10:47AMMoonset 9:09PM Illumination 17% Phase: Waxing Crescent; Moon at 4 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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PZZ535 Monterey Bay- 936 Pm Pdt Sun Sep 20 2020
Tonight..S winds 5 to 15 kt, becoming W around 5 kt after midnight. Wind waves 1 to 2 ft. W swell 2 to 4 ft at 8 seconds.
Mon..W winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 2 to 4 ft at 10 seconds and sw around 2 ft at 20 seconds.
Mon night..N winds 5 to 15 kt. Wind waves 1 ft. W swell 2 to 4 ft at 9 seconds and sw around 2 ft at 19 seconds.
Tue..W winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. W swell 2 to 4 ft at 10 seconds and sw around 2 ft at 18 seconds.
Tue night..N winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 2 to 4 ft at 10 seconds and sw around 2 ft at 17 seconds.
Wed..W winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 5 ft. W swell 2 to 4 ft at 10 seconds and sw around 2 ft at 16 seconds.
Wed night..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 2 to 3 ft at 10 seconds and sw around 2 ft at 16 seconds.
Thu..NW winds 10 to 20 kt. Wind waves 1 to 2 ft. W swell 5 to 7 ft and S around 2 ft.
Fri..NW winds 10 to 20 kt. Wind waves 1 to 2 ft. W swell 6 to 8 ft and sw around 2 ft. Locally lower winds and seas across sheltered portions of the bay.
PZZ500 936 Pm Pdt Sun Sep 20 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A surface ridge of high pressure over the eastern pacific will move slowly eastward reaching our coastal waters by mid to late week. Gusty northwest winds over the northern waters tonight will extend to the inner coastal waters Monday. Mixed seas will persist with a shorter period northwest swell and a longer period southwest swell. Expect northwest swell to build late this week.


7 Day Forecast for Marine Location Near Atwater, CA
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location: 37.35, -120.61     debug


Area Discussion for - San Joaquin Valley/Hanford, CA
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FXUS66 KHNX 202327 AFDHNX

Area Forecast Discussion National Weather Service Hanford CA 425 PM PDT Sun Sep 20 2020

. UPDATED AIR QUALITY SECTION .

SYNOPSIS. Continued dry and slightly warmer through Monday then little changes are expected through the rest of the week, with temperatures near seasonal averages. Mainly clear skies will prevail, except for some areas of smoke and haze, especially across the Sierra Nevada and adjacent foothills. High pressure could bring the beginning of a more significant warmup by next Sunday.

DISCUSSION. A moderate westerly flow over the region brought clearer skies to much of our area yesterday as smoke from area fires was transported more to the east. Temperatures were mild as well, with highs running a few degrees below climo. This afternoon is seeing less westerly flow and smoke is tracking more south to north. Current 24 hr temperature trends are mostly running up a few degrees across the area and highs should be close to seasonal averages this afternoon.

Monday will bring a couple more degrees of warming as flow becomes more southwest and heights increase a bit ahead of a weak shortwave impulse moving into the west coast. The weak impulse will track inland Tuesday and our temperatures will trend back downward slightly along with some increased gusty winds over the mountains.

A more significant developing low pressure trough moving into the northwest coast will provide a broadly cyclonic flow across our region through the end of the week. This will keep conditions mild, with seasonable overnight lows and high temperatures running around 3-6 degrees below normal for the second half of the week. Moisture associated with the inland moving trough remains well north of our area and the forecast is free of precipitation through the week.

By next Sunday, a high pressure ridge will begin to rebuild along the west coast and temperatures over central California will start to trend back upward, returning to at or slightly above seasonal averages. We can also expect a return to a more stagnant pattern under the strengthening ridge of high pressure.

AVIATION. Areas of MVFR visibility and local IFR visibility due to smoke will continue across the Sierra Nevada and adjacent foothills for the next 24 hours. Elsewhere across the central CA interior, local MVFR visibility due to smoke and haze will continue for the next 24 hours.

AIR QUALITY ISSUES. On Monday September 21 2020 . Unhealthy in Sequoia National Park and Forest. Unhealthy for sensitive groups in Kern County.

Further information is available at Valleyair.org


CERTAINTY.

The level of certainty for days 1 and 2 is high. The level of certainty for days 3 through 7 is medium.

Certainty levels include low . medium . and high. Please visit www.weather.gov/hnx/certainty.html for additional information an/or to provide feedback.

HNX WATCHES/WARNINGS/ADVISORIES. None.

public . JEB aviation/fw . JEB

weather.gov/hanford


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ELXC1 - Elkhorn Slough Reserve, CA 70 mi81 min ENE 1.9 56°F 56°F
MLSC1 - Moss Landing, South Harbor, CA 73 mi160 min Calm G 0 56°F 1007.7 hPa56°F

Wind History for Monterey, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Merced / Castle Air Force Base, CA3 mi71 minN 02.50 miFair61°F57°F88%1010.8 hPa
Merced Regional Airport, CA6 mi73 minN 08.00 miFair61°F51°F70%1010.7 hPa

Link to 5 minute data for KMER

Wind History from MER (wind in knots)
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Last 24hrCalmCalmCalmCalmCalm----------CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
1 day agoN7N5N9N8N5NW12NW12NW12NW10NW8NW8--------------NW3CalmCalmCalmCalmCalm
2 days agoN6N9N9NW9N8NW9NW10NW11NW11NW10NW11NW11N5N5N5N5--N5N8N9N9N9N8N9

Tide / Current Tables for Grant Line Canal (drawbridge), Old River, California
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Grant Line Canal (drawbridge)
Click for Map
Mon -- 06:15 AM PDT     0.07 feet Low Tide
Mon -- 06:53 AM PDT     Sunrise
Mon -- 11:52 AM PDT     Moonrise
Mon -- 12:12 PM PDT     3.18 feet High Tide
Mon -- 05:56 PM PDT     0.65 feet Low Tide
Mon -- 07:03 PM PDT     Sunset
Mon -- 10:10 PM PDT     Moonset
Mon -- 11:44 PM PDT     3.94 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.83.22.51.60.90.30.10.20.71.52.32.93.23.12.61.91.30.80.70.91.52.43.33.8

Tide / Current Tables for Brandt Bridge, San Joaquin River, California Current
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Brandt Bridge
Click for Map
Mon -- 02:58 AM PDT     -1.14 knots Max Ebb
Mon -- 06:52 AM PDT     Sunrise
Mon -- 07:02 AM PDT     0.00 knots Slack
Mon -- 09:31 AM PDT     0.58 knots Max Flood
Mon -- 11:51 AM PDT     Moonrise
Mon -- 12:12 PM PDT     -0.00 knots Slack
Mon -- 03:21 PM PDT     -0.80 knots Max Ebb
Mon -- 06:32 PM PDT     0.01 knots Slack
Mon -- 07:02 PM PDT     Sunset
Mon -- 09:08 PM PDT     0.79 knots Max Flood
Mon -- 10:10 PM PDT     Moonset
Mon -- 11:56 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.4-0.8-1.1-1.1-1.1-0.8-0.5-00.40.60.60.40.1-0.3-0.6-0.8-0.8-0.6-0.20.20.60.80.70.4

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 San Francisco Bay Area, CA
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weather_mapweather_map weather_map


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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.