Friday, April27, 2018 L-36.com


Marine Weather and Tides
Atwater, CA

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.

Sunrise 6:10AMSunset 7:49PM Thursday April 26, 2018 9:29 PM PDT (04:29 UTC) Moonrise 3:35PMMoonset 3:40AM Illumination 90% Phase: Waxing Gibbous; Moon at 12 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- 850 Pm Pdt Thu Apr 26 2018
Tonight..W winds 10 to 20 kt...diminishing to 5 to 15 kt after midnight. Wind waves 2 to 3 ft. W swell 3 to 4 ft at 13 seconds.
Fri..W winds 5 to 15 kt. Wind waves 3 ft or less. W swell around 3 ft at 14 seconds.
Fri night..NW winds 5 to 15 kt. Wind waves 3 ft or less. W swell 3 to 4 ft at 15 seconds.
Sat..W winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 3 to 4 ft at 14 seconds.
Sat night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 2 to 4 ft. W swell 3 to 4 ft at 13 seconds.
Sun..NW winds up to 10 kt. Wind waves 2 ft or less. W swell 3 to 4 ft.
Sun night..NW winds 5 to 15 kt. Wind waves 2 ft or less. W swell 3 to 4 ft.
Mon..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell up to 4 ft.
Tue..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell up to 4 ft.
PZZ500 850 Pm Pdt Thu Apr 26 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Generally light west to northwest winds will prevail across the waters except locally breezy conditions near the coastal gaps and prominent points through Friday afternoon and evening. Light to moderate seas will continue through the forecast period with a mixed south and northwest swell through late 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 262255
afdhnx
area forecast discussion
national weather service san joaquin valley - hanford ca
355 pm pdt Thu apr 26 2018

Synopsis
A chance of afternoon showers and thunderstorms across the sierra
nevada due to an approaching upper level weather disturbance.

Expect cooler and breezy conditions on Friday and into the
weekend, and then another chance for mainly mountain showers and
thunderstorms during early next week.

Discussion
Skies still relatively clear this mid-day as isolated cumulus was
start to develop over the sierra nevada. Based on upper level
dynamics and instability parameters, confidence is still high for
afternoon convection over the sierra nevada. Therefore, will
expect convection to start closer to 3 pm pdt and fire-up until
near sunset this evening. In addition, the marine layer, as seen
on the fort ord wind profiler, has been at around the 2500 foot
msl level with some possible filtering of cooler air into the san
joaquin valley. As of this afternoon, temperatures have been
running cooler by 3 to 5 degrees. While widespread temperatures
this afternoon are likely to reach in the 80s, it is very unlikely
that they will reach the 90 degree mark under a changing air-
mass. Furthermore, surface frontal analysis has a cold front just
off the west coast that is progged to push through california on
Friday, lowering temperatures even further and increasing surface
winds that will last into the weekend.

While models show the bulk of the upper level dynamic lift pushing
mostly into northern california, the southern edge will skirt the
southern sierra nevada and raise the potential for afternoon
convection. In addition to the vort-lobe energy, some difluence
flow along with reasonable CAPE and LI values will tip the scales
toward the possibility of thunderstorms. Therefore, will keep a
mention of mostly isolated convection until sunset. By Friday
afternoon, models show the cold front pushing into eastern
california and shifting the convective potential further eastward.

While the convective threat will become minimal over the
district, the colder air will help tighten the surface pressure
from ksfo to klas as winds over the kern county mountains and
deserts reach wind advisory criteria (gusting to 45 mph). In
addition, the cold front will usher in lower freezing levels as
the yosemite valley could see overnight lows in the upper 30s
during the weekend.

By the end of the weekend models swings piece of vort MAX energy
through central california and maintain a chance of possible
mountain precipitation. Moreover, the northerly flow aloft will
push additional cold air into the region to maintain cooler
temperatures. Afterward, model uncertainty increases, but models
are trending toward the continuation of a cyclonic flow pattern
through early next week. Going into the middle of next week,
models then show a ridge pattern developing with high uncertainty
in its timing. Will opt for the slower ECMWF solution and wait
until the end of the forecast cycle before starting another
warming and drying trend.

Aviation
Isolated showers and thunderstorms along the sierra through 03z
Friday. OtherwiseVFR conditions will prevail across the central ca
interior during 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 mi104 min W 7 54°F 1016 hPa48°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 mi44 minNNW 1210.00 miClear64°F44°F49%1012.5 hPa
Merced Regional Airport, CA6 mi36 minNW 13 G 1710.00 miFair67°F48°F53%1012.2 hPa

Wind History from MER (wind in knots)
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Last 24hr------------------NW10NW10NW10NW10NW10N10N7N12NW11NW6NW6NW6N10N10NW12
1 day ago------------------NW8N4N7NW7N6NW7NW7NW8NW8NW7N7N8N10NW10NW10
2 days ago----------------------NW5N6N6N7N7NW7NW7NW7NW9N10N10N7N10

Tide / Current Tables for Stockton, San Joaquin River, California
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Stockton
Click for Map
Fri -- 05:09 AM PDT     3.94 feet High Tide
Fri -- 05:16 AM PDT     Moonset
Fri -- 06:13 AM PDT     Sunrise
Fri -- 11:58 AM PDT     0.11 feet Low Tide
Fri -- 05:20 PM PDT     3.41 feet High Tide
Fri -- 05:40 PM PDT     Moonrise
Fri -- 07:52 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.10.71.72.73.53.93.83.22.41.60.90.30.10.41.22.233.43.32.92.21.50.80.3

Tide / Current Tables for Brandt Bridge, San Joaquin River, California Current
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Brandt Bridge
Click for Map
Fri -- 01:48 AM PDT     0.01 knots Slack
Fri -- 04:54 AM PDT     0.74 knots Max Flood
Fri -- 05:16 AM PDT     Moonset
Fri -- 06:14 AM PDT     Sunrise
Fri -- 07:28 AM PDT     -0.00 knots Slack
Fri -- 11:14 AM PDT     -1.06 knots Max Ebb
Fri -- 02:27 PM PDT     0.00 knots Slack
Fri -- 05:06 PM PDT     0.64 knots Max Flood
Fri -- 05:41 PM PDT     Moonrise
Fri -- 07:23 PM PDT     -0.00 knots Slack
Fri -- 07:52 PM PDT     Sunset
Fri -- 11:07 PM PDT     -0.99 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.8-0.40.10.50.70.70.60.2-0.2-0.6-0.9-1-1-0.7-0.20.20.50.60.50.2-0.3-0.6-0.9-1

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 (0,6,7,8)
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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.