Wednesday, February20, 2019 L-36.com


Marine Weather and Tides
Atwater, CA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:43AMSunset 5:48PM Wednesday February 20, 2019 1:48 PM PST (21:48 UTC) Moonrise 7:22PMMoonset 7:43AM Illumination 98% Phase: Waning Gibbous; Moon at 16 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- 807 Am Pst Wed Feb 20 2019
.small craft advisory in effect through this evening...
Today..NW winds 15 to 25 kt...becoming 20 to 25 kt this afternoon. Gusts up to 35 kt. Wind waves 3 to 5 ft. W swell around 4 ft at 13 seconds. SWell W up to 1 ft. A chance of showers.
Tonight..N winds 5 to 15 kt. Wind waves around 3 ft. W swell around 4 ft at 13 seconds and S up to 1 ft at 14 seconds. A chance of showers.
Thu..N winds 10 to 20 kt with gusts up to 25 kt. Wind waves around 3 ft. W swell 4 to 5 ft at 17 seconds and S up to 1 ft at 14 seconds.
Thu night..N winds 10 to 20 kt with gusts up to 25 kt. Wind waves around 3 ft. W swell 4 to 6 ft at 15 seconds and S up to 1 ft at 14 seconds.
Fri..W winds 5 to 15 kt. Wind waves around 3 ft. W swell 3 to 5 ft at 15 seconds and S up to 1 ft at 13 seconds.
Fri night..N winds 5 to 15 kt. Wind waves around 3 ft. W swell 3 to 5 ft at 15 seconds and S up to 1 ft at 13 seconds.
Sat..NW winds up to 10 kt. Wind waves 2 ft or less. W swell 3 to 4 ft and S up to 1 ft.
Sun..W winds 5 to 10 kt. Wind waves 2 ft or less. W swell around 3 ft and S up to 1 ft.
PZZ500 807 Am Pst Wed Feb 20 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds are expected to increase today and remain gusty through the rest of the work week. Widespread gale force conditions are forecast across the outer waters starting late tonight and lasting through Thursday. Isolated gale force gusts will also be possible along the coast. Gusty winds will generate steep fresh swell causing hazardous conditions, especially for smaller vessels. Moderate northwest swell will continue through the end of the 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 201153
afdhnx
area forecast discussion
national weather service san joaquin valley - hanford ca
353 am pst Wed feb 20 2019

Synopsis
The next storm system will impact central california
today through Thursday. This storm system will have limited
moisture, with precipitation amounts much less than what fell in
the forecast area this past weekend. This system will also be
slightly colder than the last. Temperatures will remain below
normal for this time of year for at least the next several days.

Discussion
A very interesting forecast scenario is shaping up for the area.

The amount of precipitation is not really notable. But the type of
moisture could be, especially in parts of the san joaquin valley.

Yes, I mean the four lettered word that begins with S and ends
with now. Believe me, I am not trying to get everyone super excited
about the prospect of snow in the valley, such as I am. But, it
is a distinct possibility that needs to be monitored. A polar
airmass is moving southward into the great basin. A low pressure
system progged to bottom out at 529 decameters at the 500 mb
height will be centered just to the east of our CWA by early
Thursday morning. This would be the optimal timing for snow
chances when temperatures are coldest during the night and the
that coupled with some moisture and upward vertical motion with
the pva MAX (area of greatest lift) moving over central
california could result in the formation of very low elevation
showers that are in the frozen variety. Snow levels are amazingly
progged to drop below 1000 feet and even lower on the northeast
side of the southern sjv during this period. Having said all of that,
the expected QPF with this system will be on the low side and if
snow does manage to fall in parts of the valley, accumulations
would be little to none. But, any snow falling in areas that
drivers are not accustomed to seeing this could make for an
increasingly challenging commute. So this does have huge
implications if this were to transpire. At this time it looks as
if the eastern parts of the sjv would have the highest chances to
see some snow showers.

Another interesting characteristic of this system is that the
aforementioned southward moving pva MAX will remain over the
eastern and central parts of the cwa. This will keep the highest
chances of precipitation over the western two thirds of the cwa,
which is a bit different than what we are used to. Usually we
think higher chances of precipitation over the highest elevations,
and the western two thirds of the area sees lower chances. As this
energy moves southward, kern county mountains will see chances
for precipitation increase as early as late afternoon on
Wednesday when snow levels will be right around 3500 feet and drop
through the night to around 2000 feet in the grapevine area on
Thursday morning. That is well below pass level and travel plans
should account for this. At this time, up to 4 inches of snowfall
could fall. It would be highly recommended to either travel before
this happens or after the system passes and roads are cleaned up,
or simply try to use an alternate route which can be iffy with
this system. Road closures would be possible and more to the point
expected with this system.

Weak shortwave ridging will move into the region beginning Friday
morning and a return to a more zonal pattern is expected next
week, but not before a weak system with very little moisture moves
through the area on Sunday. The main areas impacted with this
system will be the higher elevations and snow amounts will be
minimal.

Aviation
Beginning later this morning, areas of mountain obscurations in low
clouds and precipitation in the sierra nevada, foothills, and kern
county mountains. Also MVFR and local ifr conditions in low clouds
and showers across the san joaquin valley are expected through
Wednesday afternoon. Otherwise,VFR conditions can be expected
across the central ca interior for the next 24 hours.

Air quality issues
None.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ELXC1 - Elkhorn Slough Reserve, CA 70 mi63 min NW 12 54°F 1013 hPa43°F
MLSC1 - Moss Landing, South Harbor, CA 73 mi23 min WNW 19 G 58 52°F 1012.7 hPa44°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 mi63 minN 010.00 miMostly Cloudy55°F39°F55%1012.5 hPa
Merced Regional Airport, CA6 mi55 minN 010.00 miMostly Cloudy54°F37°F55%1011.7 hPa

Wind History from MER (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmSE3CalmCalmSE5SE3E4355CalmCalmCalm
1 day ago--NW15NW15NW15NW10W10W10NW10NW9NW8NW7CalmCalmCalmCalmCalmCalmCalmCalmN5N5CalmCalmCalm
2 days ago6N10NW12
G18
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N10N6NW6N3NW4CalmCalmCalmCalmCalmNW5N3CalmCalmCalmNW6N6N6N6N6

Tide / Current Tables for Grant Line Canal (drawbridge), Old River, California
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Grant Line Canal (drawbridge)
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Wed -- 03:01 AM PST     -0.30 feet Low Tide
Wed -- 06:49 AM PST     Sunrise
Wed -- 07:46 AM PST     Moonset
Wed -- 09:07 AM PST     3.61 feet High Tide
Wed -- 02:53 PM PST     0.82 feet Low Tide
Wed -- 05:49 PM PST     Sunset
Wed -- 07:24 PM PST     Moonrise
Wed -- 08:29 PM PST     4.31 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.30.5-0.1-0.3-00.71.72.63.33.63.42.92.11.410.81.11.92.93.84.34.33.83

Tide / Current Tables for Brandt Bridge, San Joaquin River, California Current
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Brandt Bridge
Click for Map
Wed -- 03:44 AM PST     0.00 knots Slack
Wed -- 06:31 AM PST     0.67 knots Max Flood
Wed -- 06:49 AM PST     Sunrise
Wed -- 07:46 AM PST     Moonset
Wed -- 09:17 AM PST     -0.00 knots Slack
Wed -- 12:34 PM PST     -0.74 knots Max Ebb
Wed -- 03:24 PM PST     0.00 knots Slack
Wed -- 05:49 PM PST     Sunset
Wed -- 05:58 PM PST     0.77 knots Max Flood
Wed -- 07:24 PM PST     Moonrise
Wed -- 08:33 PM PST     -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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-1.3-1.2-0.9-0.40.10.50.60.60.50.1-0.3-0.6-0.7-0.7-0.6-0.20.30.60.80.60.3-0.2-0.7-1.1

Weather Map and Satellite Images
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wmap_P
GOES 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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Joaquin Valley/Hanford, CA (16,3,4,5)
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Ground Weather Radar Station San Francisco Bay Area, CA
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Disclaimer:
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 numerious 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.