Sunday, May19, 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 5:48AMSunset 8:08PM Sunday May 19, 2019 3:48 AM PDT (10:48 UTC) Moonrise 8:13PMMoonset 5:39AM Illumination 100% Phase: Full Moon; Moon at 15 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- 212 Am Pdt Sun May 19 2019
.small craft advisory in effect through late tonight...
Today..W winds 15 to 20 kt with gusts up to 25 kt. Wind waves 4 to 5 ft. W swell 5 to 7 ft at 14 seconds...building to 7 to 9 ft at 13 seconds this afternoon. A chance of showers and a slight chance of Thunderstorms.
Tonight..NW winds 5 to 10 kt. Wind waves 2 ft or less. W swell 9 to 11 ft at 13 seconds. Rain likely.
Mon..W winds 15 to 25 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. W swell 7 to 9 ft at 13 seconds.
Mon night..W winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 5 ft. W swell 5 to 7 ft at 12 seconds. A chance of rain.
Tue..W winds 15 to 25 kt with gusts up to 30 kt. Wind waves 6 to 7 ft. W swell 5 to 7 ft at 12 seconds. A chance of rain.
Tue night..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 5 ft. W swell 7 to 9 ft at 14 seconds. A chance of rain.
Wed..NW winds 10 to 20 kt. Wind waves around 3 ft. W swell 7 to 9 ft.
Thu..W winds up to 10 kt. Wind waves 2 ft or less. W swell 5 to 7 ft. Winds and wind waves higher in and near Thunderstorms. Locally lower winds and seas across sheltered portions of the bay.
PZZ500 212 Am Pdt Sun May 19 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A low pressure system will move into the northern california waters early today bringing showers and a slight chance of Thunderstorms into late this morning. Moderate southerly winds will continue to gradually shift out of the west. SWells will build across the waters today creating hazardous conditions, particularly for smaller vessels. West to northwest winds will increase across the waters into Tuesday as another system passes by to the north.


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 182233
afdhnx
area forecast discussion
national weather service san joaquin valley - hanford ca
333 pm pdt Sat may 18 2019

Synopsis
Rain and high elevation snow will be the dominate weather feature
across the district tonight through Sunday afternoon. There is
also the risk of afternoon thunderstorms, some of which could be
strong. Another system will impact the area on Tuesday, but with
low confidence on precipitation amounts and timing. Temperatures
will remain below average through next week.

Discussion
After a cool start for a mid-may morning, current afternoon
temperatures are between 10 to 15 deg f below average with upper
60s to low 70s in the sjv and kern county desert and 50s to low
60s in the foothills and sierra. Peak heating has already occurred
as extensive cloud cover is spreading across the region ahead of
our approaching system. Moist onshore flow ahead of the cold front
is currently bringing light to moderate precipitation into the
bay area and norcal. Precipitation will continue to increase in
intensity and coverage across the district through late afternoon
into the evening as the upper level low continues to approach the
ca coast.

From this evening into Sunday morning, the combination of strong
synoptic scale lift ahead of the 530mb uul and moist pre-frontal
onshore flow will bring light to moderate precipitation across the
district. General QPF amounts of 1 4 to 3 4 inches in the sjv, 1
to 2 inches in the foothills and sierra, and 1 2 to 1 inch into
the kern county mountains. A 1 10 of an inch or less is possible
in the kern county desert. Heavy snowfall will occur in the sierra
with 8 to 12 inches of snow above 6000 feet and up to 20 inches
above 8,000 feet. Snow level by late Sunday may drop to 5500 feet.

A winter storm warning will begin at 5pm pdt today and continue
through 11 pm pdt Sunday for the sierra. Due to the precipitation
and cloud cover, low temperatures tonight will be slightly warmer
compared to this morning with mainly low 50s in the sjv kern
county desert with 40s into the foothills.

Cold front moves through the district on Sunday morning,
with the band of frontal precipitation ending in the early
morning. Similar to this last Thursday, the atmosphere will
quickly destabilize behind the front in the afternoon with the
high-res models showing mean SBCAPE values of 400-800 j kg. In
addition, models show decent upper level difluent flow along with
a 150 kt jet MAX (with the district in the favored left-exit
region) at 250mb moving into the area by Sunday afternoon, which
may enhance convective activity. The main threat from these storms
will be locally heavy rain, strong winds, and possible hail with
the SPC having a general risk of thunderstorms. High temps will
remain some 10 to 15 deg f below normal.

On Monday, the uul exits the region with northwesterly moving
into the area. Models starting to come into agreement in showing
the las-sfo surface pressure gradient increasing to around 12mb.

As such, following shifts will need to monitor for possible strong
winds in the kern county mountains and desert. By Tuesday onward,
models show a deep upper level trough digging into the western
us. However, there is still considerable disagreement into the
strength and position of the surface low and subsequent
precipitation. Thus I have low confidence in amounts and timing of
precipitation. However, long range models and ensembles have some
general agreement showing a deep ull in the western us, thus i
have a bit more confidence in below average temperatures though
next Friday.

Aviation
A storm system will spread precipitation southward over the central
california interior through this evening and overnight. This will
bring widespread ifr conditions and local terrain obscurations over
the sierra by 03z Sunday and into the kern county mountains by 06z
Sunday. Heavier showers can also produce local ifr conditions in the
san joaquin valley and foothills. Isolated thunderstorms will be
possible across the region after 18z Sunday.

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 low.

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 S 5.1 52°F 1009 hPa51°F
MLSC1 - Moss Landing, South Harbor, CA 73 mi31 min W 12 G 32 54°F 1009 hPa52°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 mi73 minSE 910.00 miMostly Cloudy54°F53°F100%1008.5 hPa
Merced Regional Airport, CA6 mi55 minSE 12 G 1910.00 miOvercast52°F51°F97%1008.2 hPa

Wind History from MER (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalm6S8SW9--SW9--CalmCalmE6E17
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1 day agoCalmS4Calm--CalmCalmCalmNW10------W11
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2 days agoW6N3NE6CalmCalmCalm------W18W15W15
G22
--N9E7CalmNE3--S4CalmCalmS3CalmCalm

Tide / Current Tables for Grant Line Canal (drawbridge), Old River, California
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Grant Line Canal (drawbridge)
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Sun -- 02:52 AM PDT     0.84 feet Low Tide
Sun -- 05:52 AM PDT     Sunrise
Sun -- 06:41 AM PDT     Moonset
Sun -- 08:36 AM PDT     4.05 feet High Tide
Sun -- 04:14 PM PDT     -0.47 feet Low Tide
Sun -- 08:12 PM PDT     Sunset
Sun -- 09:17 PM PDT     Moonrise
Sun -- 10:18 PM PDT     3.05 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.91.310.81.11.82.73.5443.732.11.20.4-0.2-0.5-0.30.31.122.732.9

Tide / Current Tables for Brandt Bridge, San Joaquin River, California Current
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Brandt Bridge
Click for Map
Sun -- 12:31 AM PDT     -0.66 knots Max Ebb
Sun -- 03:21 AM PDT     0.00 knots Slack
Sun -- 05:52 AM PDT     Sunrise
Sun -- 05:56 AM PDT     0.75 knots Max Flood
Sun -- 06:40 AM PDT     Moonset
Sun -- 08:40 AM PDT     -0.00 knots Slack
Sun -- 01:06 PM PDT     -1.23 knots Max Ebb
Sun -- 05:03 PM PDT     0.01 knots Slack
Sun -- 07:52 PM PDT     0.60 knots Max Flood
Sun -- 08:11 PM PDT     Sunset
Sun -- 09:17 PM PDT     Moonrise
Sun -- 10:23 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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-0.6-0.6-0.5-0.20.30.60.70.60.3-0.2-0.6-1-1.2-1.2-1.2-0.9-0.5-00.30.50.60.50.1-0.2

Weather Map and Satellite Images
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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 (6,6,7,8)
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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.